android studio 创建的初始工程。

.gitignore

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+*.iml
+.gradle
+/local.properties
+/.idea/caches
+/.idea/libraries
+/.idea/modules.xml
+/.idea/workspace.xml
+/.idea/navEditor.xml
+/.idea/assetWizardSettings.xml
+.DS_Store
+/build
+/captures
+.externalNativeBuild
+.cxx
+local.properties

.idea/.gitignore

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+# Default ignored files
+/shelf/
+/workspace.xml

.idea/.name

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+Sample

.idea/AndroidProjectSystem.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="AndroidProjectSystem">
+    <option name="providerId" value="com.android.tools.idea.GradleProjectSystem" />
+  </component>
+</project>

.idea/compiler.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="CompilerConfiguration">
+    <bytecodeTargetLevel target="21" />
+  </component>
+</project>

.idea/deploymentTargetSelector.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="deploymentTargetSelector">
+    <selectionStates>
+      <SelectionState runConfigName="app">
+        <option name="selectionMode" value="DROPDOWN" />
+      </SelectionState>
+    </selectionStates>
+  </component>
+</project>

.idea/gradle.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="GradleSettings">
+    <option name="linkedExternalProjectsSettings">
+      <GradleProjectSettings>
+        <option name="testRunner" value="CHOOSE_PER_TEST" />
+        <option name="externalProjectPath" value="$PROJECT_DIR$" />
+        <option name="gradleJvm" value="#GRADLE_LOCAL_JAVA_HOME" />
+        <option name="modules">
+          <set>
+            <option value="$PROJECT_DIR$" />
+            <option value="$PROJECT_DIR$/app" />
+          </set>
+        </option>
+      </GradleProjectSettings>
+    </option>
+  </component>
+</project>

.idea/migrations.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectMigrations">
+    <option name="MigrateToGradleLocalJavaHome">
+      <set>
+        <option value="$PROJECT_DIR$" />
+      </set>
+    </option>
+  </component>
+</project>

.idea/misc.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ExternalStorageConfigurationManager" enabled="true" />
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_21" default="true" project-jdk-name="jbr-21" project-jdk-type="JavaSDK">
+    <output url="file://$PROJECT_DIR$/build/classes" />
+  </component>
+  <component name="ProjectType">
+    <option name="id" value="Android" />
+  </component>
+</project>

.idea/runConfigurations.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="RunConfigurationProducerService">
+    <option name="ignoredProducers">
+      <set>
+        <option value="com.intellij.execution.junit.AbstractAllInDirectoryConfigurationProducer" />
+        <option value="com.intellij.execution.junit.AllInPackageConfigurationProducer" />
+        <option value="com.intellij.execution.junit.PatternConfigurationProducer" />
+        <option value="com.intellij.execution.junit.TestInClassConfigurationProducer" />
+        <option value="com.intellij.execution.junit.UniqueIdConfigurationProducer" />
+        <option value="com.intellij.execution.junit.testDiscovery.JUnitTestDiscoveryConfigurationProducer" />
+        <option value="org.jetbrains.kotlin.idea.junit.KotlinJUnitRunConfigurationProducer" />
+        <option value="org.jetbrains.kotlin.idea.junit.KotlinPatternConfigurationProducer" />
+      </set>
+    </option>
+  </component>
+</project>

app/.gitignore

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+/build

app/build.gradle

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+plugins {
+    alias(libs.plugins.android.application)
+}
+
+android {
+    namespace 'com.hmwl.sample'
+    compileSdk 35
+
+    defaultConfig {
+        applicationId "com.hmwl.sample"
+        minSdk 28
+        targetSdk 35
+        versionCode 1
+        versionName "1.0"
+
+        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
+    }
+
+    buildTypes {
+        debug {
+            debuggable true
+            jniDebuggable true
+        }
+
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
+        }
+    }
+    compileOptions {
+        sourceCompatibility JavaVersion.VERSION_21
+        targetCompatibility JavaVersion.VERSION_21
+    }
+    buildFeatures {
+        prefab true
+    }
+    externalNativeBuild {
+        cmake {
+            path file('src/main/cpp/CMakeLists.txt')
+            version '3.22.1'
+        }
+    }
+}
+
+dependencies {
+
+    implementation libs.appcompat
+    implementation libs.material
+    implementation libs.games.activity
+    testImplementation libs.junit
+    androidTestImplementation libs.ext.junit
+    androidTestImplementation libs.espresso.core
+}

app/proguard-rules.pro

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+# Add project specific ProGuard rules here.
+# You can control the set of applied configuration files using the
+# proguardFiles setting in build.gradle.
+#
+# For more details, see
+#   http://developer.android.com/guide/developing/tools/proguard.html
+
+# If your project uses WebView with JS, uncomment the following
+# and specify the fully qualified class name to the JavaScript interface
+# class:
+#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
+#   public *;
+#}
+
+# Uncomment this to preserve the line number information for
+# debugging stack traces.
+#-keepattributes SourceFile,LineNumberTable
+
+# If you keep the line number information, uncomment this to
+# hide the original source file name.
+#-renamesourcefileattribute SourceFile

app/src/androidTest/java/com/hmwl/sample/ExampleInstrumentedTest.java

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+package com.hmwl.sample;
+
+import android.content.Context;
+
+import androidx.test.platform.app.InstrumentationRegistry;
+import androidx.test.ext.junit.runners.AndroidJUnit4;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+import static org.junit.Assert.*;
+
+/**
+ * Instrumented test, which will execute on an Android device.
+ *
+ * @see <a href="http://d.android.com/tools/testing">Testing documentation</a>
+ */
+@RunWith(AndroidJUnit4.class)
+public class ExampleInstrumentedTest {
+    @Test
+    public void useAppContext() {
+        // Context of the app under test.
+        Context appContext = InstrumentationRegistry.getInstrumentation().getTargetContext();
+        assertEquals("com.hmwl.sample", appContext.getPackageName());
+    }
+}

app/src/main/AndroidManifest.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools">
+
+    <application
+        android:allowBackup="true"
+        android:dataExtractionRules="@xml/data_extraction_rules"
+        android:fullBackupContent="@xml/backup_rules"
+        android:icon="@mipmap/ic_launcher"
+        android:label="@string/app_name"
+        android:roundIcon="@mipmap/ic_launcher_round"
+        android:supportsRtl="true"
+        android:theme="@style/Theme.Sample">
+        <activity
+            android:name=".MainActivity"
+            android:exported="true">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+
+            <meta-data
+                android:name="android.app.lib_name"
+                android:value="sample" />
+        </activity>
+    </application>
+
+</manifest>

app/src/main/cpp/AndroidOut.cpp

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+#include "AndroidOut.h"
+
+AndroidOut androidOut("AO");
+std::ostream aout(&androidOut);

app/src/main/cpp/AndroidOut.h

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+#ifndef ANDROIDGLINVESTIGATIONS_ANDROIDOUT_H
+#define ANDROIDGLINVESTIGATIONS_ANDROIDOUT_H
+
+#include <android/log.h>
+#include <sstream>
+
+/*!
+ * Use this to log strings out to logcat. Note that you should use std::endl to commit the line
+ *
+ * ex:
+ *  aout << "Hello World" << std::endl;
+ */
+extern std::ostream aout;
+
+/*!
+ * Use this class to create an output stream that writes to logcat. By default, a global one is
+ * defined as @a aout
+ */
+class AndroidOut: public std::stringbuf {
+public:
+    /*!
+     * Creates a new output stream for logcat
+     * @param kLogTag the log tag to output
+     */
+    inline AndroidOut(const char* kLogTag) : logTag_(kLogTag){}
+
+protected:
+    virtual int sync() override {
+        __android_log_print(ANDROID_LOG_DEBUG, logTag_, "%s", str().c_str());
+        str("");
+        return 0;
+    }
+
+private:
+    const char* logTag_;
+};
+
+#endif //ANDROIDGLINVESTIGATIONS_ANDROIDOUT_H

