APP之socket客户端

实现按下不同按键，往服务器发送不同消息

页面xml部分

<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" >

    <Button
        android:id="@+id/back"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/fh"
        android:layout_centerVertical="true"
        android:onClick="sendMessage"
        android:text="后退" />

    <Button
        android:id="@+id/turnRight"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_alignParentLeft="true"
        android:layout_marginBottom="65dp"
        android:layout_marginLeft="27dp"
        android:onClick="sendMessage"
        android:text="右转" />

    <Button
        android:id="@+id/fh"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_above="@+id/back"
        android:layout_alignLeft="@+id/turnRight"
        android:layout_marginBottom="68dp"
        android:layout_marginLeft="34dp"
        android:onClick="sendMessage"
        android:text="前进" />

    <Button
        android:id="@+id/turnLeft"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_above="@+id/back"
        android:layout_toLeftOf="@+id/back"
        android:onClick="sendMessage"
        android:text="左转" />

</RelativeLayout>

Java部分

NetUtils.java

• 创建一个函数，用来开线程来发送数据
• 必须要在线程里进行网络访问，不然会有异常

package com.example.socket.dzz.nets;

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

public class NetUtils {
	public static void sendMessageHandler(final String command){
    	new Thread(new Runnable() {
			@Override
			public void run() {
				// TODO Auto-generated method stub
				try {
					Socket client = new Socket("192.168.1.103", 8800);
					OutputStream out = client.getOutputStream();  //发送数据的通道
					out.write(command.getBytes());  // 发送通道，发送数据
					
				}catch (IOException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
			}
		}).start();
    	
    }
}

MainActivity.java

package com.example.socket.dzz;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.Socket;
import java.util.Scanner;

import com.example.socket.dzz.nets.NetUtils;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;

public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }
    public void sendMessage(View v){
    	switch(v.getId()){
    		case R.id.fh:
    			NetUtils.sendMessageHandler("gofoward");
    			break;
    		case R.id.back:
    			NetUtils.sendMessageHandler("goback");
    			break;
    		case R.id.turnLeft:
    			NetUtils.sendMessageHandler("goLeft");
    			break;
    		case R.id.turnRight:
    			NetUtils.sendMessageHandler("goRight");
    			break;
    	}
    	
    }
    
}