Here is source code of the Program to create Multiple Activities within an Application using Intent and a Thread. The project is successfully compiled and run on a Windows system using Eclipse ide. The program output is also shown below.

The Second Activity is called by the First Activity using startActivity() method which takes as input an intent object this intent object should be pointing towards the Second Activity in order to do that we create a new Intent object using intent class and within it specifying the Action name of the Second Activity which is set in the AndroidManifest.xml file.

Activity One



package com.example.creatingmultipleactivities;

import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.view.Menu;

public class MainActivity extends Activity {

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

public void run() {
try {
sleep(2000);
startActivity(new Intent(
"com.example.creatingmultipleactivities.second_activity"));
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

finally {
finish();
}
}
};
th.start();
}

@Override
protected void onPause() {
// TODO Auto-generated method stub
super.onPause();

}

@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;
}

}

Second Activity


package com.example.creatingmultipleactivities;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;

public class second_activity extends Activity{

@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.second);

}
@Override
protected void onPause() {
// TODO Auto-generated method stub
super.onPause();

}
}


Xml

First Activity Xml

<RelativeLayout 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: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"
android:background="@drawable/background">

<TextView
android:id="@+id/textView1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:layout_marginTop="39dp"
android:gravity="center_horizontal"
android:text="This is the first Activity"
android:textAppearance="?android:attr/textAppearanceLarge"
android:textSize="50sp" />

</RelativeLayout>


Second Activity Xml


<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:background="@drawable/background">

<TextView
android:id="@+id/textView1"
android:layout_width="match_parent"
android:layout_height="252dp"
android:text="This is Second Activity"
android:paddingTop="80dp"
android:gravity="center"
android:textAppearance="?android:attr/textAppearanceLarge"
android:textSize="40sp" />

</LinearLayout>


AndroidManifest

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.creatingmultipleactivities"
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.example.creatingmultipleactivities.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.example.creatingmultipleactivities.second_activity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="com.example.creatingmultipleactivities.second_activity" />

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

</manifest>