sharedpreferences login example in android

sharedpreferences login example in android

 In this Article Today learn sharedpreferences login example in android. for the follow full source code sharedpreferences login example in android.

1.MainActivity.java:

package com.akash.sharedpreferance;



import android.animation.Animator;

import android.animation.AnimatorListenerAdapter;

import android.annotation.TargetApi;

import android.content.Context;

import android.content.Intent;



import android.app.LoaderManager.LoaderCallbacks;

import android.content.ContentResolver;

import android.content.CursorLoader;

import android.content.Loader;

import android.database.Cursor;

import android.net.Uri;

import android.os.AsyncTask;

import android.os.Build.VERSION;

import android.os.Build;

import android.os.Bundle;

import android.provider.ContactsContract;

import android.text.TextUtils;

import android.view.KeyEvent;

import android.view.View;

import android.view.View.OnClickListener;

import android.view.inputmethod.EditorInfo;

import android.widget.ArrayAdapter;

import android.widget.AutoCompleteTextView;

import android.widget.Button;

import android.widget.CheckBox;

import android.widget.EditText;

import android.widget.TextView;



import androidx.appcompat.app.AppCompatActivity;



import java.util.ArrayList;

import java.util.List;



import static android.Manifest.permission.READ_CONTACTS;



/**

 * A login screen that offers login via email/password.

 */

public class MainActivity extends AppCompatActivity {





    // UI references.

    private EditText mEmailView;

    private EditText mPasswordView;



    private CheckBox checkBoxRememberMe;



    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        // Set up the login form.

        mEmailView = (EditText) findViewById(R.id.email);

        mPasswordView = (EditText) findViewById(R.id.password);

        mPasswordView.setOnEditorActionListener(new TextView.OnEditorActionListener() {

            @Override

            public boolean onEditorAction(TextView textView, int id, KeyEvent keyEvent) {

                if (id == R.id.login || id == EditorInfo.IME_NULL) {

                    attemptLogin();

                    return true;

                }

                return false;

            }

        });



        Button mEmailSignInButton = (Button) findViewById(R.id.email_sign_in_button);

        mEmailSignInButton.setOnClickListener(new OnClickListener() {

            @Override

            public void onClick(View view) {

                attemptLogin();

            }

        });



        checkBoxRememberMe = (CheckBox) findViewById(R.id.checkBoxRememberMe);

        //Here we will validate saved preferences

        if (!new PrefManager(this).isUserLogedOut()) {

            //user's email and password both are saved in preferences

            startHomeActivity();

        }



    }





    /**

     * Attempts to sign in or register the account specified by the login form.

     * If there are form errors (invalid email, missing fields, etc.), the

     * errors are presented and no actual login attempt is made.

     */

    private void attemptLogin() {



        // Reset errors.

        mEmailView.setError(null);

        mPasswordView.setError(null);



        // Store values at the time of the login attempt.

        String email = mEmailView.getText().toString();

        String password = mPasswordView.getText().toString();



        boolean cancel = false;

        View focusView = null;



        // Check for a valid password, if the user entered one.

        if (!TextUtils.isEmpty(password) && !isPasswordValid(password)) {

            mPasswordView.setError(getString(R.string.error_invalid_password));

            focusView = mPasswordView;

            cancel = true;

        }



        // Check for a valid email address.

        if (TextUtils.isEmpty(email)) {

            mEmailView.setError(getString(R.string.error_field_required));

            focusView = mEmailView;

            cancel = true;

        } else if (!isEmailValid(email)) {

            mEmailView.setError(getString(R.string.error_invalid_email));

            focusView = mEmailView;

            cancel = true;

        }



        if (cancel) {

            // There was an error; don't attempt login and focus the first

            // form field with an error.

            focusView.requestFocus();

        } else {

            // save data in local shared preferences

            if (checkBoxRememberMe.isChecked())

                saveLoginDetails(email, password);

            startHomeActivity();

        }

    }



    private void startHomeActivity() {

        Intent intent = new Intent(this, HomeActivity.class);

        startActivity(intent);

        finish();

    }



    private void saveLoginDetails(String email, String password) {

        new PrefManager(this).saveLoginDetails(email, password);

    }





    private boolean isEmailValid(String email) {

        //TODO: Replace this with your own logic

        return email.contains("@");

    }



    private boolean isPasswordValid(String password) {

        //TODO: Replace this with your own logic

        return password.length() > 4;

    }

}

 

 

2.activity_main.xml:

<LinearLayout 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"
    android:gravity="center_horizontal"
    android:orientation="vertical"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity">

    <!-- Login progress -->
    <ProgressBar
        android:id="@+id/login_progress"
        style="?android:attr/progressBarStyleLarge"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginBottom="8dp"
        android:visibility="gone"/>

