Android Socket客户端自行关闭[重复]答案

【问题标题】：Android Socket Client closes itself [duplicate]Android Socket客户端自行关闭[重复]
【发布时间】：2012-12-28 21:19:56
【问题描述】：

可能重复：
android.os.NetworkOnMainThreadException
Android Socket Client didn’t send and closes itself

我是 java 和 android 编程的新手，我正在尝试为我的电脑（windows 7）编写一个 Android 客户端和服务器。通过这个连接，我想将一个字符串从 pc 发送到 android 应用程序，也从应用程序发送到 pc。我检查了我的服务器，它是否编程正确。所以我的客户一定有一个错误。当我启动应用程序时。该应用程序启动，但是当我想从我的应用程序向电脑发送一个字符串时，该应用程序会自行关闭。现在我确实需要你的帮助。我已经在应用程序上编程超过 2 天了。

这是我的 LogCat，我真的希望你能告诉我在哪里可以找到我的错误。

12-28 21:10:29.348: I/dalvikvm(565): threadid=3: reacting to signal 3

12-28 21:10:29.428: I/dalvikvm(565): Wrote stack traces to '/data/anr/traces.txt'

12-28 21:10:29.818: I/dalvikvm(565): threadid=3: reacting to signal 3

12-28 21:10:29.888: I/dalvikvm(565): Wrote stack traces to '/data/anr/traces.txt'

12-28 21:10:30.258: D/gralloc_goldfish(565): Emulator without GPU emulation detected.

12-28 21:10:30.319: I/dalvikvm(565): threadid=3: reacting to signal 3

12-28 21:10:30.348: I/dalvikvm(565): Wrote stack traces to '/data/anr/traces.txt'

12-28 21:11:12.498: D/AndroidRuntime(565): Shutting down VM

12-28 21:11:12.508: W/dalvikvm(565): threadid=1: thread exiting with uncaught exception 
(group=0x409c01f8)

12-28 21:11:12.540: E/AndroidRuntime(565): FATAL EXCEPTION: main

12-28 21:11:12.540: E/AndroidRuntime(565): android.os.NetworkOnMainThreadException

12-28 21:11:12.540: E/AndroidRuntime(565):  at 
android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1099)

12-28 21:11:12.540: E/AndroidRuntime(565):  at 
libcore.io.BlockGuardOs.connect(BlockGuardOs.java:84)

12-28 21:11:12.540: E/AndroidRuntime(565):  at 
libcore.io.IoBridge.connectErrno(IoBridge.java:127)

12-28 21:11:12.540: E/AndroidRuntime(565):  at 
libcore.io.IoBridge.connect(IoBridge.java:112)

12-28 21:11:12.540: E/AndroidRuntime(565):  at 
java.net.PlainSocketImpl.connect(PlainSocketImpl.java:192)

12-28 21:11:12.540: E/AndroidRuntime(565):  at 
java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172)

12-28 21:11:12.540: E/AndroidRuntime(565):  at 
java.net.Socket.startupSocket(Socket.java:566)

12-28 21:11:12.540: E/AndroidRuntime(565):  at 
java.net.Socket.tryAllAddresses(Socket.java:127)

12-28 21:11:12.540: E/AndroidRuntime(565):  at java.net.Socket.<init>(Socket.java:177)

12-28 21:11:12.540: E/AndroidRuntime(565):  at java.net.Socket.<init>(Socket.java:149)

12-28 21:11:12.540: E/AndroidRuntime(565):  at 
net.ibasic.AndroidClient$1.onClick(AndroidClient.java:50)

12-28 21:11:12.540: E/AndroidRuntime(565):  at 
android.view.View.performClick(View.java:3511)

12-28 21:11:12.540: E/AndroidRuntime(565):  at 
android.view.View$PerformClick.run(View.java:14105)

12-28 21:11:12.540: E/AndroidRuntime(565):  at 
android.os.Handler.handleCallback(Handler.java:605)

12-28 21:11:12.540: E/AndroidRuntime(565):  at 
android.os.Handler.dispatchMessage(Handler.java:92)

12-28 21:11:12.540: E/AndroidRuntime(565):  at android.os.Looper.loop(Looper.java:137)

12-28 21:11:12.540: E/AndroidRuntime(565):  at 
android.app.ActivityThread.main(ActivityThread.java:4424)

12-28 21:11:12.540: E/AndroidRuntime(565):  at 
java.lang.reflect.Method.invokeNative(Native Method)

12-28 21:11:12.540: E/AndroidRuntime(565):  at 
java.lang.reflect.Method.invoke(Method.java:511)

12-28 21:11:12.540: E/AndroidRuntime(565):  at 
com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)

12-28 21:11:12.540: E/AndroidRuntime(565):  at 
com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)

12-28 21:11:12.540: E/AndroidRuntime(565):  at dalvik.system.NativeStart.main(Native 
Method)

12-28 21:11:13.178: I/dalvikvm(565): threadid=3: reacting to signal 3

12-28 21:11:13.218: I/dalvikvm(565): Wrote stack traces to '/data/anr/traces.txt'

12-28 21:11:15.288: I/Process(565): Sending signal. PID: 565 SIG: 9

【问题讨论】：

鉴于堆栈跟踪中的此异常android.os.NetworkOnMainThreadException 我希望您在主线程中执行网络活动，而 Android 似乎不喜欢。搜索异常情况，您一定会发现很多人犯了同样的错误以及他们是如何解决的。
好的。谢谢你。我会查找这个。

标签： android sockets client logcat

【解决方案1】：

听起来您可能正在主 UI 中做网络工作，而不是像 AsyncTask 这样的背景这是一个如何设置的基本示例

public class MyNetworkTask extends AsyncTask<String, String, String> {
@Override
protected void onPreExecute() {
    super.onPreExecute();
}

@Override
protected void onProgressUpdate(String... values) {
    super.onProgressUpdate(values);

}

@Override
protected String doInBackground(String... params) {
//do your work here
    return something;
}

@Override
protected void onPostExecute(String result) {
    super.onPostExecute(result);
       // do something with data here-display it or send to mainactivity

}

这里是它的文档链接： http://developer.android.com/reference/android/os/AsyncTask.html

【讨论】：