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Android开发实践：多级列表的封装与应用

2017-11-26 542

   Android中多级列表可以使用ExpandableListView和SimpleExpandableListAdapter配合来实现，但是，SimpleExpandableListAdapter用起来挺麻烦的，不易理解，而且扩展性也不好，因此，自定义BaseExpandableListAdapter类的子类以及封装相关的操作，用起来会更加直观和方便，我把我设计的封装贴出来供新手参考吧。


   首先上效果图，如图所示：


224351468.png


1. 首先设计多级列表的标题类


就像文件和文件夹可以统一地用File类来抽象一样，多级列表的一级标题和二级标题其实也可以用同一个基类来抽象，因此，我设计了一个基类和两个子类，GroupList，GroupListChild 和 GroupListParent，其实现如下所示：


（1） GroupList 多级列表标题的抽象基类


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public  abstract  class  GroupList {
     private  final  String mTitle;
                                                                                                                                                                                                                                                                            
     public  GroupList(String title) {
         mTitle = title;
     }
                                                                                                                                                                                                                                                                            
     public  String getTitle() {
         return  mTitle;
     }
                                                                                                                                                                                                                                                                            
     public  abstract  List<GroupList> getChild();
                                                                                                                                                                                                                                                                            
     public  abstract  int  getResource();     
     public  abstract  void  buildView(View v);
}


（2） GroupListChild 多级列表二级标题子类


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public  class  GroupListChild  extends  GroupList {
                                                                                                                                                                                                                                  
     public  GroupListChild(String title) {
         super (title);      
     }
                                                                                                                                                                                                                               
     @Override
     public  int  getResource() {
         return  R.layout.grouplist_child;
     }
                                                                                                                                                                                                                               
     @Override
     public  List<GroupList> getChild() {     
         return  null ;
     }
                                                                                                                                                                                                                               
     @Override
     public  void  buildView(View v) {
                                                                                                                                                                                                                                      
         TextView textView  = (TextView)v.findViewById(R.id.GroupListChild);                   
         textView.setText(getTitle());
     } 
}


（3） GroupListParent 多级列表一级标题子类


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public  class  GroupListParent  extends  GroupList {
                                                                                                                                                                                                                   
     private  List<GroupList> mPopListChilds;
                                                                                                                                                                                                                       
     public  GroupListParent(String title,List<GroupList> childs) {
         super (title);      
         mPopListChilds = childs;
     }
                                                                                                                                                                                                                   
     @Override
     public  int  getResource() {
         return  R.layout.grouplist_parent;
     }
                                                                                                                                                                                                                   
     @Override
     public  List<GroupList> getChild() {
         return  mPopListChilds;
     }
                                                                                                                                                                                                                       
     @Override
     public  void  buildView(View v) {
                                                                                                                                                                                                                                  
         TextView textView = (TextView)v.findViewById(R.id.GroupListParent);              
         textView.setText(getTitle());
     }
}


2.  设计BaseExpandableListAdapter的子类


我设计的子类是一种通用的Adapter子类，类的实现中并不包含具体的Layout实现，所有的Layout都由GroupList的getResource和buildView来负责，因此，可以非常灵活地修改Layout的具体实现，而不用修改Adapter的代码。


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public  class  GroupListAdapter  extends  BaseExpandableListAdapter {
                                                                                                                                                                              
     private  Context mContext;
     private  List<GroupList> mGroups;
                                                                                                                                                                                  
     public  GroupListAdapter(Context context, List<GroupList> groups) {
         this .mContext = context;
         this .mGroups  = groups;
     }
                                                                                                                                                                                  
     @Override
     public  Object getChild( int  groupPosition,  int  childPosition) {
                                                                                                                                                                                     
         List<GroupList> chList = mGroups.get(groupPosition).getChild();
         if ( chList ==  null ) {
             return  null ;
         }
                                                                                                                                                                                      
         return  chList.get(childPosition);
     }
                                                                                                                                                                              
     @Override
     public  long  getChildId( int  groupPosition,  int  childPosition) {
                                                                                                                                                                               
         return  childPosition;
     }
                                                                                                                                                                                
     @Override
     public  View getChildView( int  groupPosition,  int  childPosition,  boolean  isLastChild, View view,ViewGroup parent) {
                                                                                                                                                                                                                     
