[android] expandable listview tutorial

[android] expandable listview tutorial

activity_main.xml

<LinearLayout 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" >

    <ExpandableListView

        android:id="@+id/ex_listview"

        android:layout_width="match_parent"

        android:layout_height="match_parent"

        android:groupIndicator="@drawable/ic_launcher" />

</LinearLayout>

view_list_group.xml

<LinearLayout 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:padding="20dp">

    <TextView

        android:paddingLeft="10dp"

        android:id="@+id/group_item"

        android:layout_width="match_parent"

        android:layout_height="wrap_content" />

</LinearLayout>

view_list_item.xml

<LinearLayout 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:padding="20dp" >

    <TextView

        android:id="@+id/list_item"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:paddingLeft="20dp"

        android:paddingRight="20dp" />

</LinearLayout>

MainActivity.java

package com.example.test;

import java.util.ArrayList;

import java.util.HashMap;

import java.util.List;

import java.util.Map;

import android.app.Activity;

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.ExpandableListView.OnChildClickListener;

import android.widget.ExpandableListView.OnGroupClickListener;

import android.widget.ExpandableListView.OnGroupCollapseListener;

import android.widget.ExpandableListView.OnGroupExpandListener;

import android.widget.TextView;

public class MainActivity extends Activity {

private List<String> mGroup = new ArrayList<String>();

private Map<String, List<String>> mChild = new HashMap<String, List<String>>();

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView( R.layout.activity_main );

        

        init();

        initView();

}

    

    private void init(){

     mGroup.add( "Vegitable" );

     mGroup.add( "Fruit" );

    

     List<String> vegList = new ArrayList<String>();

     vegList.add( "Potato" );

     vegList.add( "Brocoli" );

     vegList.add( "Onion" );

     vegList.add( "Chilli" );

     vegList.add( "Carrot" );

     mChild.put( "Vegitable", vegList );

    

     List<String> fruitList = new ArrayList<String>();

     fruitList.add( "Strawberry" );

     fruitList.add( "Blueberry" );

     fruitList.add( "Grapes" );

     fruitList.add( "Banana" );

     mChild.put( "Fruit", fruitList );

    }

    

    private void initView(){

     ExpandableListView lv = (ExpandableListView) findViewById( R.id.ex_listview );

     ExpandableListAdapter adapter = new ExpandableListAdapter();

     lv.setAdapter( adapter );

    

     lv.setOnChildClickListener( new OnChildClickListener() {

@Override

public boolean onChildClick(ExpandableListView parent, View v, int groupPosition, int childPosition, long id) {

return false;

}

});

     lv.setOnGroupClickListener( new OnGroupClickListener() {

@Override

public boolean onGroupClick(ExpandableListView parent, View v, int groupPosition, long id) {

return false;

}

});

    

     lv.setOnGroupExpandListener( new OnGroupExpandListener() {

@Override

public void onGroupExpand(int groupPosition) {

}

});

    

     lv.setOnGroupCollapseListener( new OnGroupCollapseListener() {

@Override

public void onGroupCollapse(int groupPosition) {

}

});

    }

    private class ExpandableListAdapter extends BaseExpandableListAdapter{

    

@Override

public Object getChild(int groupPosition, int childPosition) {

return mChild.get( mGroup.get( groupPosition ) ).get( childPosition );

}

@Override

public long getChildId(int groupPosition, int childPosition) {

return childPosition;

}

@Override

public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {

if ( convertView == null )

convertView = LayoutInflater.from( MainActivity.this ).inflate( R.layout.view_list_item, null );

((TextView)convertView.findViewById( R.id.list_item )).setText( mChild.get( mGroup.get( groupPosition ) ).get( childPosition ) );

return convertView;

}

@Override

public int getChildrenCount(int groupPosition) {

return mChild.get( mGroup.get( groupPosition ) ).size();

}

@Override

public Object getGroup(int groupPosition) {

return mGroup.get( groupPosition );

}

@Override

public int getGroupCount() {

return mGroup.size();

}

@Override

public long getGroupId(int groupPosition) {

return groupPosition;

}

@Override

public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) {

if ( convertView == null )

convertView = LayoutInflater.from( MainActivity.this ).inflate( R.layout.view_list_group, null );

((TextView)convertView.findViewById( R.id.group_item )).setText( mGroup.get( groupPosition ) );

return convertView;

}

@Override

public boolean hasStableIds() {

return false;

}

@Override

public boolean isChildSelectable(int groupPosition, int childPosition) {

return true;

}

    }

}

-

android:transcriptMode

새로운 아이템이 추가되었을 때 ( notifyDataSetChanged() ) listview 가 어떤 행동을 할지를 선택한다.

1. disabled : 아무 행동도 하지 않는다.

2. normal : 마지막 아이템이 보이는 상황이면 새로운 아이템이 추가될 때 최하단으로 자동 스크롤한다.

3. alwaysScroll : 어떤 조건이든 상관없이, 새로운 아이템이 추가될 떄 최하단으로 자동 스크롤한다.

indicator_selector.xml

<?xml version="1.0" encoding="utf-8"?>

<selector xmlns:android="http://schemas.android.com/apk/res/android" >

    <item

        android:drawable="@drawable/indicator_expanded"

        android:state_expanded="true" />

    <item

        android:drawable="@drawable/indicator_collapsed" />

</selector>

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