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 }

转载于:https://www.cnblogs.com/JD85/archive/2012/01/26/2329872.html