Question

你好我有一个listview包含很多项目，但只有3项可见，我想在滚动列表后更改中间项目的背景颜色

我的Activity实现了AbsListView.OnScrollListener，我有2种覆盖方法，如下所示

@Override
public void onScrollStateChanged(AbsListView view, int scrollState) {

}

@Override
public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {

    int firstVisibleRow = AccountList.getFirstVisiblePosition();
    int lastVisibleRow = AccountList.getLastVisiblePosition();
    int middleone = firstVisibleRow+1;

        Account test = (Account) AccountList.getItemAtPosition(middleone);
       // test is the item in the middle of listview 

        Log.i("", "" + middleone + "=" + test.getDescription());
}

我创建了Account列表和Account列表的适配器帐户测试是中间项目

我觉得我很重要现在我想将背景颜色设置为此行“test”

请任何帮助，希望我的问题清楚谢谢所有

Answer 1

首先，谢谢大家

最后我发现我的解决方案是

  @Override
public void onScrollStateChanged(AbsListView view, int scrollState) {
    wantedView.setBackgroundResource(R.drawable.background_shape);//or color but set background 
}

@Override
public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {

    int middlePosition = AccountList.getFirstVisiblePosition()+1;
    int firstPosition = AccountList.getFirstVisiblePosition() - AccountList.getHeaderViewsCount();
    int middleChild = middlePosition - firstPosition;

    if (middleChild < 0 || middleChild >= AccountList.getChildCount()) {
        Log.w("TAG", " Unable to get view for desired position, because its not being displayed on screen");
        return;
    }
    middleView = AccountList.getChildAt(middleChild);
    middleView.setBackgroundColor(Color.WHITE);



}

祝所有人好运:)

Answer 2

使[int middleone]成为一个全局变量（在onCreate（）之前声明它）

而不是使用此代码：

 @Override
public void onScrollStateChanged(AbsListView view, int scrollState) {
    AccountList.get(middleone).setBackgroundColor(YOURCOLOR);
}

Answer 3

这是完成这个技巧的代码，

list.setOnScrollListener(new OnScrollListener() {

        @Override
        public void onScrollStateChanged(AbsListView arg0, int arg1) {
            // TODO Auto-generated method stub
            int pos = list.getFirstVisiblePosition();               
            LinearLayout layout = (LinearLayout) list.findViewWithTag(pos++);
            layout.setBackgroundColor(Color.GREEN);
            Log.v("inside", "inside" + layout.toString());

        }

        @Override
        public void onScroll(AbsListView a,int arg1,int arg2,int arg3){
            // TODO Auto-generated method stub

        }
    });

，getView看起来像，

if(convertView==null){
LayoutInflater inflater =  LayoutInflater.from(getApplicationContext());
            convertView = inflater.inflate(R.layout.layout, null);
            holder = new ViewHolder(convertView);
            convertView.setTag(holder);
        }else{
            holder = (ViewHolder) convertView.getTag();
        }

        holder.linear.setTag(position);
        holder.tv1.setText(s[position]);
        holder.tv2.setText(s1[position]);

请注意，我最后遇到了ClassCastException，但这是要走的路。当你找到方法时，请告诉我。

更改ListView onscroll中项目的背景颜色？

3 个答案: