CountDownTimer完整具体演示样例

MainActivity例如以下:

package cc.cv;

import android.os.Bundle;
import android.os.CountDownTimer;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.app.Activity;
/**
 * Demo演示样例:
 * CountDownTimer完整具体演示样例
 * 代码非常easy,直接看凝视就可以
 *
 * CountDownTimer是Android4.0引入的倒计时
 */
public class MainActivity extends Activity {
	private Button mStartButton;
	private Button mCancelButton;
    private CountDownTimerSubClass mCountDownTimerSubClass;
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);
		init();
	}

	private void init(){
		mCountDownTimerSubClass=new CountDownTimerSubClass(15*1000, 1000);
		mStartButton=(Button) findViewById(R.id.startButton);
		//開始倒计时
		mStartButton.setOnClickListener(new OnClickListener() {
			@Override
			public void onClick(View view) {
				mCountDownTimerSubClass.start();
			}
		});
		//取消倒计时.
		//再次调用CountDownTimer的start时会又一次開始倒计时.
		mCancelButton=(Button) findViewById(R.id.cancelButton);
		mCancelButton.setOnClickListener(new OnClickListener() {
			@Override
			public void onClick(View view) {
				mCountDownTimerSubClass.cancel();
			}
		});
	}

	private class CountDownTimerSubClass extends CountDownTimer{
		/**
		 * millisInFuture 倒计时间
		 * countDownInterval 每两次倒计时之间的间隔
		 */
		public CountDownTimerSubClass(long millisInFuture,long countDownInterval) {
			super(millisInFuture, countDownInterval);
		}

		/**
		 * 倒计时结束
		 */
		@Override
		public void onFinish() {
			System.out.println("结束");
		}

		/**
		 * 每个倒计时间点到来时均会触发该方法
		 * millisUntilFinished表示整个倒计时剩余的时间
		 */
		@Override
		public void onTick(long millisUntilFinished) {
			long remainedSeconds=millisUntilFinished/1000;
			System.out.println("剩余: "+remainedSeconds+" s");
		}

	}

}

main.xml例如以下:

<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"
    >

    <Button
        android:id="@+id/startButton"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="100dp"
        android:text="start" />

     <Button
        android:id="@+id/cancelButton"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_below="@id/startButton"
        android:layout_marginTop="100dp"
        android:text="cancel" />

</RelativeLayout>