Question

在我的6.0 Nexus 7平板电脑上，手机位置为关闭时，

getLastLocation()会返回NULL，但在其他设备上没有GPS可以正常工作。为什么会如此以及任何解决方法？我希望关闭GPS，只需使用网络获取位置。

以下是我用来获取位置的课程：

public class GPSCenter {
public static GoogleApiClient mGoogleApiClient;
public static Location mLastLocation;
private static Context mContext;

static GoogleApiClient.ConnectionCallbacks ccb = new GoogleApiClient.ConnectionCallbacks() {

    @Override
    public void onConnectionSuspended(int arg0) {
    }

    @Override
    public void onConnected(Bundle arg0) {

        if (ActivityCompat.checkSelfPermission(mContext, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
            return;
        }

        LocationRequest mLocationRequest = LocationRequest.create();
        mLocationRequest.setPriority(LocationRequest.PRIORITY_NO_POWER);

        mLastLocation = LocationServices.FusedLocationApi.getLastLocation(mGoogleApiClient);
    }
};
static GoogleApiClient.OnConnectionFailedListener odfl = new GoogleApiClient.OnConnectionFailedListener() {
    @Override
    public void onConnectionFailed(ConnectionResult arg0) {
    }
};

public static synchronized void buildGoogleApiClient(Context c) {
    try {

        mContext = c;
        mGoogleApiClient = new GoogleApiClient.Builder(c)
                .addConnectionCallbacks(ccb)
                .addOnConnectionFailedListener(odfl)
                .addApi(LocationServices.API)
                .build();

        mGoogleApiClient.connect();
    } catch (Exception ex) {
        Log.i("location", "error " + ex.toString());
        ex.printStackTrace();
    }
}

public static double getLatitude(Context c) {
    try {
        return mLastLocation.getLatitude();
    } catch (Exception ex) {
        return 0.0;
    }
}

public static double getLongitude(Context c) {
    try {
        return mLastLocation.getLongitude();
    } catch (Exception ex) {
        return 0.0;
    }
}
}

Answer 1

这不是因为GPS的问题，但设备中尚未启用Location Settings，它位于您的设备设置＆gt; Google＆gt;服务＆gt;位置，或设置＆gt;隐私和安全＆gt;位置，或只是设置＆gt;位置。我感到困惑，因为在某些设备中，下拉状态栏显示GPS启用按钮，一些显示位置启用按钮。有一种方法可以自动启用位置设置（无需导航用户到设备设置），它解决了我的问题，希望它可以帮助您：

连接GoogleApiClient后，执行位置设置检查，如下所示：

public static GoogleApiClient mGoogleApiClient;
private static PendingResult<LocationSettingsResult> result;
private static LocationSettingsRequest.Builder builder;
public static Location mLastLocation;
public static boolean isLocationON = false;

public static synchronized void buildGoogleApiClient(Activity a, Context c) {

    try {

        mActivity = a;
        mContext = c;
        mGoogleApiClient = new GoogleApiClient.Builder(c)
                .addConnectionCallbacks(ccb)
                .addOnConnectionFailedListener(odfl)
                .addApi(LocationServices.API)
                .build();

        builder = new LocationSettingsRequest.Builder()
                .addLocationRequest(locationRequest);
        builder.setAlwaysShow(true);

        mGoogleApiClient.connect();

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

private static GoogleApiClient.ConnectionCallbacks ccb = new GoogleApiClient.ConnectionCallbacks() {

    @Override
    public void onConnected(Bundle arg0) {
        checkLocationSettings();
    }

    @Override
    public void onConnectionSuspended(int arg0) {
    }
};

private static void checkLocationSettings() {

    result = LocationServices.SettingsApi.checkLocationSettings(mGoogleApiClient, builder.build());

    result.setResultCallback(new ResultCallback<LocationSettingsResult>() {

        @Override
        public void onResult(@NonNull LocationSettingsResult locationSettingsResult) {
            final Status status = locationSettingsResult.getStatus();
            switch (status.getStatusCode()) {
                case LocationSettingsStatusCodes.SUCCESS:

                    isLocationON = true;

                    if (ActivityCompat.checkSelfPermission(mContext, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
                        return;
                    }
                    mLastLocation = LocationServices.FusedLocationApi.getLastLocation(mGoogleApiClient);

                    if (mLocationSettingsListener != null) {
                        mLocationSettingsListener.onLocationON();
                    }

                    break;

                case LocationSettingsStatusCodes.RESOLUTION_REQUIRED:

                    isLocationON = false;

                    try {
                        // This line will check the result and prompt a dialog if the device location settings is not enabled
                        status.startResolutionForResult(mActivity, REQUEST_CHECK_SETTINGS);

                    } catch (IntentSender.SendIntentException e) {
                    }
                    break;

                case LocationSettingsStatusCodes.SETTINGS_CHANGE_UNAVAILABLE:
                    isLocationON = false;
                    // Location settings are unavailable so not possible to show any dialog now
                    if (mLocationSettingsListener != null) {
                        mLocationSettingsListener.onLocationError();
                    }
                    break;
            }
        }
    });
}

Answer 2

通过谷歌Api，我认为这是不可能的。为此你需要使用一些api进行ip地理定位，或者你可以通过这个使用MNC-Mobile网络位置或MCC-Mobile国家代码。它可能对你有帮助。

Answer 3

以下说明不返回任何位置值部分：
LocationRequest。PRIORITY_NO_POWER：

除非其他客户请求，否则不会返回任何地点位置更新，在这种情况下，此请求将充当被动倾听那些地点。

对于FusedLocationProvider，

no explicitly unique source is specified anywhere within documentation。

因此，为了在不启用GPS的情况下获取位置，您可以信任PRIORITY_BALANCED_POWER_ACCURACY。根据我的观察，只有PRIORITY_HIGH_ACCURACY以强制方式使用GPS。

平板电脑可能只支持wifi或没有SIM卡，与其他设备不同，它排除了其他应用程序获取位置的情况 - 可能使用网络。

Answer 4

您必须在模拟器中将位置精度设置为仅设备。高精度或省电不适用于模拟器中的FusedLocationProviderApi。

Android：关闭位置时，Google Fused Location无效

4 个答案: