更新游戏画面时线程的问题

作者daytodayme
http://www.iteye.com/topic/435147
[b]
调用Handler.post(Runnable r)方法,Runnable运行在UI所在线程,所以可以直接调用View.invalidate()[/b]

[quote]package com.ray.test;

import android.app.Activity;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.os.Bundle;
import android.os.Handler;
import android.view.View;

public class TestHandler extends Activity {
private MyView myView;
private Handler mHandler;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
myView = new MyView(this);
mHandler = new Handler();
mHandler.post(new Runnable(){
@Override
public void run() {
myView.invalidate();
mHandler.postDelayed(this, 5);
}
});
setContentView(myView);
}

class MyView extends View{
private float x = 0f;
public MyView(Context context) {
super(context);

}
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
x+=1;
Paint mPaint = new Paint();
mPaint.setColor(Color.BLUE);
canvas.drawRect(x, 40, x+40, 80, mPaint);
}

}
} [/quote]

[b]
在新线程里更新UI,可以直接postInvalidate() [/b]

public void onCreate(Bundle savedInstanceState) {      
               super.onCreate(savedInstanceState);      
               this.requestWindowFeature(Window.FEATURE_NO_TITLE);      

               myView = new MyView(this);  
       this.setContentView(this.myView);      
       new Thread(new myThread()).start();     
}      

    class myThread implements Runnable {      
          public void run() {     
              while (!Thread.currentThread().isInterrupted()) {      
                   try {  
                          myView.postInvalidate();   
                        Thread.sleep(100);       
                   } catch (InterruptedException e) {      
                        Thread.currentThread().interrupt();      
                   }      
               }      
          }      
    }