Wednesday, December 14, 2011

Android Login Application Using Shared Preferences Method

1).This is the main class.

LoginApp.java


package com.ex;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.EditText;
import android.widget.Toast;

public class LoginApp extends Activity implements OnClickListener
{
    private SharedPreferences sp;
           
    Intent i;
    Button b1,b2;
    EditText ed1,ed2,ed3,ed4;
    String user,pass,cpass,eid,chk;
    CheckBox ck;
    String stat="a";
   
   
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState)
    {
   
       
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
   
   
        ed1=(EditText)findViewById(R.id.edit1);
        ed2=(EditText)findViewById(R.id.edit2);
        ed3=(EditText)findViewById(R.id.edit3);
       
        b1=(Button)findViewById(R.id.button1);
        b2=(Button)findViewById(R.id.button2);
        ck=(CheckBox)findViewById(R.id.check1);      
        b1.setOnClickListener(this);
        b2.setOnClickListener(this);
        sp=this.getSharedPreferences("Register", MODE_WORLD_READABLE);
        chk=sp.getString("USERNAME", "");
        if(chk.length()!=0){
            sp=getSharedPreferences("Register",MODE_WORLD_WRITEABLE);
            Editor myEditor=sp.edit();
            myEditor.putString("Status", stat);
            myEditor.commit();
           
            i=new Intent(this,Register.class);
            startActivity(i);      
        }
       
    }

    public void onClick(View arg0) {
        user=ed1.getText().toString();
        pass=ed2.getText().toString();
        cpass=ed3.getText().toString();
        if(arg0==b1){
           
            if(ck.isChecked()){
               
           
            if((user.length()!=0))
            {
                if((pass.length()!=0))
                {
                    if(pass.compareTo(cpass)==0)
                            {
           
            sp=getSharedPreferences("Register",MODE_WORLD_WRITEABLE);
            Editor myEditor=sp.edit();
            myEditor.putString("USERNAME", user);
            myEditor.putString("PASSWORD", pass);
            myEditor.commit();
            Toast.makeText(this, "Registration is successfull",10000).show();
            i=new Intent(this,Register.class);
            startActivity(i);
            }
            else
            {
                Toast.makeText(this, "Password Mismatch", 10000).show();
            }
                   }
            else
                   {
                Toast.makeText(this, "Please Enter password", 10000).show();
               
            }
            }
            else{
                Toast.makeText(this,"Please Enter Username",10000).show();
            }
    }
            else{
                Toast.makeText(this, "Please Accept all our terms and conditions", 10000).show();
            }
        }
        else if(arg0==b2){
            AlertDialog.Builder builder=new AlertDialog.Builder(this);
              builder.setTitle("Exit");
             builder.setMessage("Do you want to exit");
        builder.setCancelable(false);
        builder.setPositiveButton("Yes",new DialogInterface.OnClickListener() {

public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
finish();
}
});
        builder.setNegativeButton("No", new DialogInterface.OnClickListener() {

                public void onClick(DialogInterface arg0, int arg1) {
                   arg0.cancel();
                }
            });
        AlertDialog alert=builder.create();
        alert.show();
           
        }
    }
}


2).The next Page is for Registration page

Register.java



/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
package com.ex;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.EditText;
import android.widget.TextView.BufferType;
import android.widget.Toast;

/**
 *
 * @author sonu
 */
public class Register extends Activity implements OnClickListener {
    private SharedPreferences sp;
    String user,pass;
    Button b1,b2,b3,b4;
    EditText ed1,ed2;
    Intent i;

    int flag=0;
 
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState)
    {
       
        super.onCreate(savedInstanceState);
        setContentView(R.layout.reg);
        b1=(Button)findViewById(R.id.button1);
        b2=(Button)findViewById(R.id.button2);
        b3=(Button)findViewById(R.id.button3);
        b4=(Button)findViewById(R.id.button4);
        ed1=(EditText)findViewById(R.id.edit1);
        ed2=(EditText)findViewById(R.id.edit2);
       chk=(CheckBox)findViewById(R.id.check1);
        b1.setOnClickListener(this);
        b4.setOnClickListener(this);
        b3.setOnClickListener(this);
        b2.setOnClickListener(this);

