android socket wifi 連接PC實現簡單的PPT控制器（源碼）

以上是手機端簡單的運行效果圖

通過本文只是想來簡單介紹一下關於android socket編程。

向上服務器端代碼：

package nate.PPT.control;
import java.awt.AWTException;
import java.awt.Robot;
import java.awt.event.KeyEvent;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.net.ServerSocket;
import java.net.Socket;



public class PPTServer {
	private final static int RIGHT = 1;
	private final static int LEFT = 2;
	private final static int SHIFTF5 = 0;
	private final static int ESC = 3;
	
	private static int key;
	//注意這裡用的輸入輸出流的對象
	private static ObjectInputStream fromClient;
	private static ObjectOutputStream fromServer;
	
	public static void main(String[] args) throws IOException,
									ClassNotFoundException, AWTException, InterruptedException{
		ServerSocket sSocket = new ServerSocket(2011);
		System.out.println("waiting a connection from the client");
		Robot robot = new Robot();		
		Socket sock = sSocket.accept();
		System.out.println("recv a connection");
		fromClient = new ObjectInputStream(sock.getInputStream());
		fromServer = new ObjectOutputStream(sock.getOutputStream());
		do{
			Choices choice = (Choices)fromClient.readObject();
			System.out.println("the flag is " + choice.getKey());
			key = choice.getKey();
			switch(key){
			
			case SHIFTF5:
				robot.keyPress(KeyEvent.VK_SHIFT);
				Thread.sleep(20);
				robot.keyPress(KeyEvent.VK_F5);
				Thread.sleep(10);
				robot.keyRelease(KeyEvent.VK_F5);
				robot.keyRelease(KeyEvent.VK_SHIFT);
				Thread.sleep(10);
				break;
				
			case LEFT:
				robot.keyPress(KeyEvent.VK_LEFT);
				Thread.sleep(10);
				robot.keyRelease(KeyEvent.VK_LEFT);
				Thread.sleep(10);
				break;
				
			case RIGHT:
				robot.keyPress(KeyEvent.VK_RIGHT);
				Thread.sleep(10);
				robot.keyRelease(KeyEvent.VK_RIGHT);
				Thread.sleep(10);
				break;
				
			case ESC:
				robot.keyPress(KeyEvent.VK_ESCAPE);
				Thread.sleep(10);
				robot.keyPress(KeyEvent.VK_ESCAPE);
				Thread.sleep(10);
				break;
				
				default:
					break;
			}
		}while(key != -1);
		System.out.println("exit the app");
		fromClient.close();
		fromServer.close();
		sock.close();
		sSocket.close();
	}
}

本例中，注意一下所用的輸入輸出流對象，關於這個java中已經很清楚了，就不多說。同時，本例中使用java中的Robot來模擬按鍵，即PPT中的快捷鍵從而實現控制PPT的目的。當然，大家都知道，使用ObjectInputStream、ObjectOutputStream傳輸對象首先還需下面的條件。即傳送的對象所屬的類，該類必須實現Serializable接口！同時注意在android手機客戶端，我們需要同樣擁有這樣一個類型！！！將此類copy過去即可，這些都是java中的知識。

package nate.PPT.control;

import java.io.Serializable;

public class Choices implements Serializable{
	
	private int key;

	public Choices(int key) {
		super();
		this.key = key;
	}

	public int getKey() {
		return key;
	}

	public void setKey(int key) {
		this.key = key;
	}
	
}

　　

上面類包含了傳輸的信息數據內容。

來看看client端的代碼，部署在android手機端：

package nate.PPT.control;

import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.net.InetAddress;
import java.net.Socket;
import java.net.UnknownHostException;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.View;
import android.widget.Button;

public class PPTClient extends Activity {
	private Button start;
	private Button escape;
	private Button forward;
	private Button back;
	private Socket sock;
	private ObjectOutputStream fromClient;
	private ObjectInputStream fromServer;
	private final static int RIGHT = 1;
	private final static int LEFT = 2;
	private final static int SHIFTF5 = 0;
	private final static int ESC = 3;
	
