利用Handler更新Android UI的另一种方法
文字程序很简单，一个View，一个Activity，利用handler和postInvalidate()更新UI。程序效果是一个蓝色的正方形向右移出屏幕。
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(update); setContentView(myView); } private Runnable update = new Runnable() { public void run() { myView.update(); mHandler.postDelayed(update, 5); } }; class MyView extends View{ private float x = 0f;public MyView(Context context) {super(context);}public void update(){postInvalidate();}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);} }} 之前还写过另外一篇关于Handler更新UI的文章：
http://rayleung.iteye.com/blog/411860
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