Question

如何在用户指定的时间内启动我的应用程序。让我们说开始时间是早上8点，结束时间是下午4点我将开始时间和结束时间的值存储在共享首选项中。

public static synchronized void scheduleTimeoutCheck(final int time) {
    final Calendar calendar = Calendar.getInstance();
    calendar.set(Calendar.HOUR_OF_DAY, time / 100);
    calendar.set(Calendar.MINUTE, time % 100);
    calendar.set(Calendar.SECOND, 1); // Add 1 second of additional delay
    if (calendar.getTimeInMillis() - Calendar.getInstance().getTimeInMillis() <= 0) {
        // Time has already past, schedule for next day
        calendar.add(Calendar.DAY_OF_MONTH, 1);
    }

    new Timer(true).schedule(new TimerTask() {
        @Override
        public void run() {
           // "its time for scheduleTimeoutCheck
            /*if (Utility.checkSystemTimeout())
            {*/
                // Re - schedule this for the next day //
                Utility.checkLockdownAppSchedule();
           // }
        }
    }, calendar.getTime());

    System.out.println("Timeout Check is scheduled to run at " + calendar.getTime().toString());
}

Answer 1

启动应用程序意味着您想要在准确的时间开始活动？我认为这不是一个好的用户案例。但是对于此任务，您必须将AlarmManager, plus a Service与您的逻辑一起使用（服务对用户不可见）。如果您想要通知用户您可以使用NotificationManager。或者在最后一种情况下，您可以使用对话框启动半透明活动。请注意，要从服务启动活动，您应该设置key SINGLE_TASK

Answer 2

你要做的事情已经完整描述here

首先在某个地方安排您的时间，例如onCreate()：

//create new calendar instance for your start time
Calendar startTime= Calendar.getInstance();

//set the time to 4AM or your USER SPECIFIED start time
startTime.set(Calendar.HOUR_OF_DAY, 4);
startTime.set(Calendar.MINUTE, 0);
startTime.set(Calendar.SECOND, 0);

AlarmManager am = (AlarmManager) LayoutActivity.this.getSystemService(ALARM_SERVICE);

//create a pending intent to be called at 4AM
PendingIntent startPI = PendingIntent.getService(yourActivity.this, 0, new Intent("startApplicationReceiver"), PendingIntent.FLAG_UPDATE_CURRENT);

//schedule time for pending intent, and set the interval to day so that this event will repeat at the selected time every day
am.setRepeating(AlarmManager.RTC_WAKEUP, startTime.getTimeInMillis(), AlarmManager.INTERVAL_DAY, startPI);

//----------------------------------------------------

//create new calendar instance for your end time
Calendar endCalender = Calendar.getInstance();

//Set the time to 8PM or your USER SPECIFIED end time
endCalender.set(Calendar.HOUR_OF_DAY, 8);
endCalender.set(Calendar.MINUTE, 0);
endCalender.set(Calendar.SECOND, 0);

//create a pending intent to be called at 8 AM
PendingIntent endPI= PendingIntent.getService(yourActivity.this, 0, new Intent("endApplicationReceiver"), PendingIntent.FLAG_UPDATE_CURRENT);

//schedule time for pending intent, and set the interval to day so that this event will repeat at the selected time every day
am.setRepeating(AlarmManager.RTC_WAKEUP, endCalender.getTimeInMillis(), AlarmManager.INTERVAL_DAY, endPI);

添加警报类：

开始时间接收器：

public class startApplicationReceiver extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {

        try {                                 //Start your application
            Intent intent = new Intent();    
             intent.setClassName("package.name", "<your_package_name>");
            startActivity(intent);
         } catch (NameNotFoundException e) {  //You don't have the application installed
            Log.e(TAG, e.getMessage());
         }

        //!!!If you WANT to repeat the start application alarm EVERY day
        //Comment/Remove the next 4 lines

        //Cancel start time alarm
        Intent intent = new Intent(yourActivity.this, startApplicationReceiver.class);
        PendingIntent startPI = PendingIntent.getBroadcast(this, 0, intent, 0);
        AlarmManager alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE);
        alarmManager.cancel(startPI);
    }
}

结束时间接收器

public class endApplicationReceiver extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {

        //finish your application
        finish();

        //!!!If you WANT to repeat the endapplication alarm EVERY day
        //Comment/Remove the next 4 lines

        //Cancel end time alarm
        Intent intent = new Intent(yourActivity.this, endApplicationReceiver.class);
        PendingIntent endPI = PendingIntent.getBroadcast(this, 0, intent, 0);
        AlarmManager alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE);
        alarmManager.cancel(endPI);
    }
}

你需要做的最后一件事就是在你的

中注册你的接收器

<强>的Manifest.xml：

<receiver android:name="startAlarm" >
    <intent-filter>
        <action android:name="startApplicationReceiver" >
        </action>
    </intent-filter>
</receiver>

<receiver android:name="endAlarm" >
    <intent-filter>
            <action android:name="endApplicationReceiver" >
            </action>
    </intent-filter>
</receiver>

这应该可以帮到你。

注意：您必须至少手动启动一次应用程序，才能注册警报接收器。

Answer 3

您可以使用 AlarmManager 来实现此类功能。

要充分了解如何实施它，you can study this good article.和this one by Java Code Geeks.

Android：开始＆amp;在用户指定时间关闭应用程序

3 个答案: