Draw Rectangle on SurfaceView

Question

I would like to know how to draw a rectangle in specific position and size.

I tried a couple of trials and examples here and on web, but nothing worked for me.

I

Answer 1

Ok, Thanks to fadden I found the easiest solution(at least for me).

First I created another Surface view and my XML file look like this:

And than I'm created another holder for the new surface, this is a part of my java code:

protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_video_capture);
        // Create first surface with his holder(holder)
        cameraView = (SurfaceView)findViewById(R.id.CameraView);
        cameraView.setOnTouchListener(onTouchListner);

        holder = cameraView.getHolder();
        holder.addCallback(this);
        holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);

        // Create second surface with another holder (holderTransparent)
        transparentView = (SurfaceView)findViewById(R.id.TransparentView);

        holderTransparent = transparentView.getHolder();
        holderTransparent.setFormat(PixelFormat.TRANSPARENT);
        holderTransparent.addCallback(callBack); 
        holderTransparent.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
    }

At last I implement a method called 'DrawFocusRect'

private void DrawFocusRect(float RectLeft, float RectTop, float RectRight, float RectBottom, int color)
{

    canvas = holderTransparent.lockCanvas();
    canvas.drawColor(0,Mode.CLEAR);
    //border's properties
    paint = new Paint();
    paint.setStyle(Paint.Style.STROKE);
    paint.setColor(color);
    paint.setStrokeWidth(3);
    canvas.drawRect(RectLeft, RectTop, RectRight, RectBottom, paint);


    holderTransparent.unlockCanvasAndPost(canvas);
}

As you can see, I clear the canvas every time, if I don't do this, the surface will display in addition more rectangles on each others.

This is how I call to this method from a 'OnTouchListener' event:

OnTouchListener onTouchListner = new OnTouchListener() {

        @Override
        public boolean onTouch(View v, MotionEvent event) {
                    RectLeft = event.getX() - 100;
                    RectTop = event.getY() - 100 ;
                    RectRight = event.getX() + 100;
                    RectBottom = event.getY() + 100;
                    DrawFocusRect(RectLeft , RectTop , RectRight , RectBottom , Color.BLUE);
             }
         };

Hope this would be helpfull for someone else.