I'm new to Android. I'm doing an app for an university exam. I have to do an application for a travel agency. I'd like to manage the user session with shared preferences in order to save basic information and the eventually travels that the user booked. I can't find an example on the web that combine the registration and login forms. I wrote this code but it's not working. It doesn't show any error. I think what I wrote it's not logic. I'd like to register first and login with the information I gave in the registration form. Thank you for your help.
This is my Login.java:
package com.example.trip;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
public class Login extends ActionBarActivity {
public static android.content.SharedPreferences SharedPreferences = null;
private static final String PREFER_NAME = null;
Button buttonLogin;
EditText txtUsername, txtPassword;
// User Session Manager Class
UserSession session;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.login);
Button switchButton = (Button)findViewById(R.id.buttonReg);
switchButton.setOnClickListener (new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent=new Intent(Login.this, Reg.class);
startActivity(intent);
}
});
// User Session Manager
session = new UserSession(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
buttonLogin = (Button) findViewById(R.id.buttonLogin);
SharedPreferences = getSharedPreferences(PREFER_NAME, Context.MODE_PRIVATE);
// Login button click event
buttonLogin.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){
if (SharedPreferences.contains("name"))
{
String uName = (SharedPreferences).getString("name", "");
}
if (SharedPreferences.contains("email"))
{
String uEmail = (SharedPreferences).getString("email", "");
}
Object uName = null;
Object uEmail = null;
if(username.equals(uName) && password.equals(uEmail)){
session.createUserLoginSession(uName,
uEmail);
// Starting MainActivity
Intent i = new Intent(getApplicationContext(),MainActivity.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();
}
}
});
}
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = new MenuInflater(this);
inflater.inflate(R.menu.main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
int id = item.getItemId();
switch (id) {
case R.id.MENU_1:
Intent intent1 = new Intent(this, Login.class);
this.startActivity(intent1);
break;
case R.id.MENU_2:
Intent intent2 = new Intent(this, MainActivity.class);
this.startActivity(intent2);
break;
default:
return super.onOptionsItemSelected(item);
}
return true;
}
}
This is the UserSession.java:
package com.example.trip;
import java.util.HashMap;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
public class UserSession {
// Shared Preferences reference
SharedPreferences pref;
// Editor reference for Shared preferences
Editor editor;
// Context
Context _context;
// Shared preferences mode
int PRIVATE_MODE = 0;
// Shared preferences file name
public static final String PREFER_NAME = "AndroidExamplePref";
// All Shared Preferences Keys
public 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 UserSession(Context context){
this._context = context;
pref = _context.getSharedPreferences(PREFER_NAME, PRIVATE_MODE);
editor = pref.edit();
}
//Create login session
public void createUserLoginSession(Object uName, Object uEmail){
// Storing login value as TRUE
editor.putBoolean(IS_USER_LOGIN, true);
// Storing name in preferences
editor.putString(KEY_NAME, (String) uName);
// Storing email in preferences
editor.putString(KEY_EMAIL, (String) uEmail);
// 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, Login.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<String, String> getUserDetails(){
//Use hashmap to store user credentials
HashMap<String, String> user = new HashMap<String, String>();
// 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 MainActivity
Intent i = new Intent(_context, MainActivity.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);
}
}
This is the MainActivity.java:
public class MainActivity extends ActionBarActivity {
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = new MenuInflater(this);
inflater.inflate(R.menu.main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
int id = item.getItemId();
switch (id) {
case R.id.MENU_1:
Intent intent1 = new Intent(this, Login.class);
this.startActivity(intent1);
break;
case R.id.MENU_2:
Intent intent2 = new Intent(this, MainActivity.class);
this.startActivity(intent2);
break;
default:
return super.onOptionsItemSelected(item);
}
return true;
}
}
This is my Reg.java:
package com.example.trip;
import android.content.Intent;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
import android.view.View.OnClickListener;
public class Reg extends ActionBarActivity {
SharedPreferences SharedPreferences;
Editor editor;
