Start Activity from Activity

Some time we need to start an Activity from Activity..
how can we achieve this i am going to write step by step.

We will create very simple app to do this work
 -------------------------------------------
App Name: Activity2Activity
Package Name: com.rdc
Android SDK: Android SDK 2.3.3 / API 10
Default Activity Name: FirstActivity
-------------------------------------------


FirstActivity.java

package com.rdc;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class FirstActivity extends Activity implements OnClickListener {
 
 @Override
 public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.first);

  Button btnload = (Button) findViewById(R.id.btnfirst);
  btnload.setOnClickListener(this);

 }

 @Override
 public void onClick(View v) {
  Intent i = new Intent(FirstActivity.this, SecondActivity.class);
  startActivity(i);
 }
}

SecondActivity.java

package com.rdc;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class SecondActivity extends Activity implements OnClickListener {
 @Override
 public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.second);

  Button btnload = (Button) findViewById(R.id.btnsecond);
  btnload.setOnClickListener(this);

 }

 @Override
 public void onClick(View v) {
  Intent i = new Intent(SecondActivity.this, FirstActivity.class);
  startActivity(i);
 }
}

first.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
 xmlns:android="http://schemas.android.com/apk/res/android"
 android:orientation="vertical"
 android:layout_width="fill_parent"
 android:layout_height="fill_parent">
 <TextView
  android:layout_width="fill_parent"
  android:text="I am first activity.."
  android:gravity="center"
  android:layout_height="62dp" />
 <LinearLayout
  android:id="@+id/layV"
  android:orientation="vertical"
  android:gravity="center"
  android:layout_width="fill_parent"
  android:layout_height="fill_parent">
  <Button
   android:text="Load Second Activity"
   android:layout_height="wrap_content"
   android:layout_width="wrap_content"
   android:id="@+id/btnfirst"></Button>
 </LinearLayout>

</LinearLayout>

second.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
 xmlns:android="http://schemas.android.com/apk/res/android"
 android:orientation="vertical"
 android:layout_width="fill_parent"
 android:layout_height="fill_parent">
 <TextView
  android:layout_width="fill_parent"
  android:text="I am Second activity.."
  android:gravity="center"
  android:layout_height="62dp" />
 <LinearLayout
  android:id="@+id/layV"
  android:orientation="vertical"
  android:gravity="center"
  android:layout_width="fill_parent"
  android:layout_height="fill_parent">
  <Button
   android:text="Load First Activity"
   android:layout_height="wrap_content"
   android:layout_width="wrap_content"
   android:id="@+id/btnsecond"></Button>
 </LinearLayout>

</LinearLayout>

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest
 xmlns:android="http://schemas.android.com/apk/res/android"
 package="com.rdc"
 android:versionCode="1"
 android:versionName="1.0">
 <uses-sdk android:minSdkVersion="10" />

 <application
  android:icon="@drawable/icon"
  android:label="@string/app_name">
 <activity
   android:name=".FirstActivity"
   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=".SecondActivity"
   android:label="@string/app_name">
 <intent-filter>
 <category android:name="android.intent.category.LAUNCHER" />
 </intent-filter>
 </activity>

 </application>
</manifest>

The output Screen will be like this..

You can download the complete source code zip file here : Activity2Activity

 cheers!!

 I'd love to hear your thoughts!