Android Shared Preference Tutorial

The sharedPreferernce provides a general framework that allows you to save and retrieve persistent key-value pairs of primitive data types. You can use sharedPreferences  to save any primitive data: booleans, floats, ints, longs, and strings. This data will persist across user sessions (even if your application is killed).

to know more about   Refer  sharedPreference

you can download the source code of this project from  google drive https://drive.google.com/folderview?id=0BySLpWhqmbbdRXZxd0ZveHllcG8&usp=sharing
click on the above link ->sign into  your  google account ->add this to your google drive -> open it in google drive and download it.

Following is the demo application using SharedPrefence. This application is just used to set and get name.Value that you set will be persistent even if you close the application. the value is saved in a xml file. you can view this file in eclipse . open  DDMS go to   FileExplore there is folder data. Open
data->data->yourAppPackage(com.arun.DemoSharedPreference)->shared_prefs-> yourAppPackage.xml(com.arun.DemoSharedPreference.xml)


First create a xml layout for  setting and getting name.

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <EditText
        android:id="@+id/editname_id"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content" />

    <Button
        android:id="@+id/setBtn_id"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Set Name" />

    <Button
        android:id="@+id/getBtn_id"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Get Name" />

    <EditText
        android:id="@+id/showname_id"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content" />

</LinearLayout>

Activity for setting and getting files

package com.arun.DemoSharedPreference;

import android.app.Activity;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.preference.PreferenceManager;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;

public class MainaActivity extends Activity {
 SharedPreferences namePreferences;
 EditText ediName, showName;
 Button setBtn, getBtn;

 /** Called when the activity is first created. */
 @Override
 public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.main);
  namePreferences = PreferenceManager.getDefaultSharedPreferences(this);
  ediName = (EditText) findViewById(R.id.editname_id);
  showName = (EditText) findViewById(R.id.showname_id);
  setBtn = (Button) findViewById(R.id.setBtn_id);
  getBtn = (Button) findViewById(R.id.getBtn_id);
  setBtn.setOnClickListener(new OnClickListener() {

   @Override
   public void onClick(View v) {

    SharedPreferences.Editor nameEditor = namePreferences.edit();
    nameEditor.putString("name", ediName.getText().toString());
    nameEditor.commit();
   }

  });
  getBtn.setOnClickListener(new OnClickListener() {

   @Override
   public void onClick(View v) {

    String nameValue = namePreferences.getString("name", "");
    showName.setText(nameValue);
   }

  });

 }
}

following is the sharedPreference file of my appliction from DDMS

<?xml version='1.0' encoding='utf-8' standalone='yes' ?>

<map>

<string name="name">arun</string>

</map>

Here is the screen shot of my application