永远不会调用OnLocationChanged回调

Question

我试图让用户使用当前位置LocationManager.我做了很多研究,似乎找不到任何有同样问题的人.该OnLocationChanged回调似乎永远不会被调用.下面是我的各种代码和logcat.

protected LocationListener locationListener;
protected LocationManager locationManager;
protected Context context;

我的OnCreate()方法

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    Log.v(TAG, "IN ON CREATE");

    this.context = getActivity();

    registerLocationUpdates();
}

我的registerLocationUpdates方法

void registerLocationUpdates() {
    Criteria criteria = new Criteria();
    criteria.setAccuracy(Criteria.ACCURACY_LOW);
    criteria.setPowerRequirement(Criteria.POWER_LOW);
    criteria.setAltitudeRequired(false);
    criteria.setBearingRequired(false);

    locationManager = (LocationManager)getActivity().getSystemService(LOCATION_SERVICE);

    provider = locationManager.getBestProvider(criteria, true);

    // Cant get a hold of provider
    if (provider == null) {
        Log.v(TAG, "Provider is null");
        showNoProvider();
        return;
    } else {
        Log.v(TAG, "Provider: " + provider);
    }

    locationListener = new MyLocationListener();

    locationManager.requestLocationUpdates(provider, 1L, 1f, locationListener);

    // connect to the GPS location service
    Location oldLocation = locationManager.getLastKnownLocation(provider);

    if (oldLocation != null)  {
        Log.v(TAG, "Got Old location");
        latitude = Double.toString(oldLocation.getLatitude());
        longitude = Double.toString(oldLocation.getLongitude());
        waitingForLocationUpdate = false;
        getNearbyStores();
    } else {
        Log.v(TAG, "NO Last Location found");
    }
}

我的 LocationListener

private class MyLocationListener implements LocationListener {

    public void onLocationChanged(Location location) {
        latitude = Double.toString(location.getLatitude());
        longitude = Double.toString(location.getLongitude());

        Log.v(TAG, "IN ON LOCATION CHANGE");

        if (waitingForLocationUpdate) {
            getNearbyStores();
            waitingForLocationUpdate = false;
        }

        locationManager.removeUpdates(this);
    }

    public void onStatusChanged(String s, int i, Bundle bundle) {
        Log.v(TAG, "Status changed: " + s);
    }

    public void onProviderEnabled(String s) {
        Log.e(TAG, "PROVIDER DISABLED: " + s);
    }

    public void onProviderDisabled(String s) {
        Log.e(TAG, "PROVIDER DISABLED: " + s);
    }
}

