安卓如何正确实现接近传感器

Question

我的应用会找到用户的位置。我正在尝试设置邻近警报。该应用程序使用 ZXing 扫描仪扫描二维码。QR码具有我在应用程序中读取的lon/lat值。 我想将用户的当前位置与存储在QR码上的值进行比较，并确定用户是否在给定的容差（半径）内。

从不调用 ProximityIntentReceiver 中的 onReceive 方法。知道为什么吗？谢谢。

import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.graphics.Color;
import android.location.LocationManager;
import android.util.Log;
    public class ProximityIntentReceiver extends BroadcastReceiver {
        private static final String TAG = ProximityIntentReceiver.class.getSimpleName(); 
        private static final int NOTIFICATION_ID = 1000;
        @Override
        public void onReceive(Context context, Intent intent) {
             Log.e(TAG, "inside prox onreceive");
            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;
        }
    }

.

import android.app.PendingIntent;
import android.app.Service;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.os.IBinder;
import android.support.v4.content.LocalBroadcastManager;
import android.util.Log;
public class LocationService extends Service {
    private static final String TAG = LocationService.class.getSimpleName();
    LocationManager             mlocManager;
    LocationListener            mlocListener;
    NfcScannerApplication       nfcscannerapplication;
    private static final String PROX_ALERT_INTENT = "com.carefreegroup.ProximityAlert";
    Intent intent;
    PendingIntent proximityIntent;
    ProximityIntentReceiver pir;
    @Override
    public void onCreate() {
        nfcscannerapplication = (NfcScannerApplication) getApplication();
        mlocManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
        mlocListener = new MyLocationListener();
        pir = new ProximityIntentReceiver();
        intent = new Intent(PROX_ALERT_INTENT);
        proximityIntent = PendingIntent.getBroadcast(this, 0, intent, 0);
        Log.e(TAG, "Service created and location manager and listener created");
        super.onCreate();
    }
    @Override
    public void onDestroy() {
        mlocManager.removeUpdates(mlocListener);
        unregisterReceiver(pir);
        Log.e(TAG, "Service destroyed");
        super.onDestroy();
    }
    @Override
    public void onStart(Intent intent, int startId) {
        mlocManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, mlocListener);
        Log.e(TAG, "requesting location updates");
        super.onStart(intent, startId);
    }
    @Override
    public IBinder onBind(Intent intent) {
        // TODO Auto-generated method stub
        return null;
    }
    private class MyLocationListener implements LocationListener {

        @Override
        public void onLocationChanged(Location loc) {

            Log.e(TAG, "about to set geopoints in application object");
            nfcscannerapplication.setLat(loc.getLatitude());
            nfcscannerapplication.setLon(loc.getLongitude());
            fireLocationChangeEvent(loc.getLongitude(), loc.getLatitude());
            mlocManager.addProximityAlert(53.653480529785156, -1.51961088180542, 2, -1, proximityIntent );
            IntentFilter filter = new IntentFilter(PROX_ALERT_INTENT); 
            registerReceiver(pir, filter);
              sendBroadcast(intent);
        }

Answer 1

请看一下这个存储在服务器中的位置坐标的邻近警报。

问题略有不同，但您需要使用它的方法。

我认为这很简单。