由服务发起的GPS侦听器内的Http post请求

Question

我正在做一个应用程序，其中一个服务启动一个GPSListener，它会定期获取位置更新。到这个部分它的工作正常，我正确地获得更新。

我需要将这个lat，long值更新到服务器数据库，为此我使用了对php脚本的http post请求;它单独工作fien.But当它在LocationListener中调用时，我得到以下错误stacktrace。

我如何克服这种情况并提出要求？

> android.os.NetworkOnMainThreadException
at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1117)
at java.net.InetAddress.lookupHostByName(InetAddress.java:385)
at java.net.InetAddress.getAllByNameImpl(InetAddress.java:236)
at java.net.InetAddress.getAllByName(InetAddress.java:214)
at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:137)
at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164)
at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119)
at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:360)
at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555)
at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487)
at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:465)
at com.childtrack.service.SimpleService$mylocationlistener.postData(SimpleService.java:165)
at com.childtrack.service.SimpleService$mylocationlistener.onLocationChanged(SimpleService.java:101)
at android.location.LocationManager$ListenerTransport._handleMessage(LocationManager.java:237)
at android.location.LocationManager$ListenerTransport.access$000(LocationManager.java:170)
at android.location.LocationManager$ListenerTransport$1.handleMessage(LocationManager.java:186)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:4899)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:791)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:558)
at dalvik.system.NativeStart.main(Native Method)
W/System.err(5560): android.os.NetworkOnMainThreadException
at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1117)
at java.net.InetAddress.lookupHostByName(InetAddress.java:385)
at java.net.InetAddress.getAllByNameImpl(InetAddress.java:236)
at java.net.InetAddress.getAllByName(InetAddress.java:214)
at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:137)
at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164)
at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119)
at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:360)
at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555)
at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487)
at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:465)
at com.childtrack.service.SimpleService$mylocationlistener.postData(SimpleService.java:165)
at com.childtrack.service.SimpleService$mylocationlistener.onLocationChanged(SimpleService.java:101)
at android.location.LocationManager$ListenerTransport._handleMessage(LocationManager.java:237)
at android.location.LocationManager$ListenerTransport.access$000(LocationManager.java:170)
at android.location.LocationManager$ListenerTransport$1.handleMessage(LocationManager.java:186)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:4899)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:791)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:558)
at dalvik.system.NativeStart.main(Native Method)

Answer 1

你在主（UI）线程上正在做network operation。使用asyntask进行网络操作。 android不允许在主线程上执行网络操作。因为它可能会冻结UI。

每当发生此异常 android.os.NetworkOnMainThreadException 时，表示您已在UI上执行了某些网络操作。

即使Service用于后台处理，它们也会在主线程中运行。

文档中的简短引用：

Caution: A services runs in the same process as the application in which 
it is declared and in the main thread of that application, by default. So, 
if your service performs intensive or blocking operations while the user 
interacts with an activity from the same application, the service will 
slow down activity performance. To avoid impacting application performance, 
you should start a new thread inside the service.