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        try {
			//sock = new Socket(InetAddress.getByName("125.71.69.199"),2011);
        	sock = new Socket(InetAddress.getByName("125.70.223.165"),2011);
        	fromClient = new ObjectOutputStream(sock.getOutputStream());
			fromServer = new ObjectInputStream(sock.getInputStream());
			
			} catch (UnknownHostException e1) {
			e1.printStackTrace();
		} catch (IOException e1) {
			e1.printStackTrace();
		}
        
        start = (Button)this.findViewById(R.id.start);
        escape = (Button)this.findViewById(R.id.escape);
        forward = (Button)this.findViewById(R.id.froward);
        back = (Button)this.findViewById(R.id.back);
        
        start.setOnClickListener(new Button.OnClickListener(){

			@Override
			public void onClick(View v) {
				Choices choice = new Choices(SHIFTF5);
				try {
					fromClient.writeObject(choice);
					System.out.println("send the start shift + f5");
				} catch (IOException e) {
					e.printStackTrace();
				}
			}
        	
        });
        
        escape.setOnClickListener(new Button.OnClickListener(){

			@Override
			public void onClick(View arg0) {
				Choices  choice = new Choices(ESC);
				try {
					fromClient.writeObject(choice);
					System.out.println("send the escape");
				} catch (IOException e) {
					e.printStackTrace();
				}
			}
        });
        forward.setOnClickListener(new Button.OnClickListener(){

			@Override
			public void onClick(View v) {
				Choices choice = new Choices(RIGHT);
				try {
					fromClient.writeObject(choice);
					System.out.println("send the right (the next)");
				} catch (IOException e) {
					e.printStackTrace();
				}
				
			}
        	
        });
        back.setOnClickListener(new Button.OnClickListener(){

			@Override
			public void onClick(View v) {
				Choices choice = new Choices(LEFT);
				try {
					fromClient.writeObject(choice);
					System.out.println("send the left (the last)");
				} catch (IOException e) {
					e.printStackTrace();
				}
			}
        });
    }
    
    /**
     * 監聽BACK鍵
     * @param keyCode
     * @param event
     * @return
     */
    public boolean onKeyDown(int keyCode, KeyEvent event) 
    {	
		if ( event.getKeyCode() == KeyEvent.KEYCODE_BACK){
			AlertDialog.Builder builder = new AlertDialog.Builder(this);
			builder.setTitle("exit app");
			builder.setMessage("You will exit the app...");
			//builder.setIcon(R.drawable.stat_sys_warning);
			builder.setPositiveButton("OK",new DialogInterface.OnClickListener() {
				@Override
				public void onClick(DialogInterface dialog, int which) {
					Intent startMain = new Intent(Intent.ACTION_MAIN);
					startMain.addCategory(Intent.CATEGORY_HOME); 
					startMain.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK); 
					startActivity(startMain);
					System.exit(0);
				}
			});
			builder.setNegativeButton("Cancel",new DialogInterface.OnClickListener() {
				
				@Override
				public void onClick(DialogInterface dialog, int which) {
					
				}
			});
			builder.show();
		}
		return super.onKeyDown(keyCode, event);
	}
}

代碼還是很簡單的，這裡不多說了，強調一下的是，client端除了一個activity的類外，還有上面的Choices類！！！與服務器端的類型一模一樣！同時，別忘記了需要在android manifest.XML文件中添加

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

用戶權限！！！別忘記添加。。。
當然，代碼還有很多需要改進的地方，比如要解決按下可能延遲PPT沒有反應，但是又不知道是否真的按下等問題，我們可以在手機端的按鈕上加上一個震動的效果，這樣我們就能准確的知道我們是否按下手機上的按鍵。這個應該不難吧！不過本篇文章主要還是簡單介紹android socket編程與PC的連接。