如何从倒数计时器中获取价值并显示到吐司中

Question

如果我点击开始按钮，我有从 1 到 9999 的倒计时计时器，计数将开始，但如果点击停止按钮，我需要从倒计时中获取当前值并在 toast 中显示该值，但如果我点击停止，倒计时无法停止按钮请帮助我

 private CountDownTimer countDownTimer;
         private boolean timerHasStarted = false;
         private Button startB;
         public TextView ;


         private final long startTime = 9999 * 1;

         private final long interval = 1 *1 ;

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

              startB = (Button) this.findViewById(R.id.button);
              startB.setOnClickListener(this);
              text = (TextView) this.findViewById(R.id.timer);
              countDownTimer = new MyCountDownTimer(startTime, interval);
              text.setText(text.getText() + String.valueOf(startTime / 1));
    }

    public void onClick(View v) {
          if (!timerHasStarted) {
           countDownTimer.start();
           timerHasStarted = true;
           startB.setText("STOP");
          } else {
           /*countDownTimer.cancel();
           timerHasStarted = false;
           startB.setText("RESTART");*/
          }
    }

    public class MyCountDownTimer extends CountDownTimer {

        public MyCountDownTimer(long startTime, long interval) {
            super(startTime, interval);

        }

        @Override
        public void onFinish() {

            //text.setText("Time's up!");
            countDownTimer.start();

        }
        @Override
        public void onTick(long millisUntilFinished) {

             text.setText("" + millisUntilFinished / 1);

        }       
    }

谢谢

Answer 1

这是我的倒计时：

QuestionCountdownTimer

public class QuestionCountdownTimer extends CountDownTimer {

private TextView remainingTimeDisplay;
private Context context;

public QuestionCountdownTimer(Context context,long millisInFuture, long countDownInterval,TextView remainingTimeDisplay) {
   super(millisInFuture, countDownInterval);
    this.context = context;
   this.remainingTimeDisplay = remainingTimeDisplay;
}

@Override
public void onTick(long millisUntilFinished) {
   long millis = millisUntilFinished;
   String hms = String.format("%02d:%02d",
           TimeUnit.MILLISECONDS.toMinutes(millis) - TimeUnit.HOURS.toMinutes(TimeUnit.MILLISECONDS.toHours(millis)),
           TimeUnit.MILLISECONDS.toSeconds(millis) - TimeUnit.MINUTES.toSeconds(TimeUnit.MILLISECONDS.toMinutes(millis)));
   remainingTimeDisplay.setText(hms);
}

@Override
public void onFinish() {
   Toast.makeText(context,"COUNTDOWN FINISH :)",Toast.LENGTH_SHORT).show();
}

}

注意： TextView 剩余时间显示

remainingTimeDisplay.setText(hms); 我用它来使用 TextView 显示剩余时间

我在这里调用计时器：

//Start Quiz timer
QuestionCountdownTimer timer = new QuestionCountdownTimer(this,10000, 1000, remainingTimeDisplay);
    timer.start();

-第一个参数：this - 我用它作为上下文来显示 Toast 消息

-second参数：10000-总时间（10秒）

-第三个参数：1000-倒计时间隔（1秒）

-last参数：实时显示剩余时间

经过测试并且可以正常工作

Answer 2

像这样创建您的 CountDownTimer：

public class MyCountDownTimer extends CountDownTimer
    {
        private long timePassed = 0;

        public MyCountDownTimer(long startTime, long interval)
        {
            super(startTime, interval);
        }

        @Override
        public void onFinish()
        {
            //text.setText("Time's up!");
            countDownTimer.start();
        }

        @Override
        public void onTick(long millisUntilFinished)
        {
            timePassed++;
            text.setText("" + millisUntilFinished / 1);
        }

        public long getTimePassed()
        {
            return timePassed;
        }
    }

然后在你的 onClick 上做：

((MyCoundDownTimer) countDownTimer).getTimePassed();

检索时间并将您的 textview 文本设置为它。

Answer 3

你应该使用处理程序

private Handler tickResponseHandler = new Handler() {
    public void handleMessage(Message msg) {
        int time = msg.what;
        //make toast or do what you want
    }
}

并将其传递给 MyCountDownTimer 构造函数

private Handler handler;

public MyCountDownTimer(long startTime, long interval, Handler handler) {
        super(startTime, interval);
        this.handler = handler;
}

并发送消息

@Override
public void onTick(long millisUntilFinished) {
    text.setText("" + millisUntilFinished / 1);
    Message msg = new Message();
    msg.what = millisUntilFinished/1;
    handler.sendMessage(msg);
}     

这就是你需要做的:)