    }

    public void onClick(View arg0) {
     
        sp=this.getSharedPreferences("Register", MODE_WORLD_READABLE);
        user=sp.getString("USERNAME", "");
        pass=sp.getString("PASSWORD","");
       
       
        if(b1==arg0){
                if((ed1.getText().toString().compareTo(user)==0)&&                    (ed2.getText().toString().compareTo(pass)==0))
           
            {
              Toast.makeText(this, "You are Logged In", 20000).show();
               
               flag=1;
         
                }
 
            else
        {
                Toast.makeText(this, "Wrong Username or Password",20000).show();
                flag=0;
               
            }
           
    }
            else if ((b2==arg0 )&&(flag==1)){
                Intent intent;
              intent=new Intent(this,details.class);
                startActivity(intent);
             
                }
            else if((b2==arg0)&&(flag==0)){
                Toast.makeText(this, "You are not logged in", 10000).show();
            }
            else if(b3==arg0){
                Intent in;
                in=new Intent(this,Change.class);
                startActivity(in);
            }
           
           
            else if(b4==arg0){
                AlertDialog.Builder builder=new AlertDialog.Builder(this);
              builder.setTitle("Exit");
             builder.setMessage("Do you want to exit");
        builder.setCancelable(false);
        builder.setPositiveButton("Yes",new DialogInterface.OnClickListener() {

public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
finish();
}
});
        builder.setNegativeButton("No", new DialogInterface.OnClickListener() {

                public void onClick(DialogInterface arg0, int arg1) {
                   arg0.cancel();
                }
            });
        AlertDialog alert=builder.create();
        alert.show();
           
            }
           
        }
       
    }

3).The next code is for the my profile activity where you can see your profile

details.java


/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
package com.ex;

import android.app.Activity;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView.BufferType;

/**
 *
 * @author sonu
 */
public class details extends Activity implements OnClickListener {
    private SharedPreferences sp;
    String us,ps;
    EditText ed1,ed2;
    Button b;
    @Override
    public void onCreate(Bundle savedInstanceState)
    {
       
        super.onCreate(savedInstanceState);
        setContentView(R.layout.details);
        sp=this.getSharedPreferences("Register", MODE_WORLD_READABLE);
        us=sp.getString("USERNAME", "");
        ps=sp.getString("PASSWORD", "");
        ed1=(EditText)findViewById(R.id.edit1);
        ed2=(EditText)findViewById(R.id.edit2);
        ed1.setText(us);
        ed2.setText(ps);
        b=(Button)findViewById(R.id.button1);
        b.setOnClickListener(this);
       
    }
   

    public void onClick(View arg0) {
     
           Intent i;
           i=new Intent(this,Register.class);
           startActivity(i);
       
     
    }
   
   
}

4).The next activity is for changing the password. Here i have enable the view of the old password. You can change it .

Change.java


/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
package com.ex;

import android.app.Activity;
import android.content.Intent;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.*;

/**
 *
 * @author sonu
 */

public class Change extends Activity implements OnClickListener {
    EditText ed1,ed2,ed3;
    Button b1,b2;
    private SharedPreferences sp;
    String pass;
   

   
    @Override
    public void onCreate(Bundle savedInstanceState)
    {
       
        super.onCreate(savedInstanceState);
        setContentView(R.layout.change);
        ed1=(EditText)findViewById(R.id.edit1);
        ed2=(EditText)findViewById(R.id.edit2);
        ed3=(EditText)findViewById(R.id.edit3);
        sp=this.getSharedPreferences("Register", MODE_WORLD_READABLE);
        pass=sp.getString("PASSWORD", "");
        ed1.setText(pass);
        b1=(Button)findViewById(R.id.button1);
        b2=(Button)findViewById(R.id.button2);
        b1.setOnClickListener(this);
        b2.setOnClickListener(this);
    }

