ANDROID SHAREDPREFERENCES TUTORIAL PDF

This can be done in two ways. One is storing them in a global variables and second is storing the data in shared preferences. The problem with storing data in global variable is data will be lost once user closes the application, but storing the data in shared preferences will be persistent even though user closes the application. Application shared preferences allows you to save and retrieve key, value pair data. Before getting into tutorial, I am giving basic information needed to work with shared preferences.

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This can be done in two ways. One is storing them in a global variables and second is storing the data in shared preferences. The problem with storing data in global variable is data will be lost once user closes the application, but storing the data in shared preferences will be persistent even though user closes the application. Application shared preferences allows you to save and retrieve key, value pair data. Before getting into tutorial, I am giving basic information needed to work with shared preferences.

Initialization Application shared preferences can be fetched using getSharedPreferences method. You also need an editor to edit and save the changes in shared preferences. The following code can be used to get application shared preferences. All the primitive data types like booleans, floats, ints, longs, and strings are supported. Call editor. Remember this method should be called on Shared Preferences not on Editor. If you want to delete all the data, call clear editor.

At first user will login using login details and once he successfully logged in his credentials name, email will be stored in shared preferences. I am adding alert dialog manager class to show alert messages while validating the login form. Create a new class and name it as AlertDialogManager. AlertDialog; import android. Context; import android. Builder context. I am writing all session related functions in one class to make them available in all activities. Create a new class named SessionManagement.

HashMap; import android. Intent; import android. SharedPreferences; import android. In this example i am storing login status, name, email in shared preferences, so i added a function called createLoginSession String name, String email to SessionManagement class.

Add the following function to SessionManagement. In order to get the stored preferences data, I added a function called getUserDetails with the following code. To check whether user logged in or not i added a function checkLogin which you can call in all Activities to check user login status.

Add a function called logoutUser to clear all the data from shared preferences. Call this function when you want to logout the user. Until now we are done creating Session Management class and now we are going to learn how to use this class in your application. For this create a simple login form asking username, password. Create a layout xml file and a class to create login form.

Once the user enters correct login details a session will be created by calling session. Activity; import android. Bundle; import android. View; import android. Button; import android. EditText; import android. After user redirected to MainActivity, I am getting stored session data by calling getUserDetails and displayed in textviews. Here if user is not login he will be redirected to LoginActivity.

Html; import android. TextView; import android. Open AndroidManifest.

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Android SharedPreferences to save data internally Tutorial

This tutorial explains, how to use Sharedpreferences to store data internally in an Android Application. Introduction Android provides many ways to store the data internally in an Android Application. One of the way is SharedPreferences. SharedPreferences allow you to store data using Key value pair. This tutorial explains how to store the data list internally using SharedPreferences.

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