我在AndroidManifest中的权限

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

最后我运行我的应用程序后的logcat

01-25 09:43:10.963: VERBOSE/NearbyListFragment(3060): IN ON CREATE
01-25 09:43:10.963: VERBOSE/LocationManagerService(1329): getProviders
01-25 09:43:10.963: VERBOSE/LocationManagerService(1329): getProviders
01-25 09:43:10.973: VERBOSE/LocationManagerService(1329): getProviders
01-25 09:43:10.983: VERBOSE/NearbyListFragment(3060): Provider: gps
01-25 09:43:10.983: DEBUG/LocationManager(3060): requestLocationUpdates: provider = gps, listener = co.fusionweb.dealsplus.app.NearbyItems$NearbyListFragment$MyLocationListener@46ef4680
01-25 09:43:10.983: DEBUG/GpsLocationProvider(1329): setMinTime 1
01-25 09:43:10.983: VERBOSE/NearbyListFragment(3060): NO Last Location found
01-25 09:43:10.983: VERBOSE/LocationManagerService(1329): _requestLocationUpdates: listener = Receiver{47421e68 Listener android.os.BinderProxy@47421a68}
01-25 09:43:11.003: VERBOSE/countingFragment(3060): IN ON CREATE VIEW
01-25 09:43:11.003: WARN/GpsLocationProvider(1329): Duplicate add listener for co.fusionweb.dealsplus
01-25 09:43:11.013: VERBOSE/ScrollListener(3060): In Constructor
01-25 09:43:11.013: VERBOSE/ScrollListener(3060): Scrolling
01-25 09:43:11.033: DEBUG/GpsLocationProvider(1329): startNavigating
01-25 09:43:11.043: DEBUG/lib_locapi(1329): loc_eng_set_qos_time_out(standalone = 60, agps = 89)
01-25 09:43:11.043: DEBUG/lib_locapi(1329): loc_eng_set_qos_accuracy(accuracy = 50)
01-25 09:43:11.043: VERBOSE/lib_locapi(1329): persist.radio.agps.mode: []
01-25 09:43:11.043: DEBUG/lib_locapi(1329): loc_eng_set_position mode, client = 1, interval = 1, mode = 1
01-25 09:43:11.043: VERBOSE/lib_locapi(1329): loc_eng_ioctl called: client = 1, ioctl_type = 2
01-25 09:43:11.043: VERBOSE/locapi_rpc_glue(1329): loc_ioctl
01-25 09:43:11.043: DEBUG/RPC(1329): written RPC packet size: [96]
01-25 09:43:11.043: DEBUG/RPC(1329): read RPC packet
01-25 09:43:11.043: DEBUG/RPC(1329): read RPC packet size: [28]
01-25 09:43:11.043: VERBOSE/locapi_rpc_glue(1329): loc_api_sync_ioctl: select_id = 0, loc_ioctl returned 0
01-25 09:43:11.043: DEBUG/RPC(1329): read RPC packet
01-25 09:43:11.043: DEBUG/RPC(1329): read RPC packet size: [80]
01-25 09:43:11.043: VERBOSE/locapi_rpc_glue(1329): Callback received: 80 (cb_id=0x5310000 handle=1)
01-25 09:43:11.043: DEBUG/RPC(1329): written RPC packet size: [28]
01-25 09:43:11.043: VERBOSE/lib_locapi(1329): loc_eng_ioctl result: client = 1, ioctl_type = 2, SUCCESS
01-25 09:43:11.043: DEBUG/lib_locapi(1329): loc_eng_start
01-25 09:43:11.043: DEBUG/locapi_rpc_glue(1329): loc_start_fix
01-25 09:43:11.043: DEBUG/RPC(1329): written RPC packet size: [44]
01-25 09:43:11.043: DEBUG/RPC(1329): read RPC packet
01-25 09:43:11.053: DEBUG/RPC(1329): read RPC packet size: [28]
01-25 09:43:11.103: DEBUG/RPC(1329): read RPC packet
01-25 09:43:11.103: DEBUG/RPC(1329): read RPC packet size: [80]
01-25 09:43:11.113: VERBOSE/locapi_rpc_glue(1329): Callback received: 100 (cb_id=0x5310000 handle=1)
01-25 09:43:11.113: VERBOSE/lib_locapi(1329): process_deferred_action: pthread_cond_wait returned
01-25 09:43:11.113: DEBUG/lib_locapi(1329): loc_eng_report_status: GPS_STATUS_SESSION_BEGIN
01-25 09:43:11.113: DEBUG/lib_locapi(1329): loc_eng_report_status: update status
01-25 09:43:11.113: VERBOSE/GpsLocationProvider(1329): reportStatus status: 1
01-25 09:43:11.113: DEBUG/GpsLocationProvider(1329): Acquiring wakelock
01-25 09:43:11.123: DEBUG/RPC(1329): written RPC packet size: [28]
01-25 09:43:11.183: DEBUG/PowerManagerService(1329): New lightsensor value:40, lcdValue:77
01-25 09:43:11.273: DEBUG/RPC(1329): read RPC packet
01-25 09:43:11.273: DEBUG/RPC(1329): read RPC packet size: [80]
01-25 09:43:11.273: VERBOSE/locapi_rpc_glue(1329): Callback received: 100 (cb_id=0x5310000 handle=1)
01-25 09:43:11.273: VERBOSE/lib_locapi(1329): process_deferred_action: pthread_cond_wait returned
01-25 09:43:11.273: DEBUG/lib_locapi(1329): loc_eng_report_status: GPS_STATUS_ENGINE_ON
01-25 09:43:11.273: DEBUG/lib_locapi(1329): loc_eng_report_status: update status
01-25 09:43:11.273: VERBOSE/GpsLocationProvider(1329): reportStatus status: 3

