android - Which mode to use to draw on a bitmap -

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Hi I am using bitmap and using code to erase arch by bitmap 

  mPaint.setXfermode (new portfidfoixform (mod.CLEAR));   
 Now what should I do with mPaint to draw it on bitmap?   
 
 
 create different ways like  
 // to clear the arcs  
  Turn on zero EraserOn () {mPaint.setXfermode (New PortfidxFormode (M.CLEAR)); }   
 // To draw again  
  Turn on zero EraserOff () {mPaint.setXfermode (null); }   
 And call them whenever they need.

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