Shared Preferance

Data stroage is important topic in application, to use it futher in app. Data stroage in android app can be done in three ways

  • Shared preferences
  • File System
  • SQLite databse

 

Here I will discuss about Shared Pref.

Why Shared Pref?

  1. Shared Pref is used to store primitive type data in into xml file, we will see demo futhere. 
  2. Using file system make coding complicated just to store simple data For example if user want to save some option in application we can use shared pref(like login data)
  3. SQLite is used when large number of data are used, using db for small data may affect runtime performance.

Example 1 : Simple Shared Pref Example

 

Step 1 : Create New Project

 

Structure of Project (Screen Shot)

 

Step 2 : Create UI for your application

User Inter face(Screen Shot)

Xml File

 

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >
 
    <EditText
        android:id="@+id/text"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:layout_marginLeft="46dp"
        android:layout_marginTop="52dp"
        android:hint="Enter the text"
        android:ems="10" >
 
        <requestFocus />
    </EditText>
 
    <Button
        android:id="@+id/remeber"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/text"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="155dp"
        android:text="Remember" />
 
</RelativeLayout>

 

Step 2 :