應用程序在Android 2.2中正常工作，但意外關閉在4.2

該應用程序在Android 2.2中工作得很好。但在4.2應用程序意外關閉。該應用使用客戶端服務器體系結構將消息發送到充當服務器的筆記本電腦。的logcat的顯示：應用程序在Android 2.2中正常工作，但意外關閉在4.2

02-07 04:49:45.683: W/Trace(829): Unexpected value from nativeGetEnabledTags: 0 
02-07 04:49:45.683: W/Trace(829): Unexpected value from nativeGetEnabledTags: 0 
02-07 04:49:45.690: W/Trace(829): Unexpected value from nativeGetEnabledTags: 0 
02-07 04:49:46.160: W/Trace(829): Unexpected value from nativeGetEnabledTags: 0 
02-07 04:49:46.203: W/Trace(829): Unexpected value from nativeGetEnabledTags: 0 
02-07 04:49:47.803: W/Trace(829): Unexpected value from nativeGetEnabledTags: 0 
02-07 04:49:47.810: W/Trace(829): Unexpected value from nativeGetEnabledTags: 0 
02-07 04:49:48.000: W/Trace(829): Unexpected value from nativeGetEnabledTags: 0 
02-07 04:49:48.050: W/Trace(829): Unexpected value from nativeGetEnabledTags: 0 
02-07 04:49:48.182: W/Trace(829): Unexpected value from nativeGetEnabledTags: 0 
02-07 04:49:48.190: W/Trace(829): Unexpected value from nativeGetEnabledTags: 0 
02-07 04:49:48.262: W/Trace(829): Unexpected value from nativeGetEnabledTags: 0 
02-07 04:49:48.440: W/Trace(829): Unexpected value from nativeGetEnabledTags: 0 
02-07 04:49:48.440: W/Trace(829): Unexpected value from nativeGetEnabledTags: 0 
02-07 04:49:48.470: W/Trace(829): Unexpected value from nativeGetEnabledTags: 0 
02-07 04:49:48.480: W/Trace(829): Unexpected value from nativeGetEnabledTags: 0 
02-07 04:49:48.480: W/Trace(829): Unexpected value from nativeGetEnabledTags: 0 
02-07 04:49:48.500: W/Trace(829): Unexpected value from nativeGetEnabledTags: 0 
02-07 04:49:48.550: D/gralloc_goldfish(829): Emulator without GPU emulation detected. 
02-07 04:49:49.030: W/Trace(829): Unexpected value from nativeGetEnabledTags: 0 
02-07 04:49:49.060: W/Trace(829): Unexpected value from nativeGetEnabledTags: 0 
02-07 04:49:49.210: W/Trace(829): Unexpected value from nativeGetEnabledTags: 0 
02-07 04:49:49.210: W/Trace(829): Unexpected value from nativeGetEnabledTags: 0 
02-07 04:49:50.433: W/Trace(829): Unexpected value from nativeGetEnabledTags: 0 
02-07 04:49:50.433: W/Trace(829): Unexpected value from nativeGetEnabledTags: 0 
02-07 04:49:50.473: W/Trace(829): Unexpected value from nativeGetEnabledTags: 0 
02-07 04:49:50.473: W/Trace(829): Unexpected value from nativeGetEnabledTags: 0 
02-07 04:49:50.860: W/Trace(829): Unexpected value from nativeGetEnabledTags: 0 
02-07 04:49:50.860: W/Trace(829): Unexpected value from nativeGetEnabledTags: 0 
02-07 04:49:50.993: W/Trace(829): Unexpected value from nativeGetEnabledTags: 0 
02-07 04:49:50.993: W/Trace(829): Unexpected value from nativeGetEnabledTags: 0 
02-07 04:49:51.040: W/Trace(829): Unexpected value from nativeGetEnabledTags: 0 
02-07 04:49:51.040: W/Trace(829): Unexpected value from nativeGetEnabledTags: 0 
02-07 04:49:51.490: W/Trace(829): Unexpected value from nativeGetEnabledTags: 0 
02-07 04:49:51.490: W/Trace(829): Unexpected value from nativeGetEnabledTags: 0 
02-07 04:49:51.530: W/Trace(829): Unexpected value from nativeGetEnabledTags: 0 
02-07 04:49:51.530: W/Trace(829): Unexpected value from nativeGetEnabledTags: 0 
02-07 04:49:52.003: W/Trace(829): Unexpected value from nativeGetEnabledTags: 0 
02-07 04:49:52.003: W/Trace(829): Unexpected value from nativeGetEnabledTags: 0 
02-07 04:49:52.070: W/Trace(829): Unexpected value from nativeGetEnabledTags: 0 
02-07 04:49:52.070: W/Trace(829): Unexpected value from nativeGetEnabledTags: 0 
02-07 04:49:52.503: W/Trace(829): Unexpected value from nativeGetEnabledTags: 0 
02-07 04:49:52.503: W/Trace(829): Unexpected value from nativeGetEnabledTags: 0 
02-07 04:49:52.563: W/Trace(829): Unexpected value from nativeGetEnabledTags: 0 
02-07 04:49:52.563: W/Trace(829): Unexpected value from nativeGetEnabledTags: 0 
02-07 04:49:53.011: W/Trace(829): Unexpected value from nativeGetEnabledTags: 0 
02-07 04:49:53.011: W/Trace(829): Unexpected value from nativeGetEnabledTags: 0 
02-07 04:49:53.071: W/Trace(829): Unexpected value from nativeGetEnabledTags: 0 
02-07 04:49:53.071: W/Trace(829): Unexpected value from nativeGetEnabledTags: 0 
02-07 04:49:53.540: W/Trace(829): Unexpected value from nativeGetEnabledTags: 0 
02-07 04:49:53.540: W/Trace(829): Unexpected value from nativeGetEnabledTags: 0 
02-07 04:49:53.600: W/Trace(829): Unexpected value from nativeGetEnabledTags: 0 
02-07 04:49:53.600: W/Trace(829): Unexpected value from nativeGetEnabledTags: 0 
