自定義ExpandableListView以及實現其分頁
我在網上找了很久也沒看到類似百度貼吧評論以及再次評論的例項，但因為工作需要不得不寫，經過研究自己寫了一個例子供大家參考
自定義ExpandableListPageView實現分頁效果
public class ExpandableListPageView extends ExpandableListView implements
OnScrollListener {
// private static String Tag = "ListPageView";
public Boolean canLoad = false; // 是否能夠載入資料
public int currentPageIndex = 0; // 記錄頁索引
public int pageSize = 0; // 每頁顯示專案數
public String loadMessage = "正在載入...."; // 進度條提示訊息
public LinearLayout footerLayout;// 頁尾
public OnPageLoadListener listener;// 分佈偵聽事件
public Context context;
public ExpandableListPageView(Context context) {
super(context);
}
public ExpandableListPageView(Context context, AttributeSet attrs) {
super(context, attrs);
}
/**
* 設定第頁顯示專案數
*
* @param pageSize
* 第頁顯示專案數
*/
public void setPageSize(int pageSize) {
this.pageSize = pageSize;
}
/**
* 進度條顯示的訊息文字
*
* @param msg
*/
public void setLoadMessage(String msg) {
this.loadMessage = msg;
}
/*
* 設定資料來源
*
* @see android.widget.ListView#setAdapter(android.widget.ListAdapter)
*/
@Override
public void setAdapter(ExpandableListAdapter adapter) {
this.setOnScrollListener(this);
// 必須在setAdapter()方法之前構建進度條並新增到頁尾
this.BuildProgressBar();
super.setAdapter(adapter);
}
@Override
public void onScrollStateChanged(AbsListView view, int scrollState) {
if (this.canLoad && (scrollState == OnScrollListener.SCROLL_STATE_IDLE)) {
// 載入資料
if (listener != null) {
this.currentPageIndex++;
listener.onPageChanging(this.pageSize, currentPageIndex);
// System.out.println("----####------this.pageSize-------"+this.pageSize);
// System.out.println("----####------this.currentPageIndex-------"+currentPageIndex);
}
}
}
@Override
public void onScroll(AbsListView view, int firstVisibleItem,
int visibleItemCount, int totalItemCount) {
// Log.i("####", "listener = " + listener + " firstVisibleItem = " +
// firstVisibleItem + " visibleItemCount = "
// + visibleItemCount + " totalItemCount = " + totalItemCount);
this.canLoad = false;
if (this.listener == null) {
return;
}
if ((firstVisibleItem + visibleItemCount) == totalItemCount) {
this.canLoad = this.listener.canLoadData();
}
// Log.i("####", "判斷canLoad = " + canLoad);
}
/**
* 是否顯示進度條
*
* @param isVisible
* true:顯示,false:不顯示
*/
public void setProggressBarVisible(Boolean isVisible) {
if (this.footerLayout == null) {
return;
}
int visibility = View.VISIBLE;
if (!isVisible) {
visibility = View.GONE;
}
// 定位到最後一行,必須設定，要不然進度條看不到
this.setSelection(this.getAdapter().getCount());
this.footerLayout.setVisibility(visibility);
// 設定頁尾中元件的顯示狀態
for (int i = 0; i < this.footerLayout.getChildCount(); i++) {
View v = this.footerLayout.getChildAt(i);
v.setVisibility(visibility);
}
}
/**
* 建立頁尾顯示進度條,必須在setAdapter()方法之前呼叫.
