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Java Android:addProximityAlert LocationManager方法不';不要发送广播_Java_Android_Locationmanager_Proximitysensor - Fatal编程技术网

Java Android:addProximityAlert LocationManager方法不';不要发送广播

Java Android:addProximityAlert LocationManager方法不';不要发送广播,java,android,locationmanager,proximitysensor,Java,Android,Locationmanager,Proximitysensor,我正在一个Android项目中工作,我使用AddProximityAlert方法,因为您已经知道,该方法允许您为位置(纬度、经度)和给定半径给定的位置设置接近警报,并通知您是否离它如此近 三天前我一直在研究这个问题,我一次又一次地遇到同样的问题 这是我的简单代码。 #MainActivity.java #ProximityReceiver.java *#问题是当我运行程序时,系统从未调用过BroadcastReceiver(ProximityReciever),即使我非常接近proximit

我正在一个Android项目中工作,我使用AddProximityAlert方法,因为您已经知道,该方法允许您为位置(纬度、经度)和给定半径给定的位置设置接近警报,并通知您是否离它如此近

三天前我一直在研究这个问题,我一次又一次地遇到同样的问题

这是我的简单代码。 #MainActivity.java
#ProximityReceiver.java

*#问题是当我运行程序时,系统从未调用过BroadcastReceiver(ProximityReciever),即使我非常接近proximit点,即使调试器告诉我两个位置之间的距离<1000m:///p>我刚刚弄明白了关于这个主题的一些事情,以及为什么addProximityAlert sames不起作用,我也要与您分享这一点,因为我注意到有些人以前问过同样的问题,他们没有得到任何答案

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

这是什么意思?这意味着当你在AVD上测试你的应用程序时,你从DDMS向AVD发送一个gps坐标(纬度、经度),这真的很难做到 模拟gps的真实情况(因为首先你选择一个点作为你的近景点,然后你选择一个离近景点很远的点,看它是否工作),而这不是真实设备的情况

因此,解决方案是在真正的设备上测试你的应用程序,或者使用DDM尝试非常缓慢地更改坐标,直到你进入想要的区域

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) {}

}
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();
          }
     }
}