顯示「剩餘時間」，直到鬧鐘開始

Question

我想在Android中創建一個鬧鐘（AlarmManager）。 警報必須顯示剩餘時間，直到完成。

因此，用戶點擊「在11點設置鬧鐘」，並在TextView中看到「以xy小時/分鐘/秒鐘報警」。

我該如何做到這一點？

謝謝。

Answer 1

嘗試這樣

Calendar calendar = Calendar.getInstance(); 
    Long preTime = calendar.getTimeInMillis(); 

    // set alarm after 5 minute 

    calendar.add(Calendar.MINUTE, 5); 
    Long postTime = calendar.getTimeInMillis(); 
    Long delay = postTime - preTime; 

    AlarmManager manager = (AlarmManager)  getSystemService(Context.ALARM_SERVICE); 
    manager.set(AlarmManager.RTC_WAKEUP, postTime, null); 

    CountDownTimer timer = new CountDownTimer(delay, 1) { 

     @Override 
     public void onTick(long millisUntilFinished) { 
      final int seconds = (int) (millisUntilFinished/1000) % 60; 
      final int minutes = (int) ((millisUntilFinished/(1000 * 60)) % 60); 

      runOnUiThread(new Runnable() { 

       @Override 
       public void run() { 
        text.setText("minute " + minutes + " Second " + seconds); 
       } 
      }); 
     } 

     @Override 
     public void onFinish() { 
      // TODO Auto-generated method stub 

     } 
    }; 
    timer.start(); 

Answer 2

//INIT 
Calendar c = Calendar.getInstance(); 
int hNow = c.get(Calendar.HOUR_OF_DAY); //get the Hour 
int mNow = c.get(Calendar.MINUTE);   //get the Minute 

int hAlarm = 8;  //your alarm Hour 
int mAlarm = 30;  //your alarm Minute 

//FUNCTION 

int timeLeft = (hAlarm * 60 + mAlarm) - (hNow * 60 + mNow); 
if(timeLeft < 0) 
    timeLeft = 1440 + timeLeft; 
int hLeft = timeLeft/60;  //this is the hours left 
int mLeft = timeLeft % 60;  //this is the minutes left