02-07 04:49:54.020: W/Trace(829): Unexpected value from nativeGetEnabledTags: 0 
02-07 04:49:54.020: W/Trace(829): Unexpected value from nativeGetEnabledTags: 0 
02-07 04:49:54.100: W/Trace(829): Unexpected value from nativeGetEnabledTags: 0 
02-07 04:49:54.100: W/Trace(829): Unexpected value from nativeGetEnabledTags: 0 
02-07 04:49:54.550: W/Trace(829): Unexpected value from nativeGetEnabledTags: 0 
02-07 04:49:54.570: W/Trace(829): Unexpected value from nativeGetEnabledTags: 0 
02-07 04:49:54.750: W/Trace(829): Unexpected value from nativeGetEnabledTags: 0 
02-07 04:49:54.750: W/Trace(829): Unexpected value from nativeGetEnabledTags: 0 
02-07 04:49:55.070: W/Trace(829): Unexpected value from nativeGetEnabledTags: 0 
02-07 04:50:20.590: D/dalvikvm(829): GC_CONCURRENT freed 193K, 11% free 2566K/2876K, paused 92ms+42ms, total 1402ms 
02-07 04:50:20.590: W/Trace(829): Unexpected value from nativeGetEnabledTags: 0 
02-07 04:50:20.610: W/Trace(829): Unexpected value from nativeGetEnabledTags: 0 
02-07 04:50:20.653: W/Trace(829): Unexpected value from nativeGetEnabledTags: 0 
02-07 04:50:20.660: W/Trace(829): Unexpected value from nativeGetEnabledTags: 0 
02-07 04:50:20.750: W/Trace(829): Unexpected value from nativeGetEnabledTags: 0 
02-07 04:50:20.750: W/Trace(829): Unexpected value from nativeGetEnabledTags: 0 
02-07 04:50:21.284: W/Trace(829): Unexpected value from nativeGetEnabledTags: 0 
02-07 04:50:21.290: W/Trace(829): Unexpected value from nativeGetEnabledTags: 0 
02-07 04:50:21.355: W/Trace(829): Unexpected value from nativeGetEnabledTags: 0 
02-07 04:50:21.360: W/Trace(829): Unexpected value from nativeGetEnabledTags: 0 
02-07 04:50:21.560: W/Trace(829): Unexpected value from nativeGetEnabledTags: 0 
02-07 04:50:21.560: W/Trace(829): Unexpected value from nativeGetEnabledTags: 0 
02-07 04:50:21.610: W/Trace(829): Unexpected value from nativeGetEnabledTags: 0 
02-07 04:50:21.768: W/Trace(829): Unexpected value from nativeGetEnabledTags: 0 
02-07 04:50:22.083: D/AndroidRuntime(829): Shutting down VM 
02-07 04:50:22.090: W/dalvikvm(829): threadid=1: thread exiting with uncaught exception (group=0x40a70930) 
02-07 04:50:22.190: E/AndroidRuntime(829): FATAL EXCEPTION: main 
02-07 04:50:22.190: E/AndroidRuntime(829): android.os.NetworkOnMainThreadException 
02-07 04:50:22.190: E/AndroidRuntime(829): at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1117) 
02-07 04:50:22.190: E/AndroidRuntime(829): at libcore.io.BlockGuardOs.connect(BlockGuardOs.java:84) 
02-07 04:50:22.190: E/AndroidRuntime(829): at libcore.io.IoBridge.connectErrno(IoBridge.java:127) 
02-07 04:50:22.190: E/AndroidRuntime(829): at libcore.io.IoBridge.connect(IoBridge.java:112) 
02-07 04:50:22.190: E/AndroidRuntime(829): at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:192) 
02-07 04:50:22.190: E/AndroidRuntime(829): at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172) 
02-07 04:50:22.190: E/AndroidRuntime(829): at java.net.Socket.startupSocket(Socket.java:566) 
02-07 04:50:22.190: E/AndroidRuntime(829): at java.net.Socket.tryAllAddresses(Socket.java:127) 
02-07 04:50:22.190: E/AndroidRuntime(829): at java.net.Socket.<init>(Socket.java:177) 
02-07 04:50:22.190: E/AndroidRuntime(829): at java.net.Socket.<init>(Socket.java:149) 
02-07 04:50:22.190: E/AndroidRuntime(829): at com.example.sample2.MainActivity$1.onClick(MainActivity.java:39) 
02-07 04:50:22.190: E/AndroidRuntime(829): at  android.view.View.performClick(View.java:4202) 
02-07 04:50:22.190: E/AndroidRuntime(829): at android.view.View$PerformClick.run(View.java:17340) 
02-07 04:50:22.190: E/AndroidRuntime(829): at android.os.Handler.handleCallback(Handler.java:725) 
02-07 04:50:22.190: E/AndroidRuntime(829): at android.os.Handler.dispatchMessage(Handler.java:92) 
02-07 04:50:22.190: E/AndroidRuntime(829): at android.os.Looper.loop(Looper.java:137) 
02-07 04:50:22.190: E/AndroidRuntime(829): at android.app.ActivityThread.main(ActivityThread.java:5039) 
02-07 04:50:22.190: E/AndroidRuntime(829): at java.lang.reflect.Method.invokeNative(Native Method) 
02-07 04:50:22.190: E/AndroidRuntime(829): at java.lang.reflect.Method.invoke(Method.java:511) 
02-07 04:50:22.190: E/AndroidRuntime(829): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793) 
02-07 04:50:22.190: E/AndroidRuntime(829): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560) 
02-07 04:50:22.190: E/AndroidRuntime(829): at dalvik.system.NativeStart.main(Native Method) 
02-07 04:50:30.530: I/Process(829): Sending signal. PID: 829 SIG: 9

