How to convert string to bitmap and Bitmap to string

In android, Normally we send and receive data in the form of]string.So if we have image in the Bitmap form then we can not send it to server.So here i made a simple function that you need pass bitmap and it will return a string

     /**
       * @param bitmap
       * @return converting bitmap and return a string
       */
       public String BitMapToString(Bitmap bitmap){
            ByteArrayOutputStream baos=new  ByteArrayOutputStream();
            bitmap.compress(Bitmap.CompressFormat.PNG,100, baos);
            byte [] b=baos.toByteArray();
            String temp=Base64.encodeToString(b, Base64.DEFAULT);
            return temp;
      }