android - Refresh progress bar in notification bar

Question

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.

Answer 1

我不知道你的代码是什么样的，所以我不知道你需要修改什么，但我通过文档进行了一些搜索。我在Notifications、ProgressBars和RemoteViews上找到了一些东西。

具体来说，在 RemoveView 中，您可以更新进度条。因此，结合每个链接中的一些示例代码，我得到如下内容：

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();
    }
}

Answer 2

您可以在通知中使用自定义视图：
https ://developer.android.com/guide/topics/ui/notifiers/notifications.html#CustomExpandedView

Answer 3

要从 RemoteView 中删除 ProgressBar，请使用以下代码：-

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

您也可以使用View.GONE，但这会使 android 填补空白。