我使用此代码从前置摄像头录制，但是当摄像头开始录制时，录制器更改为后置摄像头（表面视图显示前置摄像头预览），这是我的代码：
public class MatchActivity extends Activity implements SurfaceHolder.Callback {
private static final String LOG_TAG = MainActivity.class.getCanonicalName();
View myButton;
MediaRecorder mediaRecorder;
SurfaceHolder surfaceHolder;
boolean recording;
private TextView mTimer;
private Camera mCamera;
TextView prepareid;
CountDownTimer countDownTimer;
String pathOfVideo;
TextView textmode;
ImageView imagemode;
boolean isRunning = false;
String PIC;
int ID;
operations op = new operations();
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_match);
SurfaceView myVideoView = (SurfaceView) findViewById(R.id.surface);
op.Localize();
recording = false;
mCamera = Camera.open(1);
mCamera.setDisplayOrientation(90);
mCamera.unlock();
mediaRecorder = new MediaRecorder();
mediaRecorder.setCamera(mCamera);
pathOfVideo=initMediaRecorder();
surfaceHolder = myVideoView.getHolder();
surfaceHolder.addCallback(this);
surfaceHolder = myVideoView.getHolder();
surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
myButton = (View) findViewById(R.id.Prepare);
myButton.setOnClickListener(StartVideo);
ImageView CorecctAnswer = (ImageView) findViewById(R.id.correctanswer);
CorecctAnswer.setOnClickListener(CorrectAnswer);
prepareid = (TextView) findViewById(R.id.prepareid);
mTimer = (TextView) findViewById(R.id.timer);
if (ContextCompat.checkSelfPermission(getApplicationContext(), android.Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(MatchActivity.this, new String[]{android.Manifest.permission.CAMERA}, 50);
}
}
private Button.OnClickListener StartVideo
= new Button.OnClickListener() {
@Override
public void onClick(final View arg0) {
myButton.setVisibility(View.GONE);
prepareid.setVisibility(View.GONE);
countDownTimer = new CountDownTimer(60 * 1000, 1000) {
@Override
public void onTick(long millisUntilFinished) {
mTimer.setText(String.valueOf(millisUntilFinished / 1000)+ " ثانیه ");
isRunning = true;
}
@Override
public void onFinish() {
isRunning= false;
if(camerastate)
stopvideo();
Intent intent = new Intent(MatchActivity.this, ResultPage.class);
Bundle b = new Bundle();
b.putString("PIC",PIC);
b.putString("PATH", pathOfVideo);
b.putString("Word", textmode.getText().toString());
b.putInt("Answer",0);
b.putInt("ID",ID);
intent.putExtras(b);
startActivity(intent);
finish();
}
};
startvideo();
}
};
public void stopvideo()
{
recording=false;
try {
mediaRecorder.stop();
mediaRecorder.reset();
finish();
} catch (Exception e) {
Log.e(LOG_TAG, "Failed to stop recorder", e);
}
mediaRecorder.release();
mediaRecorder = null;
if (mCamera != null) {
mCamera.release();
mCamera = null;
}
}
public void startvideo()
{
mCamera.release();
countDownTimer.start();
mediaRecorder.start();
recording = true;
}
@Override
public void surfaceChanged(SurfaceHolder arg0, int arg1, int arg2, int arg3) {
}
@Override
public void surfaceCreated(SurfaceHolder holder) {
if (mCamera != null) {
Camera.Parameters params = mCamera.getParameters();
mCamera.setParameters(params);
try {
mCamera.setPreviewDisplay(holder);
} catch (IOException e) {
e.printStackTrace();
}
mCamera.startPreview();
}
prepareMediaRecorder();
}
@Override
public void surfaceDestroyed(SurfaceHolder arg0) {
}
private String initMediaRecorder() {
mediaRecorder.setCamera(mCamera);
mediaRecorder.setAudioSource(MediaRecorder.AudioSource.DEFAULT);
mediaRecorder.setVideoSource(MediaRecorder.VideoSource.CAMERA);
mediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4);
mediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
mediaRecorder.setVideoEncoder(MediaRecorder.VideoEncoder.MPEG_4_SP);
CamcorderProfile camcorderProfile = CamcorderProfile.get(CamcorderProfile.QUALITY_LOW); //get your own profile
Camera.Parameters parameters = null;
if (mCamera.getParameters()!=null) {
parameters = mCamera.getParameters();
}
parameters.setPreviewSize(camcorderProfile.videoFrameWidth,camcorderProfile.videoFrameHeight);
mCamera.setParameters(parameters);
File file = new File(getExternalFilesDir(Environment.DIRECTORY_MOVIES),"hadskalme" + System.currentTimeMillis()+ ".mp4");
if (file.exists()) {
file.delete();
}
mediaRecorder.setOutputFile(file.getAbsolutePath());
mediaRecorder.setMaxDuration(90000); // Set max duration 90 sec.
mediaRecorder.setMaxFileSize(15000000); // Set max file size 15M
return String.valueOf(file.getAbsolutePath());
}
private void prepareMediaRecorder() {
mediaRecorder.setPreviewDisplay(surfaceHolder.getSurface());
try {
mediaRecorder.prepare();
} catch (IllegalStateException | IOException e) {
Log.e(LOG_TAG, " to prepare recorder", e);
}
}
}
我收到了什么错误：
W / AudioSystem：AudioFlinger服务器死了！ W / IMediaDeathNotifier：媒体服务器死了 E / MediaPlayer：错误（100,0） W / MediaMetadataRetriever：MediaMetadataRetriever服务器死了！ W / CameraBase：相机服务死了！
答案 0 :(得分：0)
public static Camera openFrontalCamera() {
Camera.CameraInfo cameraInfo = new Camera.CameraInfo();
for (int i = 0; i < Camera.getNumberOfCameras(); i++) {
Camera.getCameraInfo(i, cameraInfo);
if (Camera.CameraInfo.CAMERA_FACING_FRONT == cameraInfo.facing) {
return Camera.open(i);
}
}
return null;
}
代码中的用法
mCamera = openFrontalCamera();
if (mCamera != null) {
//continue flow
} else {
//no frontal camera available
}