title: Eraser function doesn't work properly
body: <p>I am new to android and i have problem in my painting application.When user want to delete or erase some already painted stuff ,by using below mentioned method i achieved the clearness but during clear it shows dark black lines whenever this function get called. I dont want to show that black lines, I want that ,Simple just like our real eraser works. </p>
  
  <p><strong><code>mPaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.CLEAR));</code></strong></p>
  
  <p>Please help me out.
  Hope anybody has the answer for the above.
  Thanks in advance. </p>