java - 从服务获取 Activity 的小部件

Question

主要 Activity 有一个 AlarmManager，它每 X 分钟调用一次服务。我需要一种方法，使服务类中的方法可以更新主 Activity 中的 TextView，但我不知道如何获取服务中的 TextView 对象。有什么办法吗？

这是部分代码:

Intent myIntent = new Intent(MainActivity.this, MyAlarmService.class);
pintent = PendingIntent.getService(MainActivity.this, 0, myIntent, 0);

AlarmManager alarmManager = (AlarmManager)getSystemService(ALARM_SERVICE);
alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), 60000, pintent);

Answer 1

在您的警报服务中，您有一个 onReceive 方法

   public void onReceive(Context context, Intent arg1) {

        String data = "haha";
        if (data.isEmpty() == false && data.contentEquals("") == false) {

            nm = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
            CharSequence from = "sing";
            CharSequence message = data;
                   //get the activity
            PendingIntent contentIntent = PendingIntent.getActivity(context, 0,
                    new Intent(), 0);
            Notification notif = new Notification(R.drawable.icon,
                    data, System.currentTimeMillis());
            notif.defaults |= Notification.DEFAULT_SOUND;
            notif.setLatestEventInfo(context, from, message, contentIntent);
            nm.notify(1, notif);

        }

方法调用:

AlarmManager am = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
        Intent intent = new Intent(this, ReminderReceiverActivity.class);
        PendingIntent pendingIntent = PendingIntent.getBroadcast(this, 0,
                intent, PendingIntent.FLAG_CANCEL_CURRENT);

        am.setRepeating(AlarmManager.RTC_WAKEUP, System.currentTimeMillis(),
                100000, pendingIntent);
    }