在 android 中获取位置无法在较新的设备上运行

Posted 2023-02-23

【中文标题】在 android 中获取位置无法在较新的设备上运行

【英文标题】：Getting location in android not working on newer device

【发布时间】：2014-10-31 06:10:13

【问题描述】：

我正在尝试在我的项目中找到当前位置。所以我找到了这篇文章：

What is the simplest and most robust way to get the user's current location on android?

我尝试使用locationclient但对结果不满意。我使用的代码如下：

Mylocation.java 类：

package com.igloo.classes;

import java.util.Timer;
import java.util.TimerTask;
import android.content.Context;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;

public class MyLocation 
    Timer timer1;
    LocationManager lm;
    LocationResult locationResult;
    boolean gps_enabled=false;
    boolean network_enabled=false;


    public boolean getLocation(Context context, LocationResult result)
    
        //I use LocationResult callback class to pass location value from MyLocation to user code.
        locationResult=result;
        if(lm==null)
            lm = (LocationManager) context.getSystemService(Context.LOCATION_SERVICE);

        //exceptions will be thrown if provider is not permitted.
        trygps_enabled=lm.isProviderEnabled(LocationManager.GPS_PROVIDER);catch(Exception ex)
        trynetwork_enabled=lm.isProviderEnabled(LocationManager.NETWORK_PROVIDER);catch(Exception ex)

        //don't start listeners if no provider is enabled
        if(!gps_enabled && !network_enabled)
            return false;

        if(gps_enabled)
            lm.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, locationListenerGps);
        if(network_enabled)
            lm.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0, locationListenerNetwork);
        timer1=new Timer();
        timer1.schedule(new GetLastLocation(), 90000);
        return true;
    

    LocationListener locationListenerGps = new LocationListener() 
        public void onLocationChanged(Location location) 
            timer1.cancel();
            locationResult.gotLocation(location);
            lm.removeUpdates(this);
            lm.removeUpdates(locationListenerNetwork);
        
        public void onProviderDisabled(String provider) 
        public void onProviderEnabled(String provider) 
        public void onStatusChanged(String provider, int status, Bundle extras) 
    ;

    LocationListener locationListenerNetwork = new LocationListener() 
        public void onLocationChanged(Location location) 
            timer1.cancel();
            locationResult.gotLocation(location);
            lm.removeUpdates(this);
            lm.removeUpdates(locationListenerGps);
        
        public void onProviderDisabled(String provider) 
        public void onProviderEnabled(String provider) 
        public void onStatusChanged(String provider, int status, Bundle extras) 
    ;

    class GetLastLocation extends TimerTask 
        @Override
        public void run() 
             lm.removeUpdates(locationListenerGps);
             lm.removeUpdates(locationListenerNetwork);

             Location net_loc=null, gps_loc=null;
             if(gps_enabled)
                 gps_loc=lm.getLastKnownLocation(LocationManager.GPS_PROVIDER);
             if(network_enabled)
                 net_loc=lm.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);

             //if there are both values use the latest one
             if(gps_loc!=null && net_loc!=null)
                 if(gps_loc.getTime()>net_loc.getTime())
                     locationResult.gotLocation(gps_loc);
                 else
                     locationResult.gotLocation(net_loc);
                 return;
             

             if(gps_loc!=null)
                 locationResult.gotLocation(gps_loc);
                 return;
             
             if(net_loc!=null)
                 locationResult.gotLocation(net_loc);
                 return;
             
             locationResult.gotLocation(null);
        
    
    public void cancelTimer()
    
        if(timer1!=null)
        
         timer1.cancel();
         lm.removeUpdates(locationListenerGps);
         lm.removeUpdates(locationListenerNetwork);
        
    


    public static abstract class LocationResult
        public abstract void gotLocation(Location location);
    

我的主类中的代码：我使用了回调方法来获取位置对象。

locationResult = new LocationResult()
            @Override
            public void gotLocation(Location location)
                if(location!=null)
                
                current_latitude=location.getLatitude();
                current_longitude=location.getLongitude();
                
                if(location!=null&&!isLocationRecieved)
                
                    MarinaJobKeys.user_viewing_jobs=true;
                    isLocationRecieved=true;

                    Handler handler = new Handler(Looper.getMainLooper());
                    handler.post(new Runnable()

                        @Override
                        public void run() 
                            setcurrentlocation();

                         

                    );


                
                else if(location==null)
                
                    Toast.makeText(getActivity(),"NULL LOCATION RETURNED",Toast.LENGTH_LONG).show();
                

            

        ;





 myLocation = new MyLocation();
            myLocation.getLocation(getActivity(), locationResult);

问题是这样的：

代码在旧设备上运行良好。但是当我在新设备上运行时，Mylocation 类中的 onLocationchanged 方法永远不会被调用。但在旧设备中它会立即被调用。我该如何解决这个问题？

编辑：问题在重新启动设备时得到解决。但是为什么会发生呢？

【问题讨论】：

旧设备和新设备是什么意思

旧设备是指我的手机 android 2.6。新设备是指 android 4.0+。问题是当我在新设备上调试时，onlocationchanged 永远不会被调用。

您遇到任何错误？

@Amy.No error。问题是新设备永远不会调用 onlocationchanged 方法。

locationmanager.requestForLocation is not working in motorola backflip & samsung galaxy的可能重复

【参考方案1】：

您必须从设置中启用位置。

请查看this link。

go to setting --> Location Access --> turn on Location.

【讨论】：

两个提供者都打开了。我在代码中将它们作为布尔变量进行检查，并且都返回 true。