Question

我正在尝试在app中获取位置，并且当我第一次打开GPS时。它显示纬度和经度0,0。但当我再次检查它显示正确。我和你分享我的代码，请帮我找出问题所在。这是我的GPS追踪器代码。我尝试了很多解决方案，但没有得到任何工作。第一次来o是什么原因???

public class LocationTrack extends Service implements LocationListener {

private final Context mContext;


boolean checkGPS = false;


boolean checkNetwork = false;

boolean canGetLocation = false;

Location loc;
double latitude;
double longitude;


private static final long MIN_DISTANCE_CHANGE_FOR_UPDATES = 70;


private static final long MIN_TIME_BW_UPDATES = 1000 * 60 * 1;
protected LocationManager locationManager;

public LocationTrack(Context mContext) {
    this.mContext = mContext;
    getLocation();
}

private Location getLocation() {

    try {
        locationManager = (LocationManager) mContext
                .getSystemService(LOCATION_SERVICE);

        // get GPS status
        checkGPS = locationManager
                .isProviderEnabled(LocationManager.GPS_PROVIDER);

        // get network provider status
        checkNetwork = locationManager
                .isProviderEnabled(LocationManager.NETWORK_PROVIDER);

        if (!checkGPS && !checkNetwork) {
            Toast.makeText(mContext, "No Service Provider is available", Toast.LENGTH_SHORT).show();
        } else {
            this.canGetLocation = true;

            // if GPS Enabled get lat/long using GPS Services
            if (checkGPS) {

                if (ActivityCompat.checkSelfPermission(mContext, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(mContext, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
                    // TODO: Consider calling
                    //    ActivityCompat#requestPermissions
                    // here to request the missing permissions, and then overriding
                      //public void onRequestPermissionsResult(int requestCode, String[] permissions,
                           //                                  int[] grantResults)
                    // to handle the case where the user grants the permission. See the documentation
                    // for ActivityCompat#requestPermissions for more details.
                }
                locationManager.requestLocationUpdates(
                        LocationManager.GPS_PROVIDER,
                        MIN_TIME_BW_UPDATES,
                        MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
                if (locationManager != null) {
                    loc = locationManager
                            .getLastKnownLocation(LocationManager.GPS_PROVIDER);
                    if (loc != null) {
                        latitude = loc.getLatitude();
                        longitude = loc.getLongitude();
                    }
                }


            }


            if (checkNetwork) {


                if (ActivityCompat.checkSelfPermission(mContext, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(mContext, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
                    // TODO: Consider calling
                    //    ActivityCompat#requestPermissions
                    // here to request the missing permissions, and then overriding
                    //   public void onRequestPermissionsResult(int requestCode, String[] permissions,
                    //                                          int[] grantResults)
                    // to handle the case where the user grants the permission. See the documentation
                    // for ActivityCompat#requestPermissions for more details.
                }
                locationManager.requestLocationUpdates(
                        LocationManager.NETWORK_PROVIDER,
                        MIN_TIME_BW_UPDATES,
                        MIN_DISTANCE_CHANGE_FOR_UPDATES, this);

                if (locationManager != null) {
                    loc = locationManager
                            .getLastKnownLocation(LocationManager.NETWORK_PROVIDER);

                }

                if (loc != null) {
                    latitude = loc.getLatitude();
                    longitude = loc.getLongitude();
                }
            }

        }


    } catch (Exception e) {
        e.printStackTrace();
    }

    return loc;
}

public double getLongitude() {
    if (loc != null) {
        longitude = loc.getLongitude();
    }
    return longitude;
}

public double getLatitude() {
    if (loc != null) {
        latitude = loc.getLatitude();
    }
    return latitude;
}

public boolean canGetLocation() {
    return this.canGetLocation;
}

public void showSettingsAlert() {
    AlertDialog.Builder alertDialog = new AlertDialog.Builder(mContext);


    alertDialog.setTitle("GPS is not Enabled!");

    alertDialog.setMessage("Do you want to turn on GPS?");


    alertDialog.setPositiveButton("Yes", new DialogInterface.OnClickListener() {
        public void onClick(DialogInterface dialog, int which) {
            Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
            mContext.startActivity(intent);
        }
    });


    alertDialog.setNegativeButton("No", new DialogInterface.OnClickListener() {
        public void onClick(DialogInterface dialog, int which) {
            dialog.cancel();
        }
    });


    alertDialog.show();
}


public void stopListener() {
    if (locationManager != null) {

        if (ActivityCompat.checkSelfPermission(mContext, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(mContext, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
            // TODO: Consider calling
            //    ActivityCompat#requestPermissions
            // here to request the missing permissions, and then overriding
            //   public void onRequestPermissionsResult(int requestCode, String[] permissions,
            //                                          int[] grantResults)
            // to handle the case where the user grants the permission. See the documentation
            // for ActivityCompat#requestPermissions for more details.
            return;
        }
        locationManager.removeUpdates(LocationTrack.this);
    }
}

@Override
public IBinder onBind(Intent intent) {
    return null;
}

@Override
public void onLocationChanged(Location location) {
    this.loc = location;
    getLatitude();
    getLongitude();

}

@Override
public void onStatusChanged(String s, int i, Bundle bundle) {

}

@Override
public void onProviderEnabled(String s) {

}

@Override
public void onProviderDisabled(String s) {

}

}

具有所有权限的清单文件....

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.user.attendenceapplication">
<uses-feature android:name="android.hardware.location.gps" />

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

<application
    android:allowBackup="true"
    android:icon="@drawable/logodki"
    android:label="@string/app_name"
    android:roundIcon="@mipmap/ic_launcher_round"
    android:supportsRtl="true"
    android:theme="@style/AppTheme">
    <activity android:name=".SplashScreen">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>

Answer 1

许多GPS接收器在进行修复之前查询纬度或经度时将返回0，它与您的代码无关。

看到这个问题： GPS Intermediate Driver Constantly Return 0 0 LAT LNG

使用GPS获取纬度和经度为0,0

1 个答案: