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Apps Why can't my GUI return back to recording mode despite having service? Someone HELP...

I

imso

Member
Hi i'm new to android so that's why i come to find help... Hi an introduction to the app i'm doing here, i'm actually doing an car blackbox app..

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 my ideas and really need some experience programmer to help me solve the problem... :confused:
Code: 
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 camera;
   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) {
       camera = Camera.open();
       if (camera != null) {
          Camera.Parameters params = camera.getParameters();
          camera.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) {
          camera.stopPreview();
       }
       
       Camera.Parameters p = camera.getParameters();
       p.setPreviewSize(320, 240);
       p.setPreviewFormat(PixelFormat.JPEG);
       camera.setParameters(p);
       
       try {
             camera.setPreviewDisplay(holder);
             camera.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){
          camera.stopPreview();
          previewRunning = false;
          camera.release();
    }
}
My RecordingService.java Service file
Code: 
public class ServiceRecording extends Service {

   @Override
   public IBinder onBind(Intent intent) {
      // TODO Auto-generated method stub
      return null;
   }
   
   private SurfaceView surfaceView;
   private SurfaceHolder surfaceHolder;
   private Camera camera;
   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;
       camera = CameraTest.camera;
       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();
       //camera.stopPreview();
       recordingStatus = false;
       //camera.release();
    }   
    
    public boolean startRecording(){
       try {
             Toast.makeText(getBaseContext(), "Recording Started", Toast.LENGTH_SHORT).show();
             try{
                camera.unlock();
             }
             catch(Exception e){
                
                camera.reconnect();   
             }
             
             mediaRecorder = new MediaRecorder();
             
             mediaRecorder.setCamera(camera);
             
             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 {
         camera.reconnect();
      } catch (IOException e) {
         // TODO Auto-generated catch block
         e.printStackTrace();
      }
       recordingStatus = false;
    }
}
 
what stack trace are you getting when the program force finishes? I am not sure but there is a possibility that your camera == null when you resume because your surfaceholder has been destroyed and the appropriate callback is generated. Do something like this (if stack trace is a pain for you - it is for me..)
Code: 
    @Override
    public void onResume(){
       super.onResume();
       // TODO remove this when no longer needed.
       if(camera == null){
            Toast.makeText(getBaseContext(), "No camera!", Toast.LENGTH_SHORT).show();
       }       
    }
 
I've presume after running the ServiceRecording file in the background, i wanted to retrieve the camera view instance back to the surfaceview that's why the phone force the shut down.. Now i think i need to recreate the surfaceCreated or something, i've not so sure sorry i'm not a really good in android programming yet.. Can you help me please, i'm really at a lost on how do i retrieving back my camera surfaceview instead of having error...
 
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