Android ExpandableListView

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ExpandableListVIew 是可展开收起的列表，相关XML属性

android:childDivider 指定各组内各子列表项之间的分隔条

android:chhildIndicator 显示在子列表项旁边的Drawable对象

android:groupIndicator 显示在组列表项旁边的Drawable对象

ExpandableListAdapter有三种常用方式：

1.扩展BaseExpandableListAdapter

2.使用SimpleExpandableListAdapter将两个List集合包装成ExpandableListAdapter

3.使用SimpleCursorTreeAdapter将Cursor中的数据包装成SimpleCursorTreeAdapter

本例程使用第一种方式实现

Item子表列项事件监听：

setOnItemClickListener();

setOnItemSelectedListener();

setOnItemLongClickListener();

package shortcut.song.com.myapplication;import android.database.DataSetObserver;import android.support.v7.app.AppCompatActivity;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.ExpandableListAdapter;import android.widget.ExpandableListView;import android.widget.ImageView;import android.widget.LinearLayout;import android.widget.TextView;import org.w3c.dom.Text;public class ExpandableListViewActivity extends AppCompatActivity {    ExpandableListView mExpandableListView;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_expandable_list_view);        ExpandableListAdapter expandableListAdapter = new BaseExpandableListAdapter() {            private int[] logos = new int[]                    {                            R.drawable.img1,                            R.drawable.img2,                            R.drawable.img3,                    };            private String[] animalTypes = new String[]                    {                        "dog","cat","fish"                    };            private String[][] animal = new String[][]                    {                            {"dog1","dog2","dog3","dog4"},                            {"cat1","cat2","cat3"},                            {"fish1","fish2"}                    };            @Override            public int getGroupCount() {                return animalTypes.length;            }            @Override            public int getChildrenCount(int groupPosition) {                return animal[groupPosition].length;            }            @Override            public Object getGroup(int groupPosition) {                return animalTypes[groupPosition];            }            @Override            public Object getChild(int groupPosition, int childPosition) {                return animal[groupPosition][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;            }            private TextView getTextView()            {                AbsListView.LayoutParams lp = new AbsListView.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, 64);                TextView textView = new TextView(ExpandableListViewActivity.this);                textView.setLayoutParams(lp);                textView.setGravity(Gravity.CENTER_VERTICAL | Gravity.LEFT);                textView.setPadding(36,0,0,0);                textView.setTextSize(20);                return textView;            }            @Override            public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) {                LinearLayout ll = new LinearLayout(ExpandableListViewActivity.this);                ll.setOrientation(LinearLayout.HORIZONTAL);                ImageView logoImage = new ImageView(ExpandableListViewActivity.this);                logoImage.setImageResource(logos[groupPosition]);                ll.addView(logoImage);                TextView textView = getTextView();                textView.setText(getGroup(groupPosition).toString());                ll.addView(textView);                return ll;            }            @Override            public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {                TextView textView = getTextView();                textView.setText(getChild(groupPosition,childPosition).toString());                return textView;            }            @Override            public boolean isChildSelectable(int groupPosition, int childPosition) {                return true;            }        };        mExpandableListView = (ExpandableListView)findViewById(R.id.expandable);        mExpandableListView.setAdapter(expandableListAdapter);    }}

<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:id="@+id/activity_expandable_list_view"    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="shortcut.song.com.myapplication.ExpandableListViewActivity">    <ExpandableListView        android:id="@+id/expandable"        android:layout_width="wrap_content"        android:layout_height="wrap_content"/></RelativeLayout>

效果如下图：

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