         GroupList child = (GroupList)getChild(groupPosition, childPosition);
         if ( child ==  null ) {
             return  null ;
         }
                                                                                                                                                                                          
         if  (view ==  null ) {   
             LayoutInflater inflater = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);        
             view = (RelativeLayout)inflater.inflate(child.getResource(),  null );
         }
                                                                                                                                                                                           
         child.buildView(view);
                                                                                                                                                                                     
         return  view;
     }
                                                                                                                                                                                
     @Override
     public  int  getChildrenCount( int  groupPosition) {
                                                                                                                                                                                     
         List<GroupList> chList = mGroups.get(groupPosition).getChild();
         if ( chList ==  null ) {
             return  0 ;
         }
                                                                                                                                                                                     
         return  chList.size();
     }
                                                                                                                                                                                
     @Override
     public  Object getGroup( int  groupPosition) {
         return  mGroups.get(groupPosition);
     }
                                                                                                                                                                                
     @Override
     public  int  getGroupCount() {
         return  mGroups.size();
     }
                                                                                                                                                                                
     @Override
     public  long  getGroupId( int  groupPosition) {
         return  groupPosition;
     }
                                                                                                                                                                                
     @Override
     public  View getGroupView( int  groupPosition,  boolean  isLastChild, View view,ViewGroup parent) {
                                                                                                                                                                               
         GroupList group = (GroupList)getGroup(groupPosition);
                                                                                                                                                                                       
         if  (view ==  null ) {
                                                                                                                                                                                
             LayoutInflater inflater = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);        
             view = (RelativeLayout)inflater.inflate(group.getResource(),  null );  
         }
                                                                                                                                                                                
         group.buildView(view);
                                                                                                                                                                                     
         return  view;
     }
                                                                                                                                                                                
     @Override
     public  boolean  hasStableIds() {
         return  true ;
     }
                                                                                                                                                                                
     @Override
     public  boolean  isChildSelectable( int  arg0,  int  arg1) {
         return  true ;
     }
}


3.  应用代码


为了简化，我就直接在MainActivity中使用上述封装的类来完成多级列表的功能演示，示例如下：


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public  class  MainActivity  extends  Activity  implements  OnGroupClickListener,OnChildClickListener {
                                                                                                                                              
     private  ExpandableListView mlistView; 
     private  GroupListAdapter mAdapter;
                                                                                                                                                  
     private  static  final  String[] mParentMenu = {
         "Book" ,  "Video" ,  "Audio"
     };
                                                                                                                                                  
     private  static  final  String[][] mChildMenu = {
         {  "book1" ,  "book2" ,  "book3" ,  "book4"  },
         {  "video1" ,  "video2"  },
         {  "audio1" ,  "audio2" ,  "audio3" , "audio4" }
     };
                                                                                                                                                  
     @Override
     protected  void  onCreate(Bundle savedInstanceState) {
         super .onCreate(savedInstanceState);
                                                                                                                                                            
         mlistView =  new  ExpandableListView( this );                      
         mlistView.setOnGroupClickListener( this );      
         mlistView.setOnChildClickListener( this );
                                                                                                                                                       
         List<GroupList> groups =  new  ArrayList<GroupList>();
         for (  int  i= 0 ; i<mParentMenu.length; i++) {         
             List<GroupList> childs =  new  ArrayList<GroupList>();
             for (  int  j= 0 ; j<mChildMenu[i].length; j++ ) {
                 childs.add( new  GroupListChild(mChildMenu[i][j]));
             }
             groups.add( new  GroupListParent(mParentMenu[i],childs));
         }
                                                                                                                                              
         mAdapter =  new  GroupListAdapter( this ,groups);
         mlistView.setAdapter(mAdapter);
                                                                                                                                                      
         setContentView(mlistView);    
     }
                                                                                                                                              
     @Override
     public  boolean  onChildClick(ExpandableListView parent, View v, int  groupPosition,  int  childPosition,  long  id) {
                                                                                                                                                      
         return  false ;
     }
                                                                                                                                              
     @Override
     public  boolean  onGroupClick(ExpandableListView parent, View v, int  groupPosition,  long  id) {
                                                                                                                                                    
         return  false ;
     }
}


4.  相关的xml文件


（1） grouplist_child.xml 文件


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<? 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 = "horizontal" >
                                                                                                                                      
     < TextView
         android:id = "@+id/GroupListChild"
         android:layout_width = "wrap_content"
         android:layout_height = "wrap_content"
         android:textColor = "#FFFF0000"
         android:layout_margin = "10dp"
         android:layout_centerInParent = "true" />
                                                                                                                                      
</ RelativeLayout >


（2） grouplist_parent.xml 文件


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<? 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 = "horizontal" >
                                                                                                           
     < TextView
         android:id = "@+id/GroupListParent"
         android:layout_width = "wrap_content"
         android:layout_height = "wrap_content"
         android:textColor = "@android:color/black"
         android:textStyle = "bold"
         android:layout_margin = "10dp"
         android:layout_centerInParent = "true" />
                                                                                                           
</ RelativeLayout >




本文转自 Jhuster 51CTO博客，原文链接：http://blog.51cto.com/ticktick/1289642，如需转载请自行联系原作者

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