Question

如果我点击开始按钮计数将开始，我有倒数计时器从1到9999但是如果点击停止按钮我需要从倒计时获取当前值并在吐司中显示该值但是如果我点击停止倒计时则无法停止按钮请帮帮我

 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

这是我的倒数计时器：

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 remainingTimeDisplay

remainingTimeDisplay.setText（HMS）; 我用它来显示使用TextView的剩余时间

我在这里打电话给计时器：

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

-first parameter：this - 我用它来显示Toast消息的上下文

- 第二参数：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

经过测试和工作

Answer 2

像这样创建你的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;
        }
    }

在onClick上只做：

((MyCoundDownTimer) countDownTimer).getTimePassed();

检索时间并将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;
}

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);
}

这就是你需要做的一切:)

如何从倒计时器中获取价值并显示为吐司

3 个答案: