I\'ve added three different bitmap
to one ImageView
as shown in picture below. But the problem is that I cannot edit it after the
here is a link for source example of how to mask image
https://github.com/hotveryspicy/MaskImage
ref from this question
Masking(crop) image in frame
EDIT
for individual zoom in and zoom out you want these three bitmaps in different layout (you need to make custom image view ) so try below URL that describe how to make your own custom layout (image view in triangle shape) etc.
https://github.com/thecodepath/android_guides/wiki/Defining-Custom-Views