CountDownTimer----Android API

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CountDownTimer是android.os中的类，它提供了倒计时器的功能。

官方给出的例子如下：

 new CountDownTimer(30000, 1000) {     public void onTick(long millisUntilFinished) {         mTextField.setText("seconds remaining: " + millisUntilFinished / 1000);     }     public void onFinish() {         mTextField.setText("done!");     }  }.start();

CountDownTimer初始化两个参数，millisInFuture和countDownInterval。分别代表倒计时时长，倒计时单位。

使用如下：

package com.example.countdowntimerdemo;import android.app.Activity;import android.os.Bundle;import android.os.CountDownTimer;import android.widget.TextView;public class MainActivity extends Activity {private TextView mTextTimer;private CountDownTimer mCountDown;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);mTextTimer = (TextView) findViewById(R.id.timer);mCountDown = new CountDownTimer(15000, 1000) {@Overridepublic void onTick(long millisUntilFinished) {// TODO Auto-generated method stubmTextTimer.setText(String.valueOf((millisUntilFinished/1000)));}@Overridepublic void onFinish() {// TODO Auto-generated method stubmTextTimer.setText("Time's up");}};mCountDown.start();}}

倒计时器会通过回调onTick和onFinish回调对TextViwe进行设置。

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