Question

在这里需要一些帮助......如何创建一个按钮，当我的设备中的时间是早上6点到8点59分时可以看到...当时间是上午9点时按钮将消失。请帮助，我只是newBie在android中学习新东西。谢谢！

Answer 1

您可以使用java.util.Calendar

    Calendar SIX_AM = Calendar.getInstance();
    SIX_AM.set(Calendar.HOUR_OF_DAY,6);
    SIX_AM.set(Calendar.MINUTE,0);
    SIX_AM.set(Calendar.SECOND,0);
    Calendar NINE_AM = Calendar.getInstance();
    NINE_AM.set(Calendar.HOUR_OF_DAY,9);
    NINE_AM.set(Calendar.MINUTE,0);
    NINE_AM.set(Calendar.SECOND,0);
    Calendar SIX_PM = Calendar.getInstance();
    SIX_PM.set(Calendar.HOUR_OF_DAY,18);
    SIX_PM.set(Calendar.MINUTE,0);
    SIX_PM.set(Calendar.SECOND,0);
    Calendar NINE_PM = Calendar.getInstance();
    NINE_PM.set(Calendar.HOUR_OF_DAY,21);
    NINE_PM.set(Calendar.MINUTE,0);
    NINE_PM.set(Calendar.SECOND,0);
    Calendar current = Calendar.getInstance();
    if(current.compareTo(SIX_AM)>=0 && current.compareTo(NINE_AM)<0) {
        btnAm.setVisibility(View.VISIBLE);
    } else {
        btnAm.setVisibility(View.GONE);
    }
    if(current.compareTo(SIX_PM)>=0 && current.compareTo(NINE_PM)<0) {
        btnPm.setVisibility(View.VISIBLE);
    } else {
        btnPm.setVisibility(View.GONE);
    }

希望有所帮助

Answer 2

在您的情况下，AlarmManager将起作用。设置两个警报

早上6点（按逻辑处理是时候显示按钮）
上午8:59（按逻辑处理，是时候隐藏按钮）

How to start Service using Alarm Manager in Android?

对于你我建议使用setExact而不是setRepeating。这是代码......

AlarmManager am = (AlarmManager) 
context.getSystemService(Context.ALARM_SERVICE);
int ALARM_TYPE = AlarmManager.RTC_WAKEUP;
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP)
    am.setExact(ALARM_TYPE, calendar.getTimeInMillis(), pendingIntent);
else
    am.set(ALARM_TYPE, calendar.getTimeInMillis(), pendingIntent);

请记住，setExact不提供重复功能，因此每次您必须再次从服务中设置它...

有时间设置显示和隐藏的按钮

2 个答案: