rub image in canvas

I am using android 2.x and I have four bitmaps drawn on a canvas, now i want to replace "yahoo" image with some other image and that image's size is different than "yahoo" image. Now what i want is , i want to rub the yahoo image and replace it with the new one but in such a way that if i rub "yahoo" image then images that are laying in the background don't get disturbed or vanished.

here is the sample image

This sounds pretty simple to do....

on your ondraw function, you should just re-draw each bitmap, starting at the most bottom one to the top.

I dont know what do you mean by "rub", the only way I know how to do this is just to always re-draw each objects, and if you dont want Yahoo to show, just replace Yahoo bitmap with the new Bitmap that you wish to replace it.