原文地址:http://blog.csdn.net/cs_li1126/article/details/12906203
一.使用网上用的动态改变listview高度的方法,该方法只适用于item布局是LinearLayout布局的情况,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。所以使用限制较大。
[java] view plaincopy
- public class Utility {
- 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.网上有帖子说在ScrollView中添加一属性 android:fillViewport="true" ,这样就可以让ListView全屏显示了。在我机器上测试失败了。
三:重写ListView、gridView(推荐)
重写ListView:
[java] view plaincopy
- 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);
- }
- }
重写GridView:
[java] view plaincopy
- /**
- *自定义gridview,解决ScrollView中嵌套gridview显示不正常的问题(1行)
- */
- 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);
- }
- }
解决ScrollView下嵌套ListView、GridView显示不全的问题(冲突)
时间: 2024-10-26 09:44:32