并且logcat的android SDK位置部分不断重复它们.我已经尝试了一些我能想到并在google和stackoverflow上看到过的东西.Als只是作为旁注,我已经能够使用requestSingleUpdateAPI 9中提供的2.3设备并遵循指南 A Deep Dive into Location 但是我需要它在2.1或2.2及更高版本上工作旧的SDK.因此,如果您有任何提示或想了解更多,请告诉我.提前致谢.

Answer 1

看起来你的设置应该工作,因为它没有,我会让你的例子尽可能简单,以便排除故障.我会让你的请求看起来像

requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, locationListener);
requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0, locationListener);

这样您就可以获得所有更新.并评论关于获取最后已知位置的部分.它还不需要.

然后在onLocationChanged(),只是有

Log.v(TAG, "IN ON LOCATION CHANGE, lat=" + latitude + ", lon=" + longitude);

注释其余部分,以便让你的听众保持活跃状态​​.这应该会为您提供真实设备上的更新流.在模拟器上,您需要使用DDMS,每次按下发送时都会获得一次GPS更新.

Answer 2

更换

LocationManager.GPS_PROVIDER

同

LocationManager.NETWORK_PROVIDER

解决了我的问题.

这是我的位置管理器的代码片段

 LocationManager locationManager = (LocationManager) getActivity().getSystemService(LOCATION_SERVICE);

//检查位置权限,Marshmallow及以上

        if (ActivityCompat.checkSelfPermission(getActivity(), Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED
                && ActivityCompat.checkSelfPermission(getActivity(), 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.

            Toast.makeText(getActivity(), "Not Enough Permission", Toast.LENGTH_SHORT).show();
            return;
        }

//获取当前位置

        Location myLocation = locationManager.getLastKnownLocation(LocationManager.PASSIVE_PROVIDER);

        currentLatitude = myLocation.getLatitude();
        currentLongitude = myLocation.getLongitude();

//使用LocationManager.NETWORK_PROVIDER请求位置更新

        locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER,
                MIN_TIME_BW_UPDATES,
                MIN_DISTANCE_CHANGE_FOR_UPDATES, MapFragment.this);

Answer 3

设备处于低功耗状态或使用省电模式时,GPS提供商将禁用,此时我们无法接收onLocationChanged

如果您呆在房屋或建筑物内(仅在室外工作良好),GPS提供商几乎不会返回该位置

因此,在我的应用程序中,我将使用两者GPS_PROVIDER并NETWORK_PROVIDER获得onLocationChanged()更好的

https://developer.android.com/guide/topics/location/strategies.html#Updates

要从GPS提供商请求位置更新,请使用GPS_PROVIDER而不是NETWORK_PROVIDER.您还可以通过为NETWORK_PROVIDER调用requestLocationUpdates()两次一次来请求GPS和网络位置提供程序的位置更新,对于GPS_PROVIDER调用一次.

Answer 4

正如 Steve Blackwell 所写，您的设置很好。您可以尝试的是了解您是否 100% 拥有 GPS 固定信号！我已经安装了一个不错的GPS 测试器应用程序（来自 Play 商店），它会显示您是否有修复，以及您连接到哪些卫星以及连接强度是多少。这就是我的 OnLocationChanged() 从未调用过的原因。我尝试从建筑物内运行它：\

祝你好运！