加载列表之前确定的ListView高度 [英] Determine ListView height before loading the list

问题描述

是否有可能确定一个ListView的高度，它是在屏幕上呈现前？如果我的ListView是有，说3项，高度，只限于这3项（和ListView控件不占用整个屏幕的高度），我能确定的高度Android版会显示在屏幕上的项目之前，<？ / p>

解决方案

使用下面的方法来获取和设置基于儿童present高度

 私有静态无效setListViewHeightBasedOnChildren（ListView控件iListView）{
        ListAdapter listAdapter = iListView.getAdapter（）;
        如果（listAdapter == NULL）
            返回;        INT desiredWidth = View.MeasureSpec.makeMeasureSpec（iListView.getWidth（），View.MeasureSpec.UNSPECIFIED）;
        INT totalHeight = 0;
        查看查看= NULL;
        的for（int i = 0; I＆LT; listAdapter.getCount（）;我++）{
            鉴于= listAdapter.getView（我认为，iListView）;
            如果（我== 0）
                view.setLayoutParams（新ViewGroup.LayoutParams（desiredWidth，RelativeLayout.LayoutParams.WRAP_CONTENT））;            view.measure（desiredWidth，View.MeasureSpec.UNSPECIFIED）;
            totalHeight + = view.getMeasuredHeight（）;
        }
        ViewGroup.LayoutParams PARAMS = iListView.getLayoutParams（）;
        params.height = totalHeight +（iListView.getDividerHeight（）*（listAdapter.getCount（） -  1））;
        Log.d（TAG，高度的ListView ---+ params.height）;
        iListView.setLayoutParams（PARAMS）;
        iListView.requestLayout（）;
    }
 

Is it possible to determine the height of a ListView before it is rendered on the screen? If my ListView were to have, say 3 items, and the height is confined to these 3 items (and the ListView doesn't take up the entire screen's height), can I determine the height before Android displays the items on the screen?

解决方案

Use the following method to get and set the height based upon children present

 private static void setListViewHeightBasedOnChildren(ListView iListView) {
        ListAdapter listAdapter = iListView.getAdapter();
        if (listAdapter == null)
            return;

        int desiredWidth = View.MeasureSpec.makeMeasureSpec(iListView.getWidth(), View.MeasureSpec.UNSPECIFIED);
        int totalHeight = 0;
        View view = null;
        for (int i = 0; i < listAdapter.getCount(); i++) {
            view = listAdapter.getView(i, view, iListView);
            if (i == 0)
                view.setLayoutParams(new ViewGroup.LayoutParams(desiredWidth, RelativeLayout.LayoutParams.WRAP_CONTENT));

            view.measure(desiredWidth, View.MeasureSpec.UNSPECIFIED);
            totalHeight += view.getMeasuredHeight();
        }
        ViewGroup.LayoutParams params = iListView.getLayoutParams();
        params.height = totalHeight + (iListView.getDividerHeight() * (listAdapter.getCount() - 1));
        Log.d("TAG", "ListView Height --- "+params.height);
        iListView.setLayoutParams(params);
        iListView.requestLayout();
    }

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