android-基础编程-ExpandableListview
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内容图文
ExpandableListView继承ListView，具有LIstVIew的基本功能。此外具有group/child，由组与子元素组成。
1.布局主要有是三个。
a.主布局：
<
ExpandableListView
android:layout_width
="match_parent"
android:layout_height
="match_parent"
android:id
="@+id/expandlistview"
android:dividerHeight
="5dp"
android:background
="#ffffff"
android:divider
="@drawable/expandchilddivide"
android:childDivider
="#000000"
/>
b.Group布局：
<
LinearLayout
xmlns:android
="http://schemas.android.com/apk/res/android"
android:layout_width
="match_parent"
android:layout_height
="wrap_content"
android:gravity
="center"
android:orientation
="vertical"
>
<
TextView
android:id
="@+id/group_text"
android:layout_width
="match_parent"
android:layout_height
="wrap_content"
android:paddingTop
="10dip"
android:paddingBottom
="10dip"
android:gravity
="center_horizontal"
android:text
="122"
/>
</
LinearLayout
>
c.Child布局：
<
LinearLayout
xmlns:android
="http://schemas.android.com/apk/res/android"
android:layout_width
="match_parent"
android:layout_height
="match_parent"
android:orientation
="horizontal"
>
<
LinearLayout
android:layout_width
="match_parent"
android:layout_height
="wrap_content"
android:orientation
="vertical"
>
<
TextView
android:id
="@+id/textOne"
android:layout_width
="match_parent"
android:layout_height
="match_parent"
android:text
="1"
/>
<
TextView
android:id
="@+id/textTwo"
android:layout_width
="match_parent"
android:layout_height
="match_parent"
android:text
="2"
/>
<
TextView
android:id
="@+id/textThree"
android:layout_width
="match_parent"
android:layout_height
="match_parent"
android:text
="3"
/>
</
LinearLayout
>
</
LinearLayout
>
2.代码生成 类似adapter 创建adapter（ExpandableListAdapter、BaseExpandableListAdapter、SimpleExpandableListAdapter 依次继承关系）
a.创建adapter
//
自定义适配器
class Adapter extends BaseExpandableListAdapter {
//获取子元素对象 @Override
public Object getChild(int groupPosition, int childPosition) {
returnnull;
}
//获取子元素Id @Override
publiclong getChildId(int groupPosition, int childPosition) {
return childPosition;
}
//加载子元素并显示 @Override
public View getChildView(finalint groupPosition, finalint childPosition,
boolean isLastChild, View convertView, ViewGroup parent) {
View view = null;
ChildHolder childholder = null;
if (convertView != null) {
view = convertView;
childholder = (ChildHolder) view.getTag();
} else {
view = View.inflate(ExpandableListViewActi.this, R.layout.expand_child, null);
childholder = new ChildHolder();
//childholder.mImage = (ImageView) view.findViewById(R.id.image);
childholder.mPrice = (TextView) view.findViewById(R.id.textTwo);
childholder.mStateText = (TextView) view.findViewById(R.id.textOne);
childholder.mSecondPrice = (TextView) view.findViewById(R.id.textThree);
view.setTag(childholder);
}
// childholder.mImage.setOnClickListener(new OnClickListener() {
// @Override
// public void onClick(View v) {
// Toast.makeText(MainActivity.this, "第"+groupPosition+"组的第"+childPosition+"圖標被点击了", 0).show();
// }
// }); childholder.mPrice.setText(child_list.get(groupPosition));
int len = group_list.size();
System.out.println(len + "-----------------");
childholder.mStateText.setText(child_list.get(groupPosition));
childholder.mSecondPrice.setText(child_list.get(groupPosition));
return view;
}
//获取子元素数目 @Override
publicint getChildrenCount(int groupPosition) {
return child_list.size();
}
//获取组元素对象 @Override
public Object getGroup(int groupPosition) {
return group_list.get(groupPosition);
}
//获取组元素数目 @Override
publicint getGroupCount() {
return group_list.size();
}
//获取组元素Id @Override
publiclong getGroupId(int groupPosition) {
return groupPosition;
}
//加载并显示组元素 @Override
public View getGroupView(int groupPosition, boolean isExpanded,
View convertView, ViewGroup parent) {
View view = null;
GroupHolder groupholder = null;
if (convertView != null) {
view = convertView;
groupholder = (GroupHolder) view.getTag();
} else {
view = View.inflate(ExpandableListViewActi.this, R.layout.expand_group, null);
groupholder = new GroupHolder();
groupholder.mSpaceText = (TextView) view.findViewById(R.id.group_text);
view.setTag(groupholder);
}
groupholder.mSpaceText.setText(group_list.get(groupPosition));
return view;
}
@Override
publicboolean hasStableIds() {
returntrue;
}
@Override
publicboolean isChildSelectable(int groupPosition, int childPosition) {
returntrue;
}
}
b.生成主界面代码，设置adapter .expandable四中点击相应事件。
private
void
initView() {
mListView = (ExpandableListView) findViewById(R.id.expandlistview);
mInflater = LayoutInflater.from(ExpandableListViewActi.this);
group_list = new ArrayList<String>();
for (int i = 0; i < 5; i++) {
group_list.add("zcx");
child_list.add("child");
}
Adapter adapter = new Adapter();
//mListView.setGroupIndicator(null);/**
* ExpandableListView的组监听事件
*/// mListView.setOnGroupClickListener(new ExpandableListView.OnGroupClickListener() {
//// @Override
// public boolean onGroupClick(ExpandableListView parent, View v,
// int groupPosition, long id) {
// Toast.makeText(ExpandableListViewActi.this, "第" + groupPosition + "组被点击了", 0).show();
// return true;
// }
// });/**
* ExpandableListView的组展开监听
*/
mListView.setOnGroupExpandListener(new ExpandableListView.OnGroupExpandListener() {
@Override
publicvoid onGroupExpand(int groupPosition) {
Toast.makeText(ExpandableListViewActi.this, "第" + groupPosition + "组展开", 0).show();
}
});
/**
* ExpandableListView的组合拢监听
*/
mListView.setOnGroupCollapseListener(new ExpandableListView.OnGroupCollapseListener() {
@Override
publicvoid onGroupCollapse(int groupPosition) {
Toast.makeText(ExpandableListViewActi.this, "第" + groupPosition + "组合拢", 0).show();
}
});
/**
* ExpandableListView的子元素点击监听
*/
mListView.setOnChildClickListener(new ExpandableListView.OnChildClickListener() {
@Override
publicboolean onChildClick(ExpandableListView parent, View v,
int groupPosition, int childPosition, long id) {
Toast.makeText(ExpandableListViewActi.this, "第" + groupPosition + "组的第" + childPosition + "被点击了", 0).show();
returntrue;
}
});
mListView.setAdapter(adapter);
// int groupCount = mListView.getCount();
// for(int i=0;i<groupCount;i++){
// mListView.expandGroup(i);
// }
}
3.效果图
原文：http://www.cnblogs.com/zCoderJoy/p/6942391.html
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