使用ExpandableListView

使用ExpandableListView

博客分类：
• Android

效果图

 

Group右边的图标是Android系统自动加上的默认图标

 

 

 

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
  xmlns:android="http://schemas.android.com/apk/res/android"
  android:orientation="vertical"
  android:layout_width="match_parent"
  android:layout_height="match_parent">
    <ExpandableListView android:id="@+id/expandable_list_view"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />
</LinearLayout>

 

 

package com.improve;
import android.app.Activity;
import android.os.Bundle;
import android.view.Gravity;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AbsListView;
import android.widget.BaseExpandableListAdapter;
import android.widget.ExpandableListView;
import android.widget.ExpandableListView.OnChildClickListener;
import android.widget.ExpandableListView.OnGroupCollapseListener;
import android.widget.ExpandableListView.OnGroupExpandListener;
import android.widget.Toast;
import android.widget.ExpandableListView.OnGroupClickListener;
import android.widget.TextView;

/**
 * ExpandableListView只能是两级层次
 * @author Davee
 */
public class ExpandableListViewDemo extends Activity {
    private List<String> groupData;
    private List<List<String>> childrenData;
    private void loadData() {
        groupData = new ArrayList<String>();
        groupData.add("Group 1");
        groupData.add("Group 2");
        groupData.add("Group 3");

        childrenData = new ArrayList<List<String>>();
        List<String> sub1 = new ArrayList<String>();
        sub1.add("G1 Item 1");
        sub1.add("G1 Item 2");
        childrenData.add(sub1);
        List<String> sub2 = new ArrayList<String>();
        sub2.add("G2 Item 1");
        sub2.add("G2 Item 2");
        sub2.add("G2 Item 3");
        sub2.add("G2 Item 4");
        childrenData.add(sub2);
        List<String> sub3 = new ArrayList<String>();
        sub3.add("G3 Item 1");
        sub3.add("G3 Item 2");
        sub3.add("G3 Item 3");
        sub3.add("G3 Item 4");
        sub3.add("G3 Item 5");
        childrenData.add(sub3);
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.expandable_list_view);

        loadData();

        ExpandableListView expandableListView = (ExpandableListView)findViewById(R.id.expandable_list_view);
        expandableListView.setAdapter(new ExpandableAdapter());
        expandableListView.setOnGroupClickListener(new OnGroupClickListener() {
            @Override
            public boolean onGroupClick(ExpandableListView parent, View clickedView, int groupPosition, long groupId) {
                showMessage("点击Group: " + ((TextView)clickedView).getText());
                return false;//返回true表示此事件在此被处理了
            }
        });
        expandableListView.setOnChildClickListener(new OnChildClickListener() {
            @Override
            public boolean onChildClick(ExpandableListView expandablelistview,
                    View clickedView, int groupPosition, int childPosition, long childId) {
                showMessage("点击Child: " + ((TextView)clickedView).getText());
                return false;//返回true表示此事件在此被处理了
            }
        });
        expandableListView.setOnGroupCollapseListener(new OnGroupCollapseListener() {
            @Override
            public void onGroupCollapse(int groupPosition) {
                showMessage("合拢Group: " + (groupPosition + 1));
            }
        });
        expandableListView.setOnGroupExpandListener(new OnGroupExpandListener() {
            @Override
            public void onGroupExpand(int groupPosition) {
                showMessage("展开Group: " + (groupPosition + 1));
            }
        });
    }

    private class ExpandableAdapter extends BaseExpandableListAdapter {

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

        @Override
        public long getChildId(int groupPosition, int childPosition) {
            return 0;
        }

        @Override
        public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {
            TextView text = null;
            if (convertView != null) {
                text = (TextView)convertView;
                text.setText(childrenData.get(groupPosition).get(childPosition));
            } else {
                text = createView(childrenData.get(groupPosition).get(childPosition));
            }
            return text;
        }

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

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

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

        @Override
        public long getGroupId(int groupPosition) {
            return 0;
        }

        @Override
        public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) {
            TextView text = null;
            if (convertView != null) {
                text = (TextView)convertView;
                text.setText(groupData.get(groupPosition));
            } else {
                text = createView(groupData.get(groupPosition));
            }
            return text;
        }

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

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

        private TextView createView(String content) {
            AbsListView.LayoutParams layoutParams = new AbsListView.LayoutParams(
                    ViewGroup.LayoutParams.FILL_PARENT, 38);
            TextView text = new TextView(ExpandableListViewDemo.this);
            text.setLayoutParams(layoutParams);
            text.setGravity(Gravity.CENTER_VERTICAL | Gravity.LEFT);
            text.setPadding(40, 0, 0, 0);
            text.setText(content);
            return text;
        }
    }

    private void showMessage(String message) {
        Toast.makeText(this, message, Toast.LENGTH_SHORT).show();
    }
}

 

 

在上面效果图中，图标是系统自动加上的，也可以定义自己的图标

效果图

 

增加drawable文件

 

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:state_expanded="true" android:drawable="@drawable/narrow_expand" />
    <item android:drawable="@drawable/narrow_unexpand" />
</selector>

 

修改布局

 

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
  xmlns:android="http://schemas.android.com/apk/res/android"
  android:orientation="vertical"
  android:layout_width="match_parent"
  android:layout_height="match_parent">
    <ExpandableListView android:id="@+id/expandable_list_view"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:groupIndicator="@drawable/group_icon_selector" />
</LinearLayout>