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android使用ExpandableListView控件實(shí)現(xiàn)小說目錄效果的例子

更新時(shí)間：2014年07月10日 09:20:59 投稿：junjie

這篇文章主要介紹了android使用ExpandableListView控件實(shí)現(xiàn)小說目錄效果的例子,還可以實(shí)現(xiàn)二級(jí)列表展示效果,需要的朋友可以參考下

今天給大家講講android的目錄實(shí)現(xiàn)方法,就像大家看到的小說目錄一樣,android 提供了ExpandableListView控件可以實(shí)現(xiàn)二級(jí)列表展示效果,現(xiàn)在給大家講講這個(gè)控件的用法,下面是XML定義：

復(fù)制代碼代碼如下:

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout

    xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="fill_parent"

    android:layout_height="fill_parent"

    android:orientation="vertical"

    android:background="#FFFFFF"

  >

  <ExpandableListView

       android:id="@+id/elv_journal_catalog"

       android:layout_height="fill_parent"

       android:layout_width="fill_parent"

       android:cacheColorHint="#FFFFFF"

       />

</LinearLayout>

這代碼很簡單,和寫listView的方法差不多,接下來是ExpandableListView在activity中的代碼：

復(fù)制代碼代碼如下:

private ExpandableListView elv_journal_catalog;
    private List<List<Article>> childrenObj;
         private JournalCatalogListAdapter adapter;
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.journal_catalog);
        init();
        elv_journal_catalog.setGroupIndicator(null);
        elv_journal_catalog.setDivider(null);

loadData();
}

    private void init() {
        elv_journal_catalog = (ExpandableListView) findViewById(R.id.elv_journal_catalog);
        elv_journal_catalog.setOnChildClickListener(listener);
    }
    private void loadData() {
        Message msg = handler.obtainMessage();
        msg.what = 1;
        msg.sendToTarget();

childrenObj = new ArrayList<List<Article>>();
new Thread() {

            @Override
            public void run() {
                if (!isLoading) {
                    queryArticleList();
                } else {
                    queryArticleListFromSqlite();
                }
            }

}.start();

        adapter = new JournalCatalogListAdapter(this, childrenObj);
        elv_journal_catalog.setAdapter(adapter);
    }

ExpandableListView展示數(shù)據(jù)的時(shí)候默認(rèn)是每個(gè)模塊下的列表項(xiàng)是閉合狀態(tài)的，如果要實(shí)現(xiàn)初始化的時(shí)候就展開可以通過ExpandableListView.expandGroup(location)方法來實(shí)現(xiàn)，而且每個(gè)父級(jí)列表項(xiàng)左邊會(huì)出現(xiàn)一個(gè)系統(tǒng)自帶的圖標(biāo)，這個(gè)圖標(biāo)是用來表示列表展開和閉合的狀態(tài)的，如果不顯示或者要替換這個(gè)圖標(biāo)可以用
ExpandableListView.setGroupIndicator(Drawable icon)方法來實(shí)現(xiàn),我這里是直接是沒有使用任何圖標(biāo),你也可以在adapter中自己在xml中定義自己的圖標(biāo).
ExpandableListView填充數(shù)據(jù)需要是二級(jí)菜單的模式所以數(shù)據(jù)結(jié)構(gòu)大家可以根據(jù)項(xiàng)目情況而定，我這里由于標(biāo)題是定死的所以只傳的每個(gè)標(biāo)題下的數(shù)據(jù)，下面是JournalCatalogListAdapter的代碼：

復(fù)制代碼代碼如下:

public class JournalCatalogListAdapter extends BaseExpandableListAdapter {

private LayoutInflater inflater;

private String[] parent = new String[] { "美顏美體", "潮流單品", "娛樂八卦", "情感",
"觀點(diǎn)", "健康生活" };

private List<List<Article>> clildren = new ArrayList<List<Article>>();

    public JournalCatalogListAdapter(Context context,
            List<List<Article>> clildren) {
        this.clildren = clildren;
        inflater = LayoutInflater.from(context);
    }

    @Override
    public Object getChild(int groupPosition, int childPosition) {
        return clildren.get(groupPosition).get(childPosition);
    }

    @Override
    public long getChildId(int groupPosition, int childPosition) {
        return childPosition;
    }

    @Override
    public View getChildView(int groupPosition, int childPosition,
            boolean isLastChild, View convertView, ViewGroup parent) {
        if (convertView == null) {
            convertView = inflater.inflate(
                    R.layout.journal_catalog_list_item_content, null);
        }
        TextView textView = (TextView) convertView
                .findViewById(R.id.tv_journal_catalog_list_item_content);
        Article a = (Article) getChild(groupPosition, childPosition);
        textView.setText(a.getTitle());
        return convertView;
    }

    @Override
    public int getChildrenCount(int groupPosition) {
        return clildren.get(groupPosition).size();
    }

    @Override
    public Object getGroup(int groupPosition) {
        return parent[groupPosition];
    }

    @Override
    public int getGroupCount() {
        return parent.length;
    }

    @Override
    public long getGroupId(int groupPosition) {
        return groupPosition;
    }

    @Override
    public View getGroupView(int groupPosition, boolean isExpanded,
            View convertView, ViewGroup parent) {
        if (convertView == null) {
            convertView = inflater.inflate(
                    R.layout.journal_catalog_list_item_title, null);
        }
        TextView textView = (TextView) convertView
                .findViewById(R.id.tv_journal_catalog_list_item_title);

        String title = String.valueOf(getGroup(groupPosition));
        textView.setText(title);
        convertView.setOnClickListener(null);
        return convertView;
    }

    @Override
    public boolean hasStableIds() {
        return true;
    }

    @Override
    public boolean isChildSelectable(int groupPosition, int childPosition) {
        return true;
    }
}

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