Android中Bitmap、Drawable、byte[]互換

1.Drawable—>Bitmap查看原始碼列印協助Resources res=getResources();Bitmap bmp=BitmapFactory.decodeResource(res, R.drawable.sample_0);2.Bitmap---->DrawableDrawable drawable =new BitmapDrawable(bmp);另外在網上搜了一些其它的方法，在這裡分享下1、Drawable → Bitmappublic static Bitmap drawableToBitmap(Drawable drawable){    Config config;    if (drawable.getOpacity() != PixelFormat.OPAQUE)    {        config = Bitmap.Config.ARGB_8888;    }    else    {        config = Bitmap.Config.RGB_565;    }    Bitmap bitmap = Bitmap.createBitmap(drawable.getIntrinsicWidth(),                    rawable.getIntrinsicHeight(),config);    Canvas canvas = new Canvas(bitmap);    // canvas.setBitmap(bitmap);    drawable.setBounds(0, 0, drawable.getIntrinsicWidth(),                             drawable.getIntrinsicHeight());    drawable.draw(canvas);    return bitmap;}2、從資源中擷取BitmapResources res=getResources();Bitmap bmp=BitmapFactory.decodeResource(res, R.drawable.pic);3、Bitmap → byte[]private byte[] Bitmap2Bytes(Bitmap bm){    ByteArrayOutputStream baos = new ByteArrayOutputStream();    bm.compress(Bitmap.CompressFormat.PNG, 100, baos);    return baos.toByteArray();}4、byte[] → Bitmapprivate Bitmap Bytes2Bimap(byte[] b){    if (b.length != 0)    {        return BitmapFactory.decodeByteArray(b, 0, b.length);    } else    {        return null;    }}