ExpandableListView,可展開和摺疊的ListView
阿新 • • 發佈：2019-01-01
ExpandableListView介面實現效果：
一、XML程式碼
1.1 activity_expandable_list_view.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="match_parent">
<ExpandableListView
1.2 item_group_expandablelistview.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent" 1.3 item_child_expandablelistview.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:padding="10dp">
<ImageView
android:id="@+id/img_child_head"
android:layout_width="45dp"
android:layout_height="45dp"
android:scaleType="fitXY" />
<TextView
android:id="@+id/tv_child_name"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="15dp"
android:layout_marginTop="2dp"
android:layout_toRightOf="@id/img_child_head"
android:singleLine="true"
android:textSize="14sp" />
<TextView
android:id="@+id/tv_child_content"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignLeft="@id/tv_child_name"
android:layout_below="@id/tv_child_name"
android:layout_marginTop="5dp"
android:singleLine="true"
android:textSize="14sp" />
</RelativeLayout>二、Actvity程式碼
public class ExpandableListViewActivity extends Activity {
private ExpandableListView listView;
private MyExpandableListViewAdapter adapter;
private List<GroupData> groupList;
private List<List<ChildData>> childList;
private String[] url;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_expandable_list_view);
init();
loadData();
}
private void init() {
listView = (ExpandableListView) findViewById(R.id.expandableListView);
groupList = new ArrayList<>();
childList = new ArrayList<>();
adapter = new MyExpandableListViewAdapter(this, groupList, childList);
listView.setAdapter(adapter);
//重寫OnGroupClickListener，實現當展開時，ExpandableListView不自動滾動
listView.setOnGroupClickListener(new ExpandableListView.OnGroupClickListener() {
@Override
public boolean onGroupClick(ExpandableListView parent, View v, int groupPosition, long id) {
if (parent.isGroupExpanded(groupPosition)) {
parent.collapseGroup(groupPosition);
} else {
//第二個引數false表示展開時是否觸發預設滾動動畫
parent.expandGroup(groupPosition, false);
}
//telling the listView we have handled the group click, and don't want the default actions.
return true;
}
});
}
private void loadData() {
url = new String[]{
"http://cdn.duitang.com/uploads/item/201506/07/20150607125903_vFWC5.png",
"http://upload.qqbody.com/ns/20160915/202359954jalrg3mqoei.jpg",
"http://tupian.qqjay.com/tou3/2016/0726/8529f425cf23fd5afaa376c166b58e29.jpg",
"http://cdn.duitang.com/uploads/item/201607/13/20160713094718_Xe3Tc.png",
"http://img3.imgtn.bdimg.com/it/u=1808104956,526590423&fm=11&gp=0.jpg",
"http://tupian.qqjay.com/tou3/2016/0725/5d6272a4acd7e21b2391aff92f765018.jpg"
};
List<String> group = new ArrayList<>();
group.add("我的裝置");
group.add("我的好友");
group.add("初中同學");
group.add("高中同學");
group.add("大學同學");
for (int i = 0; i < group.size(); i++) {
GroupData gd = new GroupData(group.get(i), (i + 2) + "/" + (2 * i + 2));
groupList.add(gd);
}
for (int i = 0; i < group.size(); i++) {
List<ChildData> list = new ArrayList<>();
for (int j = 0; j < 2 * i + 2; j++) {
ChildData cd = null;
if (i == 0) {
cd = new ChildData("null", "我的手機", "上次登入");
list.add(cd);
cd = new ChildData("null", "發現新裝置", "玩轉只能信裝置，發現新生活");
list.add(cd);
break;
} else {
cd = new ChildData(url[j % url.length], "張三" + j, "你好！！！");
list.add(cd);
}
}
childList.add(list);
}
}
}
三、Adapter程式碼（MyExpandableListViewAdapter）
public class MyExpandableListViewAdapter implements ExpandableListAdapter {
private Context context;
private List<GroupData> groupData;
private List<List<ChildData>> childData;
public MyExpandableListViewAdapter(Context context, List<GroupData> groupData, List<List<ChildData>> childData) {
this.context = context;
this.groupData = groupData;
this.childData = childData;
}
@Override
public void registerDataSetObserver(DataSetObserver observer) {
}
@Override
public void unregisterDataSetObserver(DataSetObserver observer) {
}
//獲取分組個數
@Override
public int getGroupCount() {
int ret = 0;
if (groupData != null) {
ret = groupData.size();
}
return ret;
}
//獲取groupPosition分組，子列表數量
@Override
public int getChildrenCount(int groupPosition) {
