If we are Storing data in shared preferences will be persistent to all application even after user closes the application.
You can save key, value pair data in Shared preferences.
This class contain all user session related functions.
In this class file creating SharedPreferences and inserting / updating / deleting user session data from SharedPreferences.
further explanation given as comment in class code.
Total Files 6 :. 1. Manifest File 2.
SessionLoginActivity.java 3. SessionLogoutActivity 4. 5.
1/6. manifest file
<activity android:name=".SessionLoginActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name=".SessionLogoutActivity" />
2. SessionLoginActivity.java
package com.example.myapplication;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
public class SessionLoginActivity extends Activity {
Button btnLogin;
EditText txtUsername, txtPassword;
// User Session Manager Class SessionManager session;
@Override public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.session_login);
// User Session Manager session = new SessionManager(getApplicationContext());
// get Email, Password input text txtUsername = (EditText) findViewById(R.id.txtUsername);
txtPassword = (EditText) findViewById(R.id.txtPassword);
Toast.makeText(getApplicationContext(),
"User Login Status: " + session.isUserLoggedIn(),
Toast.LENGTH_LONG).show();
// User Login button btnLogin = (Button) findViewById(R.id.btnLogin);
// Login button click event btnLogin.setOnClickListener(new View.OnClickListener() {
@Override public void onClick(View arg0) {
// Get username, password from EditText String username = txtUsername.getText().toString();
String password = txtPassword.getText().toString();
// Validate if username, password is filled if(username.trim().length() > 0 && password.trim().length() > 0){
// For testing puspose username, password is checked with static data // username = admin // password = admin
if(username.equals("admin") && password.equals("learnskill.today")){
// Creating user login session // Statically storing name="Session Example" // and email="aashish.learnskill@gmail.com" session.createUserLoginSession("Session Example",
"aashish.learnskill@gmail.com");
// Starting MainActivity Intent i = new Intent(getApplicationContext(), SessionLogoutActivity.class);
i.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
// Add new Flag to start new Activity i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(i);
finish();
}else{
// username / password doesn't match& Toast.makeText(getApplicationContext(),
"Username/Password is incorrect",
Toast.LENGTH_LONG).show();
}
}else{
// user didn't entered username or password Toast.makeText(getApplicationContext(),
"Please enter username and password",
Toast.LENGTH_LONG).show();
}
}
});
}
}
3. SessionLogoutActivity
package com.example.myapplication;
import java.util.HashMap;
import android.app.Activity;
import android.os.Bundle;
import android.text.Html;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
public class SessionLogoutActivity extends Activity {
// User Session Manager Class SessionManager session;
// Button Logout Button btnLogout;
@Override public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.session_logout);
// Session class instance session = new SessionManager(getApplicationContext());
TextView lblName = (TextView) findViewById(R.id.lblName);
TextView lblEmail = (TextView) findViewById(R.id.lblEmail);
// Button logout btnLogout = (Button) findViewById(R.id.btnLogout);
Toast.makeText(getApplicationContext(),
"User Login Status: " + session.isUserLoggedIn(),
Toast.LENGTH_LONG).show();
// Check user login (this is the important point) // If User is not logged in , This will redirect user to LoginActivity // and finish current activity from activity stack. if(session.checkLogin())
finish();
// get user data from session HashMap user = session.getUserDetails();
// get name String name = user.get(SessionManager.KEY_NAME);
// get email String email = user.get(SessionManager.KEY_EMAIL);
// Show user data on activity lblName.setText(Html.fromHtml("Name: " + name + ""));
lblEmail.setText(Html.fromHtml("Email: " + email + ""));
btnLogout.setOnClickListener(new View.OnClickListener() {
@Override public void onClick(View arg0) {
// Clear the User session data // and redirect user to LoginActivity session.logoutUser();
}
});
}
}
4. UserSessionManager.java
package com.example.myapplication;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import java.util.HashMap;
public class SessionManager {
// Shared Preferences reference SharedPreferences pref;
// Editor reference for Shared preferences Editor editor;
// Context Context _context;
// Shared pref mode int PRIVATE_MODE = 0;
// Sharedpref file name private static final String PREFER_NAME = "AndroidExamplePref";
// All Shared Preferences Keys private static final String IS_USER_LOGIN = "IsUserLoggedIn";
// User name (make variable public to access from outside) public static final String KEY_NAME = "name";
// Email address (make variable public to access from outside) public static final String KEY_EMAIL = "email";
// Constructor public SessionManager(Context context){
this._context = context;
pref = _context.getSharedPreferences(PREFER_NAME, PRIVATE_MODE);
editor = pref.edit();
}
//Create login session public void createUserLoginSession(String name, String email){
// Storing login value as TRUE editor.putBoolean(IS_USER_LOGIN, true);
// Storing name in pref editor.putString(KEY_NAME, name);
// Storing email in pref editor.putString(KEY_EMAIL, email);
// commit changes editor.commit();
}
/** * Check login method will check user login status * If false it will redirect user to login page * Else do anything * */ public boolean checkLogin(){
// Check login status if(!this.isUserLoggedIn()){
// user is not logged in redirect him to Login Activity Intent i = new Intent(_context, SessionLoginActivity.class);
// Closing all the Activities from stack i.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
// Add new Flag to start new Activity i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
// Staring Login Activity _context.startActivity(i);
return true;
}
return false;
}
/** * Get stored session data * */ public HashMap getUserDetails(){
//Use hashmap to store user credentials HashMap user = new HashMap();
// user name user.put(KEY_NAME, pref.getString(KEY_NAME, null));
// user email id user.put(KEY_EMAIL, pref.getString(KEY_EMAIL, null));
// return user return user;
}
/** * Clear session details * */ public void logoutUser(){
// Clearing all user data from Shared Preferences editor.clear();
editor.commit();
// After logout redirect user to Login Activity Intent i = new Intent(_context, SessionLoginActivity.class);
// Closing all the Activities i.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
// Add new Flag to start new Activity i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
// Staring Login Activity _context.startActivity(i);
}
// Check for login public boolean isUserLoggedIn(){
return pref.getBoolean(IS_USER_LOGIN, false);
}
}
 |
| session_login.xml |
 | | | | | | | |
| sessionlogout.xml |
5.session_login.xml
xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" android:padding="10dip">
<TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="Username (Enter 'admin')" android:singleLine="true" android:layout_marginBottom="5dip"/>
<EditText android:id="@+id/txtUsername" android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_marginBottom="10dip"/>
<TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="Password (Enter 'learnskill.today')" android:layout_marginBottom="5dip"/>
<EditText android:id="@+id/txtPassword" android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_marginBottom="20dip" android:password="true" android:singleLine="true"/>
<Button android:id="@+id/btnLogin" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="Login"/>
</LinearLayout>
6. session_logout.xml
xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" android:padding="10dip">
<TextView android:id="@+id/lblName" android:layout_width="fill_parent" android:layout_height="wrap_content" android:singleLine="true" android:layout_marginTop="40dip" android:layout_marginBottom="10dip"/>
<TextView android:id="@+id/lblEmail" android:layout_width="fill_parent" android:layout_height="wrap_content" android:singleLine="true" android:layout_marginBottom="40dip"/>
<Button android:id="@+id/btnLogout" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="Logout"/>
</LinearLayout>
