sample application with login module. (Check username and password) On successful login, go to next screen. And on failing login, alert user using Toast

Code File (. java file)

MainActivity.java

package com.dce.practical1;

 

import java.util.RandomAccess;

 

import android.os.Bundle;

import android.app.Activity;

import android.content.ContentProvider;

import android.content.Intent;

import android.view.Menu;

import android.view.View;

import android.widget.EditText;

import android.widget.Toast;

 

public class MainActivity extends Activity {

 

       EditText edt;

       EditText edt1;

       @Override

       protected void onCreate(Bundle savedInstanceState) {

              super.onCreate(savedInstanceState);

              setContentView(R.layout.activity_main);

       }

 

       @Override

       public boolean onCreateOptionsMenu(Menu menu) {

              // Inflate the menu; this adds items to the action bar if it is present.

              getMenuInflater().inflate(R.menu.main, menu);

              return true;

       }

       public void btn_click(View v) {

              edt=(EditText)findViewById(R.id.editText1);

              edt1=(EditText)findViewById(R.id.editText2);

              //Toast.makeText(this,edt.getText().toString(),Toast.LENGTH_LONG).show();

              String uname=edt.getText().toString();

              String pass=edt1.getText().toString();

              if(uname.equals("admin") && pass.equals("admin"))

              {

             

              Toast.makeText(this,"Login Successfully",Toast.LENGTH_LONG).show();

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

              a.putExtra("uname",uname);

              startActivity(a);

              }

              else

              {

                     Toast.makeText(this,"Enter Valid username and password",Toast.LENGTH_LONG).show();

              }

       }

 

}

HomeActivity.java

package com.dce.practical1;



import java.util.RandomAccess;



import android.os.Bundle;

import android.app.Activity;

import android.view.Menu;

import android.view.View;

import android.widget.EditText;

import android.widget.TextView;

import android.widget.Toast;



public class HomeActivity extends Activity {



TextView txt;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_home);

txt=(TextView)findViewById(R.id.textView1);

Bundle bundle = getIntent().getExtras();

String message = bundle.getString("uname");

txt.setText("Welcome " + message + "!!");

}



@Override

public boolean onCreateOptionsMenu(Menu menu) {

// Inflate the menu; this adds items to the action bar if it is present.

getMenuInflater().inflate(R.menu.main, menu);

return true;

}





}

Design File (.xml file)

activity_main.xml

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

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

android:layout_width="match_parent"

android:layout_height="match_parent" >



<TextView

android:id="@+id/textView1"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_centerHorizontal="true"

android:layout_centerVertical="true"

android:text="Hello World!"

android:textAppearance="?android:attr/textAppearanceLarge"

android:textColor="@color/Red" />



</RelativeLayout>



Activity_home.xml

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

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

android:layout_width="match_parent"

android:layout_height="match_parent" >



<TextView

android:id="@+id/textView1"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_centerHorizontal="true"

android:layout_centerVertical="true"

android:text="welcome admin!!!!!!!!!"

android:textAppearance="?android:attr/textAppearanceLarge"

android:textColor="@color/Red" />



</RelativeLayout>



String.xml

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

<resources>



<string name="app_name">Practical1</string>

<string name="action_settings">Settings</string>

<string name="hello_world">Hello world!</string>

<color name="Red">#FF0000</color>

<color name="White">#FFFFFF</color>

<string name="Username">Name :</string>

<string name="Login">Login</string>



</resources>



AndroidMainfest.xml



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

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

package="com.dce.practical1"

android:versionCode="1"

android:versionName="1.0" >



<uses-sdk

android:minSdkVersion="8"

android:targetSdkVersion="17" />



<application

android:allowBackup="true"

android:icon="@drawable/ic_launcher"

android:label="@string/app_name"

android:theme="@style/AppTheme" >

<activity

android:name="com.dce.practical1.MainActivity"

android:label="@string/app_name" >

<intent-filter>

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



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

</intent-filter>

</activity>

<activity

android:name="com.dce.practical1.HomeActivity"

android:label="@string/app_name" >

<intent-filter>

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



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

</intent-filter>

</activity>

</application>



</manifest>

Output