Provide Offline data in web service based application android

Provide Offline data in web service based application android 

Today  I am going to share my one of best practice module which is very help full to provide data while your web service call fails or No network situations.

I made a simple class that store web service response (JSON String ) into shared preferences
and when there is any exception in web service call. that time we used our last saved web service response and show offline data .

here is my class Offline.java

package com.gaincircle.classes;

import android.content.Context;

import android.content.SharedPreferences;

import android.preference.PreferenceManager;

import android.util.Log;

public class Offline {

       private static SharedPreferences prefs;

       private static SharedPreferences.Editor prefsEditor;

       /**

        *

        * @param preferenceName

        *  name prference whose value you want to retrive

        * @param context

        *    Context

        * @return

        */

       public static String retriveOfflineResponse(String preferenceName,

                     Context context) {

              prefs = PreferenceManager.getDefaultSharedPreferences(context);

              String jsonString = prefs.getString(preferenceName, null);

              Log.e("offline", "Data retrive for " + preferenceName + ".");

              return jsonString;

       }

       /**

        * @param jsonString

        *            Return prviously store Json String

        * @param preferenceName

        * @param context

        */

       public static void saveOfflineResponse(String preferenceName,

                     String jsonString, Context context) {

              prefs = PreferenceManager.getDefaultSharedPreferences(context);

              prefsEditor = prefs.edit();

              prefsEditor.putString(preferenceName, jsonString);

              prefsEditor.commit();

              Log.e("offline", "Data stored for " + preferenceName + ".");

       }

}

and when ever i get updated data from web service I just call the following line
as

Offline.saveOfflineResponse("DowloadedList",WebServiceResponse, context);

so every time it will store the my last successful updated data in shared preferences

and whenever i got exception in webservice call I used the following code snippet

String offlineResponse = Offline.retriveOfflineResponse("DowloadedList", context);

:)
thats end Now in  offlineResponse  string I have my last saved response. 


like that my app will always have data either it is online ot it is offline :)



I hope this will help full for you guys :)



Happy Codddddddding :)