link of image into object or string or anything that can be stored into SharedPreferences

link of image into object or string or anything that can be stored into
SharedPreferences

Im new to android and java programming, please explain in detail what
should i do from here. I want to download an image and store it in a
SharedPreferences. any variable will do, as long as you can also show me
how to output the image as imageview. i read similar topics but i cant
understand fully and i don't know how to work with those.
here's my code, class extends AsyncTask -> onPreExecute:
protected void onPostExecute(String result) {
SharedPreferences pref = getApplicationContext().getSharedPreferences(
"athan", MODE_PRIVATE);
Editor editor = pref.edit();
try{
JSONArray jArray = new JSONArray(result);
for(int i=0;i<jArray.length();i++)
{
JSONObject json_data = jArray.getJSONObject(i);
editor.putString("fstime"+i, json_data.getString("time"));
editor.putString("fspname"+i,
json_data.getString("postname"));
//this is what i want to modify:
//editor.putString("fsfile"+i, json_data.getString("file"));
//"json_data.getString("file")" gives a value of
string of link to the image
//so instead of saving the link, i want to download
the image and store in in SharedPreference instead.
//like editor.putImage("fsfile"+i,
json_data.getImage("file"));
}
editor.putBoolean("fileshares", true);
editor.commit();
}
catch(JSONException e)
{
Log.e("Athan", "Error parsing data "+e.toString());
}
fileshareview();
}
}