How to toast a simple message when you walk into a Geofence?
<p>So im completely new to geofences, and I followed the following tutorial on setting up geofences: <a href="http://io2015codelabs.appspot.com/codelabs/geofences#4" rel="nofollow">http://io2015codelabs.appspot.com/codelabs/geofences#4</a> .</p>

<p>The code ran, but when I walk into a geo fence nothing happens... How would i toast something as I enter or leave a geofence? My code is exactly like the one in the guide. So I hope you guys can help me with some example. I</p>

<p>here is geo fence class:</p>

<pre><code>public class GeoFence extends AppCompatActivity implements
        GoogleApiClient.ConnectionCallbacks,
        GoogleApiClient.OnConnectionFailedListener,
        ResultCallback&lt;Status&gt;
{
    protected ArrayList&lt;Geofence&gt; mGeofenceList;
    protected GoogleApiClient mGoogleApiClient;
    private Button mAddGeofencesButton;

    @Override
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_geo_fence);
        mAddGeofencesButton = (Button) findViewById(R.id.add_geofences_button);
        // Empty list for storing geofences.
        mGeofenceList = new ArrayList&lt;Geofence&gt;();

        // Get the geofences used. Geofence data is hard coded in this sample.
        populateGeofenceList();

        // Kick off the request to build GoogleApiClient.
        buildGoogleApiClient();

    }

    public void populateGeofenceList() {
        for (Map.Entry&lt;String, LatLng&gt; entry : Constants.LANDMARKS.entrySet()) {
            mGeofenceList.add(new Geofence.Builder()
                    .setRequestId(entry.getKey())
                    .setCircularRegion(
                            entry.getValue().latitude,
                            entry.getValue().longitude,
                            Constants.GEOFENCE_RADIUS_IN_METERS
                    )
                    .setExpirationDuration(Constants.GEOFENCE_EXPIRATION_IN_MILLISECONDS)
                    .setTransitionTypes(Geofence.GEOFENCE_TRANSITION_ENTER |
                            Geofence.GEOFENCE_TRANSITION_EXIT)
                    .build());
        }
    }
    protected synchronized void buildGoogleApiClient() {
        mGoogleApiClient = new GoogleApiClient.Builder(this)
                .addConnectionCallbacks(this)
                .addOnConnectionFailedListener(this)
                .addApi(LocationServices.API)
                .build();
    }
    public void addGeofencesButtonHandler(View view) {
        if (!mGoogleApiClient.isConnected()) {
            Toast.makeText(this, "Google API Client not connected!", Toast.LENGTH_SHORT).show();
            return;
        }

        try {
            LocationServices.GeofencingApi.addGeofences(
                    mGoogleApiClient,
                    getGeofencingRequest(),
                    getGeofencePendingIntent()
            ).setResultCallback(this); // Result processed in onResult().
        } catch (SecurityException securityException) {
            // Catch exception generated if the app does not use ACCESS_FINE_LOCATION permission.
        }
    }
    private GeofencingRequest getGeofencingRequest() {
        GeofencingRequest.Builder builder = new GeofencingRequest.Builder();
        builder.setInitialTrigger(GeofencingRequest.INITIAL_TRIGGER_ENTER);
        builder.addGeofences(mGeofenceList);
        return builder.build();
    }
    private PendingIntent getGeofencePendingIntent() {
        Intent intent = new Intent(this, GTIS.class);
        // We use FLAG_UPDATE_CURRENT so that we get the same pending intent back when calling addgeoFences()
        return PendingIntent.getService(this, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);
    }
    @Override
    public void onConnected(Bundle connectionHint) {

    }

    @Override
    public void onConnectionFailed(ConnectionResult result) {
        // Do something with result.getErrorCode());
    }
    @Override
    public void onConnectionSuspended(int cause) {
        mGoogleApiClient.connect();
    }
    @Override
    protected void onStart() {
        super.onStart();
        if (!mGoogleApiClient.isConnecting() || !mGoogleApiClient.isConnected()) {
            mGoogleApiClient.connect();
        }
    }

    @Override
    protected void onStop() {
        super.onStop();
        if (mGoogleApiClient.isConnecting() || mGoogleApiClient.isConnected()) {
            mGoogleApiClient.disconnect();
        }
    }

    public void onResult(Status status)
    {
        if (status.isSuccess()) {
            Toast.makeText(
                    this,
                    "Geofences Added",
                    Toast.LENGTH_SHORT
            ).show();
        } else {
           Toast.makeText(this,"No geo fence :(",Toast.LENGTH_SHORT).show();
        }
    }
}
</code></pre>

<p>Here is the GeofenceTransitionsIntentService class</p>

<pre><code>public class GTIS extends IntentService
{
    protected static final String TAG = "GeofenceTransitionsIS";

    public GTIS() {
        super(TAG);  // use TAG to name the IntentService worker thread
    }

    @Override
    protected void onHandleIntent(Intent intent) {
        GeofencingEvent event = GeofencingEvent.fromIntent(intent);
        if (event.hasError()) {
            Log.e(TAG, "GeofencingEvent Error: " + event.getErrorCode());
            String description = getGeofenceTransitionDetails(event);
            sendNotification(description);
            return;
        }
    }
    private static String getGeofenceTransitionDetails(GeofencingEvent event) {
        String transitionString =
                GeofenceStatusCodes.getStatusCodeString(event.getGeofenceTransition());
        List triggeringIDs = new ArrayList();
        for (Geofence geofence : event.getTriggeringGeofences()) {
            triggeringIDs.add(geofence.getRequestId());
        }
        return String.format("%s: %s", transitionString, TextUtils.join(", ", triggeringIDs));
    }

    private void sendNotification(String notificationDetails) {
        // Create an explicit content Intent that starts MainActivity.
        Intent notificationIntent = new Intent(getApplicationContext(), Geofence.class);

        // Get a PendingIntent containing the entire back stack.
        TaskStackBuilder stackBuilder = TaskStackBuilder.create(this);
        stackBuilder.addParentStack(GeoFence.class).addNextIntent(notificationIntent);
        PendingIntent notificationPendingIntent =
                stackBuilder.getPendingIntent(0, PendingIntent.FLAG_UPDATE_CURRENT);

        // Get a notification builder that's compatible with platform versions &gt;= 4
        NotificationCompat.Builder builder = new NotificationCompat.Builder(this);

        // Define the notification settings.
        builder.setColor(Color.RED)
                .setContentTitle(notificationDetails)
                .setContentText("Click notification to return to App")
                .setContentIntent(notificationPendingIntent)
                .setAutoCancel(true);

        // Fire and notify the built Notification.
        NotificationManager notificationManager =
                (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
        notificationManager.notify(0, builder.build());
    }

}
</code></pre>

<p>Here is my constants class:</p>

<pre><code>public class Constants
{
    public static final long GEOFENCE_EXPIRATION_IN_MILLISECONDS = 12 * 60 * 60 * 1000;
    public static final float GEOFENCE_RADIUS_IN_METERS = 20;

    public static final HashMap&lt;String, LatLng&gt; LANDMARKS = new HashMap&lt;String, LatLng&gt;();
    static {
        // San Francisco International Airport.
        LANDMARKS.put("Westwood", new LatLng(34.067313, -118.461164)); //34.065767, -118.459658  LANDMARKS.put("Westwood", new LatLng(34.065767,  -118.459658));

        // Googleplex.
        LANDMARKS.put("Japantown", new LatLng(37.785281,-122.4296384));

        // Test
        LANDMARKS.put("SFO", new LatLng(37.621313,-122.378955));
    }
}
</code></pre>