Android Camera2 API 切换回 - 前置摄像头 [英] Android Camera2 API switch back - front cameras
问题描述
我正在创建一个使用新的 camera2 API 捕捉视频的自定义相机.
I'm creating a custom camera capturing videos with the new camera2 API.
我的代码受到 Google 此处提供的代码的强烈启发.我的相机预览有一个按钮,可以从后置摄像头切换到前置摄像头,然后从前置摄像头切换到后置摄像头.默认情况下,相机预览"活动使用后置相机启动.
My code is strongly inspired from the code provided by Google here. My camera preview has a button to switch from back to front camera and then from front to back camera. The "camera preview" activity is launched with the back camera by default.
出于某种原因,当我第一次点击切换/交换摄像头"按钮时,它应该会进入前置摄像头,但每次我再次点击时,开关/swap 不再起作用:预览(在前置摄像头上)会变淡一点,就像发生了什么事情一样,但它仍然保留在当前选择的(前置)摄像头上.
For some reason, when I click on the "switch/swap camera" button for the first time, it brings be to the front camera as it should, BUT everytime I click again, the switch/swap doesn't work anymore: the preview (on the front camera) fades a little bit, like if something is happening, but it remains on the currently selected (front) camera.
这是我的代码:
在 RecordVideoFragment
中,在 onViewCreated
中:
// Switch camera button
switchCameraButton = (ImageButton) view.findViewById(R.id.button_switch_camera);
// Listener for Switch cameras button
switchCameraButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
switchCameras();
}
});
这里是 switchCameras()
函数:
private void switchCameras() {
mCameraOpenCloseLock.release();
mCameraDevice.close();
CameraManager mCameraManager = (CameraManager) getActivity().getSystemService(Context.CAMERA_SERVICE);
try {
String mCameraId = mCameraManager.getCameraIdList()[0];
if (mCameraId.equals("0")) { // If currently on FRONT camera (0 = CameraCharacteristics.LENS_FACING_FRONT)
mCameraId = "1"; // switch to BACK camera (1 = CameraCharacteristics.LENS_FACING_BACK)
switchCameraButton.setImageResource(R.drawable.ic_camera_front);
} else { // If currently on BACK camera
mCameraId = "0"; // switch to front camera
switchCameraButton.setImageResource(R.drawable.ic_camera_back);
}
try {
if (ActivityCompat.checkSelfPermission(getActivity(), Manifest.permission.CAMERA)
== PackageManager.PERMISSION_GRANTED) {
mCameraManager.openCamera(mCameraId, mStateCallback, null);
} else {
requestVideoPermissions();
}
} catch (CameraAccessException e) {
e.printStackTrace();
}
} catch (CameraAccessException e) {
Toast.makeText(getActivity(), "Cannot access the camera.", Toast.LENGTH_SHORT).show();
getActivity().finish();
}
}
如果你对正在发生的事情有任何想法,那会救我.我一直在窃听这几天.非常感谢
If you have any idea on what's happening that would save me. I have been bugging on this for days. Thank you very much
推荐答案
你需要做的是引入新的变量:
What you need to do is introduce new variables:
public static final String CAMERA_FRONT = "1";
public static final String CAMERA_BACK = "0";
private String cameraId = CAMERA_BACK;
删除cameraId 局部变量来自 openCamera 方法.
public void switchCamera() {
if (cameraId.equals(CAMERA_FRONT)) {
cameraId = CAMERA_BACK;
closeCamera();
reopenCamera();
switchCameraButton.setImageResource(R.drawable.ic_camera_front);
} else if (cameraId.equals(CAMERA_BACK)) {
cameraId = CAMERA_FRONT;
closeCamera();
reopenCamera();
switchCameraButton.setImageResource(R.drawable.ic_camera_back);
}
}
public void reopenCamera() {
if (mTextureView.isAvailable()) {
openCamera(mTextureView.getWidth(), mTextureView.getHeight());
} else {
mTextureView.setSurfaceTextureListener(mSurfaceTextureListener);
}
}
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