android学习日记06--游戏开发之SurfaceView框架

  1 package com.example.gamesurfaceview2;
  2 
  3 import android.content.Context;
  4 import android.graphics.Canvas;
  5 import android.graphics.Color;
  6 import android.graphics.Paint;
  7 import android.view.MotionEvent;
  8 import android.view.SurfaceHolder;
  9 import android.view.SurfaceHolder.Callback;
 10 import android.view.SurfaceView;
 11 
 12 //SurfaceView 还要继承CallBack接口
 13 public class MySurfaceView extends SurfaceView implements Callback,Runnable{
 14 
 15     private SurfaceHolder sfh;
 16     private Paint paint;
 17     private int x,y;
 18     private Thread thread;
 19     private boolean flag;
 20     private Canvas canvas;
 21     private int w,h;
 22     
 23     public MySurfaceView(Context context) {
 24         super(context);
 25         // TODO Auto-generated constructor stub
 26         //通过SurfaceHolder来和Can打交道
 27         sfh = this.getHolder();
 28         //添加监听
 29         sfh.addCallback(this);
 30         x =20;
 31         y =20;
 32         paint = new Paint();
 33         paint.setColor(Color.WHITE);
 34         setFocusable(true);
 35     }
 36 
 37     @Override
 38     /**
 39      * surfaceView发生改变时执行的方法
 40      */
 41     public void surfaceChanged(SurfaceHolder holder, int format, int width,
 42             int height) {
 43         // TODO Auto-generated method stub
 44         
 45     }
 46     
 47     @Override
 48     /**
 49      * surfaceView创建时执行的方法
 50      */
 51     public void surfaceCreated(SurfaceHolder holder) {
 52         // TODO Auto-generated method stub
 53         h = this.getHeight();
 54         w = this.getWidth();
 55         flag = true;
 56         thread = new Thread(this);
 57         thread.start();
 58     }
 59     
 60     /**
 61      * 自己定义的绘画调用方法
 62      */
 63     private void Mydraw() {
 64         try {
 65             // 获取一个加锁的画布，防止被其他修改
 66             canvas = sfh.lockCanvas();
 67             if (canvas != null) {
 68                 //-----------利用填充矩形的方式，刷屏
 69                 ////绘制矩形
 70                 //canvas.drawRect(0,0,this.getWidth(),
 71                 //this.getHeight(), paint);
 72                 //-----------利用填充画布，刷屏
 73                 //        canvas.drawColor(Color.BLACK);
 74                 //-----------利用填充画布指定的颜色分量，刷屏
 75                 // 没重画图像会叠在一起
 76                 canvas.drawRGB(0, 0, 0);
 77                 canvas.drawText("Game", x, y, paint);
 78             }
 79         } catch (Exception e) {
 80             // TODO: handle exception
 81         } finally {
 82             if (canvas != null)
 83                 // 解锁和提交画布
 84                 sfh.unlockCanvasAndPost(canvas);
 85         }
 86     }
 87 
 88     @Override
 89     /**
 90      * surfaceView被销毁时执行的方法
 91      */
 92     public void surfaceDestroyed(SurfaceHolder holder) {
 93         // TODO Auto-generated method stub
 94         
 95     }
 96     
 97 
 98     @Override
 99     /**
100      * 触摸屏幕事件
101      */
102     public boolean onTouchEvent(MotionEvent event) {
103         // TODO Auto-generated method stub
104         x= (int) event.getX();
105         y= (int) event.getY();
106         return true;
107     }
108 
109     
110     /**
111      * 游戏逻辑
112      */
113     private void logic() {
114         
115     }
116     @Override
117     public void run() {
118         while (flag) {
119             long start = System.currentTimeMillis();
120             Mydraw();
121             logic();
122             long end = System.currentTimeMillis();
123             try {
124                 // 50毫秒刷新一次
125                 if (end - start < 50) {
126                     Thread.sleep(50 - (end - start));
127                 }
128             } catch (InterruptedException e) {
129                 e.printStackTrace();
130             }
131         }
132     }
133 
134 
135 }