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.util.Log;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.Toast;

import androidx.annotation.NonNull;
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 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;

public class MainActivity extends GameActivity {
    private PreviewView previewView;
    private ProcessCameraProvider cameraProvider;
    private void initCamera(){
        // 创建摄像头预览视图
        previewView = new PreviewView(this);
        previewView.setImplementationMode(PreviewView.ImplementationMode.COMPATIBLE);
        previewView.setScaleType(PreviewView.ScaleType.FILL_CENTER);

        addContentView(previewView, new ViewGroup.LayoutParams(
                ViewGroup.LayoutParams.MATCH_PARENT,
                ViewGroup.LayoutParams.MATCH_PARENT
        ));

        bringVulkanToFront();

        if (hasCameraPermission()) {
            startCamera();
        } else {
            requestCameraPermission();
        }
    }

    private void bringVulkanToFront() {
        // 获取窗口的根视图
        View rootView = getWindow().getDecorView();
        if (rootView instanceof ViewGroup) {
            ViewGroup rootGroup = (ViewGroup) rootView;

            for (int i = rootGroup.getChildCount() - 1; i >= 0; i--) {
                View child = rootGroup.getChildAt(i);
                if (child != previewView) {
                    child.bringToFront();
                    child.setBackgroundColor(Color.TRANSPARENT);
                    break;
                }
            }
        }
    }


    @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();

                preview.setSurfaceProvider(previewView.getSurfaceProvider());

                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);
}