次のスタックトレースを取得しました
04-17 12:11:56.378: D/ATRecorder(10379): com.htc.autotest.dlib.RecordEngine in loader dalvik.system.DexClassLoader@40528b78
04-17 12:11:56.408: D/WindowManagerImpl(10379): addView, new view, mViews[0]: com.android.internal.policy.impl.PhoneWindow$DecorView@40520738
04-17 12:11:56.428: D/WindowManagerImpl(10379): addView, new view, mViews[1]: android.widget.LinearLayout@40525d00
04-17 12:11:56.438: D/WindowManagerImpl(10379): finishRemoveViewLocked, mViews[1]: android.widget.LinearLayout@40525d00
04-17 12:11:56.718: D/TAG(10379): Error setting camera preview: setPreviewDisplay failed
04-17 12:11:56.748: D/TAG(10379): Error starting camera preview: setPreviewDisplay failed
04-17 12:12:07.558: D/View(10379): onTouchEvent: viewFlags: 0x18004001
04-17 12:12:07.568: D/View(10379): onTouchEvent: isFocusable: true, isFocusableInTouchMode: false, isFocused: false; focusTaken: false
04-17 12:12:07.588: V/MediaRecorderJNI(10379): start
04-17 12:12:07.598: V/MediaRecorderJNI(10379): getMediaRecorder E
04-17 12:12:11.632: V/MediaRecorderJNI(10379): process_media_recorder_call
04-17 12:12:11.642: W/IMediaDeathNotifier(10379): media server died
04-17 12:12:11.642: V/MediaRecorderJNI(10379): JNIMediaRecorderListener::notify
04-17 12:12:11.642: V/MediaRecorderJNI(10379): notify msgType 0x1, ext1 0x64
04-17 12:12:11.642: W/Camera(10379): ICamera died
04-17 12:12:11.642: W/Camera(10379): Camera server died!
04-17 12:12:11.702: E/Camera(10379): Error 100
私のコードは
public class VideoDemoActivity extends Activity {
/** Called when the activity is first created. */
private Camera mCamera;
private CameraPreview mPreview;
private Button btnCapture,btnStop;
private MediaRecorder mMediaRecorder;
FrameLayout preview;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
initialize();
if (!checkCameraHardware(this)) {
Toast.makeText(this, "Camera not found", Toast.LENGTH_SHORT).show();
finish();
} else {
Toast.makeText(this, "Camera found", Toast.LENGTH_SHORT).show();
}
mCamera = getCameraInstance();
mPreview = new CameraPreview(this, mCamera);
preview.addView(mPreview);
System.out.println(prepareVideoRecorder());
btnCapture.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
try {
mMediaRecorder.start();
} catch (IllegalStateException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
});
btnStop.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
mMediaRecorder.stop();
}
});
}
private void initialize() {
// TODO Auto-generated method stub
preview = (FrameLayout) findViewById(R.id.camera_preview);
btnCapture = (Button) findViewById(R.id.button_capture);
btnStop = (Button) findViewById(R.id.button_stop);
}
public Camera getCameraInstance(){
Camera c = null;
try {
c = Camera.open(); // attempt to get a Camera instance
}
catch (Exception e){
e.printStackTrace();
}
return c; // returns null if camera is unavailable
}
private boolean checkCameraHardware(Context context) {
if (context.getPackageManager().hasSystemFeature(PackageManager.FEATURE_CAMERA)){
// this device has a camera
return true;
} else {
// no camera on this device
return false;
}
}
@Override
protected void onPause() {
// TODO Auto-generated method stub
super.onPause();
releaseMediaRecorder(); // if you are using MediaRecorder, release it first
releaseCamera(); // release the camera immediately on pause event
}
private boolean prepareVideoRecorder(){
mMediaRecorder = new MediaRecorder();
mCamera.unlock();
mMediaRecorder.setCamera(mCamera);
mMediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
mMediaRecorder.setVideoSource(MediaRecorder.VideoSource.DEFAULT);
mMediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
mMediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
mMediaRecorder.setVideoEncoder(MediaRecorder.VideoEncoder.MPEG_4_SP);
mMediaRecorder.setOutputFile(getOutputMediaFile().toString());
try
{
mMediaRecorder.prepare();
} catch (IllegalStateException e) {
e.printStackTrace();
releaseMediaRecorder();
return false;
} catch (IOException e) {
e.printStackTrace();
releaseMediaRecorder();
return false;
}
return true;
}
private void releaseMediaRecorder(){
if (mMediaRecorder != null) {
mMediaRecorder.reset(); // clear recorder configuration
mMediaRecorder.release(); // release the recorder object
mMediaRecorder = null;
mCamera.lock(); // lock camera for later use
}
}
private void releaseCamera(){
if (mCamera != null){
mCamera.release(); // release the camera for other applications
mCamera = null;
}
}
private static File getOutputMediaFile(){
File mediaFile = new File(Environment.getExternalStorageDirectory()+"/video.mp4");
return mediaFile;
}
}
だから私がこの問題を解決するのを手伝ってください..私がメソッドを削除した場合
prepareVideoRecorder（）
次に、カメラを適切にプレビューします。ただし、このメソッドの実行後、プレビューは表示されません。失敗します。
mMediaRecorder.start（）;
嘆願は私を助けてくれます。