[Android Software Development] imso:
Question 1: Presumingly i wanted to allocate only 1GB of space to store my videos in a particular self declared directory how should i do it?

Question 2: And i wanted my directory to capped at 1GB after which how is it going to auto-delete the oldest video file in that directory once its about to reach 1GB?

Sorry i'm kinna new in java and android and currently creating an car blackbox app can someone help me... Thanks

This is what I have tried so far can someone tell me how should i implement the above function into my mainActivity:

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

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;
}
}