有时候项目里面需要ScrollView嵌套ListView,但是正常下ListView只会显示一行多一点，解决方法就是填充ListView数据后重新计算ListView的高度，这里有两种方法来实现。

第一种方法：重写ListView

package com.jwzhangjie.test;

import android.content.Context;
import android.util.AttributeSet;
import android.widget.ListView;

public class MyListView extends ListView{

    public MyListView(Context context) {
        super(context);
    }
    public MyListView(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

        @Override
        protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
                int expandSpec = MeasureSpec.makeMeasureSpec(Integer.MAX_VALUE >> 2,
                                MeasureSpec.AT_MOST);
                super.onMeasure(widthMeasureSpec, expandSpec);
        }
}

第二种方法：添加完数据后计算ListView中所有Item的高度和间隔线的高度然后重新设置ListView的高度

public void setListViewHeightBasedOnChildren(ListView listView) {
        ListAdapter listAdapter = listView.getAdapter();
        if (listAdapter == null)
            return;
        if (listAdapter.getCount() <= 1)
            return;

        int totalHeight = 0;
        View view = null;
        for (int i = 0; i < listAdapter.getCount(); i++) {
            view = listAdapter.getView(i, null, listView);
            view.measure(0,0);
            totalHeight += view.getMeasuredHeight();
        }
        ViewGroup.LayoutParams params = listView.getLayoutParams();
        params.height = totalHeight
                + (listView.getDividerHeight() * (listAdapter.getCount() - 1));
        listView.setLayoutParams(params);
        listView.requestLayout();
    }

设置完数据后，调用setListViewHeightBasedOnChildren(listview);

注意：ListView的item只能使用LinearLayout包含