Drawable转换为Bitmap两种方法

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Drawable转换为Bitmap两种方法

如果通过网络加载了一张位图，想拿到这张位图的Bitmap，有两种办法，至于那种好，可能要看是在什么情况下了

1，根据已有的Drawable创建一个新的Bitmap:

 1 private Bitmap bitmap; 2 private void drawableToBitamp(Drawable drawable) 3     { 4         int w = drawable.getIntrinsicWidth(); 5         int h = drawable.getIntrinsicHeight(); 6         System.out.println("Drawable转Bitmap"); 7         Bitmap.Config config =  8                 drawable.getOpacity() != PixelFormat.OPAQUE ? Bitmap.Config.ARGB_8888 9                         : Bitmap.Config.RGB_565;10         bitmap = Bitmap.createBitmap(w,h,config);11         //注意，下面三行代码要用到，否在在View或者surfaceview里的canvas.drawBitmap会看不到图12         Canvas canvas = new Canvas(bitmap);   13         drawable.setBounds(0, 0, w, h);   14         drawable.draw(canvas);15     }

2,直接从现有的Drawable中取出Bitmap:

1 private Bitmap bitmap;2 3 private void drawableToBitamp(Drawable drawable)4     {5         BitmapDrawable bd = (BitmapDrawable) drawable;6         bitmap = bd.getBitmap();7     }

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