无法获取位置管理器里面的工作片段 [英] Can't get Location Manager to work inside Fragment

问题描述

我一直在试图让一个位置管理到几个小时的工作，现在我的片段中。
我发现有关类似问题的出现StackOverflow的问题，并试图实施该解决方案。
答案是位于：<一href=\"http://stackoverflow.com/a/18533440/3035598\">http://stackoverflow.com/a/18533440/3035598

I've been trying to get a Location Manager to work for a few hours now inside my Fragment. I found a StackOverflow question about a similar problem, and tried to implement the solution. The answer is located here: http://stackoverflow.com/a/18533440/3035598

所以，我几乎逐字复制一切的答案说，但它不是为我工作。
当打开地图我得到的错误谷歌Play服务。这是因为你可以在复读NullPointerException异常引起的。

So i almost literally copied everything the answer said, but it is not working for me. When the map opens I get the error "Google Play Services Missing". This is caused by a NullPointerException as you can read in the answer.

我不知道为什么它不工作，因为我所做的一切，他说。

I have no idea why it is not working, since I did everything he said.

有谁知道是怎么回事了？

Does anyone know what's going wrong?

如果我必须提供我的code，让我知道，我会做到这一点，但它几乎等同于我所提供的链接。

If I have to provide my code, let me know and I will do that, but it is almost the same as in the link I provided.

编辑：

在code我使用：

package com.example.bt6_aedapp;

import android.location.Location;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.util.Log;
import android.view.InflateException;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.Toast;

import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.GooglePlayServicesClient;
import com.google.android.gms.location.LocationClient;
import com.google.android.gms.location.LocationListener;
import com.google.android.gms.location.LocationRequest;
import com.google.android.gms.maps.CameraUpdate;
import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.MapFragment;
import com.google.android.gms.maps.MapsInitializer;
import com.google.android.gms.maps.model.LatLng;

public class fragmentB extends Fragment implements GooglePlayServicesClient.ConnectionCallbacks,
GooglePlayServicesClient.OnConnectionFailedListener,
LocationListener {

    private GoogleMap map;
    private LatLng latlng;

    private LocationRequest lr;
    private LocationClient lc;

    MapFragment mapFragment;
    ImageView iv;

    private static View view;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, 
            Bundle savedInstanceState) {
        if(view != null) {
            ViewGroup parent = (ViewGroup) view.getParent();
            if(parent != null) {
                parent.removeView(view);
            }
        }

        try {
            view = inflater.inflate(R.layout.fragment_b, container, false); 

            mapFragment = ((MapFragment) this.getActivity().getFragmentManager().findFragmentById(R.id.map));
            iv = (ImageView) view.findViewById(R.id.iv);

            map = mapFragment.getMap();
            map.getUiSettings().setAllGesturesEnabled(false);
            map.getUiSettings().setMyLocationButtonEnabled(false);
            map.setMyLocationEnabled(true);
            map.getUiSettings().setZoomControlsEnabled(false);

            MapsInitializer.initialize(this.getActivity());
        } 
        catch (InflateException e) {
            Toast.makeText(getActivity(), "Problems inflating the view !", Toast.LENGTH_LONG).show();
        } 
        catch (NullPointerException e) {
            Toast.makeText(getActivity(), "Google Play Services missing !", Toast.LENGTH_LONG).show();
        }

        return view;
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        lr = LocationRequest.create();
        lr.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
        lc = new LocationClient(this.getActivity().getApplicationContext(),
                this, this);
        lc.connect();
    }

    @Override
    public void onLocationChanged(Location location) {      
        latlng = new LatLng(location.getLatitude(), location.getLongitude());
        CameraUpdate cameraUpdate = CameraUpdateFactory.newLatLngZoom(latlng, 10);
        map.animateCamera(cameraUpdate);
    }

     @Override
     public void onConnectionFailed(ConnectionResult arg0) {

     }

     @Override
     public void onConnected(Bundle connectionHint) {
         lc.requestLocationUpdates(lr, this);

     }

     @Override
     public void onDisconnected() {

     }  
}

现在我得到的错误是位于115行：
    显示java.lang.NullPointerException
    在com.example.bt6_aedapp.fragmentB.onLocationChanged（fragmentB.java:155）

The error I'm getting now is located at row 115: java.lang.NullPointerException at com.example.bt6_aedapp.fragmentB.onLocationChanged(fragmentB.java:155)

我查了location.getLatitude（）和location.getLongitude（）和两者都是不为空，它们返回正确的值。

I checked the location.getLatitude() and location.getLongitude() and both of them are NOT empty, they return a correct value.

推荐答案

好吧，所以很多的调试和研究之后，我已经找到了解决方案。

Alright, so after a lot of debugging and research, I've found the solution.

我所要做的就是替换

`mapFragment = ((MapFragment) this.getActivity().getFragmentManager().findFragmentById(R.id.map));`

与

mapFragment =（（SupportMapFragment）getFragmentManager（）findFragmentById（R.id.map））;

这篇关于无法获取位置管理器里面的工作片段的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！