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.Bitmap.Config; 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. java 2 s .c o m Canvas canvas = new Canvas(); Bitmap bitmap = Bitmap.createBitmap(drawable.getMinimumWidth(), drawable.getMinimumHeight(), Config.ARGB_8888); canvas.setBitmap(bitmap); drawable.draw(canvas); return bitmap; } }