Android Studio，如果靠近位置，则会收到日期通知

Question

大家好，我必须在某个date 中获得一个notification，如果该应用的用户靠近某个事件。

我正在考虑使用 push notification，但我必须知道如何在我的应用中实现。

你有一些代码示例给我看吗？谢谢

我从 google 阅读了有关 GCM 以更轻松地发送通知的信息？它是如何工作的？

Answer 1

这是关于位置通知的小演示..

    public class AreWeThereIntentService extends IntentService {
    private final String TAG = AreWeThereIntentService.class.getName();
    private SharedPreferences prefs;
    private Gson gson;

    public AreWeThereIntentService() {
        super("AreWeThereIntentService");
    }

    @Override
    protected void onHandleIntent(Intent intent) {
        prefs = getApplicationContext().getSharedPreferences(
                Constants.SharedPrefs.Geofences, Context.MODE_PRIVATE);
        gson = new Gson();
        // 1. Get the event
        GeofencingEvent event = GeofencingEvent.fromIntent(intent);
        if (event != null) {
            if (event.hasError()) {
                onError(event.getErrorCode());
            } else {
                // 2. Get the transition type
                int transition = event.getGeofenceTransition();
                if (transition == Geofence.GEOFENCE_TRANSITION_ENTER ||
                        transition == Geofence.GEOFENCE_TRANSITION_DWELL ||
                        transition == Geofence.GEOFENCE_TRANSITION_EXIT) {
                    List<String> geofenceIds = new ArrayList<>();
                    // 3. Accumulate a list of event geofences
                    for (Geofence geofence : event.getTriggeringGeofences()) {
                        geofenceIds.add(geofence.getRequestId());
                    }
                    if (transition == Geofence.GEOFENCE_TRANSITION_ENTER ||
                            transition == Geofence.GEOFENCE_TRANSITION_DWELL) {
                        // 4. Pass the geofence list to the notification method
                        onEnteredGeofences(geofenceIds);
                    }
                }
            }
        }
    }

    private void onEnteredGeofences(List<String> geofenceIds) {
        // 1. Outer loop over all geofenceIds
        for (String geofenceId : geofenceIds) {
            String geofenceName = "";
            // 2, Loop over all geofence keys in prefs and retrieve NamedGeofence from SharedPreferences
            Map<String, ?> keys = prefs.getAll();
            for (Map.Entry<String, ?> entry : keys.entrySet()) {
                String jsonString = prefs.getString(entry.getKey(), null);
                NamedGeofence namedGeofence = gson.fromJson(jsonString, NamedGeofence.class);
                if (namedGeofence.id.equals(geofenceId)) {
                    geofenceName = namedGeofence.name;
                    break;
                }
            }
            // 3. Set the notification text and send the notification
            String contextText =
                    String.format(this.getResources().getString(R.string.Notification_Text), geofenceName);
            // 1. Create a NotificationManager
            NotificationManager notificationManager =
                    (NotificationManager) this.getSystemService(Context.NOTIFICATION_SERVICE);

            Intent intent = new Intent(this, MapsActivity.class);
            intent.addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP | Intent.FLAG_ACTIVITY_CLEAR_TOP);
            PendingIntent pendingNotificationIntent = PendingIntent.getActivity(this, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);
            AppSettings settings = AppSettings.getSettings(getApplication());
            Notification notification = new NotificationCompat.Builder(this)
                    .setSmallIcon(R.mipmap.ic_launcher)
                    .setContentTitle(this.getResources().getString(R.string.Notification_Title))
                    .setContentText(contextText)
                    .setContentIntent(pendingNotificationIntent)
                    .setStyle(new NotificationCompat.BigTextStyle().bigText(contextText))
                    .setPriority(NotificationCompat.PRIORITY_HIGH)
                    .setAutoCancel(true)
                    .setVibrate(new long[0])
                    .setWhen(System.currentTimeMillis())
                    .build();

            try {
                Uri song = Uri.parse(settings.getSdcard());
                if (song == null) {
                    notification.sound = Uri.parse(ContentResolver.SCHEME_ANDROID_RESOURCE
                            + "://" + getPackageName() + "/raw/battlefield");
                } else {
                    notification.sound = Uri.parse(settings.getSdcard());
                }
            } catch (NullPointerException e) {
                e.printStackTrace();
            }
            notificationManager.notify(0, notification);
        }
    }

    private void onError(int i) {
        Log.e(TAG, "Geofencing Error: " + i);
    }
}

或者您可以使用此示例应用程序代码：link