Question

我想知道当他在特定位置附近时是否有任何方式通知用户当用户靠近该位置时，通知会发送到他的电话，提醒他他的位置。

我正在尝试使用以下代码，但它无效。

public class NotifyuserActivity extends Activity { LocationManager locMan; double lat; double lon; NotificationManager notMan;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    locMan=(LocationManager) getSystemService(LOCATION_SERVICE);
    locMan.requestLocationUpdates(LocationManager.GPS_PROVIDER,1000,10, mylistener);
}

LocationListener mylistener = new LocationListener（）{

    @Override
    public void onStatusChanged(String provider, int status, Bundle extras) {
        // TODO Auto-generated method stub

    }

    @Override
    public void onProviderEnabled(String provider) {
        // TODO Auto-generated method stub

    }

    @Override
    public void onProviderDisabled(String provider) {
        // TODO Auto-generated method stub

    }

    @Override
    public void onLocationChanged(Location location) {
        // TODO Auto-generated method stub
        lat = location.getLatitude();
        lon = location.getLongitude();
        CharSequence from = "AlarmManager - Time's up!";
        CharSequence message = "This is your alert";        
        Location tasklocation=new Location(LocationManager.GPS_PROVIDER);
        double dis1 = location.distanceTo(tasklocation);
        tasklocation.setLatitude(22.727733);
        tasklocation.setLongitude(75.886079);
        if(dis1 < 200.00)
        {

            notMan = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
            Notification n = new Notification(R.drawable.ic_launcher, "Click here for details", System.currentTimeMillis());

            Intent notificationIntent = new Intent(NotifyuserActivity.this,NotifyuserActivity.class);
            PendingIntent pendingIntent = PendingIntent.getActivity(NotifyuserActivity.this, 0, notificationIntent, 0);

         n.setLatestEventInfo(NotifyuserActivity.this, from,message, pendingIntent);
           notMan.notify(10001, n);
           Toast.makeText(NotifyuserActivity.this,"Distance to location is: " + dis1, Toast.LENGTH_LONG).show();
        }
    }
};

}

Answer 1

答案是肯定的。

您可以使用一些时间或距离间隔设置注册LocationListener到LocationManager，然后在更改位置时，可以将其与您设置的内容进行比较，以决定是否通知用户。

GPS消耗大量电池电量，因此您最好首先使用网络位置提供商，然后当它离该位置不远时，启动GPS。

正如评论所说，你应该先行动

tasklocation.setLatitude(22.727733);
tasklocation.setLongitude(75.886079);

上面

double dis1 = location.distanceTo(tasklocation);

（更好的是，您可以将这些位置设置移出onLocationChanged()而不是硬编码纬度/经度。）

这可能无法解决您的问题，但不执行此操作永远不会解决问题。所以不要留下这样的错误。

然后，我应该说这段代码对我有用（在我的模拟器中），我看不出你给出的其他错误可能会让你“不工作”。

您可以查看

的权限

<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />

或者可以显示Toast结果或Logcat输出。

毕竟，有关“不工作”的详细信息。

Answer 2

检查这些链接以获取更多详细信息：

LocationListener

Obtaining User Location

Answer 3

此处位置更改代码..尝试此。

@Override
public void onLocationChanged(Location location) {
    // TODO Auto-generated method stub
    if (location != null) {
        System.out.println("in onlocationchanged");
         String locationString=location.convert(location.getLatitude(),1);
         Toast.makeText(this,"locationString=="+locationString, Toast.LENGTH_LONG).show();
        double lat = location.getLatitude();
        double lng = location.getLongitude();
        String currentLocation = "The location is changed to Lat: " + lat + " Lng: " + lng;
        Toast.makeText(this,currentLocation, Toast.LENGTH_LONG).show();
        p = new GeoPoint((int) lat * 1000000, (int) lng * 1000000);


        // check in database if we have same lattitude & longitude

        MySQLiteHelper m=new MySQLiteHelper(getBaseContext());
        Log.d("Reading: ", "Reading all contacts..");
        List<LocWiseProfileBeans> LocWiseProfile= m.getAllLocWiseProfile();       


        for (LocWiseProfileBeans cn : LocWiseProfile) {
            String log = "Loc Name: "+cn.getLocname()+" ,Lattitude: " + cn.getLattitude()+ " ,Longitude: " + cn.getLongitude()+ " , Selected Profile :"+cn.getSelectedprofile();
                // Writing Contacts to log
            double distance2=00.00;

      GeoPoint storedLocation=new GeoPoint(
      (int) cn.getLattitude() * 1000000,(int) cn.getLongitude() * 1000000);    

        Location locationB = new Location("point B");  

        locationB.setLatitude((int) cn.getLattitude() * 1000000);  
        locationB.setLongitude((int) cn.getLongitude() * 1000000);  


        distance2=distFrom(lat,lng,cn.getLattitude(),cn.getLongitude());


        if(distance2>1 )
        {
            Log.d("Name: ", log);
            Toast.makeText(this, "Loc Name:"+log, Toast.LENGTH_SHORT).show();
            Toast.makeText(this,"identical", Toast.LENGTH_LONG).show();
            Toast.makeText(this,"distance2======"+distance2, Toast.LENGTH_SHORT).show();
sendnotification("Locale Notifications","You visited location " + cn.getLocname());


        }

此代码用于通知用户。

protected void sendnotification (String title, String message) {
       String ns = Context.NOTIFICATION_SERVICE;
       NotificationManager mNotificationManager = (NotificationManager) getSystemService(ns);

       int icon = R.drawable.icon;
       CharSequence tickerText = message;
       long when = System.currentTimeMillis();

       Notification notification = new Notification(icon, tickerText, when);

       Context context = getApplicationContext();
       CharSequence contentTitle = title;
       CharSequence contentText = message;
       Intent notificationIntent = new Intent(this, GoogleMapsActivity.class);
       PendingIntent contentIntent = PendingIntent.getActivity(this, 0, notificationIntent, 0);

       notification.flags = Notification.FLAG_AUTO_CANCEL;
       notification.setLatestEventInfo(context, contentTitle, contentText, contentIntent);
       mNotificationManager.notify(1, notification);
    }

这是将经度和纬度转换为英里的功能。

public static double distFrom(double lat1, double lng1, double lat2, double lng2) { 
      double earthRadius = 3958.75; 
      double dLat = Math.toRadians(lat2-lat1); 
      double dLng = Math.toRadians(lng2-lng1); 
      double a = Math.sin(dLat/2) * Math.sin(dLat/2) + 
               Math.cos(Math.toRadians(lat1)) * Math.cos(Math.toRadians(lat2)) * 
               Math.sin(dLng/2) * Math.sin(dLng/2); 
      double c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1-a)); 
      double dist = earthRadius * c; 

      return dist; 
    }

根据您的代码，您需要根据需要进行更改....

通知附近的位置

3 个答案: