在Android中,如何连续接收GPS位置?

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【中文标题】在Android中,如何连续接收GPS位置?【英文标题】:In Android ,how to receive GPS location continuously? 【发布时间】:2018-02-17 00:00:48 【问题描述】:

android.location.LocationListener 的位置监听器 onLocationChanged() 函数中的问题。

在下面的代码中请求 LocationManager 的 requestLocationUpdates 后,onLocationChanged 以不均匀的间隔被调用,即我将周期设置为 1 秒,但每秒后我没有收到位置更改。

import android.content.Context;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.util.Log;

@SuppressWarnings("MissingPermission")
public class SimplePositionProvider extends PositionProvider implements LocationListener 

public SimplePositionProvider(Context context, PositionListener listener) 
super(context, listener);

Log.i("SimplePositionProvider", "start");
if (!type.equals(LocationManager.NETWORK_PROVIDER)) 
type = LocationManager.GPS_PROVIDER;




public void startUpdates() 
Log.i("startUpdates", "start");
try 
Log.i("requestLocationUpdates", "start");
Log.i("TYPE", type);
locationManager.requestLocationUpdates(type, period, 0, this);
 catch (Exception e) 
e.printStackTrace();
Log.e(TAG, "error");



public void stopUpdates() 
Log.i("stopUpdates", "start");
locationManager.removeUpdates(this);


@Override
public void onLocationChanged(Location location) 
Log.i("onLocationChanged", "start");
updateLocation(location);


@Override
public void onStatusChanged(String provider, int status, Bundle extras) 
Log.i("onStatusChanged", "start");


@Override
public void onProviderEnabled(String provider) 
Log.i("onProviderEnabled", "start");


@Override
public void onProviderDisabled(String provider) 
Log.i("onProviderDisabled", "start");



【问题讨论】:

创建定位服务以连续获取位置 【参考方案1】:

根据tutorial,您应该使用FusedLocationProviderClient 来请求位置更新。如果没有记忆,该解决方案会以指定的时间间隔发送更新。您可以通过调用LocationServices.getFusedLocationProviderClient(Context context) 获得FusedLocationProviderClient

您可以在LocationRequest 和setExpirationDuration 中设置请求过期持续时间,然后在每次过期后重新启动更新时使用类似以下代码:

Handler handler = new Handler(Looper.myLooper());
handler.postDelayed(new Runnable() 
    @Override
    public void run() 
      if (expectingLocationUpdates) 
        restartLocationUpdates();
      
    
, EXPIRATION_DURATION);

【讨论】:

【参考方案2】:
public class CustomLocationService extends Service implements LocationListener 


private static final Location TODO = null;
boolean isGPSEnabled = false;
boolean isNetworkEnabled = false;
public boolean canGetLocation = false;

Location location;

double latitude;
double longitude;

private static final long MIN_DISTANCE_CHANGE_FOR_UPDATES = 0;
private static final long MIN_TIME_BW_UPDATES = 10000 * 60 * 1;
private CommonSharedPreference commonSharedPreference = new CommonSharedPreference();

protected LocationManager locationManager;
private long time;
Context context;


@Override
public void onCreate() 
    super.onCreate();
    context = this;

    time = MIN_TIME_BW_UPDATES;
    getLocation();



@Override
public void onStart(Intent intent, int startId) 
    getLocation();


@Override
public void onDestroy() 
    // handler.removeCallbacks(sendUpdatesToUI);
    super.onDestroy();
    Log.v("STOP_SERVICE", "DONE");
    locationManager.removeUpdates(GPSTracker.this);


public Location getLocation() 
    try 
        locationManager = (LocationManager) context.getSystemService(LOCATION_SERVICE);

        isGPSEnabled = locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER);

        isNetworkEnabled = locationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER);

        if (!isGPSEnabled && !isNetworkEnabled) 
            // no network provider is enabled

         else 
            this.canGetLocation = true;
            // First get location from Network Provider
            if (isNetworkEnabled) 
                if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) 
                    return TODO;
                
                locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, MIN_TIME_BW_UPDATES, MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
                if (locationManager != null) 
                    location = locationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
                    if (location != null) 
                        latitude = location.getLatitude();
                        longitude = location.getLongitude();
                    
                
            
            // if GPS Enabled get lat/long using GPS Services
            if (isGPSEnabled) 
                if (location == null) 
                    locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, MIN_TIME_BW_UPDATES, MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
                    if (locationManager != null) 
                        location = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
                        if (location != null) 
                            latitude = location.getLatitude();
                            longitude = location.getLongitude();
                        
                    
                
            
        

     catch (Exception e) 
        e.printStackTrace();
    

    return location;



public void stopUsingGPS() 
    if(locationManager != null) 
        locationManager.removeUpdates(GPSTracker.this);
    


public double getLatitude() 
    if(location != null) 
        latitude = location.getLatitude();
    
    return latitude;


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

    return longitude;


public boolean canGetLocation() 
    return this.canGetLocation;



@Override
public void onLocationChanged(Location arg0) 
    // TODO Auto-generated method stub


@Override
public void onProviderDisabled(String arg0) 
    // TODO Auto-generated method stub



@Override
public void onProviderEnabled(String arg0) 
    // TODO Auto-generated method stub



