ScrollView中嵌套GridView，ListView只顯示一行的解決辦法，scrollviewgridview

ScrollView中嵌套GridView，ListView只顯示一行的解決辦法，scrollviewgridview

轉載：http://blog.csdn.net/luohai859/article/details/39347583

關於為什麼只顯示一行，個人理解是:如果單獨使用GridView和ListView，裡面的內容是固定的，底層系統很容易計算出控制項要佔用的寬高，當外面嵌套一層ScrollView後，就能做上下或左右滑動，但能滑動多少系統不知道，這時就需要你給計算出一個滑動地區給ScrollView。而這個數值就是通過GridView和ListView中的內容總的寬高之和。有更精確的理解歡迎賜教。解決的辦法有兩種：

方法一：就是上面說的通過計算出來ListView或者GridView中的子列高度和 進行顯示：

public void setListViewHeightBasedOnChildren(ListView listView) {        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(0, 0);            totalHeight += listItem.getMeasuredHeight();        }          ViewGroup.LayoutParams params = listView.getLayoutParams();        params.height = totalHeight + (listView.getDividerHeight() * (listAdapter.getCount() - 1));        ((MarginLayoutParams)params).setMargins(15, 15, 15, 15);      listView.setLayoutParams(params);    }

方法二：重寫GridView和ListView的onMeasure方法，直接給它一個足夠大的高度：

重寫ListView:

public class MyListView extends ListView {        public MyListView(Context context) {          // TODO Auto-generated method stub          super(context);      }        public MyListView(Context context, AttributeSet attrs) {          // TODO Auto-generated method stub          super(context, attrs);      }        public MyListView(Context context, AttributeSet attrs, int defStyle) {          // TODO Auto-generated method stub          super(context, attrs, defStyle);      }        @Override      protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {          // TODO Auto-generated method stub          int expandSpec = MeasureSpec.makeMeasureSpec(Integer.MAX_VALUE >> 2,                  MeasureSpec.AT_MOST);          super.onMeasure(widthMeasureSpec, expandSpec);      }  }

重寫GridView:

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