Vulkan-Samples/app/android/java/com/khronos/vulkan_samples/MainActivity.java

package com.khronos.vulkan_samples;


import android.Manifest;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.graphics.Color;
import android.os.Bundle;
import android.os.Debug;
import android.util.Log;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.Toast;

import androidx.activity.EdgeToEdge;
import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.camera.core.Camera;
import androidx.camera.core.CameraSelector;
import androidx.camera.core.Preview;
import androidx.camera.lifecycle.ProcessCameraProvider;
import androidx.camera.view.PreviewView;
import androidx.core.app.ActivityCompat;
import androidx.core.content.ContextCompat;
import androidx.core.graphics.Insets;
import androidx.core.view.ViewCompat;
import androidx.core.view.WindowInsetsCompat;

import com.google.androidgamesdk.GameActivity;
import com.google.common.util.concurrent.ListenableFuture;
import com.google.mediapipe.examples.facelandmarker.FaceLandmarkerHelper;

import java.util.concurrent.ExecutionException;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

public class MainActivity extends GameActivity {


    private ExecutorService backgroundExecutor;
    private FaceLandmarkerHelper faceLandmarkerHelper;

    private PreviewView previewView;
    private ProcessCameraProvider cameraProvider;
    private Camera camera;

    private void initCamera(){
        // 添加 PreviewView 用于摄像头预览
        previewView = new PreviewView(this);
        previewView.setImplementationMode(PreviewView.ImplementationMode.COMPATIBLE);

        // 将 PreviewView 添加到布局中
        addContentView(previewView, new ViewGroup.LayoutParams(
                ViewGroup.LayoutParams.MATCH_PARENT,
                ViewGroup.LayoutParams.MATCH_PARENT));

//        ensureVulkanLayerTransparent();

        // 检查权限并启动相机
        if (hasCameraPermission()) {
            startCamera();
        } else {
            requestCameraPermission();
        }
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        String native_lib_name = getResources().getString(R.string.native_lib_name);
        try {
            System.loadLibrary(native_lib_name);
        } catch (UnsatisfiedLinkError e) {
            Toast.makeText(getApplicationContext(), "Native code library failed to load.", Toast.LENGTH_SHORT).show();
        }
        String[] argArray = new String[2];
        argArray[0] = "sample";
        argArray[1] = "hello_triangle";
        sendArgumentsToPlatform(argArray);
        super.onCreate(savedInstanceState);

        initCamera();
        Log.i("MainActivity", "onCreate: ");

        // 添加按钮到布局
//        addButtonToLayout();

//        backgroundExecutor = Executors.newSingleThreadExecutor();
//        backgroundExecutor.execute(new Runnable() {
//            @Override
//            public void run() {
//                if (faceLandmarkerHelper.isClose()) {
//                    faceLandmarkerHelper.setupFaceLandmarker();
//                }
//            }
//        });
    }

    private void ensureVulkanLayerTransparent() {
        // 延迟执行以确保 GameActivity 的视图已经创建
        previewView.post(() -> {
            ViewGroup rootView = (ViewGroup) getWindow().getDecorView().getRootView();
            makeViewTransparent(rootView);
        });
    }

    private void makeViewTransparent(ViewGroup viewGroup) {
        for (int i = 0; i < viewGroup.getChildCount(); i++) {
            View child = viewGroup.getChildAt(i);
            if (child instanceof ViewGroup) {
                makeViewTransparent((ViewGroup) child);
            } else {
                // 找到可能是 Vulkan 渲染层的视图并设置为透明
                if (child.getBackground() != null) {
                    child.setBackgroundColor(Color.TRANSPARENT);
                }
            }
        }
    }

    private boolean hasCameraPermission() {
        return ContextCompat.checkSelfPermission(this, Manifest.permission.CAMERA)
                == PackageManager.PERMISSION_GRANTED;
    }

    private void requestCameraPermission() {
        ActivityCompat.requestPermissions(this,
                new String[]{Manifest.permission.CAMERA},
                REQUEST_CAMERA_PERMISSION);
    }

    private static final int REQUEST_CAMERA_PERMISSION = 1001;

    private void startCamera() {
        ListenableFuture<ProcessCameraProvider> cameraProviderFuture =
                ProcessCameraProvider.getInstance(this);

        cameraProviderFuture.addListener(() -> {
            try {
                cameraProvider = cameraProviderFuture.get();

                // 创建预览用例
                Preview preview = new Preview.Builder().build();

                // 选择后置摄像头
                CameraSelector cameraSelector = new CameraSelector.Builder()
                        .requireLensFacing(CameraSelector.LENS_FACING_BACK)
                        .build();

                // 将预览绑定到 PreviewView
                preview.setSurfaceProvider(previewView.getSurfaceProvider());

                // 绑定到生命周期
                camera = cameraProvider.bindToLifecycle(this, cameraSelector, preview);

            } catch (ExecutionException | InterruptedException e) {
                Log.e("MainActivity", "Error starting camera: " + e.getMessage());
            }
        }, ContextCompat.getMainExecutor(this));
    }

    private static final int REQUEST_CODE_PERMISSIONS = 1001;
    private static final String[] REQUIRED_PERMISSIONS = new String[]{Manifest.permission.CAMERA};
    private static final String TAG = "MainActivity";

    private boolean allPermissionsGranted() {
        for (String permission : REQUIRED_PERMISSIONS) {
            if (ContextCompat.checkSelfPermission(this, permission) != PackageManager.PERMISSION_GRANTED) {
                return false;
            }
        }
        return true;
    }

    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        if (requestCode == REQUEST_CODE_PERMISSIONS) {
            if (allPermissionsGranted()) {
                startCamera();
            } else {
                Log.e(TAG, "Permissions not granted by the user.");
                finish(); // Close the activity if permission is denied
            }
        }
    }

    private void addButtonToLayout() {
        // 创建按钮
        Button button = new Button(this);
        button.setText("Vulkan 按钮");

        // 设置按钮位置（使用绝对坐标）
        button.setX(50);  // 距离左边50像素
        button.setY(50);  // 距离顶部50像素

        // 设置按钮点击事件
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                onButtonClicked();
            }
        });

        // 将按钮添加到 GameActivity 的布局中（不会覆盖 Vulkan 表面）
        addContentView(button, new ViewGroup.LayoutParams(
                ViewGroup.LayoutParams.WRAP_CONTENT,
                ViewGroup.LayoutParams.WRAP_CONTENT
        ));
    }


    private void onButtonClicked() {
        Toast.makeText(this, "Vulkan 按钮被点击了!", Toast.LENGTH_SHORT).show();
        nativeButtonClicked();
        // 启动SecondActivity
        Intent intent = new Intent(MainActivity.this, SecondActivity.class);
        // 可以传递数据
        intent.putExtra("message", "Hello from MainActivity!");
        startActivity(intent);
    }

    private native void nativeButtonClicked();

    private native void sendArgumentsToPlatform(String[] args);
}