从类android获取位置 _Android

实践是知识的母亲，知识是生活的明灯。这篇文章主要讲述从类android获取位置相关的知识，希望能为你提供帮助。
我正在寻找一个获得lat和long的位置的课程。我从片段调用此类，这将获得最佳提供程序并调用方法来获取位置var。我有这个变量位置，但是当我返回变量pos时，position为null; 为什么？我传递这个变量？
var pos into方法没关系，但是当我返回时为null。

public class locationmng { public Context context; private FusedLocationProviderClient fusedLocationProviderClient; Location position; public locationmng(Context c){ context=c; }public Location GetLoc(){ if(ContextCompat.checkSelfPermission(context, Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED) {LocationManager lm = (LocationManager) context.getSystemService(Context.LOCATION_SERVICE); Criteria criteria = new Criteria(); String bestProvider = lm.getBestProvider(criteria, true); if (bestProvider.equals(LocationManager.NETWORK_PROVIDER)) {position = getcoarseposition(); return position; }

}

@SuppressLint("MissingPermission") publicLocation getcoarseposition() { final Location[] pos = new Location[1]; fusedLocationProviderClient= LocationServices.getFusedLocationProviderClient(context); fusedLocationProviderClient.getLastLocation() .addOnSuccessListener((Activity) context, new OnSuccessListener< Location> () { @Override public void onSuccess(Location location) { if (location != null) { pos[0] =location; }else { Log.i("locmng","not found loc "); }} }); Log.i("locationmanager6894","ho trovato "+ a[0].getLongitude()+ "lat: "+ a[0].getLatitude()); return pos[0]; }

答案您的位置在

OnSuccessListener<
Location>
()

，它不会立即拨打电话。因此，您设置了一个监听器，但只有在获得您的位置时才会调用它。那么，你需要做什么：在你的听众的GetLoc()方法中做onSuccess(Location location)中定义的所有逻辑。
另一答案可能并非所有位置设置都满足。您应该使用SettingsClient类提示用户更改其位置设置。文档：https://developer.android.com/training/location/change-location-settings
【从类android获取位置】基本上你必须：

创建位置请求

protected void createLocationRequest() { LocationRequest mLocationRequest = new LocationRequest(); mLocationRequest.setInterval(10000); mLocationRequest.setFastestInterval(5000); mLocationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY); }

获取当前位置设置

LocationSettingsRequest.Builder builder = new LocationSettingsRequest.Builder(); SettingsClient client = LocationServices.getSettingsClient(this); Task< LocationSettingsResponse> task = client.checkLocationSettings(builder.build());

添加任务完整侦听器以了解您的位置设置是否正常

task.addOnSuccessListener(this, new OnSuccessListener< LocationSettingsResponse> () { @Override public void onSuccess(LocationSettingsResponse locationSettingsResponse) { // All location settings are satisfied. The client can initialize // location requests here. // ... } }); task.addOnFailureListener(this, new OnFailureListener() { @Override public void onFailure(@NonNull Exception e) { if (e instanceof ResolvableApiException) { // Location settings are not satisfied, but this can be fixed // by showing the user a dialog. try { // Show the dialog by calling startResolutionForResult(), // and check the result in onActivityResult(). ResolvableApiException resolvable = (ResolvableApiException) e; resolvable.startResolutionForResult(MainActivity.this, REQUEST_CHECK_SETTINGS); } catch (IntentSender.SendIntentException sendEx) { // Ignore the error. } } } });

完成这三个步骤后，您将能够获得用户位置