android好友多级列表显示Expandabl…

例如在显示群组信息的时候，我们往往需要点击群组之后能够出现该群组详细列表，这里可以采用ExpandableListView这个控件来实现，其实如果会了ListView 以及 BaseAdapter的重写，那么这个很快就可以掌握了，只不过再多设计一个父类的显示吧了。

就不美化了，直接看吧。。。

 

看代码

Main.xml

<?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" >       <ExpandableListView         android:id="@+id/expand"         android:layout_width="fill_parent"         android:layout_height="wrap_content"         ></ExpandableListView>   </LinearLayout>

 

这里有点说明：如果你要使用原来自带的@id/listview 那么就必须继承ExpandableListActivity

 

Parent.xml

<?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" >       <TextView         android:id="@+id/parent"         android:layout_width="fill_parent"         android:layout_height="wrap_content"         />   </LinearLayout>

 

Child.xml

<?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" >       <LinearLayout         android:id="@+id/child"         android:layout_height="wrap_content"         android:layout_width="fill_parent">             </LinearLayout>   </LinearLayout>

 

 

 

下面就是MainActivity  主要看下Adapter怎么实现的，这里children里是各个child，有点嵌套，别晕了。。

package com.ylf;   import java.util.ArrayList; import java.util.List;   import android.app.Activity; import android.app.ExpandableListActivity; import android.os.Bundle; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.BaseExpandableListAdapter; import android.widget.ExpandableListView; import android.widget.LinearLayout; import android.widget.TextView;   public class MainActivity extends Activity {              List<String> parents = null;          List<List> children = null;                   ExpandableListView listView = null;     @Override     public void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         setContentView(R.layout.main);                 listView = (ExpandableListView)findViewById(R.id.expand);                 parents = new ArrayList<String>();         children = new ArrayList<List>();                 List<String> children1 =new ArrayList<String>();         List<String> children2 =new ArrayList<String>();         List<String> children3 =new ArrayList<String>();         List<String> children4 =new ArrayList<String>();                 parents.add("水果");         parents.add("蔬菜");         parents.add("卫生间");         parents.add("垃圾堆");                 children1.add("香蕉");         children1.add("苹果");         children2.add("空心菜");         children2.add("西红柿");         children3.add("马桶");         children3.add("水池");         children4.add("屎虫");         children4.add("苍蝇");                 children.add(children1);         children.add(children2);         children.add(children3);         children.add(children4);                 listView.setAdapter(new MyExpandableListAdapter());         listView.setGroupIndicator(null);     }     class MyExpandableListAdapter extends BaseExpandableListAdapter{                    @Override                    public Object getChild(int arg0, int arg1) {                             return children.get(arg0).get(arg1);                    }                      @Override                    public long getChildId(int arg0, int arg1) {                             return arg0*parents.size()+arg1;                    }                      @Override                    public View getChildView(int parentCount, int childCount, boolean arg2, View arg3,                                      ViewGroup arg4) {                             LayoutInflater inflater = LayoutInflater.from(MainActivity.this);                             View view = inflater.inflate(R.layout.child, null);                             LinearLayout ll = (LinearLayout)view.findViewById(R.id.child);                             TextView tv = new TextView(MainActivity.this);                             tv.setPadding(60, 5, 5, 5);                             tv.setText((String)getChild(parentCount, childCount));                             ll.addView(tv);                             ll.setPadding(5, 5, 5, 5);                                                         return view;                    }                      @Override                    public int getChildrenCount(int groupPosition) {                             return children.get(groupPosition).size();                    }                      @Override                    public Object getGroup(int groupPosition) {                             return parents.get(groupPosition);                    }                      @Override                    public int getGroupCount() {                             return parents.size();                    }                      @Override                    public long getGroupId(int groupPosition) {                             return groupPosition;                    }                      @Override                    public View getGroupView(int groupPosition, boolean isExpanded,                                      View convertView, ViewGroup parent) {                             LayoutInflater inflater = LayoutInflater.from(MainActivity.this);                             View view = inflater.inflate(R.layout.parent, null);                             TextView tv = (TextView)view.findViewById(R.id.parent);                                                         tv.setPadding(50, 5, 5, 5);                             tv.setText((String)getGroup(groupPosition));                             return view;                    }                      @Override                    public boolean hasStableIds() {                             return false;                    }                      @Override                    public boolean isChildSelectable(int groupPosition, int childPosition) {                             return false;                    }                  } }