Making an activity the default activity

To make an activity the default/main activity for your app, just edit the AndroidManifest.xml file and add following intent filter to that activity definition.

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

For example, to make HomeActivity default, the Android Manifest would be modified as follows:

 <activity android:name=".HomeActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN"/>
                <category android:name="android.intent.category.LAUNCHER"/>
            </intent-filter>
</activity>