Merge "Add InCallService docs to state prerequisites for be being a dialer app."

 * </service>

 * }

 * </pre>

 * <p>

 * In addition to implementing the {@link InCallService} API, you must also declare an activity in

 * your manifest which handles the {@link Intent#ACTION_DIAL} intent.  The example below illustrates

 * how this is done:

 * <pre>

 * {@code

 * <activity android:name="your.package.YourDialerActivity"

 *           android:label="@string/yourDialerActivityLabel">

 *      <intent-filter>

 *           <action android:name="android.intent.action.DIAL" />

 *           <category android:name="android.intent.category.DEFAULT" />

 *      </intent-filter>

 * </activity>

 * }

 * </pre>

 * <p>

 * When a user installs your application and runs it for the first time, you should prompt the user

 * to see if they would like your application to be the new default phone app.  See the

 * {@link TelecomManager#ACTION_CHANGE_DEFAULT_DIALER} intent documentation for more information on

 * how to do this.

 */

public abstract class InCallService extends Service {