How to capture photo automatically in android phone?

Question

I have developed an android application. In that i have used front facing camera functionality. Its working fine but I need to auto capture. i.e. without click shutter butto

Answer 1

    public int intPicTaken;


    // setPreviewCallback on the camera, wait intil intPicTaken increments to 10, then take the picture
    cam.setPreviewCallback(prevCallBack);

    public Camera.PreviewCallback prevCallBack = new Camera.PreviewCallback() {
        @Override
        public void onPreviewFrame(byte[] data, Camera camera) {
            intPicTaken++;
            try {
                if(intPicTaken == 10) {
                doTakePicture();
                }
            } catch (Exception e) {
                System.out.println("onPreviewFrame: " + e.toString());
            }
        }
    };

    public Camera.PictureCallback mPicture = new Camera.PictureCallback() {
        @Override
        public void onPictureTaken(byte[] data, Camera camera) {
            System.out.println("PictureCallback onPictureTaken");
            try {

                BitmapFactory.Options options = new BitmapFactory.Options();
                options.inSampleSize = 1;
                Bitmap picture = BitmapFactory.decodeByteArray(data, 0, data.length, options);
                ByteArrayOutputStream baos = new ByteArrayOutputStream();
                picture.compress(Bitmap.CompressFormat.JPEG, 100, baos);
                baos.close();
                System.out.println("PictureCallback onPictureTaken done");
                cam.release();
                saveFile(picture);
            } catch (Exception e) {
                System.out.println("onPictureTaken: " + e.toString());
            }
        }
    };

    // take the picture
    public void doTakePicture() {
        try {

            cam.stopPreview();
            cam.takePicture(null, null, mPicture, mPicture);
        } catch(Exception e){
            System.out.println("doTakePicture: " + e.toString());
        }
    }

    // saving the file to gallery 
    public void saveFile(Bitmap bitmap) {
        String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
        File mediaStorageDir = Environment.getExternalStorageDirectory();
        if (! mediaStorageDir.exists()){
            if (! mediaStorageDir.mkdirs()){
                System.out.println("saveFile: failed to create directory");
                return;
            }
        }
        try {
            String saved = MediaStore.Images.Media.insertImage(this.getContentResolver(), bitmap, "title", "description");
            Uri sdCardUri = Uri.parse("file://" + Environment.getExternalStorageDirectory());
            sendBroadcast(new Intent(Intent.ACTION_MEDIA_MOUNTED, sdCardUri));
            System.out.println("file saved");
        } catch (Exception e) {
            System.out.println("saveFile: " + e.toString());
            e.printStackTrace();
        }
    }