在 Android 中使用 GPS 获取当前位置

Posted 2023-04-14

【中文标题】在 Android 中使用 GPS 获取当前位置

【英文标题】：Get current location using GPS in Android

【发布时间】：2014-05-09 14:45:31

【问题描述】：

我现在正在一个项目中工作，我想使用 gps 获取用户的当前位置。我已经阅读了很多教程并尝试编写代码。该代码在模拟器中运行良好。每次我使用 DDMS 发送纬度和经度时，模拟器都会检测到。主要问题是它不适用于真实设备。虽然，我尝试过的设备可以访问互联网并且 GPS 是打开的。我已在清单文件中添加了所需的权限。

public class MainActivity extends Activity 

TextView lat;
TextView lon;
@Override
protected void onCreate(Bundle savedInstanceState) 
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    lat=(TextView)findViewById(R.id.textView2);
    lon=(TextView)findViewById(R.id.textView4);
    LocationManager lm=(LocationManager)getSystemService(Context.LOCATION_SERVICE);
    LocationListener ll=new myLocationListener();
    lm.requestLocationUpdates(LocationManager.GPS_PROVIDER,0,0, ll);


@Override
public boolean onCreateOptionsMenu(Menu menu) 
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.main, menu);
    return true;

   class myLocationListener implements LocationListener

@Override
public void onLocationChanged(Location location) 
    // TODO Auto-generated method stub
    if(location!=null)
        double pLat=location.getLatitude();
        double pLong=location.getLongitude();
        lat.setText(Double.toString(pLat));
        lon.setText(Double.toString(pLong));
    


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



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



@Override
public void onStatusChanged(String provider, int status, Bundle extras) 
    // TODO Auto-generated method stub



 

清单文件中的权限

<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>
<uses-permission android:name="android.permission.INTERNET"/>

我需要帮助。

【问题讨论】：

您可以将此库用于更简单的位置 API：github.com/delight-im/Android-SimpleLocation

@Marco W github.com/delight-im/Android-SimpleLocation 无法正常工作，它总是返回 0.0 纬度和经度。

@TejaDroid 这两个支持问题应该对您有所帮助：github.com/delight-im/Android-SimpleLocation/issues/3 和 github.com/delight-im/Android-SimpleLocation/issues/4

【参考方案1】：

GPSTracker gps = new GPSTracker(this);
double latitude = gps.getLatitude();
double longitude = gps.getLongitude();

使用此 GPS 服务：

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;
import android.util.Log;

public class GPSTracker extends Service implements LocationListener 

    private final Context mContext;

    // flag for GPS status
    boolean isGPSEnabled = false;

    // flag for network status
    boolean isNetworkEnabled = false;

    // flag for GPS status
    boolean canGetLocation = false;

    Location location; // location
    double latitude; // latitude
    double longitude; // longitude

    // The minimum distance to change Updates in meters
    private static final long MIN_DISTANCE_CHANGE_FOR_UPDATES = 10; // 10 meters

    // The minimum time between updates in milliseconds
    private static final long MIN_TIME_BW_UPDATES = 1000 * 60 * 1; // 1 minute

    // Declaring a Location Manager
    protected LocationManager locationManager;

    public GPSTracker(Context context) 
        this.mContext = context;
        getLocation();
    

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

            // getting GPS status
            isGPSEnabled = locationManager
                    .isProviderEnabled(LocationManager.GPS_PROVIDER);

            // getting network status
            isNetworkEnabled = locationManager
                    .isProviderEnabled(LocationManager.NETWORK_PROVIDER);


            if (!isGPSEnabled && !isNetworkEnabled) 
                // no network provider is enabled
             else 
                this.canGetLocation = true;
                if (isNetworkEnabled) 
                    locationManager.requestLocationUpdates(
                            LocationManager.NETWORK_PROVIDER,
                            MIN_TIME_BW_UPDATES,
                            MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
                    Log.d("Network", "Network");
                    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);
                        Log.d("GPS Enabled", "GPS Enabled");
                        if (locationManager != null) 
                            location = locationManager
                                    .getLastKnownLocation(LocationManager.GPS_PROVIDER);
                            if (location != null) 
                                latitude = location.getLatitude();
                                longitude = location.getLongitude();
                            
                        
                    
                
            

         catch (Exception e) 
        
        return location;
    

    /**
     * Stop using GPS listener Calling this function will stop using GPS in your
     * app.
     * */
    public void stopUsingGPS() 
        if (locationManager != null) 
            locationManager.removeUpdates(GPSTracker.this);
        
    

    /**
     * Function to get latitude
     * */
    public double getLatitude() 
        if (location != null) 
            latitude = location.getLatitude();
        
        // return latitude
        return latitude;
    

    /**
     * Function to get longitude
     * */
    public double getLongitude() 
        if (location != null) 
            longitude = location.getLongitude();
        

