安装后无法开始每日通知

Question

我正在开发一个具有每日通知的android应用程序。我有解决方案，但还不够。重新启动手机后，我的代码正常工作。除非需要，否则用户将不会重新启动其设备。我的通知要到这时才会显示。我该怎么解决？

BootReceiver.java

<ReactTable
  data={data}
  columns={columns}
  getTdProps={(cellInfo) => {
      return {
        if (cellInfo.value > 1) {
            cellInfo.className = "green-cell";
        }
        if (cellInfo.value < 1) {
            cellInfo.className = "red-cell";
        }
      };
    }}
/>

Manifest.xml

public class BootReceiver extends BroadcastReceiver {

    private AlarmManager alarmManager;
    private PendingIntent pendingIntent;

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

        Toast.makeText(context, "Device Booted", Toast.LENGTH_SHORT).show();

        Calendar calendar = Calendar.getInstance();
        calendar.setTimeInMillis(System.currentTimeMillis());
        calendar.set(Calendar.HOUR_OF_DAY, 19);
        calendar.set(Calendar.MINUTE, 20);
        calendar.set(Calendar.SECOND, 0);

        alarmManager = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
        Intent alarmIntent = new Intent(context, AlarmReceiver.class);
        pendingIntent = PendingIntent.getBroadcast(context, 1, alarmIntent, 0);

        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
            alarmManager.setExact(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), pendingIntent);
        }

    }
}

AlarmReceiver.java->通知构建器