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

package com.khronos.vulkan_samples;


import android.Manifest;
import android.content.pm.PackageManager;
import android.graphics.Color;
import android.graphics.PixelFormat;
import android.graphics.SurfaceTexture;
import android.os.Bundle;
import android.util.Log;
import android.view.Surface;
import android.view.SurfaceView;
import android.view.TextureView;
import android.view.View;
import android.view.ViewGroup;
import android.widget.FrameLayout;
import android.widget.Toast;

import androidx.annotation.NonNull;
import androidx.camera.core.CameraSelector;
import androidx.camera.core.Preview;
import androidx.camera.core.SurfaceRequest;
import androidx.camera.lifecycle.ProcessCameraProvider;
import androidx.core.app.ActivityCompat;
import androidx.core.content.ContextCompat;

import com.google.androidgamesdk.GameActivity;
import com.google.common.util.concurrent.ListenableFuture;
import java.util.concurrent.ExecutionException;

public class MainActivity extends GameActivity {
    private TextureView textureView; // 使用 TextureView 替代 PreviewView
    private ProcessCameraProvider cameraProvider;
    private FrameLayout containerLayout;
    private void initCamera(){
        // 获取 GameActivity 的根视图
        ViewGroup rootView = (ViewGroup) getWindow().getDecorView();

        // 创建容器布局
        containerLayout = new FrameLayout(this);
        containerLayout.setLayoutParams(new ViewGroup.LayoutParams(
                ViewGroup.LayoutParams.MATCH_PARENT,
                ViewGroup.LayoutParams.MATCH_PARENT
        ));

        // 创建 TextureView 用于摄像头预览
        textureView = new TextureView(this);
        textureView.setLayoutParams(new ViewGroup.LayoutParams(
                ViewGroup.LayoutParams.MATCH_PARENT,
                ViewGroup.LayoutParams.MATCH_PARENT
        ));

        // 将 TextureView 添加到容器
        containerLayout.addView(textureView);

        // 将容器添加到根视图的底部（作为背景）
        //rootView.addView(containerLayout); // 添加到索引0（最底层）
        rootView.addView(containerLayout, 0);


        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: ");
    }

    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();

                Preview preview = new Preview.Builder().build();

                CameraSelector cameraSelector = new CameraSelector.Builder()
                        .requireLensFacing(CameraSelector.LENS_FACING_BACK)
                        .build();

                // 使用 TextureView 的 SurfaceTexture
                SurfaceTexture surfaceTexture = textureView.getSurfaceTexture();
                if (surfaceTexture != null) {
                    Surface surface = new Surface(surfaceTexture);
                    preview.setSurfaceProvider(new Preview.SurfaceProvider() {
                        @Override
                        public void onSurfaceRequested(@NonNull SurfaceRequest request) {
                            request.provideSurface(surface, ContextCompat.getMainExecutor(MainActivity.this),
                                    result -> {});
                        }
                    });
                }

                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 native void sendArgumentsToPlatform(String[] args);
}