Android :: Restart Video Preview After The SurfaceDestroyed()?
Jul 2, 2009
I have created a CapturePreview class and CameraManager class the following way:
CapturePreview:
CODE:...
The video preview works fine this way until the sub-activity starts in the main activity. When sub-activity starts the CaptureView.surfaceDestroyed(SurfaceHolder holder) is called and the video preview stops. Then when the sub-activity closes the CaptureView.surfaceCreated(SurfaceHolder holder) is executed, but the video preview doesn't start.
Does anyone know how to fix the problem in order to successfully restart video preview after surfaceDestroyed(SurfaceHolder holder) is executed?
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Jun 22, 2009
I have tried 1.5 video API. I could not make it work. It even can't do preview. Following is my code:
private boolean initializeVideo() { Log.v(TAG, "initializeVideo");
if(Common.mRecordedVideo!=null && Common.mRecordedVideo.exists ()) Common.mRecordedVideo.delete();
File sDir = Environment.getExternalStorageDirectory();
String baseDir = sDir + Common.BASE_DIR;
File sampleDir=new File(baseDir);
if(!sampleDir.canWrite()) // Workaround for broken sdcard support on the device.
sampleDir = new File("/sdcard/sdcard");
try { Common.mRecordedVideo = File.createTempFile(PREFIX, EXTENSION, sampleDir);
} catch(IOException e) { AlertDialog.Builder ab = new AlertDialog.Builder (VideoRecord.this);
ab.setTitle("Error"); ab.setMessage(" can't write audio data to storage");
ab.setIcon(R.drawable.error); ab.setNeutralButton("Close", new DialogInterface.OnClickListener()
{ public void onClick(DialogInterface dialog, int whichButton) { } } );
ab.show(); return false;
} Intent intent = getIntent(); releaseMediaRecorder();
if (mSurfaceHolder == null) { Log.v(TAG, "SurfaceHolder is null");
return false; } mMediaRecorder = new MediaRecorder();
mMediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
mMediaRecorder.setVideoSource (MediaRecorder.VideoSource.CAMERA);
mMediaRecorder.setOutputFormat (MediaRecorder.OutputFormat.THREE_GPP);
mMediaRecorder.setMaxDuration(MAX_RECORDING_DURATION_MS);
mMediaRecorder.setOutputFile (Common.mRecordedVideo.getAbsolutePath());
// Use the same frame rate for both, since internally
// if the frame rate is too large, it can cause camera to become
// unstable. We need to fix the MediaRecorder to disable the support
// of setting frame rate for now.
mMediaRecorder.setVideoFrameRate(20);
mMediaRecorder.setVideoSize(352,288);
mMediaRecorder.setVideoEncoder (MediaRecorder.VideoEncoder.H263);
mMediaRecorder.setPreviewDisplay(mSurfaceHolder.getSurface());
try { mMediaRecorder.prepare();
} catch (IOException exception) { Log.e(TAG, "prepare failed for " );
releaseMediaRecorder(); // TODO: add more exception handling logic here
return false; } mMediaRecorderRecording = false;
return true; } private void startVideoRecording() {
Log.v(TAG, "startVideoRecording"); if (!mMediaRecorderRecording) {
// Check mMediaRecorder to see whether it is initialized or not.
if (mMediaRecorder == null && initializeVideo() == false ) {
Log.e(TAG, "Initialize video (MediaRecorder) failed."); return;
} try { mMediaRecorder.setOnErrorListener(this);
mMediaRecorder.setOnInfoListener(this);
mMediaRecorder.start();
// Recording is now started } catch (RuntimeException e) {
Log.e(TAG, "Could not start media recorder. ", e); return;
} mMediaRecorderRecording = true;
mRecordingStartTime = SystemClock.uptimeMillis();
updateRecordingIndicator(true);
mRecordingTimeView.setText("");
mRecordingTimeView.setVisibility(View.VISIBLE);
mHandler.sendEmptyMessage(UPDATE_RECORD_TIME);
setScreenTimeoutInfinite();
} }
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Can anyone share or point me to working example of "video capture" with preview?
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The following is the overriden dispatchDraw in a subclass of SurfaceView. I'm trying to change the parameters of the Surface(getting only a subsection of the video preview.
CODE:......
Why does the above code not alter the dimensions of the SurfaceView at all?
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because prepare() fails, apparently because setPreviewDisplay() doesn't like not having a proper surface to attach to.
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CODE:......................
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CODE:............
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The example that comes with Android fills the screen. The obvious solution (that doesn't seem to be working) is to use my own SurfaceView (rather than the one they do in the example) and have it sitting in my XML. The code (beneath) doesn't crash and reports that it's firing up the camera... it just never renders on the screen.
I have no idea what I'm doing incorrectly. My guess is that it has something to do with the display thread never having the urge to redraw anything after it renders the initial screen, but I even tried adding a button and initiating the camera to render on the surface view upon button click, but that has not provoked it any further.
(most of this code is pulled directly out of the Android sample code, so, I'm sure it's correct. I'm just doing something wrong in how I pull my View in after the fact, I think).
CODE:........................
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