Android Button控件与CountDownTimer的结合使用

XML文件

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

xmlns:tools="http://schemas.android.com/tools"

android:layout_width="match_parent"

android:layout_height="match_parent"

android:paddingBottom="@dimen/activity_vertical_margin"

android:paddingLeft="@dimen/activity_horizontal_margin"

android:paddingRight="@dimen/activity_horizontal_margin"

android:paddingTop="@dimen/activity_vertical_margin"

tools:context="com.demo.chang.MainActivity" >

<TextView

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="点击Button按钮，实现倒计时的功能"

android:textSize="20sp" />

<Button

android:id="@+id/Button"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_centerInParent="true"

android:text="开始计时"

android:textSize="50sp"

android:textColor="#FF0000"/>

</RelativeLayout>

Java文件：

package com.demo.chang;

import android.app.Activity;

import android.os.Bundle;

import android.os.CountDownTimer;

import android.view.Menu;

import android.view.MenuItem;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

public class MainActivity extends Activity {

private Button button=null;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

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

button.setOnClickListener(new OnClickListener() {

@Override

public void onClick(View v) {

// TODO Auto-generated method stub

timer.start();

}

});

}

//倒计时

private CountDownTimer timer=new CountDownTimer(60000,1000){

@Override

public void onFinish() {

// TODO Auto-generated method stub

button.setText("计时结束");

}

@Override

public void onTick(long millisUntilFinished) {

// TODO Auto-generated method stub

button.setText(millisUntilFinished/1000+"秒");

}

};

}

界面视图：

说明：点击开始计时按钮，就可以实现60秒的倒计时功能。即时效果如下