android 经纬度为空,Android GPS getLastKnownLocation()返回null的解决
Android GPS getLastKnownLocation()返回null的解决
(2014-02-20 09:25:50)
标签：
getlastknownlocation
it
在使用LocationManager.getLastKnownLocation("gps")获取gps定位的过程中老是报空指针异常
在网上百度查了不少资料发现这个问题多出现在2.0以上版本
解决方法多是:
1.在AndroidManifest.xml中添加
Xml代码
[xml] view plaincopyprint?
2.在emulator control中手动设置经纬度
但是我的程序这些都写了依旧报空指针
后来在外国论坛上终于找到一些启发
一个哥们这样写代码
Java代码
LocationManager mgr = (LocationManager)
getSystemService(Context.LOCATION_SERVICE);
Location location =
mgr.getLastKnownLocation(bundle.getString("provider"));
while(location == null)
{
mgr.requestLocationUpdates("gps", 60000, 1,
locationListener);
}
[java] view plaincopyprint?
LocationManager mgr = (LocationManager)
getSystemService(Context.LOCATION_SERVICE);
Location location =
mgr.getLastKnownLocation(bundle.getString("provider"));
while(location == null)
{
mgr.requestLocationUpdates("gps", 60000, 1,
locationListener);
}
我试了一下还真有效,他的解释是用debug发现getLastKnownLocation()方法不是一次就能定位的，必须多次才能成功。
但是显然这样用循环一直等待很没效率,所以我重写了MapActivity的方法
Java代码
@Override
protected void onResume() {
super.onResume();
mgr.requestLocationUpdates(bundle.getString("provider"), 60000, 1,
locationListener);
}
@Override
protected void onPause() {
super.onPause();
mgr.removeUpdates(locationListener);
}
[java] view plaincopyprint?
@Override
protected void onResume() {
super.onResume();
mgr.requestLocationUpdates(bundle.getString("provider"), 60000, 1,
locationListener);
}
@Override
protected void onPause() {
super.onPause();
mgr.removeUpdates(locationListener);
}
一样也成功了。。
在外国技术论坛上找了个解释，个人感觉很贴切:
The call to request update for a location is not blocking, hence it
wont wait there. Also the provider in emulator may not have been
started.
A possible check could be to see if the settings in it disable gps
provider ? then send geo fix.
However, I would use Location Listener, it would be ideal in your
case since you need a geo fix to proceed further.Location Listener
is Used for receiving notifications from the LocationManager when
the location has changed. You can unregister the listener after
first geofix.
Note: It can take some time on device to get current location, and
even on device this can return null.
具体可见
http://stackoverflow.com/questions/1608632/android-locationmanager-getlastknownlocation-returns-null
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