app/src/main/cpp/CMakeLists.txt

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+# For more information about using CMake with Android Studio, read the
+# documentation: https://d.android.com/studio/projects/add-native-code.html
+
+cmake_minimum_required(VERSION 3.22.1)
+
+project("sample")
+
+# Creates your game shared library. The name must be the same as the
+# one used for loading in your Kotlin/Java or AndroidManifest.txt files.
+add_library(sample SHARED
+        main.cpp
+        AndroidOut.cpp
+        Renderer.cpp
+        Shader.cpp
+        TextureAsset.cpp
+        Utility.cpp)
+
+# Searches for a package provided by the game activity dependency
+find_package(game-activity REQUIRED CONFIG)
+
+# Forces the linker to keep the JNI entry point for GameActivity
+set(CMAKE_SHARED_LINKER_FLAGS
+        "${CMAKE_SHARED_LINKER_FLAGS} -u Java_com_google_androidgamesdk_GameActivity_initializeNativeCode")
+
+# Configure libraries CMake uses to link your target library.
+target_link_libraries(sample
+        # The game activity
+        game-activity::game-activity_static
+
+        # EGL and other dependent libraries required for drawing
+        # and interacting with Android system
+        EGL
+        GLESv3
+        jnigraphics
+        android
+        log)

app/src/main/cpp/Model.h

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+#ifndef ANDROIDGLINVESTIGATIONS_MODEL_H
+#define ANDROIDGLINVESTIGATIONS_MODEL_H
+
+#include <vector>
+#include "TextureAsset.h"
+
+union Vector3 {
+    struct {
+        float x, y, z;
+    };
+    float idx[3];
+};
+
+union Vector2 {
+    struct {
+        float x, y;
+    };
+    struct {
+        float u, v;
+    };
+    float idx[2];
+};
+
+struct Vertex {
+    constexpr Vertex(const Vector3 &inPosition, const Vector2 &inUV) : position(inPosition),
+                                                                       uv(inUV) {}
+
+    Vector3 position;
+    Vector2 uv;
+};
+
+typedef uint16_t Index;
+
+class Model {
+public:
+    inline Model(
+            std::vector<Vertex> vertices,
+            std::vector<Index> indices,
+            std::shared_ptr<TextureAsset> spTexture)
+            : vertices_(std::move(vertices)),
+              indices_(std::move(indices)),
+              spTexture_(std::move(spTexture)) {}
+
+    inline const Vertex *getVertexData() const {
+        return vertices_.data();
+    }
+
+    inline const size_t getIndexCount() const {
+        return indices_.size();
+    }
+
+    inline const Index *getIndexData() const {
+        return indices_.data();
+    }
+
+    inline const TextureAsset &getTexture() const {
+        return *spTexture_;
+    }
+
+private:
+    std::vector<Vertex> vertices_;
+    std::vector<Index> indices_;
+    std::shared_ptr<TextureAsset> spTexture_;
+};
+
+#endif //ANDROIDGLINVESTIGATIONS_MODEL_H

