Android ExpandableListView展開列表控件使用實例

2020-04-11 11:48:53

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你是否覺得手機QQ上的好友列表那個控件非常棒？不是..... 那也沒關系，學多一點知識對自己也有益無害。

那么我們就開始吧。

展開型列表控件，原名ExpandableListView
是普通的列表控件進階版，可以自由的把列表進行收縮，非常的方便兼好看。
首先看看我完成的截圖，雖然界面不漂亮，但大家可以自己去修改界面。

該控件需要一個主界面XML 一個標題界面XML及一個列表內容界面XML
首先我們來看看 mian.xml 主界面

復制代碼代碼如下:

//該界面非常簡單，只要一個ExpandableListView即可
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

groups.xml 該界面是父標題界面
我們只要放上一個要顯示出來的標題TextView控件上去即可

復制代碼代碼如下:

</LinearLayout>

childs.xml 是子控件，直接顯示列表內容

復制代碼代碼如下:

</LinearLayout>

接下來再上主代碼, 命名有點亂，大家真正用于開發時可不要這樣命名啊.

復制代碼代碼如下:

public class ExpandActivity extends ExpandableListActivity
{
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        //創建二個一級條目標題
        Map<String, String> title_1 = new HashMap<String, String>();
        Map<String, String> title_2 = new HashMap<String, String>();

        title_1.put("group", "開發");
        title_2.put("group", "管理");

        //創建一級條目容器
        List<Map<String, String>> gruops = new ArrayList<Map<String,String>>();

        gruops.add(title_1);
        gruops.add(title_2);

        //創建二級條目內容

        //內容一
        Map<String, String> content_1 = new HashMap<String, String>();
        Map<String, String> content_2 = new HashMap<String, String>();

        content_1.put("child", "VC++");
        content_2.put("child", "Java");

        List<Map<String, String>> childs_1 = new ArrayList<Map<String,String>>();
        childs_1.add(content_1);
        childs_1.add(content_2);

        //內容二
        Map<String, String> content_3 = new HashMap<String, String>();
        Map<String, String> content_4 = new HashMap<String, String>();

        content_3.put("child", "敏捷開發");
        content_4.put("child", "迭代開發");

        List<Map<String, String>> childs_2 = new ArrayList<Map<String,String>>();
        childs_2.add(content_3);
        childs_2.add(content_4);

        //存放兩個內容, 以便顯示在列表中
        List<List<Map<String, String>>> childs = new ArrayList<List<Map<String,String>>>();
        childs.add(childs_1);
        childs.add(childs_2);

        //創建ExpandableList的Adapter容器
        //參數: 1.上下文    2.一級集合 3.一級樣式文件 4. 一級條目鍵值  5.一級顯示控件名
        //   6. 二級集合 7. 二級樣式 8.二級條目鍵值 9.二級顯示控件名
        SimpleExpandableListAdapter sela = new SimpleExpandableListAdapter(
                this, gruops, R.drawable.groups, new String[]{"group"}, new int[]{R.id.textGroup},
                childs, R.drawable.childs, new String[]{"child"}, new int[]{R.id.textChild}
                );

        //加入列表
        setListAdapter(sela);
    }
}
//最后，如果想響應各操作的話，就要重載下面的方法
//列表內容按下
@Override
public boolean onChildClick(ExpandableListView parent, View v, int groupPosition, int childPosition, long id)
{
    // TODO Auto-generated method stub
    return super.onChildClick(parent, v, groupPosition, childPosition, id);
}

//二級標題按下
@Override
public boolean setSelectedChild(int groupPosition, int childPosition, boolean shouldExpandGroup)
{
// TODO Auto-generated method stub
return super.setSelectedChild(groupPosition, childPosition, shouldExpandGroup);
}

//一級標題按下
@Override
public void setSelectedGroup(int groupPosition)
{
// TODO Auto-generated method stub
super.setSelectedGroup(groupPosition);
}

再最后，運行你的模擬器就可以看見啦。
將上面的ExpandableListView控件化.
控件化比較簡單我們只要用普通的Activity類就可以了，不用再繼承ExpandableListView.
只需要在成員變量中添加
private ExpandableListView expandList;
然后在添加內容時改成
expandList.setAdapter(sela);
就可以了。當然，響應事件Listener也可以自己添加。