Button buttonReg2;
EditText txtUsername, txtPassword, txtEmail;
UserSession session;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.reg);
txtUsername = (EditText) findViewById(R.id.Name);
txtPassword = (EditText) findViewById(R.id.txtPassword);
txtEmail = (EditText) findViewById(R.id.Email);
buttonReg2 = (Button) findViewById(R.id.buttonReg2);
// creating an shared Preference file for the information to be stored
// first argument is the name of file and second is the mode, 0 is private mode
SharedPreferences = getSharedPreferences("Reg", 0);
// get editor to edit in file
editor = SharedPreferences.edit();
buttonReg2.setOnClickListener(new View.OnClickListener() {
public void onClick (View v) {
String name = txtUsername.getText().toString();
String email = txtEmail.getText().toString();
String pass = txtPassword.getText().toString();
if(txtUsername.getText().length()<=0){
Toast.makeText(Reg.this, "Enter name", Toast.LENGTH_SHORT).show();
}
else if( txtEmail.getText().length()<=0){
Toast.makeText(Reg.this, "Enter email", Toast.LENGTH_SHORT).show();
}
else if( txtPassword.getText().length()<=0){
Toast.makeText(Reg.this, "Enter password", Toast.LENGTH_SHORT).show();
}
else{
// as now we have information in string. Lets stored them with the help of editor
editor.putString("Name", name);
editor.putString("Email",email);
editor.putString("txtPassword",pass);
editor.commit();} // commit the values
// after saving the value open next activity
Intent ob = new Intent(Reg.this, Login.class);
startActivity(ob);
}
});
}
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = new MenuInflater(this);
inflater.inflate(R.menu.main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
int id = item.getItemId();
switch (id) {
case R.id.MENU_1:
Intent intent1 = new Intent(this, Login.class);
this.startActivity(intent1);
break;
case R.id.MENU_2:
Intent intent2 = new Intent(this, MainActivity.class);
this.startActivity(intent2);
break;
default:
return super.onOptionsItemSelected(item);
}
return true;
}
}
The XML code of the MainActivity:
<?xml version="1.0" encoding="utf-8"?>
<TableLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="top"
android:shrinkColumns="0"
android:stretchColumns="1" >
<TableRow
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="fill_horizontal|center_vertical" >
<TextView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="fill_horizontal|center_vertical"
android:text="@string/destinazione" />
<EditText
android:layout_width="match_parent"
android:layout_height="match_parent"
android:inputType="text" />
</TableRow>
<TableRow
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="fill_horizontal|center_vertical" >
<TextView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="fill_horizontal|center_vertical"
android:text="@string/checkin" />
<EditText
android:layout_width="match_parent"
android:layout_height="match_parent"
android:inputType="date" />
</TableRow>
<TableRow
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="fill_horizontal|center_vertical" >
<TextView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="fill_horizontal|center_vertical"
android:text="@string/checkout" />
<EditText
android:layout_width="match_parent"
android:layout_height="match_parent"
android:inputType="date" />
</TableRow>
<TableRow
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="fill_horizontal|center_vertical" >
<TextView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="fill_horizontal|center_vertical"
android:text="@string/viaggiatori" />
<EditText
android:layout_width="match_parent"
android:layout_height="match_parent"
android:inputType="number" />
</TableRow>
<TableRow
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="fill_horizontal|center_vertical" >
<TextView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="fill_horizontal|center_vertical"
android:text="@string/stelle" />
<Spinner
android:id="@+id/spinner"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:entries="@array/stelle"/>
</TableRow>
<Button
android:id="@+id/buttonFind"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/buttonFind" />
</TableLayout>
The XML code for the login form:
<?xml version="1.0" encoding="utf-8"?>
<TableLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="top"
android:shrinkColumns="0"
android:stretchColumns="1" >
<TableRow
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="fill_horizontal|center_vertical" >
<TextView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="fill_horizontal|center_vertical"
android:text="@string/txtUsername" />
<EditText
android:id="@+id/txtUsername"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:inputType="text" />
</TableRow>
<TableRow
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="fill_horizontal|center_vertical" >
