Apply Android Holo Theme

To apply Theme for Application (or individual activity), you can add android:theme property under <application> (or <activity>) in AndroidManifest.xml. Android 3.0 (API Level 11) or higher, the platform provide a new holographic theme. To apply this newer theme, modify AndroidManifest.xml:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.exercise.AndroidDualFragment"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk android:minSdkVersion="11" />

    <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name" 
        android:theme="@android:style/Theme.Holo" >
        <activity
            android:name=".AndroidDualFragmentActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

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

</manifest>