转载：http://blog.csdn.net/luohai859/article/details/39347583
关于为什么只显示一行，个人理解是:如果单独使用GridView和ListView，里面的内容是固定的，底层系统很容易计算出控件要占用的宽高，当外面嵌套一层ScrollView后，就能做上下或左右滑动，但能滑动多少系统不知道，这时就需要你给计算出一个滑动区域给ScrollView。而这个数值就是通过GridView和ListView中的内容总的宽高之和。有更精确的理解欢迎赐教。解决的办法有两种：
方法一：就是上面说的通过计算出来ListView或者GridView中的子列高度和 进行显示：
public void setListViewHeightBasedOnChildren(ListView listView) {
ListAdapter listAdapter = listView.getAdapter();
if (listAdapter == null) {
return;
}
int totalHeight = ;
for (int i = ; i < listAdapter.getCount(); i++) {
View listItem = listAdapter.getView(i, null, listView);
listItem.measure(, );
totalHeight += listItem.getMeasuredHeight();
}
ViewGroup.LayoutParams params = listView.getLayoutParams();
params.height = totalHeight + (listView.getDividerHeight() * (listAdapter.getCount() - ));
((MarginLayoutParams)params).setMargins(, , , );
listView.setLayoutParams(params);
}
方法二：重写GridView和ListView的onMeasure方法，直接给它一个足够大的高度：
重写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 >> ,
MeasureSpec.AT_MOST);
super.onMeasure(widthMeasureSpec, expandSpec);
}
}
重写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 >> ,
MeasureSpec.AT_MOST);
super.onMeasure(widthMeasureSpec, expandSpec);
}
}