android-基础编程-ExpandableListview

ExpandableListView继承ListView，具有LIstVIew的基本功能。此外具有group/child，由组与子元素组成。

1.布局主要有是三个。

a.主布局：

<ExpandableListView

        android:layout_width="match_parent"

        android:layout_height="match_parent"

        android:id="@+id/expandlistview"

        android:dividerHeight="5dp"

        android:background="#ffffff"

        android:divider="@drawable/expandchilddivide"

        android:childDivider="#000000"

         />

b.Group布局：

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

    android:layout_width="match_parent"

    android:layout_height="wrap_content"

    android:gravity="center"

    android:orientation="vertical" >

    <TextView

        android:id="@+id/group_text"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:paddingTop="10dip"

        android:paddingBottom="10dip"

        android:gravity="center_horizontal"

        android:text="122"

        />

</LinearLayout>

c.Child布局：

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

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:orientation="horizontal" >

    <LinearLayout

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:orientation="vertical"

        >

        <TextView

            android:id="@+id/textOne"

            android:layout_width="match_parent"

            android:layout_height="match_parent"

            android:text="1"

            />

        <TextView

            android:id="@+id/textTwo"

            android:layout_width="match_parent"

            android:layout_height="match_parent"

            android:text="2"

            />

        <TextView

            android:id="@+id/textThree"

            android:layout_width="match_parent"

            android:layout_height="match_parent"

            android:text="3"

            />

    </LinearLayout>

</LinearLayout>

2.代码生成类似adapter 创建adapter（ExpandableListAdapter、BaseExpandableListAdapter、SimpleExpandableListAdapter 依次继承关系）

a.创建adapter

//自定义适配器

    class Adapter extends BaseExpandableListAdapter {

        //获取子元素对象

        @Override

        public Object getChild(int groupPosition, int childPosition) {

            return null;

        }

        //获取子元素Id

        @Override

        public long getChildId(int groupPosition, int childPosition) {

            return childPosition;

        }

        //加载子元素并显示

        @Override

        public View getChildView(final int groupPosition, final int childPosition,

                                 boolean isLastChild, View convertView, ViewGroup parent) {

            View view = null;

            ChildHolder childholder = null;

            if (convertView != null) {

                view = convertView;

                childholder = (ChildHolder) view.getTag();

            } else {

                view = View.inflate(ExpandableListViewActi.this, R.layout.expand_child, null);

                childholder = new ChildHolder();

                //childholder.mImage = (ImageView) view.findViewById(R.id.image);

                childholder.mPrice = (TextView) view.findViewById(R.id.textTwo);

                childholder.mStateText = (TextView) view.findViewById(R.id.textOne);

                childholder.mSecondPrice = (TextView) view.findViewById(R.id.textThree);

                view.setTag(childholder);

            }

//            childholder.mImage.setOnClickListener(new OnClickListener() {

//                @Override

//                public void onClick(View v) {

//                    Toast.makeText(MainActivity.this, "第"+groupPosition+"组的第"+childPosition+"圖標被点击了", 0).show();

//                }

//            });

            childholder.mPrice.setText(child_list.get(groupPosition));

            int len = group_list.size();

            System.out.println(len + "-----------------");

            childholder.mStateText.setText(child_list.get(groupPosition));

            childholder.mSecondPrice.setText(child_list.get(groupPosition));

            return view;

        }

        //获取子元素数目

        @Override

        public int getChildrenCount(int groupPosition) {

            return child_list.size();

        }

        //获取组元素对象

        @Override

        public Object getGroup(int groupPosition) {

            return group_list.get(groupPosition);

        }

        //获取组元素数目

        @Override

        public int getGroupCount() {

            return group_list.size();

        }

        //获取组元素Id

        @Override

        public long getGroupId(int groupPosition) {

            return groupPosition;

        }

        //加载并显示组元素

        @Override

        public View getGroupView(int groupPosition, boolean isExpanded,

                                 View convertView, ViewGroup parent) {

            View view = null;

            GroupHolder groupholder = null;

            if (convertView != null) {

                view = convertView;

                groupholder = (GroupHolder) view.getTag();

            } else {

                view = View.inflate(ExpandableListViewActi.this, R.layout.expand_group, null);

                groupholder = new GroupHolder();

                groupholder.mSpaceText = (TextView) view.findViewById(R.id.group_text);

                view.setTag(groupholder);

            }

            groupholder.mSpaceText.setText(group_list.get(groupPosition));

            return view;

        }

        @Override

        public boolean hasStableIds() {

            return true;

        }

        @Override

        public boolean isChildSelectable(int groupPosition, int childPosition) {

            return true;

        }

    }

b.生成主界面代码，设置adapter .expandable四中点击相应事件。

private void initView() {

        mListView = (ExpandableListView) findViewById(R.id.expandlistview);

        mInflater = LayoutInflater.from(ExpandableListViewActi.this);

        group_list = new ArrayList<String>();

        for (int i = 0; i < 5; i++) {

            group_list.add("zcx");

            child_list.add("child");

        }

        Adapter adapter = new Adapter();

        //mListView.setGroupIndicator(null);

        /**

         * ExpandableListView的组监听事件

         */

//        mListView.setOnGroupClickListener(new ExpandableListView.OnGroupClickListener() {

//

//            @Override

//            public boolean onGroupClick(ExpandableListView parent, View v,

//                                        int groupPosition, long id) {

//                Toast.makeText(ExpandableListViewActi.this, "第" + groupPosition + "组被点击了", 0).show();

//                return true;

//            }

//        });

        /**

         * ExpandableListView的组展开监听

         */

        mListView.setOnGroupExpandListener(new ExpandableListView.OnGroupExpandListener() {

            @Override

            public void onGroupExpand(int groupPosition) {

                Toast.makeText(ExpandableListViewActi.this, "第" + groupPosition + "组展开", 0).show();

            }

        });

        /**

         * ExpandableListView的组合拢监听

         */

        mListView.setOnGroupCollapseListener(new ExpandableListView.OnGroupCollapseListener() {

            @Override

            public void onGroupCollapse(int groupPosition) {

                Toast.makeText(ExpandableListViewActi.this, "第" + groupPosition + "组合拢", 0).show();

            }

        });

        /**

         * ExpandableListView的子元素点击监听

         */

        mListView.setOnChildClickListener(new ExpandableListView.OnChildClickListener() {

            @Override

            public boolean onChildClick(ExpandableListView parent, View v,

                                        int groupPosition, int childPosition, long id) {

                Toast.makeText(ExpandableListViewActi.this, "第" + groupPosition + "组的第" + childPosition + "被点击了", 0).show();

                return true;

            }

        });

        mListView.setAdapter(adapter);

//        int groupCount = mListView.getCount();

//        for(int i=0;i<groupCount;i++){

//            mListView.expandGroup(i);

//        }

    }

3.效果图

巴特西

android-基础编程-ExpandableListview

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