        // return longitude
        return longitude;
    

    /**
     * Function to check GPS/wifi enabled
     * 
     * @return boolean
     * */
    public boolean canGetLocation() 
        return this.canGetLocation;
    

    /**
     * Function to show settings alert dialog On pressing Settings button will
     * lauch Settings Options
     * */
    public void showSettingsAlert() 
        AlertDialog.Builder alertDialog = new AlertDialog.Builder(mContext);

        // Setting DialogHelp Title
        alertDialog.setTitle("GPS is settings");

        // Setting DialogHelp Message
        alertDialog
                .setMessage("GPS is not enabled. Do you want to go to settings menu?");

        // On pressing Settings button
        alertDialog.setPositiveButton("Settings",
                new DialogInterface.OnClickListener() 
                    public void onClick(DialogInterface dialog, int which) 
                        Intent intent = new Intent(
                                Settings.ACTION_LOCATION_SOURCE_SETTINGS);
                        mContext.startActivity(intent);
                    
                );

        // on pressing cancel button
        alertDialog.setNegativeButton("Cancel",
                new DialogInterface.OnClickListener() 
                    public void onClick(DialogInterface dialog, int which) 
                        dialog.cancel();
                    
                );

        // Showing Alert Message
        alertDialog.show();
    

    @Override
    public void onLocationChanged(Location location) 
        float bestAccuracy = -1f;
        if (location.getAccuracy() != 0.0f
            && (location.getAccuracy() < bestAccuracy) || bestAccuracy == -1f) 
                locationManager.removeUpdates(this);
        
        bestAccuracy = location.getAccuracy();
    

    @Override
    public void onProviderDisabled(String provider) 
    

    @Override
    public void onProviderEnabled(String provider) 
    

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

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

    public float getAccurecy()
    
        return location.getAccuracy();
    

【讨论】：

好的。谢谢:) ..我在模拟器中试过了，效果很好。我很快就会在真实设备上试用它。感谢您的快速响应

我想在单击按钮后获取位置，因此我将这些拖线放在按钮的侦听器上： GPSTracker gps = new GPSTracker(this);双纬度 = gps.getLatitude();双经度 = gps.getLongitude();对吗？

我在本地设备上试过你的代码。当我打开网络提供商时它运行良好。但是当它关​​闭时，只有 GPS 启用。我得到了 0,0 英尺纬度，经度。请帮助我如何仅使用 GPS 获取位置。

您知道...您应该在答案中列出您从该站点获取的答案 [androidhive.info/2012/07/android-gps-location-manager-tutorial/…。这是抄袭！

【参考方案2】：

试试这样。您应该记住，本地化需要启动 GPS，并且需要一些时间。在该课程中，我会延迟一些时间来触发定位内容以获得结果，因为 GPS 组件应该有时间启动。

public class MyBestLocation 
    LocationListener locationListenerGps = new LocationListener() 
        @Override
        public void onLocationChanged(Location location) 
            locationResult.gotLocation(location);
            lm.removeUpdates(this);
            lm.removeUpdates(locationListenerNetwork);
        

        @Override
        public void onProviderDisabled(String provider) 
        

        @Override
        public void onProviderEnabled(String provider) 
        

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

        @Override
        public void onProviderDisabled(String provider) 
        

        @Override
        public void onProviderEnabled(String provider) 
        

        @Override
        public void onStatusChanged(String provider, int status, Bundle extras) 
        
    ;
    //delay in seconds
    private int DELAY = 1;
    private Timer timer1;
    private LocationManager lm;
    private LocationResult locationResult;
    private boolean gps_enabled = false;
    private boolean network_enabled = false;
    private ScheduledExecutorService scheduler;
    private ScheduledFuture scheduledFuture;

    public boolean getLocation(Context context, LocationResult result) 
        // 
        locationResult = result;
        if (lm == null)
            lm = (LocationManager) context
                    .getSystemService(Context.LOCATION_SERVICE);

        // checking weather providers are aviliable
        try 
            gps_enabled = lm.isProviderEnabled(LocationManager.GPS_PROVIDER);
         catch (Exception ex) 
        
        try 
            network_enabled = lm
                    .isProviderEnabled(LocationManager.NETWORK_PROVIDER);
         catch (Exception ex) 
        

        // 
        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);
        //----------------------
       // async executor method upgrade
        timer1 = new Timer();
        timer1.schedule(new GetLastLocation(), DELAY*2000);
       // ----------------

        // 
       /* scheduler = Executors.newSingleThreadScheduledExecutor();
        scheduler.schedule(new GetLastLocation(), DELAY, TimeUnit.SECONDS);*/
        return true;
    

    // Timer for the latest location

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

    /**
     * 
     *
     * @author rafik991
     */
    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);