app/src/main/cpp/Renderer.cpp

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+#include "Renderer.h"
+
+#include <game-activity/native_app_glue/android_native_app_glue.h>
+#include <GLES3/gl3.h>
+#include <memory>
+#include <vector>
+#include <android/imagedecoder.h>
+
+#include "AndroidOut.h"
+#include "Shader.h"
+#include "Utility.h"
+#include "TextureAsset.h"
+
+//! executes glGetString and outputs the result to logcat
+#define PRINT_GL_STRING(s) {aout << #s": "<< glGetString(s) << std::endl;}
+
+/*!
+ * @brief if glGetString returns a space separated list of elements, prints each one on a new line
+ *
+ * This works by creating an istringstream of the input c-style string. Then that is used to create
+ * a vector -- each element of the vector is a new element in the input string. Finally a foreach
+ * loop consumes this and outputs it to logcat using @a aout
+ */
+#define PRINT_GL_STRING_AS_LIST(s) { \
+std::istringstream extensionStream((const char *) glGetString(s));\
+std::vector<std::string> extensionList(\
+        std::istream_iterator<std::string>{extensionStream},\
+        std::istream_iterator<std::string>());\
+aout << #s":\n";\
+for (auto& extension: extensionList) {\
+    aout << extension << "\n";\
+}\
+aout << std::endl;\
+}
+
+//! Color for cornflower blue. Can be sent directly to glClearColor
+#define CORNFLOWER_BLUE 100 / 255.f, 149 / 255.f, 237 / 255.f, 1
+
+// Vertex shader, you'd typically load this from assets
+static const char *vertex = R"vertex(#version 300 es
+in vec3 inPosition;
+in vec2 inUV;
+
+out vec2 fragUV;
+
+uniform mat4 uProjection;
+
+void main() {
+    fragUV = inUV;
+    gl_Position = uProjection * vec4(inPosition, 1.0);
+}
+)vertex";
+
+// Fragment shader, you'd typically load this from assets
+static const char *fragment = R"fragment(#version 300 es
+precision mediump float;
+
+in vec2 fragUV;
+
+uniform sampler2D uTexture;
+
+out vec4 outColor;
+
+void main() {
+    outColor = texture(uTexture, fragUV);
+}
+)fragment";
+
+/*!
+ * Half the height of the projection matrix. This gives you a renderable area of height 4 ranging
+ * from -2 to 2
+ */
+static constexpr float kProjectionHalfHeight = 2.f;
+
+/*!
+ * The near plane distance for the projection matrix. Since this is an orthographic projection
+ * matrix, it's convenient to have negative values for sorting (and avoiding z-fighting at 0).
+ */
+static constexpr float kProjectionNearPlane = -1.f;
+
+/*!
+ * The far plane distance for the projection matrix. Since this is an orthographic porjection
+ * matrix, it's convenient to have the far plane equidistant from 0 as the near plane.
+ */
+static constexpr float kProjectionFarPlane = 1.f;
+
+Renderer::~Renderer() {
+    if (display_ != EGL_NO_DISPLAY) {
+        eglMakeCurrent(display_, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT);
+        if (context_ != EGL_NO_CONTEXT) {
+            eglDestroyContext(display_, context_);
+            context_ = EGL_NO_CONTEXT;
+        }
+        if (surface_ != EGL_NO_SURFACE) {
+            eglDestroySurface(display_, surface_);
+            surface_ = EGL_NO_SURFACE;
+        }
+        eglTerminate(display_);
+        display_ = EGL_NO_DISPLAY;
+    }
+}
+
+void Renderer::render() {
+    // Check to see if the surface has changed size. This is _necessary_ to do every frame when
+    // using immersive mode as you'll get no other notification that your renderable area has
+    // changed.
+    updateRenderArea();
+
+    // When the renderable area changes, the projection matrix has to also be updated. This is true
+    // even if you change from the sample orthographic projection matrix as your aspect ratio has
+    // likely changed.
+    if (shaderNeedsNewProjectionMatrix_) {
+        // a placeholder projection matrix allocated on the stack. Column-major memory layout
+        float projectionMatrix[16] = {0};
+
+        // build an orthographic projection matrix for 2d rendering
+        Utility::buildOrthographicMatrix(
+                projectionMatrix,
+                kProjectionHalfHeight,
+                float(width_) / height_,
+                kProjectionNearPlane,
+                kProjectionFarPlane);
+
+        // send the matrix to the shader
+        // Note: the shader must be active for this to work. Since we only have one shader for this
+        // demo, we can assume that it's active.
+        shader_->setProjectionMatrix(projectionMatrix);
+
+        // make sure the matrix isn't generated every frame
+        shaderNeedsNewProjectionMatrix_ = false;
+    }
+
+    // clear the color buffer
+    glClear(GL_COLOR_BUFFER_BIT);
+
+    // Render all the models. There's no depth testing in this sample so they're accepted in the
+    // order provided. But the sample EGL setup requests a 24 bit depth buffer so you could
+    // configure it at the end of initRenderer
+    if (!models_.empty()) {
+        for (const auto &model: models_) {
+            shader_->drawModel(model);
+        }
+    }
+
+    // Present the rendered image. This is an implicit glFlush.
+    auto swapResult = eglSwapBuffers(display_, surface_);
+    assert(swapResult == EGL_TRUE);
+}
+
+void Renderer::initRenderer() {
+    // Choose your render attributes
+    constexpr EGLint attribs[] = {
+            EGL_RENDERABLE_TYPE, EGL_OPENGL_ES3_BIT,
+            EGL_SURFACE_TYPE, EGL_WINDOW_BIT,
+            EGL_BLUE_SIZE, 8,
+            EGL_GREEN_SIZE, 8,
+            EGL_RED_SIZE, 8,
+            EGL_DEPTH_SIZE, 24,
+            EGL_NONE
+    };
+
+    // The default display is probably what you want on Android
+    auto display = eglGetDisplay(EGL_DEFAULT_DISPLAY);
+    eglInitialize(display, nullptr, nullptr);
+
+    // figure out how many configs there are
+    EGLint numConfigs;
+    eglChooseConfig(display, attribs, nullptr, 0, &numConfigs);
+
+    // get the list of configurations
+    std::unique_ptr<EGLConfig[]> supportedConfigs(new EGLConfig[numConfigs]);
+    eglChooseConfig(display, attribs, supportedConfigs.get(), numConfigs, &numConfigs);
+
+    // Find a config we like.
+    // Could likely just grab the first if we don't care about anything else in the config.
+    // Otherwise hook in your own heuristic
+    auto config = *std::find_if(
+            supportedConfigs.get(),
+            supportedConfigs.get() + numConfigs,
+            [&display](const EGLConfig &config) {
+                EGLint red, green, blue, depth;
+                if (eglGetConfigAttrib(display, config, EGL_RED_SIZE, &red)
+                    && eglGetConfigAttrib(display, config, EGL_GREEN_SIZE, &green)
+                    && eglGetConfigAttrib(display, config, EGL_BLUE_SIZE, &blue)
+                    && eglGetConfigAttrib(display, config, EGL_DEPTH_SIZE, &depth)) {
+
+                    aout << "Found config with " << red << ", " << green << ", " << blue << ", "
+                         << depth << std::endl;
+                    return red == 8 && green == 8 && blue == 8 && depth == 24;
+                }
+                return false;
+            });
+
+    aout << "Found " << numConfigs << " configs" << std::endl;
+    aout << "Chose " << config << std::endl;
+
+    // create the proper window surface
+    EGLint format;
+    eglGetConfigAttrib(display, config, EGL_NATIVE_VISUAL_ID, &format);
+    EGLSurface surface = eglCreateWindowSurface(display, config, app_->window, nullptr);
+
+    // Create a GLES 3 context
+    EGLint contextAttribs[] = {EGL_CONTEXT_CLIENT_VERSION, 3, EGL_NONE};
+    EGLContext context = eglCreateContext(display, config, nullptr, contextAttribs);
+
+    // get some window metrics
+    auto madeCurrent = eglMakeCurrent(display, surface, surface, context);
+    assert(madeCurrent);
+
+    display_ = display;
+    surface_ = surface;
+    context_ = context;
+
+    // make width and height invalid so it gets updated the first frame in @a updateRenderArea()
+    width_ = -1;
+    height_ = -1;
+
+    PRINT_GL_STRING(GL_VENDOR);
+    PRINT_GL_STRING(GL_RENDERER);
+    PRINT_GL_STRING(GL_VERSION);
+    PRINT_GL_STRING_AS_LIST(GL_EXTENSIONS);
+
+    shader_ = std::unique_ptr<Shader>(
+            Shader::loadShader(vertex, fragment, "inPosition", "inUV", "uProjection"));
+    assert(shader_);
+
+    // Note: there's only one shader in this demo, so I'll activate it here. For a more complex game
+    // you'll want to track the active shader and activate/deactivate it as necessary
+    shader_->activate();
+
+    // setup any other gl related global states
+    glClearColor(CORNFLOWER_BLUE);
+
+    // enable alpha globally for now, you probably don't want to do this in a game
+    glEnable(GL_BLEND);
+    glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+
+    // get some demo models into memory
+    createModels();
+}
+
+void Renderer::updateRenderArea() {
+    EGLint width;
+    eglQuerySurface(display_, surface_, EGL_WIDTH, &width);
+
+    EGLint height;
+    eglQuerySurface(display_, surface_, EGL_HEIGHT, &height);
+
+    if (width != width_ || height != height_) {
+        width_ = width;
+        height_ = height;
+        glViewport(0, 0, width, height);
+
+        // make sure that we lazily recreate the projection matrix before we render
+        shaderNeedsNewProjectionMatrix_ = true;
+    }
+}
+
+/**
+ * @brief Create any demo models we want for this demo.
+ */
+void Renderer::createModels() {
+    /*
+     * This is a square:
+     * 0 --- 1
+     * | \   |
+     * |  \  |
+     * |   \ |
+     * 3 --- 2
+     */
+    std::vector<Vertex> vertices = {
+            Vertex(Vector3{1, 1, 0}, Vector2{0, 0}), // 0
+            Vertex(Vector3{-1, 1, 0}, Vector2{1, 0}), // 1
+            Vertex(Vector3{-1, -1, 0}, Vector2{1, 1}), // 2
+            Vertex(Vector3{1, -1, 0}, Vector2{0, 1}) // 3
+    };
+    std::vector<Index> indices = {
+            0, 1, 2, 0, 2, 3
+    };
+
+    // loads an image and assigns it to the square.
+    //
+    // Note: there is no texture management in this sample, so if you reuse an image be careful not
+    // to load it repeatedly. Since you get a shared_ptr you can safely reuse it in many models.
+    auto assetManager = app_->activity->assetManager;
+    auto spAndroidRobotTexture = TextureAsset::loadAsset(assetManager, "android_robot.png");
+
+    // Create a model and put it in the back of the render list.
+    models_.emplace_back(vertices, indices, spAndroidRobotTexture);
+}
+
+void Renderer::handleInput() {
+    // handle all queued inputs
+    auto *inputBuffer = android_app_swap_input_buffers(app_);
+    if (!inputBuffer) {
+        // no inputs yet.
+        return;
+    }
+
+    // handle motion events (motionEventsCounts can be 0).
+    for (auto i = 0; i < inputBuffer->motionEventsCount; i++) {
+        auto &motionEvent = inputBuffer->motionEvents[i];
+        auto action = motionEvent.action;
+
+        // Find the pointer index, mask and bitshift to turn it into a readable value.
+        auto pointerIndex = (action & AMOTION_EVENT_ACTION_POINTER_INDEX_MASK)
+                >> AMOTION_EVENT_ACTION_POINTER_INDEX_SHIFT;
+        aout << "Pointer(s): ";
+
+        // get the x and y position of this event if it is not ACTION_MOVE.
+        auto &pointer = motionEvent.pointers[pointerIndex];
+        auto x = GameActivityPointerAxes_getX(&pointer);
+        auto y = GameActivityPointerAxes_getY(&pointer);
+
+        // determine the action type and process the event accordingly.
+        switch (action & AMOTION_EVENT_ACTION_MASK) {
+            case AMOTION_EVENT_ACTION_DOWN:
+            case AMOTION_EVENT_ACTION_POINTER_DOWN:
+                aout << "(" << pointer.id << ", " << x << ", " << y << ") "
+                     << "Pointer Down";
+                break;
+
+            case AMOTION_EVENT_ACTION_CANCEL:
+                // treat the CANCEL as an UP event: doing nothing in the app, except
+                // removing the pointer from the cache if pointers are locally saved.
+                // code pass through on purpose.
+            case AMOTION_EVENT_ACTION_UP:
+            case AMOTION_EVENT_ACTION_POINTER_UP:
+                aout << "(" << pointer.id << ", " << x << ", " << y << ") "
+                     << "Pointer Up";
+                break;
+
+            case AMOTION_EVENT_ACTION_MOVE:
+                // There is no pointer index for ACTION_MOVE, only a snapshot of
+                // all active pointers; app needs to cache previous active pointers
+                // to figure out which ones are actually moved.
+                for (auto index = 0; index < motionEvent.pointerCount; index++) {
+                    pointer = motionEvent.pointers[index];
+                    x = GameActivityPointerAxes_getX(&pointer);
+                    y = GameActivityPointerAxes_getY(&pointer);
+                    aout << "(" << pointer.id << ", " << x << ", " << y << ")";
+
+                    if (index != (motionEvent.pointerCount - 1)) aout << ",";
+                    aout << " ";
+                }
+                aout << "Pointer Move";
+                break;
+            default:
+                aout << "Unknown MotionEvent Action: " << action;
+        }
+        aout << std::endl;
+    }
+    // clear the motion input count in this buffer for main thread to re-use.
+    android_app_clear_motion_events(inputBuffer);
+
+    // handle input key events.
+    for (auto i = 0; i < inputBuffer->keyEventsCount; i++) {
+        auto &keyEvent = inputBuffer->keyEvents[i];
+        aout << "Key: " << keyEvent.keyCode <<" ";
+        switch (keyEvent.action) {
+            case AKEY_EVENT_ACTION_DOWN:
+                aout << "Key Down";
+                break;
+            case AKEY_EVENT_ACTION_UP:
+                aout << "Key Up";
+                break;
+            case AKEY_EVENT_ACTION_MULTIPLE:
+                // Deprecated since Android API level 29.
+                aout << "Multiple Key Actions";
+                break;
+            default:
+                aout << "Unknown KeyEvent Action: " << keyEvent.action;
+        }
+        aout << std::endl;
+    }
+    // clear the key input count too.
+    android_app_clear_key_events(inputBuffer);
+}

