我只想在textureView中显示相机预览.

在纵向模式下它看起来很好但在横向模式下它顺时针旋转90度.

我知道这样的事情可以解决这个问题：

private static final SparseIntArray ORIENTATIONS = new SparseIntArray();

static {

ORIENTATIONS.append(Surface.ROTATION_0, 90);

ORIENTATIONS.append(Surface.ROTATION_90, 0);

ORIENTATIONS.append(Surface.ROTATION_180, 270);

ORIENTATIONS.append(Surface.ROTATION_270, 180);

}

我不知道在哪里打电话.你有什么建议吗？

这是我的代码：

private TextureView textureView;

private static final String TAG = "AndroidCameraApi";

private String cameraId;

protected CameraDevice cameraDevice;

protected CameraCaptureSession cameraCaptureSessions;

protected CaptureRequest captureRequest;

private static final int REQUEST_CAMERA_PERMISSION = 200;

private Size imageDimension;

protected CaptureRequest.Builder captureRequestBuilder;

private Handler mBackgroundHandler;

private HandlerThread mBackgroundThread;

private ImageReader imageReader;

private static final SparseIntArray ORIENTATIONS = new SparseIntArray();

static {

ORIENTATIONS.append(Surface.ROTATION_0, 90);

ORIENTATIONS.append(Surface.ROTATION_90, 0);

ORIENTATIONS.append(Surface.ROTATION_180, 270);

ORIENTATIONS.append(Surface.ROTATION_270, 180);

}

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_photo);

textureView = (TextureView) findViewById(R.id.texturePhoto);

assert textureView != null;

textureView.setSurfaceTextureListener(textureListener);

}

TextureView.SurfaceTextureListener textureListener = new TextureView.SurfaceTextureListener() {

@Override

public void onSurfaceTextureAvailable(SurfaceTexture surface, int width, int height) {

//open your camera here

openCamera();

}

@Override

public void onSurfaceTextureSizeChanged(SurfaceTexture surface, int width, int height) {

// Transform you image captured size according to the surface width and height

}

@Override

public boolean onSurfaceTextureDestroyed(SurfaceTexture surface) {

return false;

}

@Override

public void onSurfaceTextureUpdated(SurfaceTexture surface) {

}

};

private void openCamera() {

CameraManager manager = (CameraManager) getSystemService(Context.CAMERA_SERVICE);

Log.e(TAG, "is camera open");

try {

cameraId = manager.getCameraIdList()[0];

CameraCharacteristics characteristics = manager.getCameraCharacteristics(cameraId);

StreamConfigurationMap map = characteristics.get(CameraCharacteristics.SCALER_STREAM_CONFIGURATION_MAP);

assert map != null;

imageDimension = map.getOutputSizes(SurfaceTexture.class)[0];

// Add permission for camera and let user grant the permission

if (ActivityCompat.checkSelfPermission(this, Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {

ActivityCompat.requestPermissions(PhotoActivty.this, new String[]{Manifest.permission.CAMERA, Manifest.permission.WRITE_EXTERNAL_STORAGE}, REQUEST_CAMERA_PERMISSION);

return;

}

manager.openCamera(cameraId, stateCallback, null);

} catch (CameraAccessException e) {

e.printStackTrace();

}

Log.e(TAG, "openCamera X");

}

private final CameraDevice.StateCallback stateCallback = new CameraDevice.StateCallback() {

@Override

public void onOpened(CameraDevice camera) {

//This is called when the camera is open

Log.e(TAG, "onOpened");

cameraDevice = camera;

createCameraPreview();

}

@Override

public void onDisconnected(CameraDevice camera) {

cameraDevice.close();

}

@Override

public void onError(CameraDevice camera, int error) {

cameraDevice.close();

cameraDevice = null;

}

};

protected void createCameraPreview() {

try {

SurfaceTexture texture = textureView.getSurfaceTexture();

assert texture != null;

texture.setDefaultBufferSize(imageDimension.getWidth(), imageDimension.getHeight());

Surface surface = new Surface(texture);

captureRequestBuilder = cameraDevice.createCaptureRequest(CameraDevice.TEMPLATE_PREVIEW);

captureRequestBuilder.addTarget(surface);

cameraDevice.createCaptureSession(Arrays.asList(surface), new CameraCaptureSession.StateCallback(){

@Override

public void onConfigured(@NonNull CameraCaptureSession cameraCaptureSession) {

//The camera is already closed

if (null == cameraDevice) {

return;

}

// When the session is ready, we start displaying the preview.

cameraCaptureSessions = cameraCaptureSession;

updatePreview();

}

@Override

public void onConfigureFailed(@NonNull CameraCaptureSession cameraCaptureSession) {

Toast.makeText(PhotoActivty.this, "Configuration change", Toast.LENGTH_SHORT).show();

}

}, null);

} catch (CameraAccessException e) {

e.printStackTrace();

}

}

protected void updatePreview() {

if(null == cameraDevice) {

Log.e(TAG, "updatePreview error, return");

}

captureRequestBuilder.set(CaptureRequest.CONTROL_MODE, CameraMetadata.CONTROL_MODE_AUTO);

try {

cameraCaptureSessions.setRepeatingRequest(captureRequestBuilder.build(), null, mBackgroundHandler);

} catch (CameraAccessException e) {

e.printStackTrace();

}

}

private void closeCamera() {

if (null != cameraDevice) {

cameraDevice.close();

cameraDevice = null;

}

if (null != imageReader) {

imageReader.close();

imageReader = null;

}

}