AlarmManager重复

Question

我有一个闹钟，它在特定的时间发送通知(如果在那一天有联系人的生日)。

我需要的是，当我设置闹钟时，它应该在每年的同一天和同一时间重复。我怎么能这么做呢？

Intent myIntent = new Intent(Main.this, MyAlarmService.class);
pendingIntent = PendingIntent.getService(Main.this, 0, myIntent, 0);

AlarmManager alarmManager = (AlarmManager)getSystemService(ALARM_SERVICE);

Calendar cal = Calendar.getInstance();
cal.setTimeInMillis(System.currentTimeMillis());
cal.clear();
cal.set(2012,5,20,18,40);

alarmManager.set(AlarmManager.RTC_WAKEUP, cal.getTimeInMillis(), pendingIntent);

alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, cal.getTimeInMillis(), 60*60*24*365*1000, pendingIntent);

这是AlarmService：

public class MyAlarmService extends Service {
  static final int uniqueID = 1394885;
  private PendingIntent pendingIntent;

  @Override
  public void onCreate() {
    // TODO Auto-generated method stub
    Toast.makeText(this, "MyAlarmService.onCreate()", Toast.LENGTH_LONG).show();

  }

  @Override
  public IBinder onBind(Intent intent) {
    // TODO Auto-generated method stub
    Toast.makeText(this, "MyAlarmService.onBind()", Toast.LENGTH_LONG).show();
    return null;
  }

  @Override
  public void onDestroy() {
    // TODO Auto-generated method stub
    super.onDestroy();
    Toast.makeText(this, "MyAlarmService.onDestroy()", Toast.LENGTH_LONG).show();
  }

  @Override
  public void onStart(Intent intent, int startId) {
    // TODO Auto-generated method stub

  }

  @Override
  public boolean onUnbind(Intent intent) {
    // TODO Auto-generated method stub
    Toast.makeText(this, "MyAlarmService.onUnbind()", Toast.LENGTH_LONG).show();
    return super.onUnbind(intent);
  }
}

你能帮帮我吗？

Answer 1

Intent intent = new Intent(this, MyReceiver.class);
intent.putExtra("key", "Alert");
pendingIntent = PendingIntent.getBroadcast(this.getApplicationContext(), 0, intent, 0);

alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE);
Calendar calendar=Calendar.getInstance();

// Calendar.set(int year, int month, int day, int hourOfDay, int minute, int second)
calendar.set(2013, Calendar.OCTOBER, 13, 18, 55, 40);
alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), 5*1000, pendingIntent);

此参数是报警后续重复之间的时间间隔，单位为毫秒：

5*1000 =5秒

示例：

1year =365(天)*24(小时)*60(分钟)*60(秒)*1000(秒->毫秒)；

//闰年366天

month值是从0开始的，因此使用像Calendar.OCTOBER这样的常量可能会更清楚

MyReceiver.java

public class MyReceiver extends BroadcastReceiver {

  @Override
  public void onReceive(Context context, Intent intent) {
       Toast.makeText(context,intent.getStringExtra("key"),Toast.LENGTH_SHORT).show();
  }

}

update：注意:从API19 (Build.VERSION_CODES.KITKAT)开始，警报发送是不准确的:操作系统将移动警报，以最大限度地减少唤醒和电池消耗。有一些新的API可以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API19的应用程序将继续看到之前的行为，即所有告警都会在请求时准确传递。reference

我建议使用适用于安卓21的JobScheduler或适用于旧设备的Firebase JobDispatcher，而不是警报管理器

更新：谷歌发布了WorkManager作为JetPack Schedule tasks with WorkManager的一部分

Answer 2

使用alarmManager.set()设置闹钟

Intent myIntent = new Intent(Main.this, MyAlarmService.class);
pendingIntent = PendingIntent.getService(Main.this, 0, myIntent, 0);

AlarmManager alarmManager = (AlarmManager)getSystemService(ALARM_SERVICE);

Calendar cal = Calendar.getInstance();
cal.setTimeInMillis(System.currentTimeMillis());
cal.clear();
cal.set(2012,5,20,18,40);

alarmManager.set(AlarmManager.RTC_WAKEUP, cal.getTimeInMillis(), pendingIntent);  

而且，当闹钟响起时，从MyAlarmService设置下一年的闹钟。