Android(安卓)Drawable、Bitmap、byte[]之间的转换

1、Drawable --> Bitmap

 Bitmap drawable2Bitmap(Drawable drawable) {  if (drawable instanceof BitmapDrawable) {   return ((BitmapDrawable) drawable).getBitmap();  } else if (drawable instanceof NinePatchDrawable) {   Bitmap bitmap = Bitmap     .createBitmap(       drawable.getIntrinsicWidth(),       drawable.getIntrinsicHeight(),       drawable.getOpacity() != PixelFormat.OPAQUE ? Bitmap.Config.ARGB_8888         : Bitmap.Config.RGB_565);   Canvas canvas = new Canvas(bitmap);   drawable.setBounds(0, 0, drawable.getIntrinsicWidth(),     drawable.getIntrinsicHeight());   drawable.draw(canvas);   return bitmap;  } else {   return null;  } }

2、从资源中获取的Drawable --> Bitmap

 Resources res = getResources(); Bitmap bmp = BitmapFactory.decodeResource(res, R.drawable.pic);

3、Bitmap --> Drawable

 Drawable bitmap2Drawable(Bitmap bitmap) {  return new BitmapDrawable(bitmap); }

4、Bitmap --> byte[]

 byte[] Bitmap2Bytes(Bitmap bm) {  ByteArrayOutputStream baos = new ByteArrayOutputStream();  bm.compress(Bitmap.CompressFormat.PNG, 100, baos);  return baos.toByteArray(); }

5、 byte[] --> Bitmap

 Bitmap Bytes2Bimap(byte[] b) {  if (b.length != 0) {   return BitmapFactory.decodeByteArray(b, 0, b.length);  } else {   return null;  } }

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