app/src/main/cpp/Renderer.h

@@ -0,0 +1,74 @@
+#ifndef ANDROIDGLINVESTIGATIONS_RENDERER_H
+#define ANDROIDGLINVESTIGATIONS_RENDERER_H
+
+#include <EGL/egl.h>
+#include <memory>
+
+#include "Model.h"
+#include "Shader.h"
+
+struct android_app;
+
+class Renderer {
+public:
+    /*!
+     * @param pApp the android_app this Renderer belongs to, needed to configure GL
+     */
+    inline Renderer(android_app *pApp) :
+            app_(pApp),
+            display_(EGL_NO_DISPLAY),
+            surface_(EGL_NO_SURFACE),
+            context_(EGL_NO_CONTEXT),
+            width_(0),
+            height_(0),
+            shaderNeedsNewProjectionMatrix_(true) {
+        initRenderer();
+    }
+
+    virtual ~Renderer();
+
+    /*!
+     * Handles input from the android_app.
+     *
+     * Note: this will clear the input queue
+     */
+    void handleInput();
+
+    /*!
+     * Renders all the models in the renderer
+     */
+    void render();
+
+private:
+    /*!
+     * Performs necessary OpenGL initialization. Customize this if you want to change your EGL
+     * context or application-wide settings.
+     */
+    void initRenderer();
+
+    /*!
+     * @brief we have to check every frame to see if the framebuffer has changed in size. If it has,
+     * update the viewport accordingly
+     */
+    void updateRenderArea();
+
+    /*!
+     * Creates the models for this sample. You'd likely load a scene configuration from a file or
+     * use some other setup logic in your full game.
+     */
+    void createModels();
+
+    android_app *app_;
+    EGLDisplay display_;
+    EGLSurface surface_;
+    EGLContext context_;
+    EGLint width_;
+    EGLint height_;
+
+    bool shaderNeedsNewProjectionMatrix_;
+
+    std::unique_ptr<Shader> shader_;
+    std::vector<Model> models_;
+};
+
+#endif //ANDROIDGLINVESTIGATIONS_RENDERER_H

app/src/main/cpp/Shader.cpp

@@ -0,0 +1,154 @@
+#include "Shader.h"
+
+#include "AndroidOut.h"
+#include "Model.h"
+#include "Utility.h"
+
+Shader *Shader::loadShader(
+        const std::string &vertexSource,
+        const std::string &fragmentSource,
+        const std::string &positionAttributeName,
+        const std::string &uvAttributeName,
+        const std::string &projectionMatrixUniformName) {
+    Shader *shader = nullptr;
+
+    GLuint vertexShader = loadShader(GL_VERTEX_SHADER, vertexSource);
+    if (!vertexShader) {
+        return nullptr;
+    }
+
+    GLuint fragmentShader = loadShader(GL_FRAGMENT_SHADER, fragmentSource);
+    if (!fragmentShader) {
+        glDeleteShader(vertexShader);
+        return nullptr;
+    }
+
+    GLuint program = glCreateProgram();
+    if (program) {
+        glAttachShader(program, vertexShader);
+        glAttachShader(program, fragmentShader);
+
+        glLinkProgram(program);
+        GLint linkStatus = GL_FALSE;
+        glGetProgramiv(program, GL_LINK_STATUS, &linkStatus);
+        if (linkStatus != GL_TRUE) {
+            GLint logLength = 0;
+            glGetProgramiv(program, GL_INFO_LOG_LENGTH, &logLength);
+
+            // If we fail to link the shader program, log the result for debugging
+            if (logLength) {
+                GLchar *log = new GLchar[logLength];
+                glGetProgramInfoLog(program, logLength, nullptr, log);
+                aout << "Failed to link program with:\n" << log << std::endl;
+                delete[] log;
+            }
+
+            glDeleteProgram(program);
+        } else {
+            // Get the attribute and uniform locations by name. You may also choose to hardcode
+            // indices with layout= in your shader, but it is not done in this sample
+            GLint positionAttribute = glGetAttribLocation(program, positionAttributeName.c_str());
+            GLint uvAttribute = glGetAttribLocation(program, uvAttributeName.c_str());
+            GLint projectionMatrixUniform = glGetUniformLocation(
+                    program,
+                    projectionMatrixUniformName.c_str());
+
+            // Only create a new shader if all the attributes are found.
+            if (positionAttribute != -1
+                && uvAttribute != -1
+                && projectionMatrixUniform != -1) {
+
+                shader = new Shader(
+                        program,
+                        positionAttribute,
+                        uvAttribute,
+                        projectionMatrixUniform);
+            } else {
+                glDeleteProgram(program);
+            }
+        }
+    }
+
+    // The shaders are no longer needed once the program is linked. Release their memory.
+    glDeleteShader(vertexShader);
+    glDeleteShader(fragmentShader);
+
+    return shader;
+}
+
+GLuint Shader::loadShader(GLenum shaderType, const std::string &shaderSource) {
+    Utility::assertGlError();
+    GLuint shader = glCreateShader(shaderType);
+    if (shader) {
+        auto *shaderRawString = (GLchar *) shaderSource.c_str();
+        GLint shaderLength = shaderSource.length();
+        glShaderSource(shader, 1, &shaderRawString, &shaderLength);
+        glCompileShader(shader);
+
+        GLint shaderCompiled = 0;
+        glGetShaderiv(shader, GL_COMPILE_STATUS, &shaderCompiled);
+
+        // If the shader doesn't compile, log the result to the terminal for debugging
+        if (!shaderCompiled) {
+            GLint infoLength = 0;
+            glGetShaderiv(shader, GL_INFO_LOG_LENGTH, &infoLength);
+
+            if (infoLength) {
+                auto *infoLog = new GLchar[infoLength];
+                glGetShaderInfoLog(shader, infoLength, nullptr, infoLog);
+                aout << "Failed to compile with:\n" << infoLog << std::endl;
+                delete[] infoLog;
+            }
+
+            glDeleteShader(shader);
+            shader = 0;
+        }
+    }
+    return shader;
+}
+
+void Shader::activate() const {
+    glUseProgram(program_);
+}
+
+void Shader::deactivate() const {
+    glUseProgram(0);
+}
+
+void Shader::drawModel(const Model &model) const {
+    // The position attribute is 3 floats
+    glVertexAttribPointer(
+            position_, // attrib
+            3, // elements
+            GL_FLOAT, // of type float
+            GL_FALSE, // don't normalize
+            sizeof(Vertex), // stride is Vertex bytes
+            model.getVertexData() // pull from the start of the vertex data
+    );
+    glEnableVertexAttribArray(position_);
+
+    // The uv attribute is 2 floats
+    glVertexAttribPointer(
+            uv_, // attrib
+            2, // elements
+            GL_FLOAT, // of type float
+            GL_FALSE, // don't normalize
+            sizeof(Vertex), // stride is Vertex bytes
+            ((uint8_t *) model.getVertexData()) + sizeof(Vector3) // offset Vector3 from the start
+    );
+    glEnableVertexAttribArray(uv_);
+
+    // Setup the texture
+    glActiveTexture(GL_TEXTURE0);
+    glBindTexture(GL_TEXTURE_2D, model.getTexture().getTextureID());
+
+    // Draw as indexed triangles
+    glDrawElements(GL_TRIANGLES, model.getIndexCount(), GL_UNSIGNED_SHORT, model.getIndexData());
+
+    glDisableVertexAttribArray(uv_);
+    glDisableVertexAttribArray(position_);
+}
+
+void Shader::setProjectionMatrix(float *projectionMatrix) const {
+    glUniformMatrix4fv(projectionMatrix_, 1, false, projectionMatrix);
+}

