Android中ExpandableListView的用法实例
本文实例讲述了Android中ExpandableListView的用法，ExpandableListView是android中可以实现下拉list的一个控件，具体的实现方法如下：
首先：在layout的xml文件中定义一个ExpandableListView
<LinearLayout
android:id="@+id/linearLayout"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
androidrientation="vertical"
>
<ExpandableListView
android:id="@+id/expandableListView"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
/>
</LinearLayout>
定义两个List，用来存放控件中Group/Child中的String
privateList<String>groupArray; privateList<List<String>>childArray;
对这两个List进行初始化，并插入一些数据
groupArray=newArrayList<String>();
childArray=newArrayList<List<String>>();
groupArray.add("第一行");
groupArray.add("第二行");
List<String>tempArray=newArrayList<String>();
tempArray.add("第一条");
tempArray.add("第二条");
tempArray.add("第三条");
for(intindex=0;index<groupArray.size();++index)
{
childArray.add(tempArray);
}
定义ExpandableListView的Adapter
//ExpandableListView的Adapter
publicclassExpandableAdapterextendsBaseExpandableListAdapter
{
Activityactivity;
publicExpandableAdapter(Activitya)
{
activity=a;
}
publicObjectgetChild(intgroupPosition,intchildPosition)
{
returnchildArray.get(groupPosition).get(childPosition);
}
publiclonggetChildId(intgroupPosition,intchildPosition)
{
returnchildPosition;
}
publicintgetChildrenCount(intgroupPosition)
{
returnchildArray.get(groupPosition).size();
}
publicViewgetChildView(intgroupPosition,intchildPosition,
booleanisLastChild,ViewconvertView,ViewGroupparent)
{
Stringstring=childArray.get(groupPosition).get(childPosition);
returngetGenericView(string);
}
//groupmethodstub
publicObjectgetGroup(intgroupPosition)
{
returngroupArray.get(groupPosition);
}
publicintgetGroupCount()
{
returngroupArray.size();
}
publiclonggetGroupId(intgroupPosition)
{
returngroupPosition;
}
publicViewgetGroupView(intgroupPosition,booleanisExpanded,
ViewconvertView,ViewGroupparent)
{
Stringstring=groupArray.get(groupPosition);
returngetGenericView(string);
}
//ViewstubtocreateGroup/Children'sView
publicTextViewgetGenericView(Stringstring)
{
//LayoutparametersfortheExpandableListView
AbsListView.LayoutParamslayoutParams=newAbsListView.LayoutParams(
ViewGroup.LayoutParams.FILL_PARENT,64);
TextViewtext=newTextView(activity);
text.setLayoutParams(layoutParams);
//Centerthetextvertically
text.setGravity(Gravity.CENTER_VERTICAL|Gravity.LEFT);
//Setthetextstartingposition
text.setPadding(36,0,0,0);
text.setText(string);
returntext;
}
publicbooleanhasStableIds()
{
returnfalse;
}
publicbooleanisChildSelectable(intgroupPosition,intchildPosition)
{
returntrue;
}
}
最后，给定义好的ExpandableListView添加上Adapter
ExpandableListViewexpandableListView=(ExpandableListView)findViewById(R.id.expandableListView); expandableListView.setAdapter(newExpandableAdapter(Main.this));
希望本文所述对大家的Android程序设计有所帮助。