Which mode to use to draw on a bitmap

Question

Hi I am using bitmap and following code to erase arcs from bitmap

mPaint.setXfermode(new PorterDuffXfermode(Mode.CLEAR));

What should I do with mPaint now to make it draw on bitmap.

Answer 1

Make separate methods like

// To clear arcs

void turnEraserOn(){ 
    mPaint.setXfermode(new PorterDuffXfermode(Mode.CLEAR));
}

// To draw again

void turnEraserOff(){
    mPaint.setXfermode(null);
}

and call them whenever needed.