Android ExpandableListView簡單例子

jopen 11年前發布 | 68K 次閱讀 Android Android開發 移動開發

   android中常常要用到ListView，有時也要用到ExpandableListView，如在手機設置中，對于分類有很好的效果，會用ListView的人一定會用ExpandableListView，因為
 ExpandableListView extends ListView的，下面來看個簡單的例子
 
 運行效果圖：
 

Android ExpandableListView簡單例子

<RelativeLayout xmlns:android="


<ExpandableListView
    android:id="@+id/expendlist"
    android:layout_width="match_parent"
    android:layout_height="wrap_content" >
</ExpandableListView>




</RelativeLayout></pre>


 //擴展ListView的頭List布局文件
 <?xml version="1.0" encoding="utf-8"?>
 <LinearLayout xmlns:android="

<TextView
   android:id="@+id/txt"
   android:layout_width="wrap_content"
   android:layout_height="wrap_content" />


<ImageView
   android:id="@+id/img"
   android:layout_width="wrap_content"
   android:layout_height="wrap_content" />
 </LinearLayout></pre>


 //擴展ListView的子List布局文件
 <?xml version="1.0" encoding="utf-8"?>
 <LinearLayout xmlns:android="

<ImageView
   android:id="@+id/img"
   android:layout_width="20.0dp"
   android:layout_height="20.0dp" />


<TextView
   android:id="@+id/txt"
   android:layout_width="wrap_content"
   android:layout_height="wrap_content" />


</LinearLayout></pre>


package com.example.test;


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


import android.app.Activity;
 import android.content.Context;
 import android.os.Bundle;
 import android.view.View;
 import android.view.ViewGroup;
 import android.widget.BaseExpandableListAdapter;
 import android.widget.ExpandableListView;
 import android.widget.ImageView;
 import android.widget.TextView;


public class MainActivity extends Activity {


private ExpandableListView expandableListView;
 private List<String> group_list;
 private List<List<String>> item_list;
 private List<List<Integer>> item_list2;


@Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);


//隨便一堆測試數據
  group_list = new ArrayList<String>();
  group_list.add("A");
  group_list.add("B");
  group_list.add("C");


item_list = new ArrayList<List<String>>();
  item_list.add(group_list);
  item_list.add(group_list);
  item_list.add(group_list);


List<Integer> tmp_list = new ArrayList<Integer>();
  tmp_list.add(R.drawable.ic_launcher);
  tmp_list.add(R.drawable.ic_launcher);
  tmp_list.add(R.drawable.ic_launcher);


item_list2 = new ArrayList<List<Integer>>();
  item_list2.add(tmp_list);
  item_list2.add(tmp_list);
  item_list2.add(tmp_list);


expandableListView = (ExpandableListView) findViewById(R.id.expendlist);
  expandableListView.setAdapter(new MyExpandableListViewAdapter(this));
 }


//用過ListView的人一定很熟悉，只不過這里是BaseExpandableListAdapter
 class MyExpandableListViewAdapter extends BaseExpandableListAdapter {


private Context context;


public MyExpandableListViewAdapter(Context context) {
   this.context = context;
  }


@Override
  public int getGroupCount() {
   return group_list.size();
  }


@Override
  public int getChildrenCount(int groupPosition) {
   return item_list.get(groupPosition).size();
  }


@Override
  public Object getGroup(int groupPosition) {
   return group_list.get(groupPosition);
  }


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


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


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


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


@Override
  public View getGroupView(int groupPosition, boolean isExpanded,
    View convertView, ViewGroup parent) {
   GroupHolder groupHolder = null;
   if (convertView == null) {
    convertView = (View) getLayoutInflater().from(context).inflate(
      R.layout.expendlist_group, null);
    groupHolder = new GroupHolder();
    groupHolder.txt = (TextView) convertView.findViewById(R.id.txt);
    // groupHolder.img = (ImageView) convertView
    // .findViewById(R.id.img);
    convertView.setTag(groupHolder);
   } else {
    groupHolder = (GroupHolder) convertView.getTag();
   }
   groupHolder.txt.setText(group_list.get(groupPosition));
   return convertView;
  }


@Override
  public View getChildView(int groupPosition, int childPosition,
    boolean isLastChild, View convertView, ViewGroup parent) {
   ItemHolder itemHolder = null;
   if (convertView == null) {
    convertView = (View) getLayoutInflater().from(context).inflate(
      R.layout.expendlist_item, null);
    itemHolder = new ItemHolder();
    itemHolder.txt = (TextView) convertView.findViewById(R.id.txt);
    itemHolder.img = (ImageView) convertView.findViewById(R.id.img);
    convertView.setTag(itemHolder);
   } else {
    itemHolder = (ItemHolder) convertView.getTag();
   }
   itemHolder.txt.setText(item_list.get(groupPosition).get(
     childPosition));
   itemHolder.img.setBackgroundResource(item_list2.get(groupPosition).get(
     childPosition));
   return convertView;
  }


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


}


class GroupHolder {
  public TextView txt;
  public ImageView img;
 }


class ItemHolder {
  public ImageView img;
  public TextView txt;
 }
}</pre>
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