请教:仿照HTC One的缩略图，Widget没有显示,如何处理？

Question

缩略图的xml文件screens_editor.xml采用RelativeLayout，通过mDragLayer.addView(mScreensEditor);显示出来了。mScreensEditor=(ViewGroup)mInflater.inflate(R.layout.screens_editor, null);
mDragLayer.addView(mScreensEditor);//源码提供DragLayer extends FrameLayout
但widget缩略图采用下面方法(PagedViewGridLayout(launcher源码提供的)，widget类始终没有显示，请指教。for (int j = 0; j < mAppsCustomizeContent.NumOfWidgetPages(); ++j) {
            PagedViewGridLayout layout = new PagedViewGridLayout(getApplicationContext(), mAppsCustomizeContent.getWidgetCountX(),mAppsCustomizeContent.getWidgetCountY());
            mAppsCustomizeContent.setupPage(layout);
            
            mScreensEditor.addView(layout, new PagedViewGridLayout.LayoutParams(480,540));
}
mAppsCustomizeContent.invalidatePageData(mAppsCustomizeContent.NumOfWidgetPages(), true);
mDragLayer.addView(mScreensEditor);
htc缩略图addview