Question

我尝试使用以下代码获取当前位置，但返回了上述设备中的经度和纬度为null或0,0（像素os 8.0，Moto os 7.0，OnePlus 8.0）。在其他具有相同操作系统的设备上，它运行正常。这是我的代码。

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();
                            }

                            if (location == null || location.getAccuracy() < location.getAccuracy()) {
                                // Found best last known location: %s", l);
                                location = location;
                            }
                        }
                    }
                }

获取最后一个已知的定位方法

 private Location getLastKnownLocation() {
        locationManager = (LocationManager)mContext.getSystemService(LOCATION_SERVICE);
        List<String> providers = locationManager.getProviders(true);
        Location bestLocation = null;
        for (String provider : providers) {
            Location l = locationManager.getLastKnownLocation(provider);
            if (l == null) {
                continue;
            }
            if (bestLocation == null || l.getAccuracy() < bestLocation.getAccuracy()) {
                // Found best last known location: %s", l);
                bestLocation = l;
            }
        }
        return bestLocation;
    }

onLocationChanged（位置位置）方法

Geocoder geocoder = new Geocoder(this, Locale.getDefault());
                List<Address> addresses = geocoder.getFromLocation(location.getLatitude(), location.getLongitude(), 1);
                String add=addresses.get(0).getAddressLine(1)+", "+addresses.get(0).getAddressLine(2);

Answer 1

尝试使用Fused Location API，这是一个高级Google Play服务API，其中封装了诸如GPS之类的基础位置传感器。

用法：

在app/build.gradle中添加依赖项

dependencies {
    api 'com.google.android.gms:play-services-location:11.8.0'
}

所需权限：

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

连接到LocationServices API

private LocationRequest mLocationRequest;

private long UPDATE_INTERVAL = 10 * 1000;  /* 10 secs */
private long FASTEST_INTERVAL = 2000; /* 2 sec */

public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    startLocationUpdates(); 
}

// Trigger new location updates at interval
protected void startLocationUpdates() {

    // Create the location request to start receiving updates
    mLocationRequest = new LocationRequest();
    mLocationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
    mLocationRequest.setInterval(UPDATE_INTERVAL);
    mLocationRequest.setFastestInterval(FASTEST_INTERVAL);

    // Create LocationSettingsRequest object using location request
    LocationSettingsRequest.Builder builder = new LocationSettingsRequest.Builder();
    builder.addLocationRequest(mLocationRequest);
    LocationSettingsRequest locationSettingsRequest = builder.build();

    // Check whether location settings are satisfied
    // https://developers.google.com/android/reference/com/google/android/gms/location/SettingsClient
    SettingsClient settingsClient = LocationServices.getSettingsClient(this);
    settingsClient.checkLocationSettings(locationSettingsRequest);

    // new Google API SDK v11 uses getFusedLocationProviderClient(this)
    getFusedLocationProviderClient(this).requestLocationUpdates(mLocationRequest, new LocationCallback() {
      @Override
      public void onLocationResult(LocationResult locationResult) {
         // do work here
         onLocationChanged(locationResult.getLastLocation());
      }
    },
    Looper.myLooper());
}

，然后使用onLocationChanged注册位置更新

public void onLocationChanged(Location location) {
    // New location has now been determined
    String msg = "Updated Location: " +
        Double.toString(location.getLatitude()) + "," +
        Double.toString(location.getLongitude());
    Toast.makeText(this, msg, Toast.LENGTH_SHORT).show();
    // You can now create a LatLng Object for use with maps
    LatLng latLng = new LatLng(location.getLatitude(), location.getLongitude());
}

有关更多信息，请访问guides.codepath.com指南

在某些设备（例如Google Pixel，Moto G4，OnePlus 6）中获取LocationManager和经度-纬度为空

1 个答案: