package com.example.button_activity;

import android.app.Activity;

import android.content.Intent;

import android.os.Bundle;

import android.view.Menu;

import android.view.MenuItem;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

public class MainActivity extends Activity {

    private Button myButton = null;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        myButton = (Button)findViewById(R.id.myButton);

        myButton.setOnClickListener(new MyButtonListener());

    }

    class MyButtonListener implements OnClickListener{

        @Override

        public void onClick(View v) {

            // TODO Auto-generated method stub

        Intent intent = new Intent();

        intent.setClass(MainActivity.this, OtherActivity.class);

        MainActivity.this.startActivity(intent);

        }

    }

}

package com.example.button_activity;

import android.app.Activity;

import android.os.Bundle;

import android.widget.TextView;

public class OtherActivity extends Activity{

    private TextView myTextView = null;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        // TODO Auto-generated method stub

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_other);

        myTextView = (TextView)findViewById(R.id.myTextView);

        myTextView.setText(R.string.other);

    }

}

<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"

    tools:context="${relativePackage}.${activityClass}" >

    <TextView

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:text="@string/hello_world" />

    <Button

        android:id="@+id/myButton"

        android:layout_width="fill_parent"

        android:layout_height="wrap_content"

        />

</RelativeLayout>

<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"

    tools:context="${relativePackage}.${activityClass}" >

    <TextView

        android:id="@+id/myTextView"

        android:layout_width="fill_parent"

        android:layout_height="wrap_content"

        android:text="@string/hello_world" />

</RelativeLayout>

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

<resources>

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

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

    <string name="other">OtherActivity</string>

</resources>

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

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

    package="com.example.button_activity"

    android:versionCode="1"

    android:versionName="1.0" >

    <uses-sdk

        android:minSdkVersion="8"

        android:targetSdkVersion="21" />

    <application

        android:allowBackup="true"

        android:icon="@drawable/ic_launcher"

        android:label="@string/app_name"

        android:theme="@style/AppTheme" >

        <activity

            android:name=".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=".OtherActivity"

            android:label="@string/other" >

        </activity>

    </application>

</manifest>