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Android-用ListView模仿ExpandableListView
转载请注明出处：http://blog.csdn.net/goldenfish1919/article/details/38334995
既然有现成的ExpandableListView，为啥还非得仿一个啊？是不是脱裤子放屁多此一举呢？当然不是的。ExpandableListView只能支持两层啊，假如你想支持三层或者更多层呢？或者说页面结构比较复杂，就像这样的：
用原生的ExpandableListView还真是不太好实现，也不是说不能，看上去有点复杂啊。ListView的adapter有一个getItemViewType()和getViewTypeCount()这么两个方法，挺好用的，我们来试下。
MainActivity.java:
public class MainActivity extends Activity {
private ListViewAdapter listViewAdapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//数据
List<GroupBean> itemList = getListData();
//view和adapter
ListView listView = (ListView)findViewById(R.id.listview);
listViewAdapter = new ListViewAdapter(this, itemList);
//给adapter设置监听
listViewAdapter.setGroupListener(new OnGroupClickListener(){
@Override
public void onGroupClicked(GroupView view, GroupBean group,int position) {
Toast.makeText(MainActivity.this, "I am "+ group.getName(), Toast.LENGTH_SHORT).show();
}
});
listViewAdapter.setChildListener(new OnChildClickListener(){
@Override
public void onChildClicked(ChildView view, ChildBean child,int position) {
Toast.makeText(MainActivity.this, "I am "+ child.getName(), Toast.LENGTH_SHORT).show();
}
});
listView.setAdapter(listViewAdapter);
}
@Override
protected void onDestroy() {
if(listViewAdapter != null){
listViewAdapter.destroy();
listViewAdapter = null;
}
super.onDestroy();
}
private static interface OnGroupClickListener{
public void onGroupClicked(GroupView view, GroupBean group, int position);
}
private static interface OnChildClickListener{
public void onChildClicked(ChildView view, ChildBean child, int position);
}
private static class ListViewAdapter extends BaseAdapter{
private static final int VIEW_TYPE_GROUP = 0;
private static final int VIEW_TYPE_CHILD = 1;
private Context context;
private List<GroupBean> groupList;
private OnGroupClickListener groupListener;
private OnChildClickListener childListener;
public ListViewAdapter(Context context, List<GroupBean> groupList){
this.context = context;
this.groupList = groupList;
}
@Override
public int getCount() {
if(groupList == null || groupList.size() <= 0){
return 0;
}
int count = 0;
for(GroupBean group : groupList){
count ++;
List<ChildBean> childList = group.getChildList();
if(childList == null){
continue;
}
if(group.isExpand()){
count += childList.size();
}
}
return count;
}
@Override
public Object getItem(int index) {
if(groupList == null || groupList.size() <= 0){
return null;
}
int count = 0 ;
for(int i=0;i<groupList.size();i++){
GroupBean group = groupList.get(i);
if(index == count){
return group;
}
count++;
if(!group.isExpand()){
continue;
}
List<ChildBean> childList = group.getChildList();
if(childList == null){
continue;
}
for(int j=0;j<childList.size();j++){
ChildBean child = childList.get(j);
if(index == count){
return child;
}
count++;
}
}
return null;
}
@Override
public long getItemId(int itemid) {
return itemid;
}
@Override
public View getView(final int position, View convertView, ViewGroup parent) {
ViewHolder holder = null;
if(convertView == null){
holder = new ViewHolder();
int type = getItemViewType(position);
if(type == VIEW_TYPE_GROUP){
convertView = new GroupView(context, parent);
holder.groupView = (GroupView)convertView;
}else{
convertView = new ChildView(context, parent);
holder.childView = (ChildView)convertView;
}
convertView.setTag(holder);
}else{
holder = (ViewHolder)convertView.getTag();
}
int type = getItemViewType(position);
if(type == VIEW_TYPE_GROUP){
final GroupView groupView = holder.groupView;
final GroupBean groupBean = (GroupBean)getItem(position);
groupView.setName(groupBean.getName());
groupView.setExpand(groupBean.isExpand());
groupView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
groupBean.setExpand(!groupBean.isExpand());
notifyDataSetChanged();
if(groupListener != null){
groupListener.onGroupClicked(groupView, groupBean, position);
}
}
});
return groupView;
}else{
final ChildView childView = holder.childView;
final ChildBean childBean = (ChildBean)getItem(position);
