在局域網中的Android上的UDP客戶端

Question

我有一個客戶端類，其中包含編輯文本，輸入的文本將通過局域網發送到特定主機，局域網的IP定義爲按下按鈕。但它不工作，停止。請幫幫我。 我的客戶端類是：

public class MainActivity extends Activity { 
EditText et1; 
    Button bt1; 
    InetAddress IPAddress; 
    DatagramPacket dp; 
    String message; 
    int SERVERPORT = 11111; 
     String SERVER_IP = "192.168.1.101"; 
    DatagramSocket clientSocket; 
@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 

    et1=(EditText)findViewById(R.id.EditText01); 
    bt1=(Button)findViewById(R.id.myButton); 
    message=et1.getText().toString(); 
     try { 


     clientSocket = new DatagramSocket(); 


    } catch (SocketException e1) { 
     // TODO Auto-generated catch block 
     e1.printStackTrace(); 
    }  
     try { 


     IPAddress = InetAddress.getByName(SERVER_IP); 


    } catch (UnknownHostException e) { 
     // TODO Auto-generated catch block 
     e.printStackTrace(); 
    } 


     byte[] sendData = message.getBytes(); 

    dp = new DatagramPacket(sendData, sendData.length, IPAddress, SERVERPORT); 


    bt1.setOnClickListener(new View.OnClickListener() { 

     @Override 
     public void onClick(View v) { 
      // TODO Auto-generated method stub 



       try { 



       clientSocket.send(dp); 



      } catch (IOException e) { 
       // TODO Auto-generated catch block 
       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.main, menu); 
    return true; 
} 

     } 

日誌貓：

08-27 07:04:52.967: D/gralloc_goldfish(531): Emulator without GPU emulation detected. 
    08-27 07:05:03.018: D/AndroidRuntime(531): Shutting down VM 
08-27 07:05:03.018: W/dalvikvm(531): threadid=1: thread exiting with uncaught exception (group=0x409961f8) 
    08-27 07:05:03.048: E/AndroidRuntime(531): FATAL EXCEPTION: main 
    08-27 07:05:03.048: E/AndroidRuntime(531): android.os.NetworkOnMainThreadException 
    08-27 07:05:03.048: E/AndroidRuntime(531): at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1084) 
    08-27 07:05:03.048: E/AndroidRuntime(531):  at libcore.io.BlockGuardOs.sendto(BlockGuardOs.java:163) 
     08-27 07:05:03.048: E/AndroidRuntime(531): at libcore.io.IoBridge.sendto(IoBridge.java:463) 
08-27 07:05:03.048: E/AndroidRuntime(531):  at java.net.PlainDatagramSocketImpl.send(PlainDatagramSocketImpl.java:182) 
    08-27 07:05:03.048: E/AndroidRuntime(531): at java.net.DatagramSocket.send(DatagramSocket.java:287) 
    08-27 07:05:03.048: E/AndroidRuntime(531): at com.example.alastclient.MainActivity$1.onClick(MainActivity.java:73) 
    08-27 07:05:03.048: E/AndroidRuntime(531): at android.view.View.performClick(View.java:3480) 
    08-27 07:05:03.048: E/AndroidRuntime(531): at android.view.View$PerformClick.run(View.java:13983) 
    08-27 07:05:03.048: E/AndroidRuntime(531): at android.os.Handler.handleCallback(Handler.java:605) 
    08-27 07:05:03.048: E/AndroidRuntime(531):  at android.os.Handler.dispatchMessage(Handler.java:92) 
    08-27 07:05:03.048: E/AndroidRuntime(531): at android.os.Looper.loop(Looper.java:137) 
    08-27 07:05:03.048: E/AndroidRuntime(531): at android.app.ActivityThread.main(ActivityThread.java:4340) 
08-27 07:05:03.048: E/AndroidRuntime(531):  at java.lang.reflect.Method.invokeNative(Native Method) 
    08-27 07:05:03.048: E/AndroidRuntime(531): at java.lang.reflect.Method.invoke(Method.java:511) 
    08-27 07:05:03.048: E/AndroidRuntime(531): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784) 
    08-27 07:05:03.048: E/AndroidRuntime(531): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551) 
08-27 07:05:03.048: E/AndroidRuntime(531): at dalvik.system.NativeStart.main(Native Method) 

Answer 1

您的客戶端應該包含在網絡上發送數據包的新線程，在現有的類，你正在使用的主線程爲了通過網絡發送udp數據包，我認爲這是不可行的，您必須在按下按鈕時創建一個新線程，請參閱android文檔以瞭解可運行和線程。