我有代码：

public void AlarmStart() {

Calendar cal = Calendar.getInstance();

cal.add(Calendar.MINUTE, 5);

Intent intent = new Intent(MainNote.this, AlarmReceiver.class);

intent.putExtra("alarm_message", "MESS");

PendingIntent sender = PendingIntent.getBroadcast(MainNote.this, 1,

intent, PendingIntent.FLAG_UPDATE_CURRENT);

AlarmManager am = (AlarmManager) getSystemService(ALARM_SERVICE);

am.set(AlarmManager.RTC_WAKEUP, cal.getTimeInMillis(), sender);

}

它按时调用AlarmReceiver类.

public class AlarmReceiver extends BroadcastReceiver {

@Override

public void onReceive(Context context, Intent intent) {

Bundle bundle = intent.getExtras();

String message = bundle.getString("alarm_message");

NotifierHelper.sendNotification(?????, MainNote.class, "ba", "baba",

2, true, true);

} // Problem here

}

然后NotifierHelper类：

public class NotifierHelper {

private static final int NOTIFY_1 = 0x1001;

public static void sendNotification(Activity caller,

Class> activityToLaunch, String title, String msg,

int numberOfEvents, boolean flashLed, boolean vibrate) {

NotificationManager notifier = (NotificationManager) caller

.getSystemService(Context.NOTIFICATION_SERVICE);

final Notification notify = new Notification(R.drawable.icon, "",

System.currentTimeMillis());

notify.icon = R.drawable.icon;

notify.tickerText = "New Alerts";

notify.when = System.currentTimeMillis();

notify.number = numberOfEvents;

notify.flags |= Notification.FLAG_AUTO_CANCEL;

if (flashLed) {

// add lights

notify.flags |= Notification.FLAG_SHOW_LIGHTS;

notify.ledARGB = Color.CYAN;

notify.ledOnMS = 500;

notify.ledOffMS = 500;

}

if (vibrate) {

notify.vibrate = new long[] { 100, 200, 200, 200, 200, 200, 1000,

200, 200, 200, 1000, 200 };

}

Intent toLaunch = new Intent(caller, activityToLaunch);

PendingIntent intentBack = PendingIntent.getActivity(caller, 0,

toLaunch, 0);

notify.setLatestEventInfo(caller, title, msg, intentBack);

notifier.notify(NOTIFY_1, notify);

}

}

如何从AlarmReceiver传递Activity调用者？

解决方法:

我认为你不需要在NotifierHelper中引用任何Activity.使用Context(Activity是其子类),例如：

public static void sendNotification(Context caller, ...

getSystemService()等方法实际上是由Context公开的.

因为你在AlarmReceiver.onReceive()中传递了一个Context,你可以传递它.

标签：android,android-activity,notifications,alarm

来源： https://codeday.me/bug/20190518/1128417.html