Android getLastLocation（）在从设置Api对话框打开位置后返回null

我使用以下功能打开设置API对话框，使用户能够打开位置服务，然后访问用户的当前位置：

 public void onConnected(Bundle bundle) {

    if(ContextCompat.checkSelfPermission(getApplicationContext(), android.Manifest.permission.ACCESS_FINE_LOCATION)== PackageManager.PERMISSION_GRANTED) {
        googleMapGlobal.setMyLocationEnabled(true);
        Location mCurrentLocation = LocationServices.FusedLocationApi.getLastLocation(googleApiClient);
        if (mCurrentLocation == null) {
           // Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
            //getApplicationContext().startActivity(intent);
            LocationRequest locationRequest = LocationRequest.create();
            locationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
            locationRequest.setInterval(30 * 1000);
            locationRequest.setFastestInterval(5 * 1000);
            LocationSettingsRequest.Builder builder = new LocationSettingsRequest.Builder().addLocationRequest(locationRequest);
            builder.setAlwaysShow(true);
            PendingResult<LocationSettingsResult> result =
                    LocationServices.SettingsApi.checkLocationSettings(googleApiClient, builder.build());
            result.setResultCallback(new ResultCallback<LocationSettingsResult>() {
                @Override
                public void onResult(LocationSettingsResult result) {
                    final Status status = result.getStatus();
                    final LocationSettingsStates state = result.getLocationSettingsStates();
                    switch (status.getStatusCode()) {
                        case LocationSettingsStatusCodes.SUCCESS:
                            // All location settings are satisfied. The client can initialize location
                            // requests here.
                            break;
                        case LocationSettingsStatusCodes.RESOLUTION_REQUIRED:
                            // Location settings are not satisfied. But could be fixed by showing the user
                            // a dialog.
                            try {
                                // Show the dialog by calling startResolutionForResult(),
                                // and check the result in onActivityResult().
                                status.startResolutionForResult(VendorsOnMap.this, 1000);
                            } catch (IntentSender.SendIntentException e) {
                                // Ignore the error.
                            }
                            break;
                        case LocationSettingsStatusCodes.SETTINGS_CHANGE_UNAVAILABLE:
                            // Location settings are not satisfied. However, we have no way to fix the
                            // settings so we won't show the dialog.
                            break;
                    }
                }
            });
        } else {
            CameraPosition position = CameraPosition.builder()
                    .target(new LatLng(mCurrentLocation.getLatitude(),
                            mCurrentLocation.getLongitude()))
                    .zoom(15f)
                    .bearing(0.0f)
                    .tilt(0.0f)
                    .build();
            googleMapGlobal.animateCamera(CameraUpdateFactory
                    .newCameraPosition(position), null);
            LatLng latLng = new LatLng(31.220, 75.750);
            Toast.makeText(getApplicationContext(), mCurrentLocation.getLatitude() + ", " + mCurrentLocation.getLongitude(), Toast.LENGTH_LONG).show();
            googleMapGlobal.addMarker(new MarkerOptions().position(latLng).title("Marker here"));
        }
    }
    else{
        ActivityCompat.requestPermissions(getParent(),
                new String[]{android.Manifest.permission.ACCESS_FINE_LOCATION}, MY_PERMISSION_ACCESS_FINE_LOCATION);
    }

}


protected void onActivityResult(int requestCode, int resultCode, Intent intent) {
    final LocationSettingsStates states = LocationSettingsStates.fromIntent(intent);
    if (ContextCompat.checkSelfPermission(getApplicationContext(), android.Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED) {
        {
            Toast.makeText(getApplicationContext(), resultCode + " " + Activity.RESULT_OK, Toast.LENGTH_SHORT).show();
            switch (requestCode) {
                case 1000:
                    switch (resultCode) {
                        case Activity.RESULT_OK:
                            googleMapGlobal.setMyLocationEnabled(true);
                            Location mCurrentLocation;
                            mCurrentLocation = LocationServices.FusedLocationApi.getLastLocation(googleApiClient);
                            CameraPosition position = CameraPosition.builder()
                                    .target(new LatLng(mCurrentLocation.getLatitude(), mCurrentLocation.getLongitude()))
                                    .zoom(15f)
                                    .bearing(0.0f)
                                    .tilt(0.0f)
                                    .build();
                            googleMapGlobal.animateCamera(CameraUpdateFactory.newCameraPosition(position), null);
                            LatLng latLng = new LatLng(31.220, 75.750);
                            Toast.makeText(getApplicationContext(), mCurrentLocation.getLatitude() + ", " + mCurrentLocation.getLongitude(), Toast.LENGTH_LONG).show();
                            googleMapGlobal.addMarker(new MarkerOptions().position(latLng).title("Marker here"));
                            break;
                        case Activity.RESULT_CANCELED:
                            break;
                        default:
                            break;
                    }
                    break;
            }
        }
    }
}

