利用Handler来更新android的UI
2010-08-24 05:43:00 来源:WEB开发网Thread myRefreshThread = null;
BounceView myBounceView = null;
Handler myHandler = new Handler() {
public void handleMessage(Message msg) {
switch (msg.what) {
case TestHandler.GUIUPDATEIDENTIFIER:
myBounceView.invalidate();
break;
}
super.handleMessage(msg);
}
};
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
this.requestWindowFeature(Window.FEATURE_NO_TITLE);
this.myBounceView = new BounceView(this);
this.setContentView(this.myBounceView);
new Thread(new myThread()).start();
}
class myThread implements Runnable {
public void run() {
while (!Thread.currentThread().isInterrupted()) {
Message message = new Message();
message.what = TestHandler.GUIUPDATEIDENTIFIER;
TestHandler.this.myHandler.sendMessage(message);
try {
Thread.sleep(100);
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
}
}
}
}
}
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);
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