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这是我在这里的第一个问题，我搜索答案但没有找到。我构建了一个简单的应用程序，它可以获取当前位置，如果我站在特定位置会发出警报，但警报没有触发，请帮忙。这是我的代码：

主要活动：

package com.lda.notyalert;


public class MainActivity extends Activity {

    ProximityIntentReceiver proximityIntentReceiver;
    private static final String PROXIMITY_ALERT = "com.lda.notyalert.ProximityIntentReceiver";

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        LocationManager locationManager;
        String svcName = Context.LOCATION_SERVICE;
        locationManager = (LocationManager) getSystemService(svcName);

        Criteria criteria = new Criteria();
        criteria.setAccuracy(Criteria.ACCURACY_FINE);
        criteria.setPowerRequirement(Criteria.POWER_LOW);
        criteria.setAltitudeRequired(false);
        criteria.setBearingRequired(false);
        criteria.setSpeedRequired(false);
        criteria.setCostAllowed(true);
        String provider = locationManager.getBestProvider(criteria, true);

        Location l = locationManager.getLastKnownLocation(provider);

        updateWithNewLocation(l);

        locationManager.requestLocationUpdates(provider, 2000, 10,
                locationListener);

        setProximityAlert();
        IntentFilter filter = new IntentFilter(PROXIMITY_ALERT);
        proximityIntentReceiver = new ProximityIntentReceiver();
        registerReceiver(proximityIntentReceiver, filter);
    }

    private void setProximityAlert() {
        String locService = Context.LOCATION_SERVICE;
        LocationManager locationManager;
        locationManager = (LocationManager) getSystemService(locService);

        double lat = 37.422006;
        double lng = -122.084095;
        float radius = 100f; // meters
        long expiration = -1; // do not expire

        Intent intent = new Intent(PROXIMITY_ALERT);
        PendingIntent proximityIntent = PendingIntent.getBroadcast(this, -1,
                intent, 0);
        locationManager.addProximityAlert(lat, lng, radius, expiration,
                proximityIntent);

    }

    private void updateWithNewLocation(Location location) {
        TextView myLocationText;
        myLocationText = (TextView) findViewById(R.id.textView1);

        String latLongString = "No location found";
        if (location != null) {
            double lat = location.getLatitude();
            double lng = location.getLongitude();
            latLongString = "Lat:" + lat + "\nLong:" + lng;
        }

        myLocationText.setText("Your Current Position is:\n" + latLongString);
    }

    private final LocationListener locationListener = new LocationListener() {
        public void onLocationChanged(Location location) {
            updateWithNewLocation(location);
        }

        public void onProviderDisabled(String provider) {
        }

        public void onProviderEnabled(String provider) {
        }

        public void onStatusChanged(String provider, int status, Bundle extras) {
        }
    };

}

这是扩展 BroadcastReceiver 的 ProximityIntentReceiver；

package com.lda.notyalert;


public class ProximityIntentReceiver extends BroadcastReceiver {

     private static final int NOTIFICATION_ID = 1000;


    @SuppressWarnings("deprecation")
    @Override
    public void onReceive(Context context, Intent intent) {
        String key = LocationManager.KEY_PROXIMITY_ENTERING;

        boolean entering = intent.getBooleanExtra(key, false);
        if (entering) {

            Log.d(getClass().getSimpleName(), "entering");
        } else {
            Log.d(getClass().getSimpleName(), "exiting");
        }

        NotificationManager notificationManager = (NotificationManager) context
                .getSystemService(Context.NOTIFICATION_SERVICE);

        PendingIntent pendingIntent = PendingIntent.getActivity(context, 0,
                null, 0);
        Notification notification = createNotification();
        notification.setLatestEventInfo(context, "Proximity Alert!",
                "You are near your point of interest.", pendingIntent);

        notificationManager.notify(NOTIFICATION_ID, notification);

    }

    private Notification createNotification() {
        Notification notification = new Notification();

        notification.icon = R.drawable.ic_launcher;
        notification.when = System.currentTimeMillis();
        notification.flags |= Notification.FLAG_AUTO_CANCEL;
        notification.flags |= Notification.FLAG_SHOW_LIGHTS;
        notification.defaults |= Notification.DEFAULT_VIBRATE;
        notification.defaults |= Notification.DEFAULT_LIGHTS;
        notification.ledARGB = Color.WHITE;
        notification.ledOnMS = 1500;
        notification.ledOffMS = 1500;

        return notification;

    }

}
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