public void未连接（捆绑）{
if（ContextCompat.checkSelfPermission（getApplicationContext（），android.Manifest.permission.ACCESS\u FINE\u LOCATION）==PackageManager.permission\u已授予）{
googleMapGlobal.setMyLocationEnabled（true）；
Location mCurrentLocation=LocationServices.FusedLocationApi.getLastLocation（GoogleAppClient）；
if（mCurrentLocation==null）{
//意向意向=新意向（设置、动作、位置、来源、设置）；
//getApplicationContext（）.startActivity（intent）；
LocationRequest LocationRequest=LocationRequest.create（）；
locationRequest.setPriority（locationRequest.PRIORITY\u高精度）；
位置请求设置间隔（30*1000）；
locationRequest.SetFastTestInterval（5*1000）；
LocationSettingsRequest.Builder=新建LocationSettingsRequest.Builder（）.addLocationRequest（locationRequest）；
builder.setAlwaysShow（true）；
Pendingreult结果=
LocationServices.SettingsApi.checkLocationSettings（GoogleAppClient，builder.build（））；
result.setResultCallback（新的ResultCallback（）{
@凌驾
公共void onResult（位置设置结果）{
最终状态状态=result.getStatus（）；
最终位置SettingsStates状态=结果。getLocationSettingsStates（）；
开关（status.getStatusCode（））{
案例位置设置StatusCodes.SUCCESS：
//满足所有位置设置。客户端可以初始化位置
//请求在这里。
打破
案例位置设置StatusCodes.RESOLUTION_要求：
//不满足位置设置。但可以通过显示用户来修复
//对话。
试一试{
//通过调用startResolutionForResult（）显示对话框，
//并在onActivityResult（）中检查结果。
status.StartResult解决方案（VendorsOnMap.this，1000）；
}catch（IntentSender.sendtintentexe）{
//忽略错误。
}
打破
案例位置设置StatusCodes.SETTINGS\u CHANGE\u不可用：
//位置设置不满意。但是，我们无法修复此问题
//设置，这样我们就不会显示对话框。
打破
}
}
});
}否则{
CameraPosition位置=CameraPosition.builder（）
.target（新LatLng（mCurrentLocation.getLatitude（），
mCurrentLocation.getLongitude（））
.zoom（15f）
.轴承（0.0f）
.倾斜（0.0f）
.build（）；
googleMapGlobal.animateCamera（CameraUpdateFactory
.newCameraPosition（位置），空）；
LatLng LatLng=新LatLng（31.220,75.750）；
Toast.makeText（getApplicationContext（），mCurrentLocation.getLatitude（）+”，“+mCurrentLocation.getLatitude（），Toast.LENGTH_LONG）.show（）；
googleMapGlobal.addMarker（新的MarkerOptions（）.position（latLng.title）（“此处的标记”）；
}
}
否则{
ActivityCompat.requestPermissions（getParent（），
新字符串[]{android.Manifest.permission.ACCESS_FINE_LOCATION}，MY_permission_ACCESS_FINE_LOCATION}）；
}
}
ActivityResult上受保护的void（int-requestCode、int-resultCode、Intent-Intent）{
最终位置设置状态=位置设置状态。来自意图（意图）；
if（ContextCompat.checkSelfPermission（getApplicationContext（），android.Manifest.permission.ACCESS\u FINE\u LOCATION）==PackageManager.permission\u已授予）{
{
Toast.makeText（getApplicationContext（），resultCode+“”+Activity.RESULT\u确定，Toast.LENGTH\u SHORT）.show（）；
开关（请求代码）{
案例1000：
开关（结果代码）{
案例活动。结果\u正常：
googleMapGlobal.setMyLocationEnabled（true）；
位置mCurrentLocation；
mCurrentLocation=LocationServices.FusedLocationApi.getLastLocation（GoogleAppClient）；
CameraPosition位置=CameraPosition.builder（）
.target（新LatLng（mCurrentLocation.getLatitude（），mCurrentLocation.getLongitude（））
.zoom（15f）
.轴承（0.0f）
.倾斜（0.0f）
.build（）；
googleMapGlobal.animateCamera（CameraUpdateFactory.newCameraPosition（position），null）；
LatLng LatLng=新LatLng（31.220,75.750）；
Toast.makeText（getApplicationContext（），mCurrentLocation.getLatitude（）+”，“+mCurrentLocation.getLatitude（），Toast.LENGTH_LONG）.show（）；
googleMapGlobal.addMarker（新的MarkerOptions（）.position（latLng.title）（“此处的标记”）；
打破
案例活动.RESULT\u已取消：
打破
违约：
打破
}
打破
}
}
public void onConnected(Bundle bundle) {