int ret = 0;
if (childData != null) {
ret = childData.get(groupPosition).size();
}
return ret;
}
@Override
public Object getGroup(int groupPosition) {
return groupData.get(groupPosition);
}
@Override
public Object getChild(int groupPosition, int childPosition) {
return childData.get(groupPosition).get(childPosition);
}
@Override
public long getGroupId(int groupPosition) {
return groupPosition;
}
@Override
public long getChildId(int groupPosition, int childPosition) {
return childPosition;
}
@Override
public boolean hasStableIds() {
return true;
}
@Override
public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) {
GroupViewHolder holder = null;
if (convertView == null) {
convertView = LayoutInflater.from(context).inflate(R.layout.item_group_expandablelistview, null);
holder = new GroupViewHolder();
holder.img = (ImageView) convertView.findViewById(R.id.img_group);
holder.tv_name = (TextView) convertView.findViewById(R.id.tv_group_name);
holder.tv_num = (TextView) convertView.findViewById(R.id.tv_group_num);
convertView.setTag(holder);
} else {
holder = (GroupViewHolder) convertView.getTag();
}
GroupData groupData = this.groupData.get(groupPosition);
//是否展開
if (isExpanded) {
holder.img.setImageResource(R.drawable.img_bottom);
} else {
holder.img.setImageResource(R.drawable.img_right);
}
holder.tv_name.setText(groupData.getName());
holder.tv_num.setText(groupData.getNum());
return convertView;
}
@Override
public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {
ChildViewHolder holder = null;
if (convertView == null) {
convertView = LayoutInflater.from(context).inflate(R.layout.item_child_expandablelistview, null);
holder = new ChildViewHolder();
holder.img = (ImageView) convertView.findViewById(R.id.img_child_head);
holder.tv_name = (TextView) convertView.findViewById(R.id.tv_child_name);
holder.tv_content = (TextView) convertView.findViewById(R.id.tv_child_content);
convertView.setTag(holder);
} else {
holder = (ChildViewHolder) convertView.getTag();
}
ChildData childData = this.childData.get(groupPosition).get(childPosition);
Glide.with(context).load(childData.getUrl()).placeholder(R.mipmap.ic_launcher)
.error(R.mipmap.ic_launcher).into(holder.img);
holder.tv_name.setText(childData.getName());
holder.tv_content.setText(childData.getContent());
return convertView;
}
@Override
public boolean isChildSelectable(int groupPosition, int childPosition) {
return true;
}
@Override
public boolean areAllItemsEnabled() {
return false;
}
@Override
public boolean isEmpty() {
return false;
}
@Override
public void onGroupExpanded(int groupPosition) {
}
@Override
public void onGroupCollapsed(int groupPosition) {
}
@Override
public long getCombinedChildId(long groupId, long childId) {
return 0;
}
@Override
public long getCombinedGroupId(long groupId) {
return 0;
}
class GroupViewHolder {
ImageView img;
TextView tv_name, tv_num;
}
class ChildViewHolder {
ImageView img;
TextView tv_name, tv_content;
}
}
四、實體類程式碼
GroupData：
public class GroupData implements Serializable {
private String name;
private String num;
public GroupData(String name) {
this.name = name;
}
public GroupData(String name, String num) {
this.name = name;
this.num = num;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getNum() {
return num;
}
public void setNum(String num) {
this.num = num;
}
}
ChildData：
public class ChildData implements Serializable {
private String url;
private String name;
private String content;
public ChildData(String url, String name, String content) {
this.url = url;
this.name = name;
this.content = content;
}
public String getUrl() {
return url;
}
public void setUrl(String url) {
this.url = url;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getContent() {
return content;
}
public void setContent(String content) {
this.content = content;
}
}
頭像是通過Glide獲取，gradle匯入Glide以及Glide的簡單實用。
compile 'com.github.bumptech.glide:glide:3.7.0'
Glide.with(context).load(childData.getUrl())
.placeholder(R.mipmap.ic_launcher)
.error(R.mipmap.ic_launcher).into(holder.img);placeholder：圖片載入到之前顯示的圖片
error：圖片載入失敗顯示的圖片
分組向右、向下的2張圖片：
不足之處，希望各位大神能夠給予批評和指正。