来源于网络，用以备忘

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//将Bitmap转为String，方便存储
String imgstr=null;
ByteArrayOutputStream outputStream=new ByteArrayOutputStream(); //压缩图片
bm.compress(Bitmap.CompressFormat.PNG,80,outputStream);
byte[] imagbyte=outputStream.toByteArray();
imgstr=Base64.enpreToString(imagbyte, Base64.DEFAULT);

//将String转为Bitmap
byte[] img= Base64.depre(jsonObject.get("musicImage").toString(),Base64.DEFAULT);
Bitmap bm= BitmapFactory.depreByteArray(img,0,img.length);