    if(ContextCompat.checkSelfPermission(getApplicationContext(), android.Manifest.permission.ACCESS_FINE_LOCATION)== PackageManager.PERMISSION_GRANTED) {
        googleMapGlobal.setMyLocationEnabled(true);
        locationRequest = LocationRequest.create();
        locationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
        locationRequest.setInterval(0);
        locationRequest.setFastestInterval(5 * 1000);
        locationRequest.setNumUpdates(5);
        LocationServices.FusedLocationApi.requestLocationUpdates(googleApiClient, locationRequest, this);
           // Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
            //getApplicationContext().startActivity(intent);
            LocationSettingsRequest.Builder builder = new LocationSettingsRequest.Builder().addLocationRequest(locationRequest);
            builder.setAlwaysShow(true);
            PendingResult<LocationSettingsResult> result =
                    LocationServices.SettingsApi.checkLocationSettings(googleApiClient, builder.build());
            result.setResultCallback(new ResultCallback<LocationSettingsResult>() {
                @Override
                public void onResult(LocationSettingsResult result) {
                    final Status status = result.getStatus();
                    final LocationSettingsStates state = result.getLocationSettingsStates();
                    switch (status.getStatusCode()) {
                        case LocationSettingsStatusCodes.SUCCESS:
                            // All location settings are satisfied. The client can initialize location
                            // requests here.
                            while(mCurrentLocation==null) {
                                if(ContextCompat.checkSelfPermission(getApplicationContext(), android.Manifest.permission.ACCESS_FINE_LOCATION)== PackageManager.PERMISSION_GRANTED)
                                    mCurrentLocation=LocationServices.FusedLocationApi.getLastLocation(googleApiClient);
                            }
                            CameraPosition position = CameraPosition.builder()
                                    .target(new LatLng(mCurrentLocation.getLatitude(),
                                            mCurrentLocation.getLongitude()))
                                    .zoom(15f)
                                    .bearing(0.0f)
                                    .tilt(0.0f)
                                    .build();
                            googleMapGlobal.animateCamera(CameraUpdateFactory
                                    .newCameraPosition(position), null);
                            LatLng latLng = new LatLng(31.220, 75.750);
                            Toast.makeText(getApplicationContext(), mCurrentLocation.getLatitude() + ", " + mCurrentLocation.getLongitude(), Toast.LENGTH_LONG).show();
                            googleMapGlobal.addMarker(new MarkerOptions().position(latLng).title("Marker here"));
                            break;
                        case LocationSettingsStatusCodes.RESOLUTION_REQUIRED:
                            // Location settings are not satisfied. But could be fixed by showing the user
                            // a dialog.
                            try {
                                // Show the dialog by calling startResolutionForResult(),
                                // and check the result in onActivityResult().
                                status.startResolutionForResult(VendorsOnMap.this, 1000);
                            } catch (IntentSender.SendIntentException e) {
                                // Ignore the error.
                            }
                            break;
                        case LocationSettingsStatusCodes.SETTINGS_CHANGE_UNAVAILABLE:
                            // Location settings are not satisfied. However, we have no way to fix the
                            // settings so we won't show the dialog.
                            break;
                    }
                }
            });


    }
    else{
        ActivityCompat.requestPermissions(getParent(),
                new String[]{android.Manifest.permission.ACCESS_FINE_LOCATION}, MY_PERMISSION_ACCESS_FINE_LOCATION);
    }

}


protected void onActivityResult(int requestCode, int resultCode, Intent intent) {
    final LocationSettingsStates states = LocationSettingsStates.fromIntent(intent);
    if (ContextCompat.checkSelfPermission(getApplicationContext(), android.Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED) {
        {
            Toast.makeText(getApplicationContext(), resultCode + " " + Activity.RESULT_OK, Toast.LENGTH_SHORT).show();
            switch (requestCode) {
                case 1000:
                    switch (resultCode) {
                        case Activity.RESULT_OK:
                            while (mCurrentLocation==null){
                                mCurrentLocation=LocationServices.FusedLocationApi.getLastLocation(googleApiClient);
                            }
                            CameraPosition position = CameraPosition.builder()
                                    .target(new LatLng(mCurrentLocation.getLatitude(), mCurrentLocation.getLongitude()))
                                    .zoom(15f)
                                    .bearing(0.0f)
                                    .tilt(0.0f)
                                    .build();

                            googleMapGlobal.animateCamera(CameraUpdateFactory.newCameraPosition(position), null);
                            LatLng latLng = new LatLng(31.220, 75.750);
                            Toast.makeText(getApplicationContext(), mCurrentLocation.getLatitude() + ", " + mCurrentLocation.getLongitude(), Toast.LENGTH_LONG).show();
                            googleMapGlobal.addMarker(new MarkerOptions().position(latLng).title("Marker here"));
                            break;
                        case Activity.RESULT_CANCELED:
                            break;
                        default:
                            break;
                    }
                    break;
            }
        }
    }