android分组列表开发

package cn.zhoulujun;

import android.app.ExpandableListActivity;
import android.os.Bundle;
import android.view.View;
import android.view.Window;
import android.widget.ExpandableListAdapter;
import android.widget.ExpandableListView;
import android.widget.Toast;

import java.util.ArrayList;
import java.util.List;

public class ListGroupExpandableListView extends ExpandableListActivity {
    private String[] group=new String[]{"同学","同事","家人"};
    private String[][] groupDetail=new String[][]{
            {"罗志彪","刘宋","刘定飞","刘丹"},
            {"潘光浩","梁建坤","张晓峰","张无忌"},
            {"周静","李世婕","李世民","李元芳"}
    };

    ExpandableListView expandableListView;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        setContentView(R.layout.list_view);
        expandableListView=(ExpandableListView)findViewById(R.id.expandListView);
        ExpandableListAdapter adapter=new ListAdpater(this,group,groupDetail);
        expandableListView.setAdapter(adapter);
        expandableListView.setOnGroupExpandListener(new ExpandableListView.OnGroupExpandListener() {
            @Override
            public void onGroupExpand(int groupPosition) {

            }
        });
        expandableListView.setOnGroupCollapseListener(new ExpandableListView.OnGroupCollapseListener() {
            @Override
            public void onGroupCollapse(int groupPosition) {

            }
        });
        expandableListView.setOnChildClickListener(new ExpandableListView.OnChildClickListener() {
            @Override
            public boolean onChildClick(ExpandableListView parent, View v, int groupPosition, int childPosition, long id) {
                Toast.makeText(ListGroupExpandableListView.this,group[groupPosition]+":"+groupDetail[groupPosition][childPosition],Toast.LENGTH_SHORT).show();
                return false;
            }
        });


    }

}

package cn.zhoulujun;  import android.app.Activity; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.BaseExpandableListAdapter;  import java.util.ArrayList; import java.util.Objects;  /**  * Created by lujun on 2015-07-22.  */ public class MyExpandableAdapter extends BaseExpandableListAdapter { private Activity activity;  private String[][] childItems;  private LayoutInflater inflater;  private String[] prarentItems,child;   public MyExpandableAdapter(String[] prarentItems, String[][] childItems) { this.prarentItems = prarentItems;  this.childItems = childItems;  } public void setInflater(LayoutInflater inflater,Activity activity){ this.inflater=inflater;  this.activity=activity;  } @Override  public int getGroupCount() { return 0;  } @Override  public int getChildrenCount(int groupPosition) { return 0;  } @Override  public Object getGroup(int groupPosition) { return null;  } @Override  public Object getChild(int groupPosition, int childPosition) { return null;  } @Override  public long getGroupId(int groupPosition) { return 0;  } @Override  public long getChildId(int groupPosition, int childPosition) { return 0;  } @Override  public boolean hasStableIds() { return false;  } @Override  public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) { return null;  } @Override  public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) { child = childItems[groupPosition];  return null;  } @Override  public boolean isChildSelectable(int groupPosition, int childPosition) { return false;  } } 

xmlns:android="http://schemas.android.com/apk/res/android"
                android:orientation="vertical"
                android:id="@+id/ListGroupItem"
                android:layout_width="match_parent"
                android:layout_height="match_parent">
                android:id="@+id/listGroupImage"
            android:layout_width="30dp"
            android:layout_height="40dp"
            android:layout_alignParentLeft="true"
            android:layout_centerVertical="true"
            android:layout_marginLeft="10dp"
            android:src="@drawable/arrow_up"
            android:backgroundTintMode="src_in"/>
                android:id="@+id/listGroupName"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_centerVertical="true"
            android:layout_alignBaseline="@id/listGroupImage"
            android:layout_toRightOf="@+id/listGroupImage"
            android:textSize="24sp"
            android:text="分组名称"/>
                android:id="@+id/listGroupNum"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentRight="true"
            android:layout_alignBottom="@id/listGroupImage"
            android:layout_centerVertical="true"
            android:layout_marginRight="10dp"
            android:text="[10/10]"/>

xmlns:android="http://schemas.android.com/apk/res/android"
              android:orientation="vertical"
              android:layout_width="match_parent"
              android:layout_height="40dp">
                android:id="@+id/listChildAvatar"
            android:layout_width="40dp"
            android:layout_height="40dp"
            android:layout_marginLeft="10dp"
            android:layout_alignParentTop="true"
            android:layout_alignParentLeft="true"
            android:src="@drawable/avatar"
            />
                android:id="@+id/listViewNick"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentTop="true"
            android:layout_toRightOf="@+id/listChildAvatar"
            android:layout_marginLeft="10dp"
            android:text="昵称"
            android:textSize="16sp"/>
                android:id="@+id/listViewTrends"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignLeft="@+id/listViewNick"
            android:layout_alignParentBottom="true"
            android:text="该好友没有最新动态"
            android:textSize="12sp"/>

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