app/src/main/cpp/Shader.h

@@ -0,0 +1,98 @@
+#ifndef ANDROIDGLINVESTIGATIONS_SHADER_H
+#define ANDROIDGLINVESTIGATIONS_SHADER_H
+
+#include <string>
+#include <GLES3/gl3.h>
+
+class Model;
+
+/*!
+ * A class representing a simple shader program. It consists of vertex and fragment components. The
+ * input attributes are a position (as a Vector3) and a uv (as a Vector2). It also takes a uniform
+ * to be used as the entire model/view/projection matrix. The shader expects a single texture for
+ * fragment shading, and does no other lighting calculations (thus no uniforms for lights or normal
+ * attributes).
+ */
+class Shader {
+public:
+    /*!
+     * Loads a shader given the full sourcecode and names for necessary attributes and uniforms to
+     * link to. Returns a valid shader on success or null on failure. Shader resources are
+     * automatically cleaned up on destruction.
+     *
+     * @param vertexSource The full source code for your vertex program
+     * @param fragmentSource The full source code of your fragment program
+     * @param positionAttributeName The name of the position attribute in your vertex program
+     * @param uvAttributeName The name of the uv coordinate attribute in your vertex program
+     * @param projectionMatrixUniformName The name of your model/view/projection matrix uniform
+     * @return a valid Shader on success, otherwise null.
+     */
+    static Shader *loadShader(
+            const std::string &vertexSource,
+            const std::string &fragmentSource,
+            const std::string &positionAttributeName,
+            const std::string &uvAttributeName,
+            const std::string &projectionMatrixUniformName);
+
+    inline ~Shader() {
+        if (program_) {
+            glDeleteProgram(program_);
+            program_ = 0;
+        }
+    }
+
+    /*!
+     * Prepares the shader for use, call this before executing any draw commands
+     */
+    void activate() const;
+
+    /*!
+     * Cleans up the shader after use, call this after executing any draw commands
+     */
+    void deactivate() const;
+
+    /*!
+     * Renders a single model
+     * @param model a model to render
+     */
+    void drawModel(const Model &model) const;
+
+    /*!
+     * Sets the model/view/projection matrix in the shader.
+     * @param projectionMatrix sixteen floats, column major, defining an OpenGL projection matrix.
+     */
+    void setProjectionMatrix(float *projectionMatrix) const;
+
+private:
+    /*!
+     * Helper function to load a shader of a given type
+     * @param shaderType The OpenGL shader type. Should either be GL_VERTEX_SHADER or GL_FRAGMENT_SHADER
+     * @param shaderSource The full source of the shader
+     * @return the id of the shader, as returned by glCreateShader, or 0 in the case of an error
+     */
+    static GLuint loadShader(GLenum shaderType, const std::string &shaderSource);
+
+    /*!
+     * Constructs a new instance of a shader. Use @a loadShader
+     * @param program the GL program id of the shader
+     * @param position the attribute location of the position
+     * @param uv the attribute location of the uv coordinates
+     * @param projectionMatrix the uniform location of the projection matrix
+     */
+    constexpr Shader(
+            GLuint program,
+            GLint position,
+            GLint uv,
+            GLint projectionMatrix)
+            : program_(program),
+              position_(position),
+              uv_(uv),
+              projectionMatrix_(projectionMatrix) {}
+
+    GLuint program_;
+    GLint position_;
+    GLint uv_;
+    GLint projectionMatrix_;
+};
+
+#endif //ANDROIDGLINVESTIGATIONS_SHADER_H

app/src/main/cpp/TextureAsset.cpp

@@ -0,0 +1,80 @@
+#include <android/imagedecoder.h>
+#include "TextureAsset.h"
+#include "AndroidOut.h"
+#include "Utility.h"
+
+std::shared_ptr<TextureAsset>
+TextureAsset::loadAsset(AAssetManager *assetManager, const std::string &assetPath) {
+    // Get the image from asset manager
+    auto pAndroidRobotPng = AAssetManager_open(
+            assetManager,
+            assetPath.c_str(),
+            AASSET_MODE_BUFFER);
+
+    // Make a decoder to turn it into a texture
+    AImageDecoder *pAndroidDecoder = nullptr;
+    auto result = AImageDecoder_createFromAAsset(pAndroidRobotPng, &pAndroidDecoder);
+    assert(result == ANDROID_IMAGE_DECODER_SUCCESS);
+
+    // make sure we get 8 bits per channel out. RGBA order.
+    AImageDecoder_setAndroidBitmapFormat(pAndroidDecoder, ANDROID_BITMAP_FORMAT_RGBA_8888);
+
+    // Get the image header, to help set everything up
+    const AImageDecoderHeaderInfo *pAndroidHeader = nullptr;
+    pAndroidHeader = AImageDecoder_getHeaderInfo(pAndroidDecoder);
+
+    // important metrics for sending to GL
+    auto width = AImageDecoderHeaderInfo_getWidth(pAndroidHeader);
+    auto height = AImageDecoderHeaderInfo_getHeight(pAndroidHeader);
+    auto stride = AImageDecoder_getMinimumStride(pAndroidDecoder);
+
+    // Get the bitmap data of the image
+    auto upAndroidImageData = std::make_unique<std::vector<uint8_t>>(height * stride);
+    auto decodeResult = AImageDecoder_decodeImage(
+            pAndroidDecoder,
+            upAndroidImageData->data(),
+            stride,
+            upAndroidImageData->size());
+    assert(decodeResult == ANDROID_IMAGE_DECODER_SUCCESS);
+
+    // Get an opengl texture
+    GLuint textureId;
+    glGenTextures(1, &textureId);
+    glBindTexture(GL_TEXTURE_2D, textureId);
+
+    // Clamp to the edge, you'll get odd results alpha blending if you don't
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+
+    // Load the texture into VRAM
+    glTexImage2D(
+            GL_TEXTURE_2D, // target
+            0, // mip level
+            GL_RGBA, // internal format, often advisable to use BGR
+            width, // width of the texture
+            height, // height of the texture
+            0, // border (always 0)
+            GL_RGBA, // format
+            GL_UNSIGNED_BYTE, // type
+            upAndroidImageData->data() // Data to upload
+    );
+
+    // generate mip levels. Not really needed for 2D, but good to do
+    glGenerateMipmap(GL_TEXTURE_2D);
+
+    // cleanup helpers
+    AImageDecoder_delete(pAndroidDecoder);
+    AAsset_close(pAndroidRobotPng);
+
+    // Create a shared pointer so it can be cleaned up easily/automatically
+    return std::shared_ptr<TextureAsset>(new TextureAsset(textureId));
+}
+
+TextureAsset::~TextureAsset() {
+    // return texture resources
+    glDeleteTextures(1, &textureID_);
+    textureID_ = 0;
+}

app/src/main/cpp/TextureAsset.h

@@ -0,0 +1,34 @@
+#ifndef ANDROIDGLINVESTIGATIONS_TEXTUREASSET_H
+#define ANDROIDGLINVESTIGATIONS_TEXTUREASSET_H
+
+#include <memory>
+#include <android/asset_manager.h>
+#include <GLES3/gl3.h>
+#include <string>
+#include <vector>
+
+class TextureAsset {
+public:
+    /*!
+     * Loads a texture asset from the assets/ directory
+     * @param assetManager Asset manager to use
+     * @param assetPath The path to the asset
+     * @return a shared pointer to a texture asset, resources will be reclaimed when it's cleaned up
+     */
+    static std::shared_ptr<TextureAsset>
+    loadAsset(AAssetManager *assetManager, const std::string &assetPath);
+
+    ~TextureAsset();
+
+    /*!
+     * @return the texture id for use with OpenGL
+     */
+    constexpr GLuint getTextureID() const { return textureID_; }
+
+private:
+    inline TextureAsset(GLuint textureId) : textureID_(textureId) {}
+
+    GLuint textureID_;
+};
+
+#endif //ANDROIDGLINVESTIGATIONS_TEXTUREASSET_H

