使用surfaceView

在那本书用的是GameCanvas，我就用surfaceView实现了和实例2相同的效果

效果图:

 

下面给出MainView 的代码

Java代码

package com.wjh.demon_3;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.view.KeyEvent;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.SurfaceHolder.Callback;

public class MainView extends SurfaceView implements Callback,Runnable{
    int keyCode = 0;
    String keyAction = "";
    Thread gameThread = null;
    boolean isGame = true;
    SurfaceHolder holder = null;
    public MainView(Context context) {
        super(context);
        // TODO Auto-generated constructor stub
        setFocusable(true);
        getHolder().addCallback(this);
        holder = this.getHolder();
    }
    @Override
    public void run() {
        // TODO Auto-generated method stub
        while(isGame)
        {
            input();
            logic();
            doDraw();
            try {
                Thread.sleep(100);
            } catch (InterruptedException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }       
        }
    }
    //开始游戏主线程
    public void start()
    {
        if(gameThread == null)
        {
        gameThread = new Thread(this);
        gameThread.start();
        }
    }
    //停止游戏主线程
    public void stop()
    {
        isGame = false;
        if(gameThread != null)
        {
            try {
                gameThread.join();
            } catch (InterruptedException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
    }
    //输入判断
    public void input()
    {
    }
    //逻辑判断
    public void logic()
    {
    }
    public void doDraw()
    {
        Canvas c = null;
        try
        {
        c = holder.lockCanvas();
        synchronized (holder) {
            paint(c);
        }
        }finally{
            if(c != null)
            {
            holder.unlockCanvasAndPost(c);
            }
        }
    }
    //画图
    public void paint(Canvas canvas)
    {
        Paint backGround = new Paint();
        backGround.setColor(Color.BLACK);
        //清屏
        canvas.drawRect(0, 0, getWidth(), getHeight(), backGround);
        //设置画笔颜色
        Paint cPaint = new Paint();
        cPaint.setColor(Color.BLUE);
        cPaint.setTextSize(20);
        //输出按键的设备码
        canvas.drawText("KeyCode:", 10, 20,cPaint);
        canvas.drawText(""+keyCode,120,20,cPaint);
        //输出按键的设备名
        canvas.drawText("KeyAction:", 10, 80, cPaint);
        canvas.drawText(keyAction, 120, 80, cPaint);
    }
    @Override
    public void surfaceChanged(SurfaceHolder holder, int format, int width,
            int height) {
        // TODO Auto-generated method stub
    }
    @Override
    public void surfaceCreated(SurfaceHolder holder) {
        // TODO Auto-generated method stub
        start();
    }
    @Override
    public void surfaceDestroyed(SurfaceHolder holder) {
        // TODO Auto-generated method stub
        stop();
    }
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        // TODO Auto-generated method stub
        this.keyCode = keyCode;
        switch(keyCode)
        {
        case KeyEvent.KEYCODE_DPAD_UP:
            this.keyAction = "UP";
            break;
        case KeyEvent.KEYCODE_DPAD_DOWN:
            this.keyAction = "DOWN";
            break;
        case KeyEvent.KEYCODE_DPAD_LEFT:
            this.keyAction = "LEFT";
            break;
        case KeyEvent.KEYCODE_DPAD_RIGHT:
            this.keyAction = "RIGHT";
            break;
        case KeyEvent.KEYCODE_DPAD_CENTER:
            this.keyAction = "CENTER";
            break;       
        default:
            this.keyAction="NONE";
            break;
        }
        return super.onKeyDown(keyCode, event);
    }

}