Android通過套接字發送數據

Question

我想通過tcp發送一個簡單的日期。我與線程工作，但我不知道爲什麼，但是當我嘗試運行我的代碼停止imediatelly在這裏。我已經設置了許可。

我做錯了什麼？我真的初學者所以請幫我

package com.example.teszt; 

import java.util.Date; 

import java.io.IOException; 
import java.io.OutputStream; 
import java.io.PrintWriter; 
import java.net.Socket; 
import java.net.UnknownHostException; 

import android.os.Bundle; 
import android.app.Activity; 
import android.view.Menu; 
import android.view.View; 
import android.widget.EditText; 
import android.widget.TextView; 


public class MainActivity extends Activity { 

    TextView date; 
    EditText textout; 
    TextView textin; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 
     date=(TextView)findViewById(R.id.Text1); 


     ////////////////////////////////////////////////////////////////////////// 

    } 

    public void showNewDate(View v) 
    { 
     date.setText(new Date().toString()); 
    } 

    @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; 
    } 

/////////////////////////////////////////////////////////////////////////////////// 




    public void send_socket(View arg0) 
    { 


     Thread thread = new Thread(new Runnable() { 
      public void run() { 
     try { 


     Socket socket = new Socket("10.38.248.121", 2101); 
     OutputStream out = socket.getOutputStream(); 
     PrintWriter output = new PrintWriter(out);   

     output.println("Hello from Android");    
     date.setText(new Date().toString());  

     out.flush(); 
     out.close(); 

     socket.close();          


      } 
     catch (UnknownHostException e) {e.printStackTrace();} 
     catch (IOException e) { e.printStackTrace();} 


      } 
     }); thread.start(); 

    } 


} 

這是XML：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:tools="http://schemas.android.com/tools" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:paddingBottom="@dimen/activity_vertical_margin" 
    android:paddingLeft="@dimen/activity_horizontal_margin" 
    android:paddingRight="@dimen/activity_horizontal_margin" 
    android:paddingTop="@dimen/activity_vertical_margin" 
    tools:context=".MainActivity" > 

    <TextView 
     android:id="@+id/Text1" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_alignBaseline="@+id/button1" 
     android:layout_alignBottom="@+id/button1" 
     android:layout_alignParentLeft="true" 
     android:layout_marginLeft="133dp" 
     android:text="Katt" 
     tools:ignore="HardcodedText" /> 

    <Button 
     android:id="@+id/button1" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_alignParentLeft="true" 
     android:layout_alignParentTop="true" 
     android:layout_marginLeft="32dp" 
     android:layout_marginTop="40dp" 
     android:onClick="showNewDate" 
     android:text="Dátum" 
     tools:ignore="HardcodedText" /> 

    <Button 
     android:id="@+id/button2" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_alignLeft="@+id/button1" 
     android:layout_below="@+id/button1" 
     android:layout_marginTop="26dp" 
     android:onClick="send_socket" 
     android:text="Send" 
     tools:ignore="HardcodedText" /> 



</RelativeLayout> 

Answer 1

只能從主線程UI交互。您不容做

date.setText(new Date().toString());