Bitmap bmp =BitmapFactory.decodeResource(getResources(), R.drawable.ic_launcher); Paint paint = new Paint(); paint.setColor(Color.BLACK); String str = "123"; Canvas canvas = new Canvas(bmp); //此句报错 canvas.drawText(str, 0, 0, paint);
不允许直接修改res里面的图片，只要在后面加上.copy(Bitmap.Config.ARGB_8888, true);
修改后：
Bitmap originalBitmap = BitmapFactory.decodeResource(getResources(),R.drawable.a).copy(Bitmap.Config.ARGB_8888, true);
Caused by: java.lang.IllegalStateException: Immutable bitmap passed to Canvas constructor
原文：http://www.cnblogs.com/maxiaodoubao/p/4422354.html