Hi, I believe that recording video while in the background is not supported.
Trying to force this to happen is likely to result in random, undesirable
behavior. Note that you have to go to work to even get to that point
because when the user leaves your app your window's surface as well as the
surface associated with a SurfaceView will be destroyed by the framework.
There is not supported way to keep these around.
On Sat, Apr 9, 2011 at 6:47 AM, lyrical.mas...@hotmail.com <
lyrical.mas...@hotmail.com> wrote:
> I'm creating an android application which act like a car blackbox, but
> i run into problem as soon i start doing it, maybe partly because i'm
> new to android/java but i've given 6more weeks to develop this
> app... :'(
>
> But get back to my problem i had my service run the video recording
> processes in the background so i should be able to leave the app for a
> while and come back to the Video recording GUI with the surfaceview
> but my application was force to close when i return to the app. So is
> the problem related to onResume() method or something else? If its yes
> what i should do in order to get my application GUI to return to the
> video recording surfaceview and still running the background recording
> using the service rather than giving me an error?
>
> Can someone please help me, i've really exhausted all ideas and to
> make it worse i'm new to java/android thus making me very headache, i
> really need some experience programmer to help me solve the
> problem...
>
> public class CameraTest extends Activity implements
> SurfaceHolder.Callback {
>
> private static final String TAG = "Exception";
>
> public static SurfaceView surfaceView;
> public static SurfaceHolder surfaceHolder;
> public static Camera MainCamera;
> public static boolean previewRunning;
>
> @Override
> public void onCreate(Bundle savedInstanceState) {
> super.onCreate(savedInstanceState);
> setContentView(R.layout.main);
>
> surfaceView = (SurfaceView)findViewById(R.id.surface_camera);
> surfaceHolder = surfaceView.getHolder();
> surfaceHolder.addCallback(this);
>
>
> surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
>
> Button btnStart = (Button) findViewById(R.id.button4);
> btnStart.setOnClickListener(new View.OnClickListener()
> {
> public void onClick(View v)
> {
> startService(new Intent(getApplicationContext(),
> ServiceRecording.class));
> }
> });
>
> Button btnStop = (Button) findViewById(R.id.button5);
> btnStop.setOnClickListener(new View.OnClickListener()
> {
> public void onClick(View v)
> {
> stopService(new Intent(getApplicationContext(),
> ServiceRecording.class));
> }
> });
> }
>
> @Override
> public void surfaceCreated(SurfaceHolder holder) {
> MainCamera = Camera.open();
> if (MainCamera != null) {
> Camera.Parameters params = MainCamera.getParameters();
> MainCamera.setParameters(params);
> }
> else {
> Toast.makeText(getApplicationContext(), "Camera not
> available!",
> Toast.LENGTH_LONG).show();
> finish();
> }
> }
>
> @Override
> public void surfaceChanged(SurfaceHolder holder, int format, int
> width, int height) {
> if (previewRunning) {
> MainCamera.stopPreview();
> }
>
> Camera.Parameters p = MainCamera.getParameters();
> p.setPreviewSize(320, 240);
> p.setPreviewFormat(PixelFormat.JPEG);
> MainCamera.setParameters(p);
>
> try {
> MainCamera.setPreviewDisplay(holder);
> MainCamera.startPreview();
> previewRunning = true;
> }
> catch (IOException e) {
> Log.e(TAG,e.getMessage());
> e.printStackTrace();
> }
> }
>
> @Override
> public void onResume(){
> super.onResume();
>
> }
>
> @Override
> public void surfaceDestroyed(SurfaceHolder holder){
> MainCamera.stopPreview();
> previewRunning = false;
> MainCamera.release();
> }
> }
>
> My RecordingService.java Service file
> public class ServiceRecording extends Service {
>
> @Override
> public IBinder onBind(Intent intent) {
> // TODO Auto-generated method stub
> return null;
> }
>
> private SurfaceView surfaceView;
> private SurfaceHolder surfaceHolder;
> public static Camera ServiceCamera;
> private boolean RecordingStatus;
> private MediaRecorder mediaRecorder;
> private final int maxDurationInMs = 20000;
>
> private static final String TAG = "Exception";
>
> @Override
> public void onCreate() {
> super.onCreate();
>
> RecordingStatus = false;
> ServiceCamera = CameraTest.MainCamera;
> surfaceView = CameraTest.surfaceView;
> surfaceHolder = CameraTest.surfaceHolder;
> }
>
> @Override
> public int onStartCommand(Intent intent, int flags, int startId) {
> super.onStartCommand(intent, flags, startId);
> if (RecordingStatus == false)
> startRecording();
>
> return START_STICKY;
> }
>
> @Override
> public void onDestroy() {
> super.onDestroy();
>
> stopRecording();
> RecordingStatus = false;
> }
>
> public boolean startRecording(){
> try {
> Toast.makeText(getBaseContext(), "Recording
> Started",
> Toast.LENGTH_SHORT).show();
> try{
> ServiceCamera.unlock();
> }
> catch(Exception e){
>
> ServiceCamera.reconnect();
> }
>
> mediaRecorder = new MediaRecorder();
>
> mediaRecorder.setCamera(ServiceCamera);
>
>
> mediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
>
>
> mediaRecorder.setVideoSource(MediaRecorder.VideoSource.CAMERA);
>
>
> mediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.DEFAULT);
>
> mediaRecorder.setMaxDuration(maxDurationInMs);
>
>
> mediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.DEFAULT);
>
>
> mediaRecorder.setVideoEncoder(MediaRecorder.VideoEncoder.DEFAULT);
>
> //
> mediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.DEFAULT);
> DateFormat dateFormat = new
> SimpleDateFormat("yyyy-MM-dd
> HH_mm_ss");
> Date date = new Date();
> File directory = new
> File(Environment.getExternalStorageDirectory() + "/VideoList");
>
> if(!(directory.exists()))
> directory.mkdir();
>
> File FileSaved = new
> File(Environment.getExternalStorageDirectory() + "/VideoList",
> dateFormat.format(date) + ".3gp");
>
> mediaRecorder.setOutputFile(FileSaved.getPath());
>
>
> mediaRecorder.setVideoSize(surfaceView.getWidth(),surfaceView.getHeight());
>
>
> //mediaRecorder.setVideoFrameRate(videoFramesPerSecond);
>
>
> mediaRecorder.setPreviewDisplay(surfaceHolder.getSurface());
>
> mediaRecorder.prepare();
> mediaRecorder.start();
>
> RecordingStatus = true;
>
> return true;
> }
>
> catch (IllegalStateException e) {
> Log.d(TAG,e.getMessage());
> e.printStackTrace();
> return false;
> }
> catch (IOException e) {
> Log.d(TAG,e.getMessage());
> e.printStackTrace();
> return false;
> }
> }
>
> public void stopRecording() {
> Toast.makeText(getBaseContext(), "Recording Stopped",
> Toast.LENGTH_SHORT).show();
> mediaRecorder.stop();
>
> try {
> ServiceCamera.reconnect();
> } catch (IOException e) {
> e.printStackTrace();
> }
> RecordingStatus = false;
> }
> }
>
> --
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--
Dianne Hackborn
Android framework engineer
hack...@android.com
Note: please don't send private questions to me, as I don't have time to
provide private support, and so won't reply to such e-mails. All such
questions should be posted on public forums, where I and others can see and
answer them.
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