我正在使用包含前置和后置摄像头的自定义录像机。 当我开始在后置相机中录制时，没有问题，当我开始在前置相机中录制时，相机的亮度降低。

我有摄像头切换按钮来更改前后摄像头

int currentCameraId;

reverseCamera.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

mCamera.stopPreview();

mCamera.release();

if (currentCameraId == Camera.CameraInfo.CAMERA_FACING_BACK) {

currentCameraId = Camera.CameraInfo.CAMERA_FACING_FRONT;

} else {

currentCameraId = Camera.CameraInfo.CAMERA_FACING_BACK;

}

mCamera = Camera.open(currentCameraId);

setCameraDisplayOrientation(UnlVideoActivity.this, currentCameraId, mCamera);

try {

mCamera.setPreviewDisplay(mHolder);

} catch (IOException e) {

e.printStackTrace();

}

mCamera.startPreview();

}

});

public void setCameraDisplayOrientation(Activity activity,

int cameraId, android.hardware.Camera camera) {

android.hardware.Camera.CameraInfo info =

new android.hardware.Camera.CameraInfo();

android.hardware.Camera.getCameraInfo(cameraId, info);

int rotation = activity.getWindowManager().getDefaultDisplay().getRotation();

int degrees = 0;

params.setRotation(rotation);

switch (rotation) {

case Surface.ROTATION_0:

Toast.makeText(UnlVideoActivity.this, "LAND", Toast.LENGTH_SHORT).show();

degrees = 0;

break;

case Surface.ROTATION_90:

Toast.makeText(UnlVideoActivity.this, "PORT", Toast.LENGTH_SHORT).show();

degrees = 90;

break;

case Surface.ROTATION_180:

degrees = 180;

break;

case Surface.ROTATION_270:

degrees = 270;

break;

}

int result;

if (info.facing == Camera.CameraInfo.CAMERA_FACING_FRONT) {

result = (info.orientation + degrees) % 360;

result = (360 - result) % 360; // compensate the mirror

} else { // back-facing

result = (info.orientation - degrees + 360) % 360;

}

camera.setDisplayOrientation(result);

camera.startPreview();

}

通过这种方式，当我开始记录亮度时，我便切换了前置摄像头。

记录代码

private boolean prepareMediaRecorder() {

mCamera = getCameraInstance();

mediaRecorder = new MediaRecorder();

mediaRecorder.setOrientationHint(orientationHint);

mCamera.unlock();

mediaRecorder.setPreviewDisplay(mHolder.getSurface());

mediaRecorder.setCamera(mCamera);

mediaRecorder.setAudioSource(MediaRecorder.AudioSource.CAMCORDER);

mediaRecorder.setVideoSource(MediaRecorder.VideoSource.CAMERA);

mediaRecorder.setProfile(CamcorderProfile.get(CamcorderProfile.QUALITY_HIGH));

mediaRecorder.setOutputFile("/sdcard/myvideo.mp4");

mediaRecorder.setMaxDuration(60000); // Set max duration 60 sec.

mediaRecorder.setMaxFileSize(5000000); // Set max file size 5M

mediaRecorder.setPreviewDisplay(mCameraSurfaceView.getHolder().getSurface());

try {

mediaRecorder.prepare();

} catch (IllegalStateException e) {

releaseMediaRecorder();

return false;

} catch (IOException e) {

releaseMediaRecorder();

return false;

}

return true;

}