如何在android studio中停止計時器，然后從停止時重新開始？

Question

我正在制作一個番茄鍾定時器應用程序。 我已經實現了播放和停止功能。 現在我正在嘗試實現暫停功能。 當我按下暫停按鈕時，它成功暫停了計時器，但是，當我再次按下播放按鈕時，它會從 25:00 重新開始，而不是從我停止的時間開始。 我如何實現這個方法？

代碼如下：

package com.example.treeplanting;

import androidx.appcompat.app.AppCompatActivity;

import android.media.MediaPlayer;
import android.os.Bundle;
import android.os.CountDownTimer;
import android.view.View;
import android.widget.ImageView;
import android.widget.SeekBar;
import android.widget.TextView;

import java.util.concurrent.TimeUnit;

@SuppressWarnings("unused")
public class Pomodoro extends AppCompatActivity {

    private TextView tvTimer, tvMotivationalQuote;
    private ImageView ivStop, ivPause, ivPlay;
    private SeekBar seekBar;

    private CountDownTimer countDownTimer;
    private boolean isRest = false;
    private int userSelectedDuration = -1;

    private final int ONE_SECOND_TICK = 1000;
    private int counter = 0;

    MediaPlayer mediaPlayer;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_pomodoro);

        tvTimer = findViewById(R.id.tvTimer);
        tvMotivationalQuote = findViewById(R.id.tvMotivationalQuote);
        ivPlay = findViewById(R.id.ivPlay);
        ivStop = findViewById(R.id.ivStop);
        ivPause = findViewById(R.id.ivPause);

        seekBar = findViewById(R.id.seekBar);

        tvMotivationalQuote.setText(MethodsContainer.getMotivationalQuote());

        // Setting up Seek Bar

        seekBar.setMax(2500);
        seekBar.setProgress(1500);
        seekBar.setVisibility(View.GONE);

        tvTimer.setText("25:00");
    }

    // On click methods

    public void startTimer(View v){
        ivPlay.setClickable(false);

        isRest = false;
        int duration = seekBar.getProgress();
        userSelectedDuration = duration;
        restartTimer(duration);

        ivStop.setClickable(true);
    }

    public void stopTimer(View v){
        ivPlay.setClickable(true);

        seekBar.setProgress(1500);
        tvTimer.setText("25:00");

        ivStop.setClickable(false);
    }

    public void pauseTimer(View v){
        if(countDownTimer != null) {
            countDownTimer.cancel();
        }

        ivPlay.setClickable(true);
    }

    // Update methods

    private void updateTimer(int progress){
        int minutes = progress / 60;
        int seconds = progress - minutes * 60;

        String textMinutes = String.valueOf(minutes);
        String textSeconds = String.valueOf(seconds);

        if(seconds < 10) textSeconds = "0" + textSeconds;
        if(minutes < 10) textMinutes = "0" + textMinutes;

        tvTimer.setText(textMinutes + ":" + textSeconds);
    }

    private void restartTimer(int duration){
        countDownTimer = new CountDownTimer(TimeUnit.SECONDS.toMillis(duration) + 100, ONE_SECOND_TICK) {
            @Override
            public void onTick(long millisUntilFinished) {
                updateTimer((int) millisUntilFinished / 1000);
            }

            @Override
            public void onFinish() {
                breakTimer();

                counter = counter + 1;

                mediaPlayer = MediaPlayer.create(Pomodoro.this, R.raw.alarm);
                mediaPlayer.start();
            }
        };

        countDownTimer.start();
    }

    private void breakTimer(){
        isRest = !isRest;


        if(isRest){
            seekBar.setProgress(300);
            tvTimer.setText("5:00");
            restartTimer(300);
        } else{
            restartTimer(userSelectedDuration);
        }
    }
}

****輸出：25:00 -> 24:05（我按下暫停按鈕，它停止...） -> 我按下播放按鈕 -> 24:59 預期輸出：25:00 -> 24:05（我按下暫停按鈕，它停止了...) -> 我按下播放按鈕 -> 24:04** **

Answer 1

查看此內容以獲取有關開發倒數計時器應用程序的幫助：

https://github.com/harish124/Android_Data_Binding/tree/master/AlarmClock