1.Byte数组转Bitmap
BitmapFactory.decodeByteArray(bytes, 0, bytes.length);
2.Bitmap转Byte数组
ByteArrayOutputStream baos = new ByteArrayOutputStream();
bitmap.compress(Bitmap.CompressFormat.JPEG, 100, baos);
bytes = baos.toByteArray();
3.Drawable转Bitmap
Drawable d=xxx; //xxx根据自己的情况获取drawable
BitmapDrawable bd = (BitmapDrawable) d;
Bitmap bm = bd.getBitmap();
4.Bitmap转Drawable
Bitmap bm=xxx; //xxx指获取的bitmap
BitmapDrawable bd=BitmapDrawable(bm);