How to build sample apps for Android libraries with just a few lines of code

manifest.xml

<application
  android:theme="@style/AppTheme">
  
  <activity android:name="com.psoffritti.librarysampleapptemplate.core.SampleAppTemplateActivity" />  
  
  <activity android:name=".MainActivity">
      <intent-filter>
          <action android:name="android.intent.action.MAIN" />
          <category android:name="android.intent.category.LAUNCHER" />
      </intent-filter>
  </activity>
  
  <activity android:name=".ExampleActivity1" />
  <activity android:name=".ExampleActivity2" android:theme="@style/Base.Theme.MaterialComponents.Light.DarkActionBar"/>
  
</application>