zooming - Camera2 API 缩放相机预览

Question

我正在使用 Camera2 API 来显示相机预览。以下代码工作正常。但我希望相机在预览开始时放大到最大。我必须将哪些代码添加到我的 MainActivity？我已阅读问题Camera zoom setting using Camera2 API。但我无法为我使用它。主要活动代码：

@Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        myTextrureView = findViewById(R.id.textureView);
        myCameraManager = (CameraManager) getSystemService(CAMERA_SERVICE);
        openCamera();
    }
    private CameraDevice.StateCallback myStateCallBack = new CameraDevice.StateCallback() {
        @Override
        public void onOpened(@NonNull CameraDevice camera) {
            myCameraDevice = camera;
        }
        @Override
        public void onDisconnected(@NonNull CameraDevice camera) {
            myCameraDevice.close();
        }
        @Override
        public void onError(@NonNull CameraDevice camera, int error) {
            myCameraDevice.close();
            myCameraDevice = null;
        }
    };
    private void openCamera() {
        try {
            myCameraID = myCameraManager.getCameraIdList()[0];
            ActivityCompat.requestPermissions(MainActivity.this, new String[]{Manifest.permission.CAMERA, Manifest.permission.WRITE_EXTERNAL_STORAGE}, PackageManager.PERMISSION_GRANTED);
            if (ActivityCompat.checkSelfPermission(this, Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) {
                return;
            }
            myCameraManager.openCamera(myCameraID, myStateCallBack, null);
        }
        catch (Exception e){
            e.printStackTrace();
        }
    }
    public void cameraPreview(View view){
        SurfaceTexture mySurfaceTexture = myTextrureView.getSurfaceTexture();
        Surface mySurface = new Surface(mySurfaceTexture);
        try {
            myCaptureRequestBuilder = myCameraDevice.createCaptureRequest(CameraDevice.TEMPLATE_PREVIEW);
            myCaptureRequestBuilder.addTarget(mySurface);
            myCameraDevice.createCaptureSession(Arrays.asList(mySurface), new CameraCaptureSession.StateCallback() {
                        @Override
                        public void onConfigured(@NonNull CameraCaptureSession session) {
                            myCameraCaptureSession = session;
                            myCaptureRequestBuilder.set(CaptureRequest.CONTROL_MODE, CameraMetadata.CONTROL_MODE_AUTO);
                            try {
                                myCameraCaptureSession.setRepeatingRequest(myCaptureRequestBuilder.build(), null, null);
                            } catch (CameraAccessException e) {
                                e.printStackTrace();
                            }
                        }
                        @Override
                        public void onConfigureFailed(@NonNull CameraCaptureSession session) {
                        }
                    }, null
            );
        } catch (CameraAccessException e) {
            e.printStackTrace();
        }
    }

标签： zoomingpreviewandroid-camera2