Refresh progress bar in notification bar

问题:

I would like to put a progress bar in the notification bar. The idea is showing the progress bar while the program uploads a file to a server. Everything else is ok, but I can not figure out how to refresh the progress bar inside the notification. Does anybody knows any pattern to play with? I mean, where I should refresh the progress bar, in a service or activity and so.

回答1:

I don't know what your code looks like, so I don't know what you need to modify, butI did some searching through the documentation. I found some stuff on Notifications, ProgressBars, and RemoteViews.

Specifically, in RemoveView, you can update the Progress bar. So combining some of the example code in each link, I get something like this:

public class MyActivity extends Activity {
    private static final int PROGRESS = 0x1;
    private static final int MAX_PROGRESS = 100;

    private int mProgressStatus = 0;

    private Handler mHandler = new Handler();

    protected void onCreate(Bundle icicle) {
        super.onCreate(icicle);

        //define Notification
        //...

        RemoteViews contentView = new RemoteViews(getPackageName(), R.layout.custom_notification_layout);
        contentView.setProgressBar(R.id.progress_bar, MAX_PROGRESS, mProgressStatus, false);
        notification.contentView = contentView;

        // Start file upload in a background thread
        new Thread(new Runnable() {
            public void run() {
                while (mProgressStatus < MAX_PROGRESS) {
                    mProgressStatus = doWork();

                    // Update the progress bar
                    mHandler.post(new Runnable() {
                        public void run() {
                            contentView.setProgressBar(R.id.progress_bar, MAX_PROGRESS, mProgressStatus, false);
                        }
                    });
                }
            }
        }).start();
    }
}

回答2:

You can use custom views in Notification:
https://developer.android.com/guide/topics/ui/notifiers/notifications.html#CustomExpandedView

回答3:

To remove a ProgressBar from RemoteView use the following code :-

 remoteViews.setViewVisibility(R.id.progressBar, View.INVISIBLE);

You can also use View.GONE but that will make android to fill empty space.