    <ScrollView
        android:id="@+id/login_form"
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        <LinearLayout
            android:id="@+id/email_login_form"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="vertical">

            <android.support.design.widget.TextInputLayout
                android:layout_width="match_parent"
                android:layout_height="wrap_content">

                <EditText
                    android:id="@+id/email"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:hint="@string/prompt_email"
                    android:inputType="textEmailAddress"
                    android:maxLines="1"
                    android:singleLine="true"/>

            </android.support.design.widget.TextInputLayout>

            <android.support.design.widget.TextInputLayout
                android:layout_width="match_parent"
                android:layout_height="wrap_content">

                <EditText
                    android:id="@+id/password"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:hint="@string/prompt_password"
                    android:imeActionId="@+id/login"
                    android:imeActionLabel="@string/action_sign_in_short"
                    android:imeOptions="actionUnspecified"
                    android:inputType="textPassword"
                    android:maxLines="1"
                    android:singleLine="true"/>

            </android.support.design.widget.TextInputLayout>

            <CheckBox
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:text="Remember Me"
                android:id="@+id/checkBoxRememberMe"/>

            <Button
                android:id="@+id/email_sign_in_button"
                style="?android:textAppearanceSmall"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginTop="16dp"
                android:text="@string/action_sign_in"
                android:textStyle="bold"/>

        </LinearLayout>
    </ScrollView>
</LinearLayout>

3.PrefManager.java:

package com.akash.sharedpreferance;



import android.content.Context;

import android.content.SharedPreferences;



/**

 * Class for Shared Preference

 */

public class PrefManager {



    Context context;



    PrefManager(Context context) {

        this.context = context;

    }



    public void saveLoginDetails(String email, String password) {

        SharedPreferences sharedPreferences = context.getSharedPreferences("LoginDetails", Context.MODE_PRIVATE);

        SharedPreferences.Editor editor = sharedPreferences.edit();

        editor.putString("Email", email);

        editor.putString("Password", password);

        editor.commit();

    }



    public String getEmail() {

        SharedPreferences sharedPreferences = context.getSharedPreferences("LoginDetails", Context.MODE_PRIVATE);

        return sharedPreferences.getString("Email", "");

    }



    public boolean isUserLogedOut() {

        SharedPreferences sharedPreferences = context.getSharedPreferences("LoginDetails", Context.MODE_PRIVATE);

        boolean isEmailEmpty = sharedPreferences.getString("Email", "").isEmpty();

        boolean isPasswordEmpty = sharedPreferences.getString("Password", "").isEmpty();

        return isEmailEmpty || isPasswordEmpty;

    }

}
 

4.HomeActivity.java:

package com.akash.sharedpreferance;



import androidx.appcompat.app.AppCompatActivity;



import android.os.Bundle;



public class HomeActivity extends AppCompatActivity {



    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_home);

    }

}

 


5.activity_home.xml:
<?xml version="1.0" encoding="utf-8"?>

<RelativeLayout

    xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:app="http://schemas.android.com/apk/res-auto"

    xmlns:tools="http://schemas.android.com/tools"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:paddingBottom="@dimen/activity_vertical_margin"

    android:paddingLeft="@dimen/activity_horizontal_margin"

    android:paddingRight="@dimen/activity_horizontal_margin"

    android:paddingTop="@dimen/activity_vertical_margin"

    app:layout_behavior="@string/appbar_scrolling_view_behavior"

    tools:context=".HomeActivity"

    tools:showIn="@layout/activity_home">



    <TextView

        android:id="@+id/textViewUser"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_centerInParent="true"

        android:gravity="center"

        android:text="Welcome"/>





</RelativeLayout>



6.Dimen.xml:
 <resources>

    <!-- Default screen margins, per the Android Design guidelines. -->

    <dimen name="activity_horizontal_margin">16dp</dimen>

    <dimen name="activity_vertical_margin">16dp</dimen>

    <dimen name="nav_header_vertical_spacing">8dp</dimen>

    <dimen name="nav_header_height">176dp</dimen>

    <dimen name="fab_margin">16dp</dimen>

</resources>


7.manifest.xml:

<?xml version="1.0" encoding="utf-8"?>

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

    package="com.akash.sharedpreferance">



    <application

        android:allowBackup="true"

        android:icon="@mipmap/ic_launcher"

        android:label="@string/app_name"

        android:roundIcon="@mipmap/ic_launcher_round"

        android:supportsRtl="true"

        android:theme="@style/AppTheme">

        <activity android:name=".HomeActivity"></activity>

        <activity android:name=".MainActivity">

            <intent-filter>

                <action android:name="android.intent.action.MAIN" />



                <category android:name="android.intent.category.LAUNCHER" />

            </intent-filter>

        </activity>

    </application>



</manifest>