[android-developers] Broadcast receiver in foreground activity - not reliable?

I got a user reporting that our app does correctly terminate when the user's device exits car mode, but only when the activity that contains the receiver is not active. If the activity is in the foreground then more often than not our app does not terminate.

The activity is defined as

       <activity

            android:name=".MainScreen"

            android:alwaysRetainTaskState="true"

            android:configChanges="orientation"

            android:label="@string/app_name"

            android:launchMode="singleTask" >

            <intent-filter>

                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />

                <category android:name="android.intent.category.CAR_DOCK" />

                <category android:name="android.intent.category.CAR_MODE" />

            </intent-filter>

        </activity>

The receiver is very simple

private BroadcastReceiver undockReceiver = new BroadcastReceiver() {

@Override

public void onReceive(Context context, Intent intent) {

    if (intent.getAction().equals("android.app.action.EXIT_CAR_MODE")) {

    finish();

    }

}

    };

Is there a reason that the receiver does not work reliably?  Is it bad practice to put a receiver inside the main activity? or does it have to do with the activity flags?

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