更新通知区域中的进度条

Question

关于如何在通知栏中进行自定义布局,已经有几个主题.问题是我必须遗漏一些简单的东西.

我有一个custom_notification_layout.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
              android:orientation="vertical"
              android:layout_width="fill_parent"
              android:layout_height="fill_parent"
              android:padding="3dip"
              >

    <TextView android:id="@+id/text"
              android:text="Uploading"
              android:layout_width="wrap_content"
              android:layout_height="wrap_content"
              android:textColor="#000"
              />

    <ProgressBar  
            style="?android:attr/progressBarStyleHorizontal" 
            android:layout_height="wrap_content" 
            android:layout_width="fill_parent"
            android:max="0" 
            android:progress="0"   
            android:layout_marginLeft="10dip"  
            android:id="@+id/progressBar" 
            />  
</LinearLayout>

我还有一些创建通知的测试代码,它可以工作并显示进度条.

NotificationManager mManager = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
Notification notification = new Notification(R.drawable.icon, title, System.currentTimeMillis());
RemoteViews contentView = new RemoteViews(context.getPackageName(), R.layout.custom_notification_layout);
contentView.setProgressBar(R.id.progressBar, 10, 0, false);        
contentView.setTextViewText(R.id.text, text);       
notification.contentView = contentView;

Intent notificationIntent = new Intent(context, NotificationHandler.class);
PendingIntent contentIntent = PendingIntent.getActivity(context, 0, notificationIntent, 0);
notification.contentIntent = contentIntent;
mManager.notify(APPID, notification);

最后我尝试更新进度条,这不起作用.

contentView.setProgressBar(R.id.progressBar, 10, 5, false); 

实际更新通知的秘诀是什么？

Answer 1

你应该添加这两行:

// update the notification object
notification.contentView.setProgressBar(R.id.progressBar, 10, 5, false);
// notify the notification manager on the update.
mManager.notify(APPID, notification);

Answer 2

切记不要经常通知状态栏.如果您在内部使用该代码(例如,AsyncTask的onProgressUpdate)并且您通知每个进度,您将虚拟地阻止状态栏.仅在有变化时通知.