ScrollView中嵌套ListView、 GridView，ListView、GridView都显示不全，网上有很多解决办法，本菜鸟学习后，总结了一下，望轻喷。。。。
首先ListView，一般有两种解决办法，
方法一：重新计算出ListView的高度，代码如下
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import android.view.View;
import android.view.ViewGroup;
import android.widget.ListAdapter;
import android.widget.ListView;
public class ListViewUtility {
public static void setListViewHeightBasedOnChildren(ListView listView) {
//获取ListView对应的Adapter
ListAdapter listAdapter = listView.getAdapter();
if (listAdapter == null) {
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);
}
}
调用ListView此类的静态方法就OK了
此方法有很大的缺陷，要求ListView的子项必须是线型布局，所以不实用。
方法二：重写ListView的onMeasure方法代码如下：
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import android.content.Context;
import android.util.AttributeSet;
import android.view.View.MeasureSpec;
import android.widget.ListView;
public class MyListView extends ListView{
public MyListView(Context context) {
super(context);
// TODO Auto-generated constructor stub
}
public MyListView(Context context, AttributeSet attrs) {
super(context, attrs);
// TODO Auto-generated constructor stub
}
public MyListView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
// TODO Auto-generated constructor stub
}
@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);
}
}
华丽丽的分割线
GridView也是重写onMeasure方法好用贴出代码
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import android.content.Context;
import android.util.AttributeSet;
import android.widget.GridView;
public class MyGridView extends GridView {
public MyGridView(Context context) {
super(context);
// TODO Auto-generated constructor stub
}
public MyGridView(Context context, AttributeSet attrs) {
super(context, attrs);
// TODO Auto-generated constructor stub
}
public MyGridView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
// TODO Auto-generated constructor stub
}
@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);
}
}
其实重写ListView和GridView的代码一样，暂时没有具体研究是怎么实现的，希望大神解 答。
