Android 自定义 ExpandableListView

最新推荐文章于 2021-05-27 02:19:22 发布

转载最新推荐文章于 2021-05-27 02:19:22 发布 · 92 阅读

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原文链接：http://www.cnblogs.com/shanzei/archive/2012/03/28/2420957.html

文章标签：

#移动开发 #数据库

本文介绍如何在Android中使用ExpandableListView实现复杂的数据展示。通过自定义Adapter，开发者能够轻松处理分组数据，并通过不同布局文件实现高度定制化的界面。

Android中有一控件是ExpandableListView，比ListView更高级，ExpandableListView的效果很实用，比如因为需要查看一堆文件的目录结构或者开发像QQ好友那样的界面，就应该使用Expandablelistview。

本文最终效果如下：

首先是Activity代码，实际开发中数据（包括父item，子item及图片，Expandablelistview布局也可以轻易更改）可以很方便的从数据库或网络动态取得，本文方便起见数据就先定死了。

public class C_ExpandableListView extends Activity {
    ExpandableListView expandableList; 
public String[] str1 = { "我的好友", "陌生人", "黑名单","yilee","good","哈哈哈" }; 
public String[] str2 = { "我了个去", "哈哈", "蟹", "XX", "我去" }; 
public String[] str3 =  { "哈哈", "蟹", "XX", "我去" }; 
public String[] str4 =  { "我了个去", "蟹", "XX", "我去" }; 
public String[] str5 =  { "我了个去", "蟹", "XX", "我去" }; 
public String[] str6 = { "yilee", "哈哈", "蟹", "XX", "我去" }; 
public String[] str7 =  {  "哈哈", "蟹", "XX", "我去" }; 
    @Override 
public void onCreate(Bundle savedInstanceState) { 
super.onCreate(savedInstanceState); 
        setContentView(R.layout.main); 
        expandableList = (ExpandableListView) C_ExpandableListView.this 
                .findViewById(R.id.ExpandableListView01); 
        expandableList.setAdapter(new TreeViewAdapter(this)); 

    }

public class TreeViewAdapter extends BaseExpandableListAdapter { 
private LayoutInflater inflater; 
private LayoutInflater inflater1;

public TreeViewAdapter(Context c) { 
this.inflater = LayoutInflater.from(c); 
this.inflater1 = LayoutInflater.from(c); 
        }

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

        @Override 
public long getChildId(int groupPosition, int childPosition) { 
return 0; 
        }

        @Override 
public View getChildView(int groupPosition, int childPosition, 
boolean isLastChild, View convertView, ViewGroup parent) { 
            View myView = inflater1.inflate(R.layout.cc, null); 
final int a=groupPosition; 
final int b=childPosition; 
            myView.setBackgroundResource(R.drawable.child); 
            TextView textview = (TextView) myView 
                    .findViewById(R.id.TextView001); 

            textview.setOnClickListener(new OnClickListener() { 

                @Override 
public void onClick(View arg0) { 
                    Log.i("yileeeee", "groupPosition= "+a); 
                    Log.i("yileeeee", "childPosition= "+b); 
                } 
            });        
if(groupPosition==0){ 
                textview.setText(str2[childPosition]); 
            }else if(groupPosition==1){ 
                textview.setText(str3[childPosition]); 
            }else if(groupPosition==2){ 
                textview.setText(str4[childPosition]);    
            }else if(groupPosition==3){ 
                textview.setText(str5[childPosition]);    
            }else if(groupPosition==4){ 
                textview.setText(str6[childPosition]);    
            }else if(groupPosition==5){ 
                textview.setText(str7[childPosition]);    
            }    
return myView; 
        }

        @Override 
public int getChildrenCount(int groupPosition) { 
if(groupPosition==0){ 
return str2.length; 
            }else if(groupPosition==1){ 
return str3.length; 
            }else if(groupPosition==2){ 
return str4.length; 
            }else if(groupPosition==3){ 
return str5.length; 
            }else if(groupPosition==4){ 
return str6.length; 
            }else { 
return str7.length; 
            } 
        }

        @Override 
public Object getGroup(int groupPosition) { 
return "dd"; 
        }

        @Override 
public int getGroupCount() { 
return str1.length; 
        }

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

        @Override 
public View getGroupView(int groupPosition, boolean isExpanded, 
                View convertView, ViewGroup parent) { 
            View myView = inflater.inflate(R.layout.dd, null);

            myView.setBackgroundResource(R.drawable.group); 
            TextView textview = (TextView) myView.findViewById(R.id.TextView01); 
            textview.setText(str1[groupPosition]); 
return myView; 
        }

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

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

其中类TreeViewAdapter是我们的自定义Adapter，继承自BaseExpandableListAdapter。

getChildrenCount比较麻烦,因为么个子item数目并不一样，可以把子数据放入一个String三维数组，这样只需return str[position]，返回的便是子item的数据，样在getChildView在也应该这样设置：textview.setText(str[position][childPosition]);

我们需要三个布局文件，一个是activity里面是ExpandableListView

第二个是描述父item的布局文件

最后一个是描述子item的

这样就可以轻易实现ExpandableListAdapter 高度自定义了。

原文：http://yilee.info/android-diy-xpandablelistview.html

转载于:https://www.cnblogs.com/shanzei/archive/2012/03/28/2420957.html