Here you can find the source of drawableToBitmap(Drawable drawable)
public static Bitmap drawableToBitmap(Drawable drawable)
//package com.java2s; import android.graphics.Bitmap; import android.graphics.Canvas; import android.graphics.drawable.BitmapDrawable; import android.graphics.drawable.Drawable; public class Main { public static Bitmap drawableToBitmap(Drawable drawable) { if (drawable instanceof BitmapDrawable) { return ((BitmapDrawable) drawable).getBitmap(); }//from w w w. ja va2s . c o m final Bitmap bitmap = Bitmap.createBitmap(100, 100, Bitmap.Config.ARGB_8888); final Canvas canvas = new Canvas(bitmap); drawable.setBounds(0, 0, canvas.getWidth(), canvas.getHeight()); drawable.draw(canvas); return bitmap; } }