方案一：动态计算ListView的item总高度

动态设置ListView的高度 ,该方法必须在listview设置了adapter之后调用

public static void setListViewHeightBasedOnChildren(ListView listView) {
    if(listView == null)
        return;

    ListAdapter listAdapter = (ListAdapter) listView.getAdapter();
    if (listAdapter == null) {
        return;
    }

    int totalHeight = 0;
    for (int i = 0; i < listAdapter.getCount(); i++) {
        View listItem = listAdapter.getView(i, null, listView);
        listItem.measure(50, 50);//置空，注意：这里的listview的子项的最大布局必须是LinearLayout布局
        totalHeight += listItem.getMeasuredHeight(); //循环得到listview的所有item高度的总和  
    }

    LinearLayout.LayoutParams params = (LinearLayout.LayoutParams) listView.getLayoutParams();
    params.height = totalHeight + (listView.getDividerHeight() * (listAdapter.getCount() - 1));
    listView.setLayoutParams(params);
}

方案二：重写ListView的onMeasure()方法

public class ExpandListView extends ListView {
   public ExpandListView(Context context) {
      super(context);
   }
   
   public ExpandListView(Context context, AttributeSet attrs) {
      super(context, attrs);
   }

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