@Override
public void onStatusChanged(String arg0, int arg1, Bundle arg2) 
    // TODO Auto-generated method stub



@Override
public IBinder onBind(Intent intent) 
    // TODO Auto-generated method stub
    return null;

【讨论】:

您好,首先感谢您的代码,但我的问题不是没有收到位置,而是始终没有得到它们!您正在使用 locationManager 的最后一个已知位置,我们被要求不要使用,我们希望以 30 秒为间隔获取当前位置 一旦服务成为明星,onLocationChanged 将在给定的时间间隔内为您提供当前位置【参考方案3】:

According to the documentation,您使用的period 参数是位置更新之间的最小间隔。如果您想在定位系统更新时尽快获取位置,请将period 设置为零。

【讨论】:

谢谢,但我们面临的问题是,位置接收不稳定,一段时间后断开连接。在模拟器中连续接收位置没有问题。 @BonnySebastian 您应该重新提出您的问题。这似乎不是它要问的。【参考方案4】:

使用这个类..

    public class MyLocationService extends Service 
    private static final String TAG = "MyLocationService";
    private LocationManager mLocationManager = null;
    private static final int LOCATION_INTERVAL = 1000 * 30;;
    private static final float LOCATION_DISTANCE = 0f;


    private final IBinder serviceBinder = new MyLocationService.RunServiceBinder();

    public MyLocationService() 
    

    LocationListener[] mLocationListeners = new LocationListener[]
            new LocationListener(LocationManager.GPS_PROVIDER),

    ;

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) 
        Log.e(TAG, "onStartCommand");
        super.onStartCommand(intent, flags, startId);
        return START_STICKY;
    

    @Override
    public void onCreate() 

        Log.e(TAG, "onCreate");

        initializeLocationManager();

     /*   try 
            mLocationManager.requestLocationUpdates(
                    LocationManager.NETWORK_PROVIDER, LOCATION_INTERVAL, LOCATION_DISTANCE,
                    mLocationListeners[1]);
         catch (java.lang.SecurityException ex) 
            Log.i(TAG, "fail to request location update, ignore", ex);
         catch (IllegalArgumentException ex) 
            Log.d(TAG, "network provider does not exist, " + ex.getMessage());
        */



        try 
            mLocationManager.requestLocationUpdates(
                    LocationManager.GPS_PROVIDER, LOCATION_INTERVAL, LOCATION_DISTANCE,
                    mLocationListeners[0]);
         catch (java.lang.SecurityException ex) 
            Log.i(TAG, "fail to request location update, ignore", ex);
         catch (IllegalArgumentException ex) 
            Log.d(TAG, "gps provider does not exist " + ex.getMessage());
        
    

    @Override
    public void onDestroy() 
        Log.e(TAG, "onDestroy");
        super.onDestroy();
        if (mLocationManager != null) 
            for (int i = 0; i < mLocationListeners.length; i++) 
                try 
                    if (ActivityCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) 
                        return;
                    
                    mLocationManager.removeUpdates(mLocationListeners[i]);
                 catch (Exception ex) 
                    Log.i(TAG, "fail to remove location listener, ignore", ex);
                
            
        
    

    private void removeUpdate()
        if (mLocationManager != null) 
            for (int i = 0; i < mLocationListeners.length; i++) 
                try 
                    if (ActivityCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) 
                        return;
                    
                    mLocationManager.removeUpdates(mLocationListeners[i]);
                 catch (Exception ex) 
                    Log.i(TAG, "fail to remove location listener, ignore", ex);
                
            
        
    

    private void initializeLocationManager() 
        Log.e(TAG, "initializeLocationManager - LOCATION_INTERVAL: " + LOCATION_INTERVAL + " LOCATION_DISTANCE: " + LOCATION_DISTANCE);
        if (mLocationManager == null) 
            mLocationManager = (LocationManager) getApplicationContext().getSystemService(Context.LOCATION_SERVICE);
        
    

    @Override
    public IBinder onBind(Intent intent) 
        // TODO: Return the communication channel to the service.
        //   throw new UnsupportedOperationException("Not yet implemented");
        return null;
    

    public class RunServiceBinder extends Binder 
        public MyLocationService getService() 
            return MyLocationService.this;
        
    


    private class LocationListener implements android.location.LocationListener 
        Location mLastLocation;

        public LocationListener(String provider) 
            Log.e(TAG, "LocationListener " + provider);
          //  Toast.makeText(MyLocationService.this, ""+provider, Toast.LENGTH_SHORT).show();
            mLastLocation = new Location(provider);
        

        @Override
        public void onLocationChanged(Location location) 
            Log.e(TAG, "onLocationChanged: " + location);
           // Toast.makeText(MyLocationService.this, ""+"checked", Toast.LENGTH_SHORT).show();
            mLastLocation.set(location);

        

        @Override
        public void onProviderDisabled(String provider) 
            Log.e(TAG, "onProviderDisabled: " + provider);
        

        @Override
        public void onProviderEnabled(String provider) 
            Log.e(TAG, "onProviderEnabled: " + provider);
        

        @Override
        public void onStatusChanged(String provider, int status, Bundle extras) 
            Log.e(TAG, "onStatusChanged: " + provider);
        
    



【讨论】:

放置在我的玻璃桌子上时启动和停止需要时间(与我上面的代码相同)

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