Question

new CountDownTimer(30000, 1000) {

     public void onTick(long millisUntilFinished) {
         mTextField.setText("seconds remaining: " + millisUntilFinished / 1000);
     }

     public void onFinish() {
         mTextField.setText("done!");
     }
  }.start()

这有助于我创建一个计时器，但我怎么能尽快创建一个计时器上述计时器完成并在计时器时生成通知饰面

Answer 1

首先：创建一个扩展CountDownTimer的类

public class SecondTimer extends CountDownTimer{

        public SecondTimer(long millisInFuture, long countDownInterval) {
            super(millisInFuture, countDownInterval);
        }

        @Override
        public void onTick(long millisUntilFinished) {

        }

        @Override
        public void onFinish() {
        //Generate notification here
        }
    }

第二：初始化该类的实例

SecondTimer secondTimer = new SecondTimer(5000,1000);

第三：当第一个计时器停止时启动SecondTimer

public class FirstTimer extends CountDownTimer{

        public SecondTimer(long millisInFuture, long countDownInterval) {
            super(millisInFuture, countDownInterval);
        }

        @Override
        public void onTick(long millisUntilFinished) {

        }

        @Override
        public void onFinish() {
        secondTimer.start();
        }
    }


FirstTimer firstTimer = new FirstTimer(5000,1000);
firstTimer.start();

Answer 2

您不应将CountDownTimer定义为匿名类，而应将其定义在自己的文件中。然后你可以调用：new CountDownTimer（30000,1000）在前一个的onFinish（）方法中启动它。通知，你可以。 G。使用Toasts或Snackbars。

Answer 3

这应该可以正常工作

package com.stackoverflow.example;

import android.os.CountDownTimer;

/**
 * @author aminu on 5/7/2016.
 */
public class CountDownTimerHelper {

    private int numOfRuns;
    private long millisInFuture, countDownInterval;


    private CountDownTimerHelper(int numOfRuns, long millisInFuture, long countDownInterval) {
        //you may check for invalid arguments here like negative intervals

        this.numOfRuns = numOfRuns;
        this.millisInFuture = millisInFuture;
        this.countDownInterval = countDownInterval;
    }

    private void tryRun() {
        if (numOfRuns-- > 0) {
            new CountDownTimerImpl(millisInFuture, countDownInterval).start();
        }
    }


    public static void startCountDownTimers(int numOfRuns, long millisInFuture, long countDownInterval) {
        new CountDownTimerHelper(numOfRuns, millisInFuture, countDownInterval).tryRun();
    }

    private class CountDownTimerImpl extends CountDownTimer {
        /**
         * @param millisInFuture    The number of millis in the future from the call
         *                          to {@link #start()} until the countdown is done and {@link #onFinish()}
         *                          is called.
         * @param countDownInterval The interval along the way to receive
         *                          {@link #onTick(long)} callbacks.
         */
        private CountDownTimerImpl(long millisInFuture, long countDownInterval) {
            super(millisInFuture, countDownInterval);
        }

        @Override
        public void onTick(long millisUntilFinished) {
            //mTextField.setText("seconds remaining: " + millisUntilFinished / 1000);
        }

        @Override
        public void onFinish() {
            //notify user countdown ended by showing toast or something like that

            //mTextField.setText("done " + "remaining " + numOfRuns + ");

            tryRun();
        }

    }
}

然后使用它只需CountDownTimerHelper.startCountDownTimers(numOfRuns,yourDuration,yourInterval)

的例如 CountDownTimerHelper.startCountDownTimers(5,15000,1000) //this will run 5 successive countdowntimers with duration 15 seconds and interval 1 second

我想创建一个倒数计时器，一旦计时器结束，我想要另一个倒数计时器运行

3 个答案: