直接看這里吧，我只是搬運工。 ?

定時執行在一段時候后停止的倒計時，在倒計時執行過程中會在固定間隔時間得到通知（譯者：觸發onTick方法），下面的例子顯示在一個文本框中顯示一個30s倒計時：?
Java代碼??

new?CountdownTimer(30000,?1000)?{??

?????public?void?onTick(long?millisUntilFinished)?{??

?????????mTextField.setText("seconds?remaining:?"?+?millisUntilFinished?/?1000);??

?????}??

?????public?void?onFinish()?{??

?????????mTextField.setText("done!");??

?????}??

?}.start();???

onTick的調用是同步的，保證這次調用不會在之前調用完成前發生。這里的同步機制主要是用來：onTick的實現需要很多時間執行比倒計時間隔更重要的事情。?

構造函數?
???????? public CountDownTimer (long millisInFuture, long countDownInterval)?
參數?
?????????????????? millisInFuture? 從開始調用start()到倒計時完成并onFinish()方法被調用的毫秒數。（譯者注：倒計時時間，單位毫秒）?
?????????????????? countDownInterval? 接收onTick(long)回調的間隔時間。（譯者注：單位毫秒）?

公共方法?
public final void cancel ()?
???????? 取消倒計時（譯者：取消后，再次啟動會重新開始倒計時）????????
??????????????????
public abstract void onFinish ()?
???????? 倒計時完成時被調用????

public abstract void onTick (long millisUntilFinished)?
???????? 固定間隔被調用?
參數?
??????????????????????????? millisUntilFinished?? 倒計時剩余時間。?

public synchronized final CountDownTimer start ()?
???????? 啟動倒計時?
Java代碼??

import?android.app.Activity;??

import?android.os.Bundle;??

import?android.os.CountDownTimer;??

import?android.util.Log;??

import?android.view.View;??

import?android.view.View.OnClickListener;??

import?android.widget.Button;??

import?android.widget.TextView;??

???

import?com.test.R;??

???

public?class?CountDownTimeActivity?extends?Activity?implements?OnClickListener?{??

???

????TextView?mTextView;??

????Button?mButton1;??

????Button?mButton2;??

?????

????@Override??

????protected?void?onCreate(Bundle?savedInstanceState)?{??

???????super.onCreate(savedInstanceState);??

????????

???????setContentView(R.layout.countdown);??

????????

???????mTextView?=?(TextView)findViewById(R.id.textView1);??

???????mButton1?=?(Button)findViewById(R.id.button1);??

???????mButton2?=?(Button)findViewById(R.id.button2);??

???????mButton1.setOnClickListener(this);??

???????mButton2.setOnClickListener(this);??

????}??

???

????CountDownTimer?timer?=?new?CountDownTimer(40000,1000)?{??

????????

???????@Override??

???????public?void?onTick(long?millisUntilFinished)?{??

???????????mTextView.setText("seconds?remaining:?"?+?millisUntilFinished?/?1000);??

???????????try?{??

??????????????Thread.sleep(1200);??

???????????}?catch?(InterruptedException?e)?{??

??????????????e.printStackTrace();??

???????????}??

???????????Log.e("CountDown",millisUntilFinished+"");??

???????}??

????????

???????@Override??

???????public?void?onFinish()?{??

???????????mTextView.setText("done！");??

???????}??

????};??

?????

????@Override??

????public?void?onClick(View?v)?{??

???????switch(v.getId()){??

???????case?R.id.button1:??

???????????timer.start();??

???????????break;??

???????case?R.id.button2:??

???????????timer.cancel();??

???????????break;??

???????}??

????????

????}??

} ?

@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activation);
initView();
resendBTCountDownTimer(resendBtn,false);
}

/**
* 重發驗證碼按鈕倒計時操作
* @param resendBtn
* @param resendCode： false初始化并倒計時開始；true點擊次數倒計時開始并重新獲取驗證碼操作
*/
public void resendBTCountDownTimer(final Button resendBtn,boolean resendCode){
if(resendCount>5){
resendBtn.setText(R.string.resentcode_5times_tips);
resendBtn.setEnabled(false);
resendBtn.setBackgroundResource(R.drawable.button_no_cliable);
return;
}else{
new CountDownTimer(MILLIS_INFUTURE, COUNTDOWN_INTERVAL) {
@Override
public void onTick(long millisUntilFinished) {
resendBtn.setEnabled(false);
resendBtn.setBackgroundResource(R.drawable.button_no_cliable);
resendBtn.setText(getString(R.string.regetcodeafter30s, millisUntilFinished/1000));
}
@Override
public void onFinish() {
resendBtn.setText(R.string.resend_code);
resendBtn.setEnabled(true);
resendBtn.setBackgroundResource(R.drawable.registbtn);
}
}.start();
if(resendCode){
resendCount++ ;
regetCheckCodeFun();
}
}
}

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