如何在Android地图中获得连续的位置更新？

Question

我正在建立一个跟踪android应用的朋友。当我的朋友激活应用程序并随着他的GPS和手机数据一起离开时，我需要在我的设备上跟踪他。这就是概念。

我已经实现了LocationListener类，现在我可以从Gps或网络获取最后更新的位置，但除非我启动Google Maps并返回我的应用程序，否则不会更新。在谷歌搜索后，我了解到位置缓存仅由GMaps更新。

是否有另一种方法可以持续更新位置？
如果我需要在没有使用Wakelock的情况下锁定设备后继续定位怎么办？

这是我的位置监听器类：

package com.amazinginside;

/** AMAZING LOCATION SUPPORT CLASS, Devoloped By SANGEETH NANDAKUMAR */

import android.app.AlertDialog;
import android.app.Service;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.os.IBinder;
import android.provider.Settings;

public class AmazingLocation extends Service implements LocationListener

    private final Context mContext;
    boolean isGPSEnabled = false;
    boolean isNetworkEnabled = false;
    boolean canGetLocation = false;

    Location location;
    double latitude=0.0;
    double longitude=0.0;

    //MINIMUM DISTANCE FOR UPDATE (meters)
    private static final long MIN_DISTANCE_CHANGE_FOR_UPDATES = 0; // 0 Meters

    //MINIMUM TIME BETWEEN UPDATES
    private static final long MIN_TIME_BW_UPDATES = 1000 * 0; // 0 Seconds

    //LOCATION MANAGER
    protected LocationManager locationManager;

    //CONSTRUCTOR
    public AmazingLocation(Context context)
    
        this.mContext = context;
        getLocation();
    

    //LOCATION PROVISION
    public Location getLocation()
    
        try
        
            //GET LOCATION MANAGER
            locationManager = (LocationManager) mContext.getSystemService(LOCATION_SERVICE);
            //CHECK GPS STATE
            isGPSEnabled = locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER);
            //CHECK NETWORK STATE
            isNetworkEnabled = locationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER);

            if (!isGPSEnabled && !isNetworkEnabled)
            
                //NO LOCATION PROVIDERS
            
            else
            
                this.canGetLocation = true;

                /** GET LOCATION FROM NETWORK */
                //FIRST GET LOCATION FROM NETWORK
                if (isNetworkEnabled)
                
                    //REQUEST LOCATION
                    locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, MIN_TIME_BW_UPDATES, MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
                    if (locationManager != null)
                    
                        //START WITH LAST KNOWN LOCATION
                        location = locationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
                        //EXTRACT LOCATION
                        if (location != null)
                        
                            latitude = location.getLatitude();
                            longitude = location.getLongitude();
                        
                    
                

                /** GET LOCATION FROM GPS SENSOR */
                //THEN GET LOCATION FROM GPS
                if (isGPSEnabled)
                
                    if (location == null)
                    
                        //REQUEST GPS LOCATION
                        locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, MIN_TIME_BW_UPDATES, MIN_DISTANCE_CHANGE_FOR_UPDATES, this);

                        if (locationManager != null)
                        
                            //EXTRACT LAST KNOWN LOCATION
                            location = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
                            //RETURN LOCATION
                            if (location != null)
                            
                                latitude = location.getLatitude();
                                longitude = location.getLongitude();
                            
                        
                    
                
            

        
        catch (Exception e)
        
            e.printStackTrace();
        

        return location;
    

    //STOP GPS SENSOR
    public void stopUsingGPS()
    
        if(locationManager != null)
        
            locationManager.removeUpdates(AmazingLocation.this);
        
    

    //EXTRACT LATTITUDE
    public double getLatitude()
    
        if(location != null)
        
            latitude = location.getLatitude();
        

        // return latitude
        return latitude;
    

    //EXTACT LONGITUDE
    public double getLongitude()
    
        if(location != null)
        
            longitude = location.getLongitude();
        

        // return longitude
        return longitude;
    

    //CAN I GET THE LOCATION.?
    public AmazingStatus canGetLocation()
    
        AmazingStatus status=new AmazingStatus();
        if(this.canGetLocation)
        
            status.setStatus(true);
            status.setErrorcode(0);
            status.setErrormsg("Task completed");
        
        else
        
            status.setStatus(false);
            status.setErrorcode(145);
            status.setErrormsg("Please turn on GPS access manually");
        
        return status;
    

    //SHOW LOCATION SETTINGS
    public AmazingStatus showSettingsAlert()
    
        final AmazingStatus status=new AmazingStatus();
        AlertDialog.Builder alertDialog = new AlertDialog.Builder(mContext);
        alertDialog.setTitle("REQUIRES LOCATION ACCESS");
        alertDialog.setMessage("Please allow GPS access to this app");

        //POSSITIVE REPLY
        alertDialog.setPositiveButton("Allow", new DialogInterface.OnClickListener()
        
            public void onClick(DialogInterface dialog,int which)
            
                Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
                mContext.startActivity(intent);
                status.setStatus(true);
                status.setErrorcode(0);
                status.setErrormsg("Task completed");
            
        );

        //NEGATIVE REPLY
        alertDialog.setNegativeButton("Deny", new DialogInterface.OnClickListener()
        
            public void onClick(DialogInterface dialog, int which)
            
                status.setStatus(false);
                status.setErrorcode(408);
                status.setErrormsg("User denied permission");
                dialog.cancel();
            
        );

        // Showing Alert Message
        alertDialog.show();
        return status;
    

    //UNUSED OVERRIDE METHORDS...
    @Override
    public void onLocationChanged(Location location)
    
        getLocation();
    

    @Override
    public void onProviderDisabled(String provider)
    
    

    @Override
    public void onProviderEnabled(String provider)
    
        getLocation();
    

    @Override
    public void onStatusChanged(String provider, int status, Bundle extras)
    
        getLocation();
    

    @Override
    public IBinder onBind(Intent arg0)
    
        return null;

这是我的onCreate()方法：

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

    //CREATE A BUTTON HANDLER
    Button start_btn=(Button)findViewById(R.id.start_location_streaming);
    //ON BUTTON CLICK EVENT
    start_btn.setOnClickListener(new View.OnClickListener()
    
        @Override
        public void onClick(View v)
        
            //REPEAT A METHORD AT SPECIFIC INTERVALS
            Timer myTimer = new Timer();
            myTimer.schedule(new TimerTask()
            
                @Override
                public void run()
                
                    TimerMethod();
                

            , 0, 8000);
        
    );

这些是其他方法：

private void TimerMethod()

    //START METHORD
    this.runOnUiThread(Timer_Tick);


//LOCATION REPORTING METHORD
private Runnable Timer_Tick = new Runnable()

    public void run()
    
        Toast.makeText(MainActivity.this, "Current latitude : "+Double.toString(getLocation().latitude), Toast.LENGTH_SHORT).show();
        Toast.makeText(MainActivity.this, "Current longitude : "+Double.toString(getLocation().longitude), Toast.LENGTH_SHORT).show();
    
;

private LatLng getLocation()

    //CREATE A LOCATION CLASS INSTANCE
    AmazingLocation gps = new AmazingLocation(this);
    //RETRIVE LOCATION
    double latitude = gps.getLatitude();
    double longitude = gps.getLongitude();
    //RETURN LOCATION
    LatLng loc=new LatLng(latitude,longitude);
    return loc;

现在的问题是，吐司只是显示以前知道的位置而不是更新，除非我打开谷歌地图并返回。

任何帮助对我来说都很棒。

Answer 1

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Answer 2

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Answer 3

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