app/src/main/cpp/Utility.cpp

@@ -0,0 +1,87 @@
+#include "Utility.h"
+#include "AndroidOut.h"
+
+#include <GLES3/gl3.h>
+
+#define CHECK_ERROR(e) case e: aout << "GL Error: "#e << std::endl; break;
+
+bool Utility::checkAndLogGlError(bool alwaysLog) {
+    GLenum error = glGetError();
+    if (error == GL_NO_ERROR) {
+        if (alwaysLog) {
+            aout << "No GL error" << std::endl;
+        }
+        return true;
+    } else {
+        switch (error) {
+            CHECK_ERROR(GL_INVALID_ENUM);
+            CHECK_ERROR(GL_INVALID_VALUE);
+            CHECK_ERROR(GL_INVALID_OPERATION);
+            CHECK_ERROR(GL_INVALID_FRAMEBUFFER_OPERATION);
+            CHECK_ERROR(GL_OUT_OF_MEMORY);
+            default:
+                aout << "Unknown GL error: " << error << std::endl;
+        }
+        return false;
+    }
+}
+
+float *
+Utility::buildOrthographicMatrix(float *outMatrix, float halfHeight, float aspect, float near,
+                                 float far) {
+    float halfWidth = halfHeight * aspect;
+
+    // column 1
+    outMatrix[0] = 1.f / halfWidth;
+    outMatrix[1] = 0.f;
+    outMatrix[2] = 0.f;
+    outMatrix[3] = 0.f;
+
+    // column 2
+    outMatrix[4] = 0.f;
+    outMatrix[5] = 1.f / halfHeight;
+    outMatrix[6] = 0.f;
+    outMatrix[7] = 0.f;
+
+    // column 3
+    outMatrix[8] = 0.f;
+    outMatrix[9] = 0.f;
+    outMatrix[10] = -2.f / (far - near);
+    outMatrix[11] = -(far + near) / (far - near);
+
+    // column 4
+    outMatrix[12] = 0.f;
+    outMatrix[13] = 0.f;
+    outMatrix[14] = 0.f;
+    outMatrix[15] = 1.f;
+
+    return outMatrix;
+}
+
+float *Utility::buildIdentityMatrix(float *outMatrix) {
+    // column 1
+    outMatrix[0] = 1.f;
+    outMatrix[1] = 0.f;
+    outMatrix[2] = 0.f;
+    outMatrix[3] = 0.f;
+
+    // column 2
+    outMatrix[4] = 0.f;
+    outMatrix[5] = 1.f;
+    outMatrix[6] = 0.f;
+    outMatrix[7] = 0.f;
+
+    // column 3
+    outMatrix[8] = 0.f;
+    outMatrix[9] = 0.f;
+    outMatrix[10] = 1.f;
+    outMatrix[11] = 0.f;
+
+    // column 4
+    outMatrix[12] = 0.f;
+    outMatrix[13] = 0.f;
+    outMatrix[14] = 0.f;
+    outMatrix[15] = 1.f;
+
+    return outMatrix;
+}

app/src/main/cpp/Utility.h

@@ -0,0 +1,34 @@
+#ifndef ANDROIDGLINVESTIGATIONS_UTILITY_H
+#define ANDROIDGLINVESTIGATIONS_UTILITY_H
+
+#include <cassert>
+
+class Utility {
+public:
+    static bool checkAndLogGlError(bool alwaysLog = false);
+
+    static inline void assertGlError() { assert(checkAndLogGlError()); }
+
+    /**
+     * Generates an orthographic projection matrix given the half height, aspect ratio, near, and far
+     * planes
+     *
+     * @param outMatrix the matrix to write into
+     * @param halfHeight half of the height of the screen
+     * @param aspect the width of the screen divided by the height
+     * @param near the distance of the near plane
+     * @param far the distance of the far plane
+     * @return the generated matrix, this will be the same as @a outMatrix so you can chain calls
+     *     together if needed
+     */
+    static float *buildOrthographicMatrix(
+            float *outMatrix,
+            float halfHeight,
+            float aspect,
+            float near,
+            float far);
+
+    static float *buildIdentityMatrix(float *outMatrix);
+};
+
+#endif //ANDROIDGLINVESTIGATIONS_UTILITY_H

app/src/main/cpp/main.cpp

@@ -0,0 +1,116 @@
+#include <jni.h>
+
+#include <game-activity/native_app_glue/android_native_app_glue.h>
+#include <game-activity/GameActivity.h>
+
+#include "AndroidOut.h"
+#include "Renderer.h"
+
+extern "C" {
+
+/*!
+ * Handles commands sent to this Android application
+ * @param pApp the app the commands are coming from
+ * @param cmd the command to handle
+ */
+void handle_cmd(android_app *pApp, int32_t cmd) {
+    switch (cmd) {
+        case APP_CMD_INIT_WINDOW:
+            // A new window is created, associate a renderer with it. You may replace this with a
+            // "game" class if that suits your needs. Remember to change all instances of userData
+            // if you change the class here as a reinterpret_cast is dangerous this in the
+            // android_main function and the APP_CMD_TERM_WINDOW handler case.
+            pApp->userData = new Renderer(pApp);
+            break;
+        case APP_CMD_TERM_WINDOW:
+            // The window is being destroyed. Use this to clean up your userData to avoid leaking
+            // resources.
+            //
+            // We have to check if userData is assigned just in case this comes in really quickly
+            if (pApp->userData) {
+                //
+                auto *pRenderer = reinterpret_cast<Renderer *>(pApp->userData);
+                pApp->userData = nullptr;
+                delete pRenderer;
+            }
+            break;
+        default:
+            break;
+    }
+}
+
+/*!
+ * Enable the motion events you want to handle; not handled events are
+ * passed back to OS for further processing. For this example case,
+ * only pointer and joystick devices are enabled.
+ *
+ * @param motionEvent the newly arrived GameActivityMotionEvent.
+ * @return true if the event is from a pointer or joystick device,
+ *         false for all other input devices.
+ */
+bool motion_event_filter_func(const GameActivityMotionEvent *motionEvent) {
+    auto sourceClass = motionEvent->source & AINPUT_SOURCE_CLASS_MASK;
+    return (sourceClass == AINPUT_SOURCE_CLASS_POINTER ||
+            sourceClass == AINPUT_SOURCE_CLASS_JOYSTICK);
+}
+
+/*!
+ * This the main entry point for a native activity
+ */
+void android_main(struct android_app *pApp) {
+    // Can be removed, useful to ensure your code is running
+    aout << "Welcome to android_main" << std::endl;
+
+    // Register an event handler for Android events
+    pApp->onAppCmd = handle_cmd;
+
+    // Set input event filters (set it to NULL if the app wants to process all inputs).
+    // Note that for key inputs, this example uses the default default_key_filter()
+    // implemented in android_native_app_glue.c.
+    android_app_set_motion_event_filter(pApp, motion_event_filter_func);
+
+    // This sets up a typical game/event loop. It will run until the app is destroyed.
+    do {
+        // Process all pending events before running game logic.
+        bool done = false;
+        while (!done) {
+            // 0 is non-blocking.
+            int timeout = 0;
+            int events;
+            android_poll_source *pSource;
+            int result = ALooper_pollOnce(timeout, nullptr, &events,
+                                          reinterpret_cast<void**>(&pSource));
+            switch (result) {
+                case ALOOPER_POLL_TIMEOUT:
+                    [[clang::fallthrough]];
+                case ALOOPER_POLL_WAKE:
+                    // No events occurred before the timeout or explicit wake. Stop checking for events.
+                    done = true;
+                    break;
+                case ALOOPER_EVENT_ERROR:
+                    aout << "ALooper_pollOnce returned an error" << std::endl;
+                    break;
+                case ALOOPER_POLL_CALLBACK:
+                    break;
+                default:
+                    if (pSource) {
+                        pSource->process(pApp, pSource);
+                    }
+            }
+        }
+
+        // Check if any user data is associated. This is assigned in handle_cmd
+        if (pApp->userData) {
+            // We know that our user data is a Renderer, so reinterpret cast it. If you change your
+            // user data remember to change it here
+            auto *pRenderer = reinterpret_cast<Renderer *>(pApp->userData);
+
+            // Process game input
+            pRenderer->handleInput();
+
+            // Render a frame
+            pRenderer->render();
+        }
+    } while (!pApp->destroyRequested);
+}
+}

app/src/main/java/com/hmwl/sample/MainActivity.java

@@ -0,0 +1,32 @@
+package com.hmwl.sample;
+
+import android.view.View;
+
+import com.google.androidgamesdk.GameActivity;
+
+public class MainActivity extends GameActivity {
+    static {
+        System.loadLibrary("sample");
+    }
+
+    @Override
+    public void onWindowFocusChanged(boolean hasFocus) {
+        super.onWindowFocusChanged(hasFocus);
+
+        if (hasFocus) {
+            hideSystemUi();
+        }
+    }
+
+    private void hideSystemUi() {
+        View decorView = getWindow().getDecorView();
+        decorView.setSystemUiVisibility(
+                View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY
+                        | View.SYSTEM_UI_FLAG_LAYOUT_STABLE
+                        | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
+                        | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
+                        | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION
+                        | View.SYSTEM_UI_FLAG_FULLSCREEN
+        );
+    }
+}

