Question

我在android中实现了一个警报，但它大部分时间都会通知。

在我的应用程序中，我可以一次创建多个警报，但如果这样做，则只会通知最后一个警报。

请帮我找到解决方案。

Calendar calendar1 = Calendar.getInstance();
    calendar1.set(Calendar.HOUR_OF_DAY, 11);
    calendar1.set(Calendar.MINUTE, 55);
    calendar1.set(Calendar.SECOND, 0);
    calendar1.set(Calendar.AM_PM,Calendar.AM);

    Intent myIntent1 = new Intent(MainActivity.this, MyReceiver.class);
    pendingIntent = PendingIntent.getBroadcast(MainActivity.this, 0, myIntent1,0);

    AlarmManager alarmManager1 = (AlarmManager)getSystemService(ALARM_SERVICE);
    alarmManager1.setRepeating(AlarmManager.RTC, calendar1.getTimeInMillis(),3600000, pendingIntent);

Answer 1

这应设置两个闹钟，并允许闹钟唤醒您的设备，如果它已经睡着了......

Calendar calendar1 = Calendar.getInstance();
calendar1.set(Calendar.HOUR_OF_DAY, 11);
calendar1.set(Calendar.MINUTE, 55);
calendar1.set(Calendar.SECOND, 0);

PendingIntent pendingIntent1, pendingIntent2;
Intent myIntent1 = new Intent(MainActivity.this, MyReceiver.class);
pendingIntent1 = PendingIntent.getBroadcast(MainActivity.this, 0, myIntent1, PendingIntent.FLAG_UPDATE_CURRENT);
pendingIntent2 = PendingIntent.getBroadcast(MainActivity.this, 1, myIntent1, PendingIntent.FLAG_UPDATE_CURRENT);

AlarmManager alarmManager1 = (AlarmManager)getSystemService(ALARM_SERVICE);

alarmManager1.setRepeating(AlarmManager.RTC_WAKEUP, calendar1.getTimeInMillis(), 3600000, pendingIntent1);
calendar1.set(Calendar.MINUTE, 56);
alarmManager1.setRepeating(AlarmManager.RTC_WAKEUP, calendar1.getTimeInMillis(), 3600000, pendingIntent2);

注意getBroadcast(...)的第二个参数。这是requestCode，如果您想同时设置两个不同的警报，则必须是唯一的。

还要注意在触发警报时使用AlarmManager.RTC_WAKEUP唤醒设备。

Answer 2

作为mentioned，Android no longer triggers the alarm at the exact time, unless you explicitly request it：

注意：从API 19（KITKAT）开始，警报传递不准确：操作系统将移动警报以最小化唤醒和电池使用。有新的API支持需要严格交付保证的应用程序;请参阅setWindow（int，long，long，PendingIntent）和setExact（int，long，PendingIntent）。 targetSdkVersion早于API 19的应用程序将继续查看之前的行为，其中所有警报都在请求时准确传递。

重复警报无法做到这一点，警报总是在系统认为最佳时触发：

从API 19开始，所有重复警报都不准确。

有关多次警报的问题seems solved。

Answer 3

//更新清单

<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />

 <receiver android:name=".AlarmReceiver" >
        <intent-filter>
            <action android:name="android.intent.action.BOOT_COMPLETED" />
        </intent-filter>
    </receiver>

//创建类AlarmReceiver

public class AlarmReceiver extends BroadcastReceiver {

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

    // For our recurring task, we'll just display a message
    Toast.makeText(context, "I'm running", Toast.LENGTH_SHORT).show();
 }
}

//在主要活动中

//我设置了1号码闹钟，你可以拨打任意数量的闹钟

private PendingIntent pendingIntent;
AlarmManager alarmManager;

@Override
protected void onCreate(Bundle savedInstanceState)
{
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    Intent alarmIntent = new Intent(MainActivity.this, AlarmReceiver.class);
    pendingIntent = PendingIntent.getBroadcast(MainActivity.this, 0, alarmIntent, 0);

    alarmManager = (AlarmManager)getSystemService(ALARM_SERVICE);
    callAlarmWithNumber(alarmManager,1);
}

public void callAlarmWithNumber(AlarmManager alarm,int number) {
    switch (number)
    {
        case 1 :
            alarm = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
            /* Set the alarm to start at 10:30 AM */
            Calendar calendar = Calendar.getInstance();
            calendar.setTimeInMillis(System.currentTimeMillis());
            calendar.set(Calendar.HOUR_OF_DAY, 17);
            calendar.set(Calendar.MINUTE, 42);

            /* Repeating on every 1 minutes interval */
            alarm.setRepeating(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(),
                    1000 * 60 * 1, pendingIntent);
            break;

        default :
            break;
    }

}

android报警管理器通知迟到

3 个答案: