Android socket测试，只能发送硬编码字符串

Question

我正在尝试在我的应用程序和服务器之间设置套接字。我希望我的应用程序从EditText接收用户输入并将其发送到服务器。服务器工作正常。现在，我有一个变量String str，如果我硬编码str为“谁在那里？”，我的应用程序发送“谁在那里？”到服务器，服务器成功接收它。但是如果我尝试使用String str = et.getText（）。toString（）;它不会向我的服务器发送任何内容，无论其价值是多少。以下是我的适用代码。

activity_main.xml中

<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/textView1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="@string/hello_world" />

<Button
    android:id="@+id/myButton"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_centerHorizontal="true"
    android:layout_centerVertical="true"
    android:onClick="onClick"
    android:text="Send" />

<EditText
    android:id="@+id/editText1"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:layout_above="@+id/myButton"
    android:layout_alignLeft="@+id/textView1"
    android:ems="10"
    android:inputType="text"
    android:text="Who's there?" />

MainActivity.java

    package com.example.mytest;

    public class MainActivity extends Activity {


private Socket socket;

private static final int SERVERPORT = 5001;
private static final String SERVER_IP = "SERVER_ADDRESS (Assume this is correct)";


@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    new Thread(new ClientThread()).start();
}

public void onClick(View view) {
    try {


        TextView tv = (TextView) findViewById(R.id.textView1);

        //This is where the problem is!
        //EditText et = (EditText) findViewById(R.id.editText1);
        //String str = et.getText().toString();


        String str = "Who's there?";

        PrintWriter out = new PrintWriter(new BufferedWriter(
                new OutputStreamWriter(socket.getOutputStream())),
                true);
        BufferedReader in = new BufferedReader(
                new InputStreamReader(socket.getInputStream()));


        //Send "str" to server
        out.println(str);

        //Get string from server NOT WORKING EITHER
        String in_str = in.readLine();
        tv.setText(in_str);


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

class ClientThread implements Runnable {

    @Override
    public void run() {

        try {
            InetAddress serverAddr = InetAddress.getByName(SERVER_IP);

            socket = new Socket(serverAddr, SERVERPORT);

        } catch (UnknownHostException e1) {
            e1.printStackTrace();
        } catch (IOException e1) {
            e1.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;
}

    }

有什么想法吗？

谢谢。