app/src/main/res/drawable/ic_launcher_background.xml

@@ -0,0 +1,170 @@
+<?xml version="1.0" encoding="utf-8"?>
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="108dp"
+    android:height="108dp"
+    android:viewportWidth="108"
+    android:viewportHeight="108">
+    <path
+        android:fillColor="#3DDC84"
+        android:pathData="M0,0h108v108h-108z" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M9,0L9,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,0L19,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M29,0L29,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M39,0L39,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M49,0L49,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M59,0L59,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M69,0L69,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M79,0L79,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M89,0L89,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M99,0L99,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,9L108,9"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,19L108,19"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,29L108,29"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,39L108,39"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,49L108,49"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,59L108,59"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,69L108,69"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,79L108,79"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,89L108,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,99L108,99"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,29L89,29"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,39L89,39"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,49L89,49"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,59L89,59"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,69L89,69"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,79L89,79"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M29,19L29,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M39,19L39,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M49,19L49,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M59,19L59,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M69,19L69,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M79,19L79,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+</vector>

app/src/main/res/drawable/ic_launcher_foreground.xml

@@ -0,0 +1,30 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:aapt="http://schemas.android.com/aapt"
+    android:width="108dp"
+    android:height="108dp"
+    android:viewportWidth="108"
+    android:viewportHeight="108">
+    <path android:pathData="M31,63.928c0,0 6.4,-11 12.1,-13.1c7.2,-2.6 26,-1.4 26,-1.4l38.1,38.1L107,108.928l-32,-1L31,63.928z">
+        <aapt:attr name="android:fillColor">
+            <gradient
+                android:endX="85.84757"
+                android:endY="92.4963"
+                android:startX="42.9492"
+                android:startY="49.59793"
+                android:type="linear">
+                <item
+                    android:color="#44000000"
+                    android:offset="0.0" />
+                <item
+                    android:color="#00000000"
+                    android:offset="1.0" />
+            </gradient>
+        </aapt:attr>
+    </path>
+    <path
+        android:fillColor="#FFFFFF"
+        android:fillType="nonZero"
+        android:pathData="M65.3,45.828l3.8,-6.6c0.2,-0.4 0.1,-0.9 -0.3,-1.1c-0.4,-0.2 -0.9,-0.1 -1.1,0.3l-3.9,6.7c-6.3,-2.8 -13.4,-2.8 -19.7,0l-3.9,-6.7c-0.2,-0.4 -0.7,-0.5 -1.1,-0.3C38.8,38.328 38.7,38.828 38.9,39.228l3.8,6.6C36.2,49.428 31.7,56.028 31,63.928h46C76.3,56.028 71.8,49.428 65.3,45.828zM43.4,57.328c-0.8,0 -1.5,-0.5 -1.8,-1.2c-0.3,-0.7 -0.1,-1.5 0.4,-2.1c0.5,-0.5 1.4,-0.7 2.1,-0.4c0.7,0.3 1.2,1 1.2,1.8C45.3,56.528 44.5,57.328 43.4,57.328L43.4,57.328zM64.6,57.328c-0.8,0 -1.5,-0.5 -1.8,-1.2s-0.1,-1.5 0.4,-2.1c0.5,-0.5 1.4,-0.7 2.1,-0.4c0.7,0.3 1.2,1 1.2,1.8C66.5,56.528 65.6,57.328 64.6,57.328L64.6,57.328z"
+        android:strokeWidth="1"
+        android:strokeColor="#00000000" />
+</vector>

app/src/main/res/mipmap-anydpi/ic_launcher.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8"?>
+<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
+    <background android:drawable="@drawable/ic_launcher_background" />
+    <foreground android:drawable="@drawable/ic_launcher_foreground" />
+    <monochrome android:drawable="@drawable/ic_launcher_foreground" />
+</adaptive-icon>

app/src/main/res/mipmap-anydpi/ic_launcher_round.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8"?>
+<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
+    <background android:drawable="@drawable/ic_launcher_background" />
+    <foreground android:drawable="@drawable/ic_launcher_foreground" />
+    <monochrome android:drawable="@drawable/ic_launcher_foreground" />
+</adaptive-icon>

app/src/main/res/values-night/themes.xml

@@ -0,0 +1,16 @@
+<resources xmlns:tools="http://schemas.android.com/tools">
+    <!-- Base application theme. -->
+    <style name="Theme.Sample" parent="Theme.MaterialComponents.DayNight.DarkActionBar">
+        <!-- Primary brand color. -->
+        <item name="colorPrimary">@color/purple_200</item>
+        <item name="colorPrimaryVariant">@color/purple_700</item>
+        <item name="colorOnPrimary">@color/black</item>
+        <!-- Secondary brand color. -->
+        <item name="colorSecondary">@color/teal_200</item>
+        <item name="colorSecondaryVariant">@color/teal_200</item>
+        <item name="colorOnSecondary">@color/black</item>
+        <!-- Status bar color. -->
+        <item name="android:statusBarColor">?attr/colorPrimaryVariant</item>
+        <!-- Customize your theme here. -->
+    </style>
+</resources>

app/src/main/res/values/colors.xml

@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <color name="purple_200">#FFBB86FC</color>
+    <color name="purple_500">#FF6200EE</color>
+    <color name="purple_700">#FF3700B3</color>
+    <color name="teal_200">#FF03DAC5</color>
+    <color name="teal_700">#FF018786</color>
+    <color name="black">#FF000000</color>
+    <color name="white">#FFFFFFFF</color>
+</resources>

app/src/main/res/values/strings.xml

@@ -0,0 +1,3 @@
+<resources>
+    <string name="app_name">Sample</string>
+</resources>

app/src/main/res/values/themes.xml

@@ -0,0 +1,16 @@
+<resources xmlns:tools="http://schemas.android.com/tools">
+    <!-- Base application theme. -->
+    <style name="Theme.Sample" parent="Theme.MaterialComponents.DayNight.DarkActionBar">
+        <!-- Primary brand color. -->
+        <item name="colorPrimary">@color/purple_500</item>
+        <item name="colorPrimaryVariant">@color/purple_700</item>
+        <item name="colorOnPrimary">@color/white</item>
+        <!-- Secondary brand color. -->
+        <item name="colorSecondary">@color/teal_200</item>
+        <item name="colorSecondaryVariant">@color/teal_700</item>
+        <item name="colorOnSecondary">@color/black</item>
+        <!-- Status bar color. -->
+        <item name="android:statusBarColor">?attr/colorPrimaryVariant</item>
+        <!-- Customize your theme here. -->
+    </style>
+</resources>

app/src/main/res/xml/backup_rules.xml

@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="utf-8"?><!--
+   Sample backup rules file; uncomment and customize as necessary.
+   See https://developer.android.com/guide/topics/data/autobackup
+   for details.
+   Note: This file is ignored for devices older than API 31
+   See https://developer.android.com/about/versions/12/backup-restore
+-->
+<full-backup-content>
+    <!--
+   <include domain="sharedpref" path="."/>
+   <exclude domain="sharedpref" path="device.xml"/>
+-->
+</full-backup-content>

app/src/main/res/xml/data_extraction_rules.xml

@@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="utf-8"?><!--
+   Sample data extraction rules file; uncomment and customize as necessary.
+   See https://developer.android.com/about/versions/12/backup-restore#xml-changes
+   for details.
+-->
+<data-extraction-rules>
+    <cloud-backup>
+        <!-- TODO: Use <include> and <exclude> to control what is backed up.
+        <include .../>
+        <exclude .../>
+        -->
+    </cloud-backup>
+    <!--
+    <device-transfer>
+        <include .../>
+        <exclude .../>
+    </device-transfer>
+    -->
+</data-extraction-rules>

app/src/test/java/com/hmwl/sample/ExampleUnitTest.java

@@ -0,0 +1,17 @@
+package com.hmwl.sample;
+
+import org.junit.Test;
+
+import static org.junit.Assert.*;
+
+/**
+ * Example local unit test, which will execute on the development machine (host).
+ *
+ * @see <a href="http://d.android.com/tools/testing">Testing documentation</a>
+ */
+public class ExampleUnitTest {
+    @Test
+    public void addition_isCorrect() {
+        assertEquals(4, 2 + 2);
+    }
+}

