后台下载自定义状态栏通知 [英] Custom status bar notification for background download

问题描述

我是新android开发，我试图创建我的应用程序后台下载功能。我跟着这个的http://developer.android.com/guide/topics/ui/notifiers/notifications.html#CustomExpandedView创建我的自定义通知。

I am new to android development and I try to create a background download feature for my app. I followed this http://developer.android.com/guide/topics/ui/notifiers/notifications.html#CustomExpandedView to create my custom notification.

在下载完成，我检查下载的文件的SD卡。此外，状态栏图标和标题适当改变。

The downloading is performed, I checked the downloaded file in the sdcard. Also,the status bar icon and title are changed properly.

的问题是，自定义布局我提供该通知不会出现（横条下展开）这是私人的AsyncTask类中的相关code部分：

The problem is that the custom layout I provide for the notification does not appear (expand under the bar). Here is the related code parts inside private AsyncTask class:

    @Override
    protected void onPreExecute() {
        // create and configure the notification
        notification = new Notification(R.drawable.download, "Downloading map..", System.currentTimeMillis());
        notification.flags = notification.flags | Notification.FLAG_ONGOING_EVENT;

        //create a custom layout for the notification
        myContentView = new RemoteViews(appContext.getPackageName(), R.layout.download_progress);
        myContentView.setImageViewResource(R.id.status_icon, R.drawable.ic_menu_save);
        myContentView.setTextViewText(R.id.status_text, "download in progress");
        myContentView.setProgressBar(R.id.status_progress, 100, 0, false);
        notification.contentView = myContentView;
        notification.contentView.apply(appContext, dl.getListView());

        //instantiate the pending intent
        Intent myIntent = new Intent(appContext, DownloadList.class);
        myIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        int requestID = (int) System.currentTimeMillis();
        PendingIntent myPendingIntent = PendingIntent.getActivity(appContext, requestID, myIntent, 0);
        notification.contentIntent = myPendingIntent;

        //add the Notification object to the notification manager
        notificationManager = (NotificationManager) appContext.getSystemService(Context.NOTIFICATION_SERVICE);
        notificationManager.notify(NOTIF_ID, notification);
    }

    @Override
    protected void onProgressUpdate(Integer... progress) {
        //update progress bar
        notification.contentView.setProgressBar(R.id.status_progress, 100, progress[0], false);
        notificationManager.notify(NOTIF_ID, notification);
    }

}

请注意我的downloadlist类扩展ListActivity。

Note that my DownloadList class extends ListActivity.

我需要做更多的事情，只是notification.contentView = myContentView;为了膨胀的布局？

Do I need to do something more that just "notification.contentView = myContentView;" in order to inflate the layout?

推荐答案

这是一个模拟器的问题毕竟.....

It was an emulator problem after all.....

它落后时，我拖累的通知！我杀导致以更快的仿真器在我的电脑上的一些CPU广泛的进程。

It lagged when I "dragged down" the notification! I killed some CPU extensive processes on my PC resulting to a faster emulator.

经验教训。离开沉重的多任务处理的优点或到另一台PC。

Lesson learned. Leave the heavy multitasking to pros or to another PC.

这篇关于后台下载自定义状态栏通知的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！