childView.setName(childBean.getName());
childView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if(childListener != null){
childListener.onChildClicked(childView, childBean, position);
}
}
});
return childView;
}
}
@Override
public int getItemViewType(int position) {
Object item = getItem(position);
if(item instanceof GroupBean){
return VIEW_TYPE_GROUP;
}else{
return VIEW_TYPE_CHILD;
}
}
@Override
public int getViewTypeCount() {
return 2;
}
public void setGroupListener(OnGroupClickListener groupListener) {
this.groupListener = groupListener;
}
public void setChildListener(OnChildClickListener childListener) {
this.childListener = childListener;
}
public void destroy(){
this.context = null;
this.groupList = null;
this.groupListener = null;
this.childListener = null;
}
private class ViewHolder{
GroupView groupView;
ChildView childView;
}
}
private List<GroupBean> getListData(){
List<GroupBean> itemList = new ArrayList<GroupBean>();
for(int i=0;i<10;i++){
GroupBean group = new GroupBean();
group.setName("group_"+(i+1));
List<ChildBean> childList = new ArrayList<ChildBean>();
for(int j=0;j<3;j++){
ChildBean child = new ChildBean();
child.setName("child"+j);
childList.add(child);
}
group.setChildList(childList);
itemList.add(group);
}
return itemList;
}
private static class GroupBean{
private boolean isExpand;
private String name;
private List<ChildBean> childList;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public List<ChildBean> getChildList() {
return childList;
}
public void setChildList(List<ChildBean> childList) {
this.childList = childList;
}
public boolean isExpand() {
return isExpand;
}
public void setExpand(boolean isExpand) {
this.isExpand = isExpand;
}
}
private static class ChildBean{
private String name;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}
private static class GroupView extends RelativeLayout {
private TextView nameView;
private ImageView arrowView;
public GroupView(Context context, ViewGroup parent) {
super(context);
init(parent);
}
private void init(ViewGroup parent) {
final LayoutInflater mLayoutInflater = LayoutInflater.from(getContext());
View v = mLayoutInflater.inflate(R.layout.list_item_group, parent, false);
addView(v);
nameView = (TextView)v.findViewById(R.id.username);
arrowView = (ImageView)v.findViewById(R.id.group_arrow);
}
public void setName(String name) {
this.nameView.setText(name);
}
public void setExpand(boolean expand){
if(expand){
arrowView.setBackgroundResource(R.drawable.arrow_down);
}else{
arrowView.setBackgroundResource(R.drawable.arrow_right);
}
}
}
private static class ChildView extends RelativeLayout {
private TextView nameView;
public ChildView(Context context, ViewGroup parent) {
super(context);
init(parent);
}
private void init(ViewGroup parent) {
final LayoutInflater mLayoutInflater = LayoutInflater.from(getContext());
View v = mLayoutInflater.inflate(R.layout.list_item_child, parent, false);
addView(v);
nameView = (TextView)v.findViewById(R.id.username);
}
public void setName(String name) {
this.nameView.setText(name);
}
}
}
activity_main.xml:<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<ListView
android:id="@+id/listview"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</LinearLayout>list_item_group.xml<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="wrap_content" >
<ImageView
android:id="@+id/group_arrow"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_centerVertical="true"
android:layout_marginLeft="20dp" />
<TextView
android:id="@+id/username"
android:layout_width="wrap_content"
android:layout_height="50dp"
android:layout_centerInParent="true" />
</RelativeLayout>list_item_child.xml:<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="wrap_content" >
<ImageView
android:id="@+id/usericon"
android:layout_width="50dp"
android:layout_height="50dp"
android:src=http://www.mamicode.com/"@drawable/ic_launcher" />>源码在：http://download.csdn.net/detail/goldenfish1919/7703143
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