android postdelayed 定时,android开发步步为营之61:android定时任务之Handler.postDelayed

/**

*

*/

package com.figo.study;

import android.app.Activity;

import android.os.Bundle;

import android.os.Handler;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.Toast;

/**

* @author figo

*

*/

public class HandlerActivity extends Activity {

private Button btnHandler, btnClose;

private Handler handler;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_handler);

handler = new Handler();

btnHandler = (Button) findViewById(R.id.btnHandler);

btnClose = (Button) findViewById(R.id.btnClose);

// 开始执行定时任务

btnHandler.setOnClickListener(new OnClickListener() {

@Override

public void onClick(View v) {

// 1秒后执行run

handler.postDelayed(run, 1000);

}

});

// 关闭定时任务

btnClose.setOnClickListener(new OnClickListener() {

@Override

public void onClick(View v) {

handler.removeCallbacks(run);

}

});

}

// 其实是运行在UI主线程

Runnable run = new Runnable() {

@Override

public void run() {

// 这里new 一个AsyncTask或者Thread执行耗时任务，否则报ANR的bug

Toast.makeText(HandlerActivity.this, "test", Toast.LENGTH_SHORT)

.show();

// 每隔5秒后执行run方法

handler.postDelayed(this, 5000);

}

};

}

原文：http://blog.youkuaiyun.com/figo0423/article/details/45825133