    public void onClick(View arg0) {
        String p=ed2.getText().toString();
        String c=ed3.getText().toString();
        sp=getSharedPreferences("Register", MODE_WORLD_WRITEABLE);
        Editor myeditor=sp.edit();
        if(arg0==b1){
            if(p.compareTo(c)==0){
            //myeditor.remove("PASSWORD");
               myeditor.putString("PASSWORD", p);
                myeditor.commit();
                Toast.makeText(this, "Password Changed", 20000).show();
                 Intent i=new Intent(this,Register.class);
            startActivity(i);
            }
            else
            {
                Toast.makeText(this, "Password Mismatch", 20000).show();
            }
        }
        else{
            Intent i=new Intent(this,Register.class);
            startActivity(i);
        }
    }
   
   
   
}

The layout for first activity "LoginApp.java"

main.xml



<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
android:id="@+id/widget31"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical"
xmlns:android="http://schemas.android.com/apk/res/android"
>
<TextView
android:id="@+id/widget44"
android:layout_width="240px"
android:layout_height="23px"
android:text="Welcome To Registration Page"
>
</TextView>
<LinearLayout
android:id="@+id/widget45"
android:layout_width="238px"
android:layout_height="42px"
>
<TextView
android:id="@+id/widget56"
android:layout_width="80px"
android:layout_height="wrap_content"
android:text="Username"
>
</TextView>
<EditText
android:id="@+id/edit1"
android:layout_width="154px"
android:layout_height="wrap_content"
android:textSize="18sp"
>
</EditText>
</LinearLayout>
<LinearLayout
android:id="@+id/widget47"
android:layout_width="238px"
android:layout_height="44px"
>
<TextView
android:id="@+id/widget60"
android:layout_width="80px"
android:layout_height="wrap_content"
android:text="Password"
>
</TextView>
<EditText
android:id="@+id/edit2"
android:layout_width="155px"
android:layout_height="wrap_content"
android:textSize="18sp"
android:password="true"
>
</EditText>
</LinearLayout>
<LinearLayout
android:id="@+id/widget62"
android:layout_width="237px"
android:layout_height="47px"
>
<TextView
android:id="@+id/widget63"
android:layout_height="wrap_content"
android:text="C.Password" android:layout_width="80px">
</TextView>
<EditText
android:id="@+id/edit3"
android:layout_width="152px"
android:layout_height="wrap_content"
android:textSize="18sp"
android:password="true"
>
</EditText>
</LinearLayout>
<LinearLayout
android:id="@+id/widget65"
android:layout_width="237px"
android:layout_height="49px"
android:orientation="vertical"
>
<CheckBox
android:id="@+id/check1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="I Accept all the terms and Conditions"
>
</CheckBox>
</LinearLayout>
<LinearLayout
android:id="@+id/widget67"
android:layout_width="235px"
android:layout_height="47px"
>
<Button
android:id="@+id/button1"
android:layout_width="114px"
android:layout_height="wrap_content"
android:text="Sign Up"
>
</Button>
<Button
android:id="@+id/button2"
android:layout_width="120px"
android:layout_height="wrap_content"
android:text="Exit"
>
</Button>
</LinearLayout>
</LinearLayout>

The layout for second activity Register.java

reg.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
android:id="@+id/widget31"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical"
xmlns:android="http://schemas.android.com/apk/res/android"
>
<LinearLayout
android:id="@+id/widget70"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical"
>
<TextView
android:id="@+id/widget71"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Welcome to Login Page"
>
</TextView>
</LinearLayout>
<LinearLayout
android:id="@+id/widget72"
android:layout_width="240px"
android:layout_height="46px"
>
<TextView
android:id="@+id/widget73"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Username"
>
</TextView>
<EditText
android:id="@+id/edit1"
android:layout_width="170px"
android:layout_height="wrap_content"
android:textSize="18sp"
>
</EditText>
</LinearLayout>
<LinearLayout
android:id="@+id/widget75"
android:layout_width="239px"
android:layout_height="54px"
>
<TextView
android:id="@+id/widget76"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Password"
>
</TextView>
<EditText
android:id="@+id/edit2"
android:layout_width="170px"
android:layout_height="wrap_content"
android:textSize="18sp"
android:password="true"
>
</EditText>
</LinearLayout>
<Button
android:id="@+id/button1"
android:layout_width="113px"
android:layout_height="wrap_content"
android:text="Login"
>
</Button>
<Button
android:id="@+id/button2"
android:layout_width="119px"
android:layout_height="wrap_content"
android:text="My Profile"
>
</Button>
</LinearLayout>
<LinearLayout
android:id="@+id/widget82"
android:layout_width="238px"
android:layout_height="47px"
>
<Button
android:id="@+id/button3"
android:layout_width="115px"
android:layout_height="wrap_content"
android:text="Forgot Password"
>
</Button>
<Button
android:id="@+id/button4"
android:layout_width="115px"
android:layout_height="wrap_content"
android:text="Exit"
>
</Button>
</LinearLayout>
</LinearLayout>

