(转)解决ScrollView嵌套ListView或者GridView导致只显示一行的方法

即动态获取ListView和GridView的高度

一、对于ListView

ListView listview= new ListView(this);

setListViewHeightBasedOnChildren(listview);即可

public static void setListViewHeightBasedOnChildren(ListView listView) {
                    // 获取ListView对应的Adapter
                    ListAdapter listAdapter = listView.getAdapter();
                    if (listAdapter == null) {
                            // pre-condition
                            return;
                    }
      
                    int totalHeight = 0;
                    for (int i = 0, len = listAdapter.getCount(); i < len; i++) { // listAdapter.getCount()返回数据项的数目
                            View listItem = listAdapter.getView(i, null, listView);
                            listItem.measure(0, 0); // 计算子项View 的宽高
                            totalHeight += listItem.getMeasuredHeight(); // 统计所有子项的总高度
                    }
      
                    ViewGroup.LayoutParams params = listView.getLayoutParams();
                    params.height = totalHeight
                                    + (listView.getDividerHeight() * (listAdapter.getCount() - 1));
                    // listView.getDividerHeight()获取子项间分隔符占用的高度
                    // params.height最后得到整个ListView完整显示需要的高度
                    listView.setLayoutParams(params);
            }

 

二、对于GridView

GridView gridview = new GridView(this);

setGridViewHeightBasedOnChildren(gridview );即可

public static void setGridViewHeightBasedOnChildren(GridView gridView) {
                    // 获取GridView对应的Adapter
                    ListAdapter listAdapter = gridView.getAdapter();
                    if (listAdapter == null) {
                            return;
                    }
                    int rows;
                    int columns=0;
                    int horizontalBorderHeight=0;
                    Class<?> clazz=gridView.getClass();
                    try {
                            //利用反射，取得每行显示的个数
                            Field column=clazz.getDeclaredField("mRequestedNumColumns");
                            column.setAccessible(true);
                            columns=(Integer)column.get(gridView);
                            //利用反射，取得横向分割线高度
                            Field horizontalSpacing=clazz.getDeclaredField("mRequestedHorizontalSpacing");
                            horizontalSpacing.setAccessible(true);
                            horizontalBorderHeight=(Integer)horizontalSpacing.get(gridView);
                    } catch (Exception e) {
                            // TODO: handle exception
                            e.printStackTrace();
                    }
                    //判断数据总数除以每行个数是否整除。不能整除代表有多余，需要加一行
                    if(listAdapter.getCount()%columns>0){
                            rows=listAdapter.getCount()/columns+1;
                    }else {
                            rows=listAdapter.getCount()/columns;
                    }
                    int totalHeight = 0;
                    for (int i = 0; i < rows; i++) { //只计算每项高度*行数
                            View listItem = listAdapter.getView(i, null, gridView);
                            listItem.measure(0, 0); // 计算子项View 的宽高
                            totalHeight += listItem.getMeasuredHeight(); // 统计所有子项的总高度
                    }
                    ViewGroup.LayoutParams params = gridView.getLayoutParams();
                    params.height = totalHeight+horizontalBorderHeight*(rows-1);//最后加上分割线总高度
                    gridView.setLayoutParams(params);
            }