*
* @return
*/
private void BuildProgressBar() {
if (this.getFooterViewsCount() != 0) {
return;
}
footerLayout = new LinearLayout(this.getContext());
footerLayout.setGravity(Gravity.CENTER);
footerLayout.setPadding(0, 0, 0, 0);
footerLayout.setOrientation(LinearLayout.HORIZONTAL);
ProgressBar bar = new ProgressBar(this.getContext());
footerLayout.addView(bar);
footerLayout.setBackgroundResource(R.color.white);
TextView txt = new TextView(this.getContext());
txt.setText(this.loadMessage);
footerLayout.addView(txt);
footerLayout.setVisibility(View.GONE);
this.addFooterView(footerLayout);
}
/**
* 設定頁載入偵聽事件
*
* @param listener
*/
public void setOnPageLoadListener(OnPageLoadListener listener) {
this.listener = listener;
}
public interface OnPageLoadListener {
/**
* 觸發分頁事件
*
* @param pageSize
* @param pageIndex
*/
public void onPageChanging(int pageSize, int pageIndex);
/**
* 是否能夠載入資料 此方法返回結果為true時觸發OnPageChanging事件，否則不做任何處理
*
* @return
*/
public boolean canLoadData();
}
}
/***
* 例項類
*
*/
public class PostActivity extends Activity implements
OnPageLoadListener, OnClickListener {
PostAdapter adapter;
private ExpandableListPageView listView;
int page = 1;
private int pageSize = 5;// 分頁每頁顯示資料
long messageSize = 0;
int lastItem = 0;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.main_liaoyiliaopost);
into();
}
public void into() {
listView = (ExpandableListPageView) this
.findViewById(R.id.post_list_view);
// 構建空的介面卡
registerForContextMenu(listView);
this.adapter = new PostAdapter(this);
listView.setOnPageLoadListener(this);
// 設定進度條提示訊息
listView.setLoadMessage("load");
listView.setAdapter(adapter);
// 設定每次載入顯示數量
listView.setPageSize(pageSize);
// 設定監聽事件
// 預設載入第1頁資料
LoadBindData load = new LoadBindData(5, 0);
load.execute();
}
@Override
public void onPageChanging(final int pageSize, final int pageIndex) {
// 載入資料
LoadBindData load = new LoadBindData(pageSize, pageIndex);
load.execute();
}
@Override
public boolean canLoadData() {
// return (this.adapter.getCount() >= 5) ? false : true;
return (adapter.getGroupCount() >= messageSize) ? false : true;
}
/**
* @author RUJC 非同步讀取資料
*/
public class LoadBindData extends AsyncTask<String, String, String> {
private List<PostGroup> list;
private int pageSize;
private int pageIndex;
/**
* 建構函式
*
* @param pageSize
* 每次載入的專案數
* @param pageIndex
* 頁索引
*/
public LoadBindData(int pageSize, int pageIndex) {
this.pageSize = pageSize;
this.pageIndex = pageIndex;
if (pageIndex == 0) {
page = 1;
} else {
page++;
}
}
@Override
protected void onPreExecute() {
// 在doInBackground執行之前觸發.
// 顯示進度條
listView.setProggressBarVisible(true);
super.onPreExecute();
}
@Override
protected void onPostExecute(String result) {
// doInBackground執行完後觸發,result是doInBackground執行後的返回值.
// 更新資料並關閉進度條顯示
if (list != null) {
adapter.add(list);
}
// 更新介面資料顯示
adapter.notifyDataSetChanged();
// 關閉進度條
listView.setProggressBarVisible(false);
super.onPostExecute(result);
}
@Override
protected String doInBackground(String... params) {
// 讀取資料
list = getData(pageSize, pageIndex);
return null;
}
}
/**
* 資料來源
*
* @param pageSize
* 每次載入顯示的專案數
* @param pageIndex
* 頁索引
* @return
*/
private List<PostGroup> getData(int pageSize, int pageIndex) {
List<PostInfo> childList = null;
List<PostGroup> groupList = null;
PostInfo childInfo;
PostGroup groupInfo;
try {
groupList = new ArrayList<PostGroup>();
for (int i = 0; i < nArray.length(); i++) {//nArray是獲取網路資料的一個List集合
JSONObject myObj = nArray.getJSONObject(i);
String userAlias = "userAlias "
String username = "username";
childList = new ArrayList<Info>();
groupInfo = new PostInfo ();
groupInfo.setUserAlias(userAlias);
groupInfo.setUname(username);
JSONArray childs = myObj.getJSONArray("childs");
for (int j = 0; j < childs.length(); j++) {
childInfo = new PostInfo();
String userAliass = childsObj.getString("userAlias");
String usernames = childsObj.getString("username");
childInfo.setUserAlias(userAliass);
childList.add(childInfo);
childInfo = null;
}
groupInfo.setPostInfo(childList);
groupList.add(groupInfo);
groupInfo = null;
}
} catch (Exception e) {
// TODO: handle exception
}
return groupList;
}
}
介面卡
public class PostAdapter extends BaseExpandableListAdapter {
