Android LocationManager网络提供程序返回null [英] Android LocationManager network provider returns null
问题描述
我想要使用Android App获取我的GPS坐标。我开始开发，我可以获得GPS坐标，但它们不准确。我想使用NETWORK_PROVIDER，但此提供程序的位置始终为空。更有趣的是，isProvicerEnabled返回true。
我使用了这个线程的例子（最佳答案）
在此输入链接描述
private void _getLocation（）{
//获取位置管理器
try {
boolean isGPSEnabled = false;
boolean isNetworkEnabled = false;
locationManager =（LocationManager）getApplicationContext（）。getSystemService（LOCATION_SERVICE）;
位置位置= null;
double latitude = -1;
double longitude = -1;
//获取GPS状态
isGPSEnabled = locationManager
.isProviderEnabled（LocationManager.GPS_PROVIDER）;
//获取网络状态
isNetworkEnabled = locationManager
.isProviderEnabled（LocationManager.NETWORK_PROVIDER）;
$ b $如果（！isGPSEnabled&&！isNetworkEnabled）{
//没有网络提供者被启用
} else {
if（isNetworkEnabled）{
showToast（网络）;
locationManager.requestLocationUpdates（
LocationManager.NETWORK_PROVIDER，
1000，
0，this）;
Log.d（Network，Network Enabled）;
if（locationManager！= null）{
location = locationManager
.getLastKnownLocation（LocationManager.NETWORK_PROVIDER）;
if（location！= null）{
latitude = location.getLatitude（）;
longitude = location.getLongitude（）;
$ b //如果GPS启用使用GPS服务获得经纬度
else if（isGPSEnabled）{
showToast（gps ）;
if（location == null）{
locationManager.requestLocationUpdates（
LocationManager.GPS_PROVIDER，
1000，
0，this）;
Log.d（GPS，GPS已启用）;
if（locationManager！= null）{
location = locationManager
.getLastKnownLocation（LocationManager.GPS_PROVIDER）;
if（location！= null）{
latitude = location.getLatitude（）;
longitude = location.getLongitude（）;
}
}
}
}
}
showToast（+ latitude + longitude）;
} catch（Exception e）{
e.printStackTrace（）;
}
我拥有清单中的所有权限
<使用权限android：name =android.permission.INTERNET/>
< uses-permission android：name =android.permission.ACCESS_NETWORK_STATE/>
< uses-permission android：name =android.permission.ACCESS_FINE_LOCATION/>
< uses-permission android：name =android.permission.ACCESS_COARSE_LOCATION/>
我知道代码很脏，但现在只用于测试。我想念什么？我在很多地方发现了类似的例子，它看起来很直，所以我有点困惑。
我的手机工作正常，GPS和网络正常工作。例如，Google地图应用程序我运行良好。任何建议？
请不要使用此代码。这不好。它有很多错误。另外，如果getLastKnownLocation还没有位置，它将返回null。如果手机上没有人使用requestUpdates，它总会这样。
您的代码是从一个名为GPSTracker的非常老的线程上发布的类中提取的。我一直试图在几个月内杀死这些代码 - 这会产生比问题更多的问题。如果您想要更好的示例代码，请尝试 http://gabesechansoftware.com/location-tracking/ 这是我写的博客文章关于代码是多么糟糕。它会告诉你正确的做法，并解释一些该代码有什么问题。
I wanted to get my GPS coordinates using Android App. I started developing, and I can get GPS coordinates, but they are not accurate. I wanted to use NETWORK_PROVIDER, but the Location by this provider is always null. More interesting, isProvicerEnabled returns true.
I used example from this thread (best answer) enter link description here
private void _getLocation() {
// Get the location manager
try {
boolean isGPSEnabled = false;
boolean isNetworkEnabled = false;
locationManager = (LocationManager) getApplicationContext().getSystemService(LOCATION_SERVICE);
Location location = null;
double latitude = -1;
double longitude = -1;
// getting GPS status
isGPSEnabled = locationManager
.isProviderEnabled(LocationManager.GPS_PROVIDER);
// getting network status
isNetworkEnabled = locationManager
.isProviderEnabled(LocationManager.NETWORK_PROVIDER);
if (!isGPSEnabled && !isNetworkEnabled) {
// no network provider is enabled
} else {
if (isNetworkEnabled) {
showToast("network");
locationManager.requestLocationUpdates(
LocationManager.NETWORK_PROVIDER,
1000,
0, this);
Log.d("Network", "Network Enabled");
if (locationManager != null) {
location = locationManager
.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
if (location != null) {
latitude = location.getLatitude();
longitude = location.getLongitude();
}
}
}
// if GPS Enabled get lat/long using GPS Services
else if (isGPSEnabled) {
showToast("gps");
if (location == null) {
locationManager.requestLocationUpdates(
LocationManager.GPS_PROVIDER,
1000,
0, this);
Log.d("GPS", "GPS Enabled");
if (locationManager != null) {
location = locationManager
.getLastKnownLocation(LocationManager.GPS_PROVIDER);
if (location != null) {
latitude = location.getLatitude();
longitude = location.getLongitude();
}
}
}
}
}
showToast("" + latitude + longitude);
} catch (Exception e) {
e.printStackTrace();
}
I have all the permissions in manifest
<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"/>
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>
I know the code is dirty, but for now it's only for testing. Do I miss something? I found similar examples in many places, and it seems pretty straight, so I am a little confused. My phone works ok, GPS and network works fine. For example Google Maps application I have works well. Any suggestions?
Please do NOT use this code. It's bad. It has a lot of errors. Also, getLastKnownLocation will return null if it doesn't have a location yet. Which it always will if nobody on the phone is using requestUpdates.
Your code is taken from a class that was posted on a very old thread on here called GPSTracker. I've been trying to kill that code for months- it causes far more problems than it helps. If you want better example code, try http://gabesechansoftware.com/location-tracking/ which is a blog post I wrote about how bad that code is. It will show you the correct way to do it, and explains some of what's wrong with that code.
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