activity
android:name=".WalkieTalkieActivity"
android:configChanges="orientation|keyboardHidden"
android:screenOrientation="portrait"
>
<intent-filter>
<action
android:name="android.intent.action.CALL" />
<data
android:scheme="tel" />
<category
android:name="android.intent.category.DEFAULT" />
<action
android:name="android.intent.action.CALL_PRIVILEGED" />
</intent-filter>
</activity>
By using above code we can add our application to default chooser application in android
