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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