RoundedDrawable.java 文件源码

public static Bitmap drawableToBitmap(Drawable drawable) {
    if (drawable instanceof BitmapDrawable) {
        return ((BitmapDrawable) drawable).getBitmap();
    }
    try {
        Bitmap bitmap = Bitmap.createBitmap(Math.max(drawable.getIntrinsicWidth(), 2), Math
                .max(drawable.getIntrinsicHeight(), 2), Config.ARGB_8888);
        Canvas canvas = new Canvas(bitmap);
        drawable.setBounds(0, 0, canvas.getWidth(), canvas.getHeight());
        drawable.draw(canvas);
        return bitmap;
    } catch (Exception e) {
        e.printStackTrace();
        Log.w(TAG, "Failed to create bitmap from drawable!");
        return null;
    }
}