Android studio socket客户端应用设计

一、XML布局设计：

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <TextView
        android:id="@+id/textView3"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="64dp"
        android:layout_marginTop="32dp"
        android:gravity="center"
        android:text="IP地址："
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        tools:ignore="MissingConstraints" />

    <TextView
        android:id="@+id/textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="30dp"
        android:gravity="center"
        android:text="端口号："
        app:layout_constraintEnd_toEndOf="@+id/textView3"
        app:layout_constraintTop_toBottomOf="@+id/textView3" />

    <TextView
        android:id="@+id/textView2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="30dp"
        android:gravity="center"
        android:text="发送数据："
        app:layout_constraintEnd_toEndOf="@+id/textView"
        app:layout_constraintTop_toBottomOf="@+id/textView" />

    <EditText
        android:id="@+id/editTextTextPostalAddress"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="8dp"
        android:ems="10"
        android:gravity="center"
        android:inputType="textPostalAddress"
        android:text="192.168.8.140"
        app:layout_constraintBottom_toBottomOf="@+id/textView3"
        app:layout_constraintStart_toEndOf="@+id/textView3"
        app:layout_constraintTop_toTopOf="@+id/textView3"
        tools:ignore="MissingConstraints" />

    <EditText
        android:id="@+id/editTextTextPostalAddress2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="5dp"
        android:ems="10"
        android:gravity="center"
        android:inputType="textPostalAddress"
        android:text="5050"
        app:layout_constraintBottom_toBottomOf="@+id/textView"
        app:layout_constraintStart_toStartOf="@+id/editTextTextPostalAddress"
        app:layout_constraintTop_toTopOf="@+id/textView" />

    <EditText
        android:id="@+id/editTextTextPostalAddress3"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="6dp"
        android:ems="10"
        android:gravity="center"
        android:inputType="textPostalAddress"
        android:text="Hello!"
        app:layout_constraintBottom_toBottomOf="@+id/textView2"
        app:layout_constraintStart_toStartOf="@+id/editTextTextPostalAddress2"
        app:layout_constraintTop_toTopOf="@+id/textView2" />

    <Button
        android:id="@+id/button"
        android:layout_width="161dp"
        android:layout_height="50dp"
        android:layout_marginStart="16dp"
        android:layout_marginTop="16dp"
        android:layout_marginEnd="16dp"
        android:onClick="link"
        android:text="连接服务器"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toEndOf="@+id/button2"
        app:layout_constraintTop_toBottomOf="@+id/editTextTextPersonName" />

    <Button
        android:id="@+id/button2"
        android:layout_width="147dp"
        android:layout_height="50dp"
        android:layout_marginStart="16dp"
        android:layout_marginEnd="16dp"
        android:onClick="transmitter"
        android:text="发送数据"
        app:layout_constraintEnd_toStartOf="@+id/button"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="@+id/button" />

    <TextView
        android:id="@+id/textView4"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="30dp"
        android:text="接收数据："
        android:gravity="center"
        app:layout_constraintEnd_toEndOf="@+id/textView2"
        app:layout_constraintTop_toBottomOf="@+id/textView2" />

    <EditText
        android:id="@+id/editTextTextPersonName"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="6dp"
        android:ems="10"
        android:inputType="textPersonName"
        android:text=""
        android:gravity="center"
        app:layout_constraintBottom_toBottomOf="@+id/textView4"
        app:layout_constraintStart_toStartOf="@+id/editTextTextPostalAddress3"
        app:layout_constraintTop_toTopOf="@+id/textView4" />


</androidx.constraintlayout.widget.ConstraintLayout>

二、增加wifi权限：

<uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>
<uses-permission android:name="android.permission.INTERNET"/>

三、MainActivity.java部分代码：

1）、连接服务器按钮onClick事件：

public void link(View view) {
    if (btn1.getText().equals("连接服务器")) {
        ConnectThread connectthread = new ConnectThread();
        connectthread.start();
        btn1.setText("断开服务器");
    } else if (btn1.getText().equals("断开服务器")) {
        btn1.setText("连接服务器");
        try {
            socket.close();
            socket = null;
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

2）、socket连接thread：

class ConnectThread extends Thread {
        public void run() {
            InetAddress ipAddress;
            try {
                if (socket == null) {
                    ipAddress = InetAddress.getByName(ipEt.getText().toString());
                    int port = Integer.valueOf(portEt.getText().toString());
                    socket = new Socket(ipAddress, port);

                    inputStream = socket.getInputStream();
                    outputStream = socket.getOutputStream();

                    ReadDataThread readDataThread = new ReadDataThread();
                    readDataThread.start();
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }

3）、发送数据thread：

class SendDataThread extends Thread {
    public void run() {
        try {
            outputStream.write(txDataEt.getText().toString().getBytes());
            btn2.setText("发送完成");
            Thread.sleep(1000);
            btn2.setText("发送数据");
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

4）、接收数据thread：