附：另一個例子

ExpandableListView的用法與ListView和GridView,Gallery 類似,都是通過一個Adapter來顯示.
main.xml:

復制代碼代碼如下:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="fill_parent"
    android:layout_height="fill_parent">
    <ExpandableListView android:id="@+id/elv" android:indicatorRight="160dp"
        android:layout_width="fill_parent" android:layout_height="fill_parent">
    </ExpandableListView>
    <!-- indicatorRight 設置那個小圖標右邊緣與 ExpandableListView左邊緣的間距-->
</LinearLayout>

ElvAdapter.java

復制代碼代碼如下:

package com.test;

import java.util.ArrayList;

import android.content.Context;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseExpandableListAdapter;
import android.widget.ExpandableListView;
import android.widget.TextView;
import android.widget.LinearLayout.LayoutParams;

public class ElvAdapter extends BaseExpandableListAdapter
{

    ArrayList<ElvObject> objs;
    Context context;
    ElvAdapter(Context context,ArrayList<ElvObject> objs)
    {
        this.objs=objs;
        this.context=context;
    }
    @Override
    public Object getChild(int groupPosition, int childPosition)
    {
        // TODO Auto-generated method stub
        return objs.get(groupPosition).childs.get(childPosition);
    }

    @Override
    public long getChildId(int groupPosition, int childPosition)
    {
        // TODO Auto-generated method stub
        return childPosition;
    }

    @Override
    public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent)
    {
        //子元素的View
        TextView tv=new TextView(context);
        tv.setText(objs.get(groupPosition).childs.get(childPosition));
        tv.setLayoutParams(new ExpandableListView.LayoutParams(ExpandableListView.LayoutParams.FILL_PARENT,ExpandableListView.LayoutParams.WRAP_CONTENT));
        return tv;
    }

    @Override
    public int getChildrenCount(int groupPosition)
    {
        // TODO Auto-generated method stub
        return objs.get(groupPosition).childs.size();
    }

    @Override
    public Object getGroup(int groupPosition)
    {
        // TODO Auto-generated method stub
        return objs.get(groupPosition);
    }

    @Override
    public int getGroupCount()
    {
        // TODO Auto-generated method stub
        return objs.size();
    }

    @Override
    public long getGroupId(int groupPosition)
    {
        // TODO Auto-generated method stub
        return groupPosition;
    }

    @Override
    public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent)
    {
        //分組的View
        TextView tv=new TextView(context);
        tv.setText(objs.get(groupPosition).groupName);
        ExpandableListView.LayoutParams params=new ExpandableListView.LayoutParams(ExpandableListView.LayoutParams.FILL_PARENT,60);
        tv.setLayoutParams(params);
        return tv;
    }

    @Override
    public boolean hasStableIds()
    {
        // TODO Auto-generated method stub
        return false;
    }

    @Override
    public boolean isChildSelectable(int groupPosition, int childPosition)
    {
        // TODO Auto-generated method stub
        return true;
    }

}

class ElvObject{
    String groupName="";
    ArrayList<String> childs=new ArrayList<String>();
    ElvObject(String groupName,ArrayList<String> childs)
    {
        this.groupName=groupName;
        this.childs=childs;
    }
}

注意下面還有一個ElvObject類
主程序AndroidTestActivity.java

復制代碼代碼如下:

package com.test;
 
import java.util.ArrayList;
 
import android.app.Activity;
import android.os.Bundle;
import android.widget.ExpandableListView;
 
public class AndroidTestActivity extends Activity
{
    /** Called when the activity is first created. */
    ExpandableListView elv;
    ElvAdapter adapter;
    ArrayList<ElvObject> objs=new ArrayList<ElvObject>();
    @Override
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        elv=(ExpandableListView)findViewById(R.id.elv);
        adapter=new ElvAdapter(this,objs);
        elv.setAdapter(adapter);
        ArrayList<String> list=new ArrayList<String>();
        list.add("aaa");
        list.add("bbb");
        list.add("ccc");
        objs.add(new ElvObject("英文",list));
        ArrayList<String> list2=new ArrayList<String>();
        list2.add("111");
        list2.add("222");
        list2.add("333");
        list2.add("444");
        objs.add(new ElvObject("數字",list2));
 
    }
}