private LayoutInflater mChildInflater;
Context context;
private List<PostGroup> groupList = new ArrayList<PostGroup>();
public LiaoYiLiaoPostAdapter(Context context) {
mChildInflater = (LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
public void add(List<PostGroup> messages) {
groupList.addAll(messages);
}
@Override
public int getGroupCount() {
return groupList.size();
}
@Override
public int getChildrenCount(int groupPosition) {
int s = 0;
if (null != groupList.get(groupPosition).getPostInfo()) {
s = groupList.get(groupPosition).getPostInfo().size();
} else {
s = 0;
}
return s;
}
@Override
public LiaoYiLiaoPostGroup getGroup(int groupPosition) {
return groupList.get(groupPosition);
}
@Override
public PostInfo getChild(int groupPosition, int childPosition) {
return groupList.get(groupPosition).getPostInfo()
.get(childPosition);
}
@Override
public long getGroupId(int groupPosition) {
// TODO Auto-generated method stub
return groupPosition;
}
@Override
public long getChildId(int groupPosition, int childPosition) {
// TODO Auto-generated method stub
return childPosition;
}
@Override
public boolean hasStableIds() {
// TODO Auto-generated method stub
return false;
}
/**
* 設定父組樣式
*
* **/
@Override
public View getGroupView(int groupPosition, boolean isExpanded,
View convertView, ViewGroup parent) {
FriendHolder holder;
if (convertView == null) {
holder = new FriendHolder();
convertView = mChildInflater
.inflate(R.layout.list_post_group, null);
holder.userheadimg = (ImageView) convertView
.findViewById(R.id.userheadimg);
holder.but_post = (ImageView) convertView
.findViewById(R.id.but_post);
holder.username = (TextView) convertView
.findViewById(R.id.username);
holder.time = (TextView) convertView.findViewById(R.id.time);
holder.floor = (TextView) convertView.findViewById(R.id.floor);
holder.info = (TextView) convertView.findViewById(R.id.info);
convertView.setTag(holder);
} else {
holder = (FriendHolder) convertView.getTag();
}
String headimg = "http://www.homefoot.com"
+ groupList.get(groupPosition).getUsrImg();// 頭像
String name = groupList.get(groupPosition).getUserAlias();// 暱稱
String times = groupList.get(groupPosition).getDate();
CharSequence content = groupList.get(groupPosition).getInfoSequence();
holder.info.setText(content);
holder.time.setText(times);
holder.username.setText(name);
int floor = groupPosition + 1;
String flor = " " + floor + "樓";
holder.floor.setText(flor);
ImageLoader iLoader = new ImageLoader(context);
iLoader.DisplayImage(headimg, holder.userheadimg, false);
return convertView;
}
@Override
public View getChildView(int groupPosition, int childPosition,
boolean isLastChild, View convertView, ViewGroup parent) {
FriendHolder holder;
if (convertView == null) {
holder = new FriendHolder();
convertView = mChildInflater
.inflate(R.layout.list_post_child, null);
holder.uname = (TextView) convertView.findViewById(R.id.uname);
convertView.setTag(holder);
} else {
holder = (FriendHolder) convertView.getTag();
}
LiaoYiLiaoPostInfo groupname = groupList.get(groupPosition)
.getPostInfo().get(childPosition);
holder.uname.setText(groupname.getUserAlias());// 好友名稱
return convertView;
}
@Override
public boolean isChildSelectable(int groupPosition, int childPosition) {
// TODO Auto-generated method stub
return true;
}
class FriendHolder {
// 父類
ImageView userheadimg;// 頭像
ImageView but_post;// 回覆按鈕
TextView username;// 使用者名稱
// 子類
TextView uname;// 使用者名稱
TextView coinfo;// 內容
}
}
建立一個main.xml檔案
< ?xml version="1.0" encoding="utf-8"?>
< LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/contact_list_activity"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@drawable/gray_back"
android:orientation="vertical" >
<com.demo.util.ExpandableListPageView<!--com.demo.util 所在的包名 -->
android:id="@+id/liao_post_list_view"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:cacheColorHint="#00000000"
android:childDivider="@drawable/interval_line"
android:divider="@drawable/interval_line"
android:dividerHeight="1dp"
android:fadingEdge="none"
android:groupIndicator="@null"
android:listSelector="@drawable/list_item_bg" />
</LinearLayout>
我只提供了一個思路，如果要執行需要改程式碼 ，不清楚的地方可以相互交流下