树形ExpandableListView控件使用

原文：http://blog.csdn.net/ly_rose/article/details/50358433

还有一篇比较完整：http://blog.csdn.net/sysukehan/article/details/51960473

创建工程Android_expandableListView中添加控件ExpandableListView

[html]
view plain
copy

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"  
    xmlns:tools="http://schemas.android.com/tools"  
    android:layout_width="match_parent"  
    android:layout_height="match_parent"  
    android:paddingBottom="@dimen/activity_vertical_margin"  
    android:paddingLeft="@dimen/activity_horizontal_margin"  
    android:paddingRight="@dimen/activity_horizontal_margin"  
    android:paddingTop="@dimen/activity_vertical_margin"  
    tools:context="com.example.android_expandablelistview.MainActivity" >  
  
    <ExpandableListView  
        android:id="@+id/expandableListView1"  
        android:layout_width="match_parent"  
        android:layout_height="wrap_content"  
        android:layout_alignParentLeft="true"  
        android:layout_alignParentTop="true" >  
    </ExpandableListView>  
  
</RelativeLayout>  

[java]
view plain
copy

package com.example.android_expandablelistview;  
  
import java.util.ArrayList;  
import java.util.List;  
  
import android.support.v7.app.ActionBarActivity;  
import android.os.Bundle;  
import android.view.Menu;  
import android.view.MenuItem;  
import android.view.View;  
import android.view.ViewGroup;  
import android.widget.BaseExpandableListAdapter;  
import android.widget.ExpandableListView;  
import android.widget.TextView;  
  
public class MainActivity extends ActionBarActivity {  
  
    private ExpandableListView listView;  
    private MyAdapter adapter;  
    private List<String> group;//组  
    private List<List<String>> child;//子  
      
      
    @Override  
    protected void onCreate(Bundle savedInstanceState) {  
        super.onCreate(savedInstanceState);  
        setContentView(R.layout.activity_main);  
        listView=(ExpandableListView) this.findViewById(R.id.expandableListView1);  
          
        adapter=new MyAdapter();  
        initData();  
        listView.setAdapter(adapter);  
          
        listView.setGroupIndicator(null);//把箭头去掉  
          
    }  
      
    //初始化数据，组和子元素实例化  
    public void initData(){  
        group=new ArrayList<String>();  
        child=new ArrayList<List<String>>();  
          
        addInfo("广东",new String[]{"深圳","珠海","广州"});  
        addInfo("湖北",new String[]{"武汉","孝感","黄冈"});  
        addInfo("河南",new String[]{"郑州","洛阳","商丘"});  
          
    }  
      
    public void addInfo(String g,String[] c){  
        group.add(g);//添加组  
        List<String> list = new ArrayList<String>();  
        for(int i=0;i<c.length;i++){  
            list.add(c[i]);  
        }  
        child.add(list);  
    }  
      
     class MyAdapter extends BaseExpandableListAdapter{  
  
            @Override  
            public int getGroupCount() {  
                // TODO Auto-generated method stub  
                return group.size();  
            }  
  
            @Override  
            public int getChildrenCount(int groupPosition) {  
                // TODO Auto-generated method stub  
                return child.size();  
            }  
  
            @Override  
            public Object getGroup(int groupPosition) {  
                // TODO Auto-generated method stub  
                return group.get(groupPosition);  
            }  
  
            @Override  
            public Object getChild(int groupPosition, int childPosition) {  
                // TODO Auto-generated method stub  
                return child.get(groupPosition).get(childPosition);  
            }  
  
            @Override  
            public long getGroupId(int groupPosition) {  
                // TODO Auto-generated method stub  
                return groupPosition;  
            }  
  
            @Override  
            public long getChildId(int groupPosition, int childPosition) {  
                // TODO Auto-generated method stub  
                return childPosition;  
            }  
  
            @Override  
            public boolean hasStableIds() {  
                // TODO Auto-generated method stub  
                return false;  
            }  
  
            @Override  
            public View getGroupView(int groupPosition, boolean isExpanded,  
                    View convertView, ViewGroup parent) {  
                // TODO Auto-generated method stub  
                  
                TextView textView = null;  
                if(convertView==null){  
                    textView = new TextView(MainActivity.this);  
                }else{  
                    textView = (TextView)convertView;  
                }  
                textView.setText(group.get(groupPosition));  
                textView.setTextSize(30);  
                textView.setPadding(36, 10, 0, 10);  
                return textView;  
            }  
  
            @Override  
            public View getChildView(int groupPosition, int childPosition,  
                    boolean isLastChild, View convertView, ViewGroup parent) {  
                // TODO Auto-generated method stub  
                TextView textView = null;  
                if(convertView==null){  
                    textView = new TextView(MainActivity.this);  
                }else{  
                    textView = (TextView)convertView;  
                }  
                textView.setText(child.get(groupPosition).get(childPosition));  
                textView.setTextSize(20);  
                textView.setPadding(72, 10, 0, 10);  
                return textView;  
            }  
  
            @Override  
            public boolean isChildSelectable(int groupPosition, int childPosition) {  
                // TODO Auto-generated method stub  
                return true;  
            }  
              
        }  
          
  
    @Override  
    public boolean onCreateOptionsMenu(Menu menu) {  
        // Inflate the menu; this adds items to the action bar if it is present.  
        getMenuInflater().inflate(R.menu.main, menu);  
        return true;  
    }  
  
    @Override  
    public boolean onOptionsItemSelected(MenuItem item) {  
        // Handle action bar item clicks here. The action bar will  
        // automatically handle clicks on the Home/Up button, so long  
        // as you specify a parent activity in AndroidManifest.xml.  
        int id = item.getItemId();  
        if (id == R.id.action_settings) {  
            return true;  
        }  
        return super.onOptionsItemSelected(item);  
    }  
}  

运行效果图如下
去掉箭头，加上

[java]
view plain
copy

listView.setGroupIndicator(null);//把箭头去掉