Shred Preferences - Githubissues

judaco commented 7 years ago

Create Persistent Data (for files)

package com.example.hackeru.sharedpreferences;

import android.app.Activity; import android.content.SharedPreferences; import android.support.v7.app.AppCompatActivity; import android.os.Bundle;

public class MainActivity extends Activity {

    public static final String MY_PREF = "MyPref";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        SharedPreferences sharedPreferences = getSharedPreferences(MY_PREF, MODE_PRIVATE);
        //how to write to shared preferences
        SharedPreferences.Editor editor = sharedPreferences.edit();
        editor.putString("username", "juda");
        editor.putInt("age", 27);
        editor.putString("nickname", "jude");
        editor.commit();

        //how to read from shred preferences

        String userName = sharedPreferences.getString("username", null);
        int age = sharedPreferences.getInt("age", -1);
        String nickName = sharedPreferences.getString("nickname", null);
    }
}

judaco commented 7 years ago

http://www.androidhive.info/2012/08/android-session-management-using-shared-preferences/

judaco commented 7 years ago

SessionManagement.java
package com.androidhive.sessions;

import java.util.HashMap;

import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;

public class SessionManager {
    // Shared Preferences
    SharedPreferences pref;

    // Editor for Shared preferences
    Editor editor;

    // Context
    Context _context;

    // Shared pref mode
    int PRIVATE_MODE = 0;

    // Sharedpref file name
    private static final String PREF_NAME = "AndroidHivePref";

    // All Shared Preferences Keys
    private static final String IS_LOGIN = "IsLoggedIn";

    // 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(PREF_NAME, PRIVATE_MODE);
        editor = pref.edit();
    }

    /**
     * Create login session
     * */
    public void createLoginSession(String name, String email){
        // Storing login value as TRUE
        editor.putBoolean(IS_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 wil check user login status
     * If false it will redirect user to login page
     * Else won't do anything
     * */
    public void checkLogin(){
        // Check login status
        if(!this.isLoggedIn()){
            // user is not logged in redirect him to Login Activity
            Intent i = new Intent(_context, LoginActivity.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);
        }

    }

    /**
     * Get stored session data
     * */
    public HashMap<String, String> getUserDetails(){
        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 data from Shared Preferences
        editor.clear();
        editor.commit();

        // After logout redirect user to Loing Activity
        Intent i = new Intent(_context, LoginActivity.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);
    }

    /**
     * Quick check for login
     * **/
    // Get Login State
    public boolean isLoggedIn(){
        return pref.getBoolean(IS_LOGIN, false);
  }
}

judaco commented 7 years ago

activity_login.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:orientation="vertical"
    android:padding="10dip">

    <!-- Email Label -->
    <TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="Username (Enter 'test')"
        android:singleLine="true"
        android:layout_marginBottom="5dip"/>

    <!-- Email input text -->
    <EditText android:id="@+id/txtUsername"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_marginBottom="10dip"/>

    <!-- Password Label -->
    <TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="Password (Enter 'test')"
        android:layout_marginBottom="5dip"/>

    <!-- Password input text -->
    <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"/>

    <!-- Login button -->
    <Button android:id="@+id/btnLogin"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="Login"/>

</LinearLayout>

judaco commented 7 years ago

LoginActivity.java
package com.androidhive.sessions;

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 LoginActivity extends Activity {

    // Email, password edittext
    EditText txtUsername, txtPassword;

    // login button
    Button btnLogin;

    // Alert Dialog Manager
    AlertDialogManager alert = new AlertDialogManager();

    // Session Manager Class
    SessionManager session;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_login); 

        // Session Manager
        session = new SessionManager(getApplicationContext());                

        // Email, Password input text
        txtUsername = (EditText) findViewById(R.id.txtUsername);
        txtPassword = (EditText) findViewById(R.id.txtPassword); 

        Toast.makeText(getApplicationContext(), "User Login Status: " + session.isLoggedIn(), Toast.LENGTH_LONG).show();

        // 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();

                // Check if username, password is filled                
                if(username.trim().length() > 0 && password.trim().length() > 0){
                    // For testing puspose username, password is checked with sample data
                    // username = test
                    // password = test
                    if(username.equals("test") && password.equals("test")){

                        // Creating user login session
                        // For testing i am stroing name, email as follow
                        // Use user real data
                        session.createLoginSession("Android Hive", "anroidhive@gmail.com");

                        // Staring MainActivity
                        Intent i = new Intent(getApplicationContext(), MainActivity.class);
                        startActivity(i);
                        finish();

                    }else{
                        // username / password doesn't match
                        alert.showAlertDialog(LoginActivity.this, "Login failed..", "Username/Password is incorrect", false);
                    }               
                }else{
                    // user didn't entered username or password
                    // Show alert asking him to enter the details
                    alert.showAlertDialog(LoginActivity.this, "Login failed..", "Please enter username and password", false);
                }

            }
        });
    }        
}

judaco commented 7 years ago

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:orientation="vertical"
    android:padding="10dip">

    <!-- Name Label -->
    <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"/>

    <!-- Email Label -->
    <TextView
        android:id="@+id/lblEmail"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:singleLine="true"
        android:layout_marginBottom="40dip"/>

    <!-- Button to show session data -->
    <Button android:id="@+id/btnLogout"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="Logout"/>
</LinearLayout>

judaco commented 7 years ago

package com.androidhive.sessions;

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 MainActivity extends Activity {

    // Alert Dialog Manager
    AlertDialogManager alert = new AlertDialogManager();

    // Session Manager Class
    SessionManager session;

    // Button Logout
    Button btnLogout;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        // 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.isLoggedIn(), Toast.LENGTH_LONG).show();

        /**
         * Call this function whenever you want to check user login
         * This will redirect user to LoginActivity is he is not
         * logged in
         * */
        session.checkLogin();

        // get user data from session
        HashMap<String, String> user = session.getUserDetails();

        // name
        String name = user.get(SessionManager.KEY_NAME);

        // email
        String email = user.get(SessionManager.KEY_EMAIL);

        // displaying user data
        lblName.setText(Html.fromHtml("Name: <b>" + name + "</b>"));
        lblEmail.setText(Html.fromHtml("Email: <b>" + email + "</b>"));

        /**
         * Logout button click event
         * */
        btnLogout.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View arg0) {
                // Clear the session data
                // This will clear all session data and 
                // redirect user to LoginActivity
                session.logoutUser();
            }
        });
    }     
}

judaco commented 7 years ago

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.androidhive.sessions"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="15" />

    <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name=".MainActivity"
            android:label="Dashboard Screen" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

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

        <!-- DashBoard / MainActivity -->
        <activity
            android:name=".LoginActivity"
            android:label="User Login" >
        </activity>
    </application>

</manifest>

judaco / Android

Shred Preferences #8