Displaying A Bitmap On Canvas In Surfaceview

I am trying to develop an android application to display a zoom-able, pan-able map, (which is just a bitmap image), that also allows the user to click on certain points on the map.

Solution 1:

Your piece of code is not really correct.

Usualy if you want to do this kind if things you need to create your own custom view (either by inheriting View or SurfaceView). In your View subclass you need to override method onDraw(Canvas) and draw your bitmap on canvas by using one of canvas methods.

To make it pannable and pinch-zoomable you need to use Scroller and ScaleGestureDetector classes. Usually panning or scaling is done by applying affine transformations to a canvas by using it's methods (rotate, scale, translate).

Difference between SurfaceView and View is that in SurfaceView you can draw directly from separate thread, which means you can organize sort of rendering loop there and draw from it. It is good for simple games and animation effects. I believe, for purpose of drawing a bitmap this is overkill and much simpler to subclass View.

I'd start with this and this, if I were you.