运行如果日期是第二天的方法

Question

我想做这样的事情：

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity);

 int i = (int) (new Date().getTime()/1000);

   if(      ) // next day
     {
         mymethod();
     }
}

当系统日期是新的一天时，我想调用mymethod()

Answer 1

建议使用Calendar class代替Date。你可以这样查看一天是否过去了：

在某些事件中，例如button click, app first start, 保存时间在sharedPreferences

检索该值并将其与当前时间进行比较仅举例说明如何执行此操作：

protected void onCreate(Bundle savedInstanceState){

    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity);

    Calendar c = Calendar.getInstance(); 
    int currentTimeSeconds = c.get(Calendar.SECOND);

    SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this);
    int secondsPreviousDay = prefs.getInt("seconds", 0);
    if (secondsPreviousDay != 0){ //means there was an earlier set value from previously entering the activity
        //compare if more than 3600*24 = 86400 (1 day in seconds) had passed
        if (currentTimeSeconds - secondsPreviousDay > 86400){
             mymethod();
        }
    }
    else {
        prefs.edit().putInt("seconds", currentTimeSeconds).apply();
    }
}

在我的代码中，我假设您想查看从第一次开始 activity 到第二次开始是否过了一天。您可以根据自己的喜好进行调整，但我希望这个想法是可以理解的。

I know I could've compacted those 2 if's into one, but I just wanted it to be more clear what I was after.

Answer 2

好主意！

在我的第一个 activity 中，我在 onCreate 中设置了这样的东西：

 Calendar c = Calendar.getInstance();
    int currentTimeSeconds = c.get(Calendar.SECOND);
    SharedPreferences share = PreferenceManager.getDefaultSharedPreferences(this);
    SharedPreferences.Editor edittime = share.edit();
    edittime.putInt("timevalue",currentTimeSeconds);
    edittime.commit();

并在 onCreate 中的另一个 activity 中使用您的代码：

    SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this);
    int secondsPreviousDay = prefs.getInt("seconds", 0);
    if (secondsPreviousDay != 0){ //means there was an earlier set value from previously entering the activity
        //compare if more than 3600*24 = 86400 (1 day in seconds) had passed
        if (currentTimeSeconds - secondsPreviousDay > 86400){
           // mymethod();
            mymethod();

        }
    }
    else {
        prefs.edit().putInt("seconds", currentTimeSeconds).apply();
    }
}

很抱歉，但我还在学习

Answer 3

新的一天是指午夜之后吗？所以你想检测日期是否与上次不同？

  @Override
  protected void onResume() {
     SharedPreferences settings = PreferenceManager.getDefaultSharedPreferences(this);
     int lastTimeStarted = settings.getInt("last_time_started", -1);
     Calendar calendar = Calendar.getInstance();
     int today = calendar.get(Calendar.DAY_OF_YEAR);

    if (today != lastTimeStarted) {
      //startSomethingOnce();

      SharedPreferences.Editor editor = settings.edit();
      editor.putInt("last_time_started", today);
      editor.commit();
    }
  }

运行如果日期是第二天的方法

Run a method if Date is the next day

java

android

java.util.date

运行 如果日期是第二天的方法

Run a method if Date is the next day

java

android

java.util.date

运行如果日期是第二天的方法