ScrollView嵌套ListView问题解决方案

素颜马尾好姑娘i 2022-07-13 14:57 199阅读 0赞

# 两种方案 #

## 1.根据item计算listView高度 ##

两个方法，第一个是计算竖向listview，第二个计算横向lisTVIEW

public class ListViewMeasureHeight {
      /**
       * 测量竖向ListView的高度
       */
      public static void setListViewHeight(ListView listView,int DividerHeight) {
        Adapter listAdapter = listView.getAdapter();
    
        if (listAdapter == null) {
          // pre-condition
          return;
        }
    
        int totalHeight = 0;
        for (int i = 0; i < listAdapter.getCount(); i++) {
          View listItem = listAdapter.getView(i, null, listView);
          listItem.measure(0, 0);
          totalHeight += listItem.getMeasuredHeight();
        }
    
        ViewGroup.LayoutParams params = listView.getLayoutParams();
        params.height = totalHeight + (DividerHeight * (listAdapter.getCount() - 1));
        listView.setLayoutParams(params);
      }
      /**
       * 测量横向ListView的高度
       * @param listView
       */
      public static void setHorizontalListViewHeight(HorizontalListView listView) {
        Adapter listAdapter = listView.getAdapter();
    
        if (listAdapter == null) {
          // pre-condition
          return;
        }
        View listItem = listAdapter.getView(0, null, listView);
        listItem.measure(0, 0);
        int totalHeight = listItem.getMeasuredHeight();
    
        ViewGroup.LayoutParams params = listView.getLayoutParams();
        params.height = totalHeight;
        listView.setLayoutParams(params);
      }
    }

子ListView的每个Item必须是LinearLayout，不能是其他的，因为其他的Layout(如RelativeLayout)没有重写onMeasure()，所以会在onMeasure()时抛出异常。

## 2。重写onMeasure（）方法 ##

public class NewListView extends ListView {
    
      public SpreadListView(Context context) {
        super(context);
      }
    
      public SpreadListView(Context context, AttributeSet attrs) {
        super(context, attrs);
      }
    
      public SpreadListView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
      }
    
      @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        int expandSpec = MeasureSpec.makeMeasureSpec(Integer.MAX_VALUE >> 2, MeasureSpec.AT_MOST);
        super.onMeasure(widthMeasureSpec, expandSpec);
      }
    }