自己动手丰衣足食 如何制作限速图片

public Bitmap compressBitmap(String num,int width, int height){//num中间要显示的数字，width原图片的宽度，height原图片的高度Bitmap mbitmap = BitmapFactory.decodeResource(getResources(), R.drawable.xxx);Bitmap bitmap = Bitmap.createBitmap(width, height, Config.ARGB_8888);Canvas canvas = new Canvas(bitmap);Paint paint = new Paint();paint.setColor(Color.GREEN);paint.setAntiAlias(true);paint.setStrokeWidth(12);paint.setTextSize(18);canvas.drawBitmap(mbitmap, 0, 0, paint);canvas.drawText(num, width/2, height/2, paint);return bitmap;} Drawable d = new BitmapDrawable(compressBitmap("100", 72, 72));//制作中间有100的限速图片