Question

我在scrollview中使用listview，当listview到达底部时添加新项目。一切都工作得很好但是在添加/从服务器获取新项目时（在显示列表中的那些之前）应用程序正在卡车一段时间。我正在使用AsyncHttpClient库从服务器获取数据。

我正在设置适配器，

if(adapter == null) {
                adapter = new NetworkAdapter(activity, fragmentManager, R.layout.lv_network_custom_row, networkDataArrayList);
                lvNetwork.setAdapter(adapter);
                Log.d("network_response","adapter set");
            }
            else {
                adapter.notifyDataSetChanged();
                Log.d("network_response","adapter notify");
            }

据我所知，我一次创建适配器对象，后来只是通知更改。此外，我保留其先前的职位，

int index = lvNetwork.getFirstVisiblePosition();
            View v = lvNetwork.getChildAt(0);
            int top = (v == null) ? 0 : v.getTop();
lvNetwork.setSelectionFromTop(index, top);

我还需要动态设置listview高度，我这样做，

ListAdapter myListAdapter = listView.getAdapter();

    if (myListAdapter == null) {
        return;
    }

    int totalHeight = 0;
    for (int size = 0; size < myListAdapter.getCount(); size++) {

        View listItem = myListAdapter.getView(size, null, listView);
        if (listItem instanceof ViewGroup)
            listItem.setLayoutParams(new RelativeLayout.LayoutParams(
                    RelativeLayout.LayoutParams.WRAP_CONTENT,
                    RelativeLayout.LayoutParams.WRAP_CONTENT));

        WindowManager wm = (WindowManager) context
                .getSystemService(Context.WINDOW_SERVICE);
        Display display = wm.getDefaultDisplay();
        @SuppressWarnings("deprecation")
        int screenWidth = display.getWidth();
        int listViewWidth = screenWidth - 65;
        int widthSpec = View.MeasureSpec.makeMeasureSpec(listViewWidth,
                View.MeasureSpec.AT_MOST);
        listItem.measure(widthSpec, 0);

        totalHeight += listItem.getMeasuredHeight();

        listTotalHeight = totalHeight;
    }

    ViewGroup.LayoutParams params = listView.getLayoutParams();
    params.height = totalHeight
            + (listView.getDividerHeight() * (myListAdapter.getCount()));
    listView.setLayoutParams(params);
    listView.requestLayout();

我调试了代码，我猜设置listview高度时卡住了。

我想要的是，app / UI在显示新添加的项目之前不会卡住。我怎么解决这个问题？任何建议将不胜感激。

将新项目添加到listview时，Android listview / UI会卡住

0 个答案: