...
public class Kamera extends Activity implements Callback{
    SurfaceView mSurfaceView;
    Camera mCamera;
    boolean ontouchevent = false;
    
    @Override
    protected void onCreate(Bundle savedInstanceState){
        super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        setContentView(R.layout.camera_hardware);
        mSurfaceView = (SurfaceView) findViewById(R.id.sv_hardware_kamera);
        mSurfaceView.getHolder().addCallback(this);
        mSurfaceView.getHolder().setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        
        PictureCallback pc = new PictureCallback() {
            
            public void onPictureTaken(byte[] data, Camera camera) {
                try
                {
                    System.out.println("Bild bekommen. es ist " + data.length + " lang");
                    Main.byte_bild = data;
                    ontouchevent = false;
                    finish();
                }
                catch(Exception e)
                {
                    System.out.println(e.getStackTrace());
                }
            }
        };
        System.out.println("on touch event");
        if (!ontouchevent)
        {
            ontouchevent = true;
            mCamera.takePicture(null, null, pc);
        }
        return super.onTouchEvent(event);
    }

    public void surfaceChanged(SurfaceHolder holder, int format, int width,
            int height) {
...
    }

    public void surfaceCreated(SurfaceHolder holder) {
        mCamera = Camera.open();
        Parameters parameter = mCamera.getParameters();
        parameter.setJpegQuality(100);
        //parameter.setPictureSize(Main.picture_width, Main.picture_height);
        List<Camera.Size> s = mCamera.getParameters().getSupportedPictureSizes();
        Camera.Size best_size = null;
        for(Camera.Size ding : s)
        {
            if (best_size == null)
            {
                best_size = ding;
            }else
            {
                if(best_size.height < ding.height)
                {
                    best_size = ding;
                }
            }
        }
        Main.picture_height = best_size.height;
        Main.picture_width = best_size.width;
        System.out.println("Die beste Picture Qualität ist: " + best_size.width + "x" + best_size.height);
        parameter.setPictureSize(best_size.width, best_size.height);
        parameter.setPictureFormat(PixelFormat.JPEG);
        mCamera.setParameters(parameter);
        parameter = mCamera.getParameters();
        System.out.println(parameter.getPictureFormat());
        try {
            mCamera.setPreviewDisplay(holder);
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        
    }

    public void surfaceDestroyed(SurfaceHolder holder) {
...
    
    
}