本文将带你了解Android应用开发之ExpandableListView代码实例，希望本文对大家学Android有所帮助。

ExpandableListView是一种可应用于某种环境的下拉列表。
    实例代码：
    package   com.example.lenovo.expandablelistview_demo; import   android.support.v7.app.AppCompatActivity;import android.os.Bundle;import   android.view.View;import android.view.ViewGroup;import   android.widget.BaseExpandableListAdapter;import android.widget.ExpandableListAdapter;import   android.widget.ExpandableListView;import android.widget.TextView; public   class MainActivity extends AppCompatActivity   {     private ExpandableListView   expandableListView;     private   MyBaseExpandableListAdapter adapter;    private String[]   group = {"我的好友","陌生人","黑名单"};    private   String[][] children =   {            {"小王","急急急","kl","考虑"},            {"流域","蜡笔","一扭"},            {"ren","du","处矛"}    };      @Override    protected   void onCreate(Bundle savedInstanceState)   {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);         this.expandableListView   = (ExpandableListView)   this.findViewById(R.id.expandableListView);        adapter   = new   MyBaseExpandableListAdapter();        this.expandableListView.setAdapter(adapter);    }    private   final class MyBaseExpandableListAdapter extends   BaseExpandableListAdapter{         @Override        //返回组中元素的个数        public   int getGroupCount()   {            return   group.length;        }         @Override        //根据组的索引返回当前组中子元素的个数        public   int getChildrenCount(int groupPosition)   {            return    children[groupPosition].length;        }         @Override        //返回指定组索引处的元素值        public   Object getGroup(int groupPosition)   {            return   group[groupPosition];        }         @Override        //返回指定组索引和子元素索引对应的值        public   Object getChild(int groupPosition, int childPosition)   {            return   children[groupPosition][childPosition];        }         @Override        //返回组的id值        public long   getGroupId(int groupPosition)   {            return   groupPosition;        }         @Override        //返回指定组中的子元素指定索引的值        public   long getChildId(int groupPosition, int childPosition)   {            return   childPosition;        }         @Override        public   boolean hasStableIds()   {            return   false;        }         @Override        //当绘制组的View对象时自动调用的方法        /**         *   groupPosition :组的索引值         *   isExpanded:当前组下的元素是否被展开         *         */        public   View getGroupView(int groupPosition, boolean isExpanded, View convertView,   ViewGroup parent)   {              View   view =   View.inflate(MainActivity.this,R.layout.group_view,null);             TextView   textView_group  = (TextView)   view.findViewById(R.id.textView_group);            //得到组名            String   groupName =   group[groupPosition];            textView_group.setText(groupName);            return   view;        }         @Override        public   View getChildView(int groupPosition, int childPosition, boolean isLastChild,   View convertView, ViewGroup parent)   {            View   view =   View.inflate(MainActivity.this,R.layout.child_view,null);            TextView   textView_child = (TextView)   view.findViewById(R.id.textView_child);            String   childrenName = children[groupPosition][childPosition];             textView_child.setText(childrenName);            return    view;        }         @Override        //子元素是否被选中,默认值为false,表示不能被选中        public boolean   isChildSelectable(int groupPosition, int childPosition)   {            return   true;        }    }}    

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