I am new to android,i prepared one painting view using finger with help of FingerPaint.java in Api Demo.It is working fine.
The same view contains one button(clear),
make a public function in your custom drawing class named as clearDrawing(); and write this:
mBitmap = null; mPath = null; mBitmap = Bitmap.createBitmap(480, 480, Bitmap.Config.ARGB_8888); mPath = new Path();
now call clearDrawing() to reset drawing control.