How to implemement undo features in painting application in Android?

Question

i want to do undo features in in my application.. for this i searched i net found that take arraylist of x,y points which i have done below code i am unable for undo the drawing

Answer 1

Hey I have used a kind of trick to remove the black line.In my erase button, I have set the color to white, instead of using XferMode..

  if(erase){
    paintColor = Color.parseColor(newColor);
    drawPaint.setColor(paintColor);
    }