<TextView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="fill_horizontal|center_vertical"
android:text="@string/txtPassword" />
<EditText
android:id="@+id/txtPassword"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:inputType="textPassword" />
</TableRow>
<Button
android:id="@+id/buttonLogin"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/buttonLogin" />
<Button
android:id="@+id/buttonReg"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/buttonReg" />
</TableLayout>
This is the XML code for the registration form:
<?xml version="1.0" encoding="utf-8"?>
<TableLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="top"
android:shrinkColumns="0"
android:stretchColumns="1" >
<TableRow
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="fill_horizontal|center_vertical" >
<TextView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="fill_horizontal|center_vertical"
android:text="@string/Name" />
<EditText
android:id="@+id/Name"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:inputType="text" />
</TableRow>
<TableRow
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="fill_horizontal|center_vertical" >
<TextView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="fill_horizontal|center_vertical"
android:text="@string/Email" />
<EditText
android:id="@+id/Email"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:inputType="textEmailAddress" />
</TableRow>
<TableRow
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="fill_horizontal|center_vertical" >
<TextView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="fill_horizontal|center_vertical"
android:text="@string/txtPassword" />
<EditText
android:id="@+id/txtPassword"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:inputType="textPassword" />
</TableRow>
<Button
android:id="@+id/buttonReg2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/buttonReg2" />
</TableLayout>
This is working code, try it.
MainActivity.java
import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
public class MainActivity extends ActionBarActivity {
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = new MenuInflater(this);
inflater.inflate(R.menu.main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
int id = item.getItemId();
switch (id) {
case R.id.menu1:
Intent intent1 = new Intent(this, Login.class);
this.startActivity(intent1);
break;
case R.id.menu2:
Intent intent2 = new Intent(this, MainActivity.class);
this.startActivity(intent2);
break;
default:
return super.onOptionsItemSelected(item);
}
return true;
}
}
Reg.java
import android.content.Intent;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
public class Reg extends ActionBarActivity {
SharedPreferences sharedPreferences;
Editor editor;
Button buttonReg2;
EditText txtUsername, txtPassword, txtEmail;
UserSession session;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.reg);
txtUsername = (EditText) findViewById(R.id.Name);
txtPassword = (EditText) findViewById(R.id.txtPassword);
txtEmail = (EditText) findViewById(R.id.Email);
buttonReg2 = (Button) findViewById(R.id.buttonReg2);
// creating an shared Preference file for the information to be stored
// first argument is the name of file and second is the mode, 0 is private mode
sharedPreferences = getApplicationContext().getSharedPreferences("Reg", 0);
// get editor to edit in file
editor = sharedPreferences.edit();
buttonReg2.setOnClickListener(new View.OnClickListener() {
public void onClick (View v) {
String name = txtUsername.getText().toString();
String email = txtEmail.getText().toString();
String pass = txtPassword.getText().toString();
if(txtUsername.getText().length()<=0){
Toast.makeText(Reg.this, "Enter name", Toast.LENGTH_SHORT).show();
}
else if( txtEmail.getText().length()<=0){
Toast.makeText(Reg.this, "Enter email", Toast.LENGTH_SHORT).show();
}
else if( txtPassword.getText().length()<=0){
Toast.makeText(Reg.this, "Enter password", Toast.LENGTH_SHORT).show();
}
else{
// as now we have information in string. Lets stored them with the help of editor
editor.putString("Name", name);
editor.putString("Email",email);
editor.putString("txtPassword",pass);
editor.commit();} // commit the values
// after saving the value open next activity
Intent ob = new Intent(Reg.this, Login.class);
startActivity(ob);
}
});
}
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = new MenuInflater(this);
inflater.inflate(R.menu.main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
int id = item.getItemId();
switch (id) {
case R.id.menu1:
Intent intent1 = new Intent(this, Login.class);
this.startActivity(intent1);
break;
case R.id.menu2:
Intent intent2 = new Intent(this, MainActivity.class);
this.startActivity(intent2);
break;
default:
return super.onOptionsItemSelected(item);
}
return true;
}
}
Login.java
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
