我正在尝试使用警报管理器发送和接收广播,该广播将调用创建通知的方法。我希望即使关闭应用程序也会创建通知。我使用此方法创建了一个类,该类在“警报管理器”中创建警报:
@android.webkit.JavascriptInterface
public void qotd(String toast, int hour, int minute) {
// for testing purposes
Toast.makeText(mContext, (String.valueOf(hour) + " " + String.valueOf(minute)), Toast.LENGTH_SHORT).show();
// cancel other alarms first
Intent alarmtocancel = new Intent(mContext, loadqotd.class);
PendingIntent cancelIntent = PendingIntent.getBroadcast(mContext, 1001, alarmtocancel, PendingIntent.FLAG_CANCEL_CURRENT);
AlarmManager am = (AlarmManager) getSystemService(mContext.ALARM_SERVICE);
am.cancel(cancelIntent);
cancelIntent.cancel();
// create new alarm
Intent alarmintent = new Intent(mContext, loadqotd.class);
AlarmManager setam = (AlarmManager) getSystemService(mContext.ALARM_SERVICE);
PendingIntent pendingIntent = PendingIntent.getService(mContext, 0, alarmintent, 0);
Calendar calendar = Calendar.getInstance();
calendar.setTimeInMillis(System.currentTimeMillis());
calendar.set(Calendar.HOUR_OF_DAY, hour);
calendar.set(Calendar.MINUTE, minute);
setam.setRepeating(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), 24 * 60 * 60 * 1000, pendingIntent);
}
这是接收器,我将其放置在Main Activity中:
public class loadqotd extends BroadcastReceiver{
@Override
public void onReceive(Context context, Intent intent) {
// testing purposes
Toast.makeText(context, "received", Toast.LENGTH_SHORT).show();
Intent resultIntent = new Intent(context, QuestionOfTheDay.class);
NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(context);
mBuilder.setSmallIcon(R.drawable.notification_icon)
.setContentTitle("Your Question of the Day is ready!")
.setContentText("Check out the question of today")
.setContentIntent(PendingIntent.getActivity(context, 0, resultIntent, PendingIntent.FLAG_UPDATE_CURRENT));
int notid = 001;
NotificationManager notificationManager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
notificationManager.notify(notid, mBuilder.build());
}
}
这是清单:
...
<application>
<receiver android:name=".MainActivity$loadqotd"></receiver>
</application>
...
我已经完成了警报管理器转储,并在其中找到了广播。但是,当警报管理器触发时,无论应用程序是在后台还是在应用程序中,都永远不会调用loadqotd。同样,它也不是由于构建错误或运行时异常引起的。
当您将嵌套类用作应用程序组件时(例如loadqotd
您的问题中的类),它必须是public static
。或者,您可以将其移动到单独的类文件,并相应地更新name
清单中的。
无论选择哪种方式,都需要在Receiver类中进行一些更改。你需要调用getSystemService()
的Context
传递到onReceive()
方法,因为它以前被称为在当前MainActivity
情况下,这将不再有机会获得。另外,您需要限定NOTIFICATION_SERVICE
常量。
NotificationManager notificationManager =
(NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
最后,因为要广播到接收方,而不是启动,所以PendingIntent
广播的警报必须是广播。更改为。PendingIntent
Service
getService()
getBroadcast()
PendingIntent pendingIntent = PendingIntent.getBroadcast(mContext, 0, alarmintent, 0);
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