build.gradle

@@ -0,0 +1,4 @@
+// Top-level build file where you can add configuration options common to all sub-projects/modules.
+plugins {
+alias(libs.plugins.android.application) apply false
+}

gradle.properties

@@ -0,0 +1,21 @@
+# Project-wide Gradle settings.
+# IDE (e.g. Android Studio) users:
+# Gradle settings configured through the IDE *will override*
+# any settings specified in this file.
+# For more details on how to configure your build environment visit
+# http://www.gradle.org/docs/current/userguide/build_environment.html
+# Specifies the JVM arguments used for the daemon process.
+# The setting is particularly useful for tweaking memory settings.
+org.gradle.jvmargs=-Xmx2048m -Dfile.encoding=UTF-8
+# When configured, Gradle will run in incubating parallel mode.
+# This option should only be used with decoupled projects. For more details, visit
+# https://developer.android.com/r/tools/gradle-multi-project-decoupled-projects
+# org.gradle.parallel=true
+# AndroidX package structure to make it clearer which packages are bundled with the
+# Android operating system, and which are packaged with your app's APK
+# https://developer.android.com/topic/libraries/support-library/androidx-rn
+android.useAndroidX=true
+# Enables namespacing of each library's R class so that its R class includes only the
+# resources declared in the library itself and none from the library's dependencies,
+# thereby reducing the size of the R class for that library
+android.nonTransitiveRClass=true

gradle/libs.versions.toml

@@ -0,0 +1,20 @@
+[versions]
+agp = "8.13.0"
+junit = "4.13.2"
+junitVersion = "1.3.0"
+espressoCore = "3.7.0"
+appcompat = "1.7.1"
+material = "1.13.0"
+gamesActivity = "4.0.0"
+
+[libraries]
+junit = { group = "junit", name = "junit", version.ref = "junit" }
+ext-junit = { group = "androidx.test.ext", name = "junit", version.ref = "junitVersion" }
+espresso-core = { group = "androidx.test.espresso", name = "espresso-core", version.ref = "espressoCore" }
+appcompat = { group = "androidx.appcompat", name = "appcompat", version.ref = "appcompat" }
+material = { group = "com.google.android.material", name = "material", version.ref = "material" }
+games-activity = { group = "androidx.games", name = "games-activity", version.ref = "gamesActivity" }
+
+[plugins]
+android-application = { id = "com.android.application", version.ref = "agp" }
+

gradle/wrapper/gradle-wrapper.properties

@@ -0,0 +1,6 @@
+#Wed Oct 15 17:29:15 CST 2025
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.13-bin.zip
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists

gradlew

@@ -0,0 +1,185 @@
+#!/usr/bin/env sh
+
+#
+# Copyright 2015 the original author or authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+##############################################################################
+##
+##  Gradle start up script for UN*X
+##
+##############################################################################
+
+# Attempt to set APP_HOME
+# Resolve links: $0 may be a link
+PRG="$0"
+# Need this for relative symlinks.
+while [ -h "$PRG" ] ; do
+    ls=`ls -ld "$PRG"`
+    link=`expr "$ls" : '.*-> \(.*\)$'`
+    if expr "$link" : '/.*' > /dev/null; then
+        PRG="$link"
+    else
+        PRG=`dirname "$PRG"`"/$link"
+    fi
+done
+SAVED="`pwd`"
+cd "`dirname \"$PRG\"`/" >/dev/null
+APP_HOME="`pwd -P`"
+cd "$SAVED" >/dev/null
+
+APP_NAME="Gradle"
+APP_BASE_NAME=`basename "$0"`
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD="maximum"
+
+warn () {
+    echo "$*"
+}
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+}
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "`uname`" in
+  CYGWIN* )
+    cygwin=true
+    ;;
+  Darwin* )
+    darwin=true
+    ;;
+  MINGW* )
+    msys=true
+    ;;
+  NONSTOP* )
+    nonstop=true
+    ;;
+esac
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD="$JAVA_HOME/jre/sh/java"
+    else
+        JAVACMD="$JAVA_HOME/bin/java"
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD="java"
+    which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+fi
+
+# Increase the maximum file descriptors if we can.
+if [ "$cygwin" = "false" -a "$darwin" = "false" -a "$nonstop" = "false" ] ; then
+    MAX_FD_LIMIT=`ulimit -H -n`
+    if [ $? -eq 0 ] ; then
+        if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then
+            MAX_FD="$MAX_FD_LIMIT"
+        fi
+        ulimit -n $MAX_FD
+        if [ $? -ne 0 ] ; then
+            warn "Could not set maximum file descriptor limit: $MAX_FD"
+        fi
+    else
+        warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT"
+    fi
+fi
+
+# For Darwin, add options to specify how the application appears in the dock
+if $darwin; then
+    GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\""
+fi
+
+# For Cygwin or MSYS, switch paths to Windows format before running java
+if [ "$cygwin" = "true" -o "$msys" = "true" ] ; then
+    APP_HOME=`cygpath --path --mixed "$APP_HOME"`
+    CLASSPATH=`cygpath --path --mixed "$CLASSPATH"`
+
+    JAVACMD=`cygpath --unix "$JAVACMD"`
+
+    # We build the pattern for arguments to be converted via cygpath
+    ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null`
+    SEP=""
+    for dir in $ROOTDIRSRAW ; do
+        ROOTDIRS="$ROOTDIRS$SEP$dir"
+        SEP="|"
+    done
+    OURCYGPATTERN="(^($ROOTDIRS))"
+    # Add a user-defined pattern to the cygpath arguments
+    if [ "$GRADLE_CYGPATTERN" != "" ] ; then
+        OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)"
+    fi
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    i=0
+    for arg in "$@" ; do
+        CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -`
+        CHECK2=`echo "$arg"|egrep -c "^-"`                                 ### Determine if an option
+
+        if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then                    ### Added a condition
+            eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"`
+        else
+            eval `echo args$i`="\"$arg\""
+        fi
+        i=`expr $i + 1`
+    done
+    case $i in
+        0) set -- ;;
+        1) set -- "$args0" ;;
+        2) set -- "$args0" "$args1" ;;
+        3) set -- "$args0" "$args1" "$args2" ;;
+        4) set -- "$args0" "$args1" "$args2" "$args3" ;;
+        5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
+        6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
+        7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
+        8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
+        9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
+    esac
+fi
+
+# Escape application args
+save () {
+    for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done
+    echo " "
+}
+APP_ARGS=`save "$@"`
+
+# Collect all arguments for the java command, following the shell quoting and substitution rules
+eval set -- $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS "\"-Dorg.gradle.appname=$APP_BASE_NAME\"" -classpath "\"$CLASSPATH\"" org.gradle.wrapper.GradleWrapperMain "$APP_ARGS"
+
+exec "$JAVACMD" "$@"

gradlew.bat

@@ -0,0 +1,89 @@
+@rem
+@rem Copyright 2015 the original author or authors.
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem You may obtain a copy of the License at
+@rem
+@rem      https://www.apache.org/licenses/LICENSE-2.0
+@rem
+@rem Unless required by applicable law or agreed to in writing, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+@rem
+
+@if "%DEBUG%" == "" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%" == "" set DIRNAME=.
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Resolve any "." and ".." in APP_HOME to make it shorter.
+for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if "%ERRORLEVEL%" == "0" goto execute
+
+echo.
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto execute
+
+echo.
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %*
+
+:end
+@rem End local scope for the variables with windows NT shell
+if "%ERRORLEVEL%"=="0" goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+if  not "" == "%GRADLE_EXIT_CONSOLE%" exit 1
+exit /b 1
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega

settings.gradle

@@ -0,0 +1,23 @@
+pluginManagement {
+    repositories {
+        google {
+            content {
+                includeGroupByRegex("com\\.android.*")
+                includeGroupByRegex("com\\.google.*")
+                includeGroupByRegex("androidx.*")
+            }
+        }
+        mavenCentral()
+        gradlePluginPortal()
+    }
+}
+dependencyResolutionManagement {
+    repositoriesMode.set(RepositoriesMode.FAIL_ON_PROJECT_REPOS)
+    repositories {
+        google()
+        mavenCentral()
+    }
+}
+
+rootProject.name = "Sample"
+include ':app'