Drawable和Bitmap互相转换

1. Drawable To Bitmap

    public static Bitmap drawable2Bitmap(Drawable drawable) {  
        int width = drawable.getIntrinsicHeight();  
        int height = drawable.getIntrinsicHeight();  
  
        Bitmap bitmap = Bitmap.createBitmap(width, height, drawable  
                .getOpacity() != PixelFormat.OPAQUE ? Bitmap.Config.ARGB_8888  
                : Bitmap.Config.RGB_565);  
        Canvas canvas = new Canvas(bitmap);  
        drawable.setBounds(0, 0, width, height);  
        drawable.draw(canvas);  
  
        return bitmap;  
    }

2. Bitmap To Drawable

    public static Drawable bitmapToDrawable(Bitmap bitmap){  
        //BitmapDrawable 是 Drawable的派生类  
        return new BitmapDrawable(bitmap);  
    }