我的客戶端代碼

public class MainActivity extends Activity { 

private Socket client; 
private PrintWriter printwriter; 
private EditText textField; 
private Button button; 
private String messsage; 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 
    textField = (EditText) findViewById(R.id.editText1); 
    button = (Button) findViewById(R.id.button1); 
    button.setOnClickListener(new View.OnClickListener() { 

     @Override 
     public void onClick(View v) { 
      // TODO Auto-generated method stub 
      messsage = textField.getText().toString(); 
      textField.setText("");  
      try { 

       client = new Socket("10.0.2.2", 4444); 
       printwriter = new PrintWriter(client.getOutputStream(),true); 
       printwriter.write(messsage); 
       printwriter.flush(); 
       printwriter.close(); 
       client.close(); 
       } catch (UnknownHostException e) { 
       e.printStackTrace(); 
       } catch (IOException e) { 
       e.printStackTrace(); 
       } 

     } 
    }); 
} 

@Override 
public boolean onCreateOptionsMenu(Menu menu) { 
    // Inflate the menu; this adds items to the action bar if it is present. 
    getMenuInflater().inflate(R.menu.activity_main, menu); 
    return true; 
} 

}

請幫我解決這個問題。

來源

2013-02-06 user2048724

'NetworkOnMainThreadException'，堆棧跟蹤說明了一切。 [更多信息]（http://www.androiddesignpatterns.com/2012/06/app-force-close-honeycomb-ics.html）。 –

它在老版本的Android上工作正常，因爲舊版本的框架代碼永遠不會檢查這種情況。 –

顯然。我知道例外情況並不總是可以理解的，但是這個說明了一切。把你的服務器的網絡通信放在一個單獨的線程中（例如AsyncTask ..） – psykhi