Android Drawable和Bitmap的转换实例详解

Bitmap bm=xxx; //xxx根据你的情况获取BitmapDrawable bd=new BitmapDrawable(bm);//因为BtimapDrawable是Drawable的子类，最终直接使用bd对象即可。

Drawable d=xxx; //xxx根据自己的情况获取drawableBitmapDrawable bd = (BitmapDrawable) d;Bitmap bm = bd.getBitmap();//最终bm就是我们需要的Bitmap对象了。

public static Bitmap getBitmapFromResources(Activity act, int resId) {Resources res = act.getResources();return BitmapFactory.decodeResource(res, resId);}

public static Bitmap convertBytes2Bimap(byte[] b) {if (b.length == 0) {return null;}return BitmapFactory.decodeByteArray(b, 0, b.length);}

public static byte[] convertBitmap2Bytes(Bitmap bm) {ByteArrayOutputStream baos = new ByteArrayOutputStream();bm.compress(Bitmap.CompressFormat.PNG, 100, baos);return baos.toByteArray();}