此刻我正在创建位置客户端,
public void startUpdatingLocationProcess(Context context) {
parentContext = context;
if (mFusedLocationClient == null){
mFusedLocationClient = LocationServices.getFusedLocationProviderClient(parentContext);
LocationRequest mLocationRequest = new LocationRequest();
mLocationRequest.setInterval(5000);
mLocationRequest.setFastestInterval(5000);
mLocationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
if (ContextCompat.checkSelfPermission(parentContext, Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED)
{
mFusedLocationClient.requestLocationUpdates(mLocationRequest, new LocationCallback(){
@Override
public void onLocationResult(LocationResult locationResult) {
onLocationChanged(locationResult.getLastLocation());
}
} , Looper.myLooper());
}
}
这是我要在整个应用程序生命周期中运行的LocationApi类中,此特定应用程序运行许多活动,因此我不想在每次销毁并创建新活动时“重新创建”请求。
允许并检查FINE_LOCATION的权限,logcat中没有错误,并且代码在创建mFusedLocationClient对象时运行requestLocationUpdates方法,但从未调用过“ onLocationResult”方法。
使用此api是否缺少我的东西?
答案 0 :(得分:2)
在请求位置更新之前,您的应用必须连接到位置服务并发出位置请求。 像这样的东西:
private static LocationRequest createLocationRequest() {
LogHelper.trace("createLocationRequest");
LocationRequest mLocationRequest = new LocationRequest();
mLocationRequest.setInterval(200000);
mLocationRequest.setFastestInterval(300000);
mLocationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
return mLocationRequest;
}
public static void checkLocationService(final Fragment fragment, final FusedLocationProviderClient client, final OnSuccessListener<LocationSettingsResponse> successListener, OnFailureListener failureListener) {
LogHelper.trace("checkLocationService");
final LocationRequest request = createLocationRequest();
LocationSettingsRequest.Builder builder = new LocationSettingsRequest.Builder()
.addLocationRequest(request);
SettingsClient settingsClient = LocationServices.getSettingsClient(fragment.getActivity());
Task<LocationSettingsResponse> task = settingsClient.checkLocationSettings(builder.build());
task.addOnSuccessListener(fragment.getActivity(), new OnSuccessListener<LocationSettingsResponse>() {
@Override
public void onSuccess(LocationSettingsResponse locationSettingsResponse) {
LogHelper.trace("onSuccess");
startLocationService(client, request, new LocationCallback());
successListener.onSuccess(locationSettingsResponse);
}
});
task.addOnFailureListener(fragment.getActivity(), failureListener);
}
答案 1 :(得分:1)
尝试通过android设置激活/停用位置。
答案 2 :(得分:0)
location == null
。
另见LocationAvailability No Location Available。如果你打电话
fusedLocationClient.getLocationAvailability()
.addOnSuccessListener(this, locationAvailability -> {
})
您会看到 LocationAvailability[isLocationAvailable: false]
。
可能是因为旧的模拟器或
locationRequest = LocationRequest.create();
locationRequest
.setNumUpdates(1)
.setFastestInterval(0)
.setSmallestDisplacement(0)
如果你设置了setNumUpdates(1)
,它只会返回一次坐标,可能会有null
。我删除了这些行并使用
@SuppressLint("MissingPermission")
private fun startLocationUpdates() {
fusedLocationProviderClient?.requestLocationUpdates(locationRequest, locationCallback, Looper.getMainLooper())
}
开始搜索位置,然后
locationCallback = object : LocationCallback() {
override fun onLocationResult(locationResult: LocationResult?) {
super.onLocationResult(locationResult)
if (locationResult?.lastLocation == null) {
Timber.d("Location missing in callback.")
} else {
Timber.d(
"Location Callback ${locationResult.lastLocation}")
latitude = locationResult.lastLocation.latitude
longitude = locationResult.lastLocation.longitude
stopLocationUpdates()
}
}
}
fusedLocationProviderClient?.lastLocation
?.addOnSuccessListener { location ->
Timber.d("lastLocation success $location")
if (location == null) {
startLocationUpdates()
} else {
latitude = location.latitude
longitude = location.longitude
}
}
?.addOnFailureListener { failure ->
Timber.d("lastLocation failure ${failure.message}")
}
接收坐标。