public class Login extends ActionBarActivity {
//public static android.content.SharedPreferences SharedPreferences = null;
private static final String PREFER_NAME = "Reg";
Button buttonLogin;
EditText txtUsername, txtPassword;
// User Session Manager Class
UserSession session;
private SharedPreferences sharedPreferences;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.login);
Button switchButton = (Button)findViewById(R.id.buttonReg);
switchButton.setOnClickListener (new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent=new Intent(Login.this, Reg.class);
startActivity(intent);
}
});
// User Session Manager
session = new UserSession(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
buttonLogin = (Button) findViewById(R.id.buttonLogin);
sharedPreferences = getSharedPreferences(PREFER_NAME, Context.MODE_PRIVATE);
// Login button click event
buttonLogin.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){
String uName = null;
String uPassword =null;
if (sharedPreferences.contains("Name"))
{
uName = sharedPreferences.getString("Name", "");
}
if (sharedPreferences.contains("txtPassword"))
{
uPassword = sharedPreferences.getString("txtPassword", "");
}
// Object uName = null;
// Object uEmail = null;
if(username.equals(uName) && password.equals(uPassword)){
session.createUserLoginSession(uName,
uPassword);
// Starting MainActivity
Intent i = new Intent(getApplicationContext(),MainActivity.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();
}
}
});
}
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = new MenuInflater(this);
inflater.inflate(R.menu.main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
int id = item.getItemId();
switch (id) {
case R.id.menu1:
Intent intent1 = new Intent(this, Login.class);
this.startActivity(intent1);
break;
case R.id.menu2:
Intent intent2 = new Intent(this, MainActivity.class);
this.startActivity(intent2);
break;
default:
return super.onOptionsItemSelected(item);
}
return true;
}
}
UserSession.java
package com.example.tripmanager;
import java.util.HashMap;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
public class UserSession {
// Shared Preferences reference
SharedPreferences pref;
// Editor reference for Shared preferences
Editor editor;
// Context
Context _context;
// Shared preferences mode
int PRIVATE_MODE = 0;
// Shared preferences file name
public static final String PREFER_NAME = "Reg";
// All Shared Preferences Keys
public 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";
// password
public static final String KEY_PASSWORD = "txtPassword";
// Constructor
public UserSession(Context context){
this._context = context;
pref = _context.getSharedPreferences(PREFER_NAME, PRIVATE_MODE);
editor = pref.edit();
}
//Create login session
public void createUserLoginSession(String uName, String uPassword){
// Storing login value as TRUE
editor.putBoolean(IS_USER_LOGIN, true);
// Storing name in preferences
editor.putString(KEY_NAME, uName);
// Storing email in preferences
editor.putString(KEY_EMAIL, uPassword);
// 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, Login.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<String, String> getUserDetails(){
//Use hashmap to store user credentials
HashMap<String, String> user = new HashMap<String, String>();
// 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 MainActivity
Intent i = new Intent(_context, MainActivity.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);
}
}
This code working in my project,must try it
Use this code after login validation to store login value
String Username = textInputEditTextEmail.getText().toString();
String Password = textInputEditTextPassword.getText().toString();
final SharedPreferences sharedPref = PreferenceManager.getDefaultSharedPreferences(this);
SharedPreferences.Editor editor = sharedPref.edit();
editor.putBoolean("Registered", true);
editor.putString("Username", Username);
editor.putString("Password", Password);
editor.apply();
Create new empty activity and copy this code
Boolean Registered;
final SharedPreferences sharedPref = PreferenceManager.getDefaultSharedPreferences(this);
Registered = sharedPref.getBoolean("Registered", false);
if (!Registered)
{
startActivity(new Intent(this,Splash.class));
}else {
startActivity(new Intent(this,MainActivity.class));
}
In Menifest file copy the intent-filter code in newly created empty file for initial access.
For Logout, Create any button copy this code in click on listener
SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(MainActivity.this);
SharedPreferences.Editor editor = preferences.edit();
editor.clear();
editor.commit();
Intent i = new Intent(MainActivity.this,Login.class);
startActivity(i);
来源：https://stackoverflow.com/questions/26740185/android-login-registration-with-shared-preferences