Android RemoteViews ListView 滚动

我正在尝试滚动ListView到某个特定位置AppWidget.

然而它没有做任何事情，我也尝试过设置位置方法但不起作用。

也没有错误或堆栈跟踪。

Code:

                    if (list.size() == 0) {
                        loadLayout(R.layout.rooster_widget_header);
                        views.addView(R.id.header_container,
                                views);
                    } else {
                        views.setRemoteAdapter(R.id.lvWidget, svcIntent);
                        views.setScrollPosition(R.id.lvWidget, 3);
                    }

Issue: ListView在显示之前没有任何子项。因此调用setScrollPosition设置adpater后没有效果。以下是代码中绝对列表视图这会检查：

final int childCount = getChildCount();
if (childCount == 0) {
    // Can't scroll without children.
    return;
}

Solution: 理想情况下我会使用ViewTreeObserver.OnGlobalLayoutListener用于设置ListView滚动位置，但在远程视图的情况下这是不可能的。设置滚动位置并调用partiallyUpdateAppWidget在可运行的情况下有一些延迟。我修改了Android天气小部件代码并分享在git hub.

public class MyWidgetProvider extends AppWidgetProvider {

    private static HandlerThread sWorkerThread;
    private static Handler sWorkerQueue;

    public MyWidgetProvider() {
        // Start the worker thread
        sWorkerThread = new HandlerThread("MyWidgetProvider-worker");
        sWorkerThread.start();
        sWorkerQueue = new Handler(sWorkerThread.getLooper());
    }

    public void onUpdate(Context context, final AppWidgetManager appWidgetManager, int[] appWidgetIds) {
        for (int i = 0; i < appWidgetIds.length; ++i) {
            ...
            final RemoteViews views = new RemoteViews(context.getPackageName(), R.layout.widget_layout);
            views.setRemoteAdapter(R.id.lvWidget, svcIntent);

            sWorkerQueue.postDelayed(new Runnable() {

                @Override
                public void run() {
                    // TODO Auto-generated method stub
                    views.setScrollPosition(R.id.list, 3);
                    appWidgetManager.partiallyUpdateAppWidget(appWidgetIds[i], views);
                }

            }, 1000);

            appWidgetManager.updateAppWidget(appWidgetIds[i], views);
            ...
        }
    }
}

这是屏幕记录。它滚动到第 5 个位置。