How to make Canvas draw area transparent in android?

android, canvas, image, transparent

Solution

I got the output by this

 public Panel(Context context, AttributeSet attrs) { 
    super(context, attrs); 
    this.setBackgroundColor(Color.TRANSPARENT);                 
    this.setZOrderOnTop(true); //necessary                
    getHolder().setFormat(PixelFormat.TRANSPARENT); 
    getHolder().addCallback(this); 
    mThread = new ViewThread(this); 

}

Problem

I would like to make Canvas area transparent because I would like to add an Image behind it so that Canvas actions happen above the image.My code for the canvas is here ``` public class Panel extends SurfaceView implements SurfaceHolder.Callback { private ViewThread mThread; private ArrayList<Element> mElements = new ArrayList<Element>(); public Panel(Context context, AttributeSet attrs) { super(context, attrs); getHolder().addCallback(this); mThread = new ViewThread(this); } public void doDraw(Canvas canvas) { canvas.drawColor(Color.TRANSPARENT); synchronized (mElements) { for (Element element : mElements) { element.doDraw(canvas); } } } @Override public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) { // TODO Auto-generated method stub } @Override public void surfaceCreated(SurfaceHolder holder) { if (!mThread.isAlive()) { mThread = new ViewThread(this); mThread.setRunning(true); mThread.start(); } } @Override public void surfaceDestroyed(SurfaceHolder holder) { if (mThread.isAlive()) { mThread.setRunning(false); } } @Override public boolean onTouchEvent(MotionEvent event) { synchronized (mElements) { mElements.add(new Element(getResources(), (int) event.getX(), (int) event.getY())); } return super.onTouchEvent(event); } ``` } How to achieve it, any snippets on it will be very much helpful.Thanks

Original source