For Third activity details.java

details.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
android:id="@+id/widget31"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical"
xmlns:android="http://schemas.android.com/apk/res/android"
>
<LinearLayout
android:id="@+id/widget32"
android:layout_width="320px"
android:layout_height="45px"
>
<TextView
android:id="@+id/widget33"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Username"
>
</TextView>
<EditText
android:id="@+id/edit1"
android:layout_height="wrap_content"
android:textSize="18sp"
android:layout_width="190px">
</EditText>
</LinearLayout>
<LinearLayout
android:id="@+id/widget35"
android:layout_width="320px"
android:layout_height="52px"
>
<TextView
android:id="@+id/widget36"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Password"
>
</TextView>
<EditText
android:id="@+id/edit2"
android:layout_height="wrap_content"
android:textSize="18sp" android:layout_width="190px">
</EditText>
</LinearLayout>
<Button
android:id="@+id/button1"
android:layout_height="wrap_content"
android:text="Back"
android:layout_width="240px">
</Button>
</LinearLayout>

For fourth activity "Change.java"

change.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
android:id="@+id/widget31"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical"
xmlns:android="http://schemas.android.com/apk/res/android"
>
<LinearLayout
android:id="@+id/widget32"
android:layout_width="320px"
android:layout_height="50px"
>
<TextView
android:id="@+id/widget33"
android:layout_width="117px"
android:layout_height="wrap_content"
android:text="Old Password"
>
</TextView>
<EditText
android:id="@+id/edit1"
android:layout_height="wrap_content"
android:textSize="18sp" android:layout_width="120px">
</EditText>
</LinearLayout>
<LinearLayout
android:id="@+id/widget35"
android:layout_width="320px"
android:layout_height="55px"
>
<TextView
android:id="@+id/widget37"
android:layout_width="119px"
android:layout_height="wrap_content"
android:text="New Password"
>
</TextView>
<EditText
android:id="@+id/edit2"
android:layout_height="wrap_content"
android:textSize="18sp"
android:password="true"
android:layout_width="120px">
</EditText>
</LinearLayout>
<LinearLayout
android:id="@+id/widget36"
android:layout_width="313px"
android:layout_height="57px"
>
<TextView
android:id="@+id/widget39"
android:layout_height="wrap_content"
android:text="Confirm Password" android:layout_width="120px">
</TextView>
<EditText
android:id="@+id/edit3"
android:layout_height="wrap_content"
android:textSize="18sp"
android:password="true"
android:layout_width="120px">
</EditText>
</LinearLayout>
<Button
android:id="@+id/button1"
android:layout_height="wrap_content"
android:text="Change Password" android:layout_width="240px">
</Button>
<Button
android:id="@+id/button2"
android:layout_height="wrap_content"
android:text="Back"
android:layout_width="240px">
</Button>
</LinearLayout>


For more queries email me at sonulohani@yahoo.com.
Thankyou. Please comment for improvement. 





Posted by at

2 comments:

  1. TejasviSeptember 28, 2012 at 7:59 AM

    It helped me a lot.. Thanku

    ReplyDelete
    Replies
    1. UnknownJuly 2, 2020 at 6:06 PM

      hey bro thank you for code but I do have a small problem, if I try to run the code on my phone the App stop Please help

      Delete

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