Question

我正在使用AddProximityAlert方法处理Android项目，因为您已经知道此方法可让您为位置（纬度，经度）和给定位置设置接近警报半径，如果你离它太近就通知你。

所以我三天前正在研究这个问题，我一次又一次地遇到同样的问题......

in bref：这是我的简单代码。

＃MainActivity.java

package com.example.proximityalert;

import android.app.Activity;
import android.app.PendingIntent;
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.util.Log;

public class MainActivity extends Activity implements LocationListener {

    LocationManager lm;

    //Defining Latitude & Longitude
    double lat=37.422006 ,long1=-122.084095;
    //Defining Radius
    float radius=1000;               

    //Intent Action 
    String ACTION_FILTER = "com.example.proximityalert";


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

       //i'm registering my Receiver First
       registerReceiver(new ProximityReciever(), new IntentFilter(ACTION_FILTER));

       //i'm calling ther service Location Manager
       lm=(LocationManager) getSystemService(LOCATION_SERVICE);

       //for debugging...
       lm.requestLocationUpdates(LocationManager.GPS_PROVIDER, 1000, 10, this);

       //Setting up My Broadcast Intent
       Intent i= new Intent(ACTION_FILTER);
       PendingIntent pi = PendingIntent.getBroadcast(getApplicationContext(), -1, i, 0);

       //setting up proximituMethod
       lm.addProximityAlert(lat, long1, radius, -1, pi);

   }

@Override
//just For debugging to See the distance between my actual position and the aproximit point  
public void onLocationChanged(Location newLocation) {

    Location old = new Location("OLD");
    old.setLatitude(lat);
    old.setLongitude(long1);

    double distance = newLocation.distanceTo(old);

    Log.i("MyTag", "Distance: " + distance);
}

@Override
public void onProviderDisabled(String arg0) {}

@Override
public void onProviderEnabled(String arg0) {}

@Override
public void onStatusChanged(String arg0, int arg1, Bundle arg2) {}

}

＃ProximityReceiver.java

package com.example.proximityalert;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.location.LocationManager;
import android.util.Log;
import android.widget.Toast;


public class ProximityReciever extends BroadcastReceiver {

     @Override
     public void onReceive(Context context, Intent intent) {

         // Key for determining whether user is leaving or entering 
         String key = LocationManager.KEY_PROXIMITY_ENTERING;

         //Gives whether the user is entering or leaving in boolean form  
         boolean state = intent.getBooleanExtra(key, false);

          if(state){
                // Call the Notification Service or anything else that you would like to do here
                Log.i("MyTag", "Welcome to my Area");
                Toast.makeText(context, "Welcome to my Area", Toast.LENGTH_SHORT).show();
          }else{
              //Other custom Notification 
                Log.i("MyTag", "Thank you for visiting my Area,come back again !!");
                Toast.makeText(context, "Thank you for visiting my Area,come back again !!", Toast.LENGTH_SHORT).show();
          }
     }
}

*＃问题是当我运行程序时，即使我非常靠近proximit点，BroadcastReceiver（ProximityReciever）永远不会被系统调用，即使调试器显示我之间的距离两个位置是＆lt; 1000m：/

Answer 1

我刚刚想出了关于这个话题的一些事情，以及为什么addProximityAlert不能正常工作，我和你分享这个，因为我注意到有些人之前问了同样的问题而他们没有得到任何答案！

答案就在我面前，但我没有注意它，所以当我阅读Android官方文档（here）时，我看到这句话“ 由于位置估计的近似性质，如果设备短暂地通过给定区域，则可能不会触发任何意图 “

那是什么意思？这意味着当你在AVD上测试你的应用程序并且你从DDMS向AVD发送gps坐标（纬度，经度）时真的很难模拟一个gps的真实方面，（因为首先你选择一些点作为你的proximPoint，然后你选择远离proximPoint的anthor点来看它是否有效）这不是它真正的用途设备

因此解决方案是在真实设备上测试您的应用程序，或者使用DDMS尝试非常缓慢地更改坐标，直到您进入所需的区域。

Android：addProximityAlert LocationManager方法不发送广播

in bref：这是我的简单代码。

＃MainActivity.java

＃ProximityReceiver.java

1 个答案: