分组伸缩展开列表

效果图

原理说明：

• 最外层为ScrollView，包裹其他显示内容+分组列表（采用第三方ListView：NestFullListView）
• 分组列表采用LinearLayout左右布局，左边控制展开/收缩控件为CheckBox，中间为分割线，右边列表同样采用NestFullListView
• 收缩/展开通过重新创建不同数据量的Adapter设置给NestFullListView

NestFullListView

点击查看NestFullListView用法

我在这个项目中只是复制了NestFullListView当中的NestFullListView.java、NestFullListViewAdapter.java、NestFullViewHolder.java三个文件来使用。

代码

因为使用比较简单，所以直接贴上代码

1、该页面xml布局文件

<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.NestedScrollView 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"
    tools:context="com.example.zpf.animmenu.GroupListActivity">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical">

        <FrameLayout
            android:layout_width="match_parent"
            android:layout_height="180dp"
            android:background="#e671df">

            <TextView
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_gravity="center"
                android:text="这个就是当做其他的布局，所以很随意啦"
                android:gravity="center"
                android:textColor="#ffffff"
                tools:ignore="HardcodedText" />
        </FrameLayout>

        <TextView
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:padding="16dp"
            android:text="给个标题"
            android:background="#dadada"
            android:lines="1"
            android:textSize="12sp"/>

        <customview.nestfulllistview.NestFullListView
            android:id="@+id/nflv_group"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="vertical"
            android:divider="@drawable/shape_divider_group"
            android:showDividers="middle"/>
    </LinearLayout>

</android.support.v4.widget.NestedScrollView>

2、页面的java代码

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.TextView;
import android.widget.Toast;

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

import customview.nestfulllistview.NestFullListView;
import customview.nestfulllistview.NestFullListViewAdapter;
import customview.nestfulllistview.NestFullViewHolder;
import model.GroupItemModel;
import model.GroupModel;

public class GroupListActivity extends AppCompatActivity {
    
    

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

        initView();
    }

    private void initView() {

        //制造假数据
        ArrayList<GroupModel> groupModels = new ArrayList<>();
        for (int i=0; i<5; i++) {

            GroupModel groupModel = new GroupModel();
            String groupTitle = "第" + i + "组";
            groupModel.setGroupTitle(groupTitle);

            ArrayList<GroupItemModel> itemModels = new ArrayList<>();
            for (int j=0; j<5; j++) {

                GroupItemModel itemModel = new GroupItemModel();
                itemModel.setTitle(groupTitle + j + "分队");
                itemModel.setUrl("这是是url你晓得不?第" + j + "条");

                itemModels.add(itemModel);
            }

            groupModel.setItemModels(itemModels);
            groupModels.add(groupModel);
        }

        //NestFullListView的使用请参考Github，项目地址：https://github.com/mcxtzhang/NestFullListView
        NestFullListView nestFullListView = (NestFullListView) findViewById(R.id.nflv_group);
        nestFullListView.setAdapter(
                new NestFullListViewAdapter<GroupModel>(R.layout.item_group_nflv, groupModels) {
                    @Override
                    public void onBind(int pos, GroupModel groupModel, NestFullViewHolder holder) {

                        holder.setText(R.id.cb_nflv, groupModel.getGroupTitle());

                        final NestFullListView nflvInner = holder.getView(R.id.nflv_inner);

                        final List<GroupItemModel> itemModels = groupModel.getItemModels();
                        nflvInner.setAdapter(getInnerAdapter(itemModels, false));

                        CheckBox cb = holder.getView(R.id.cb_nflv);
                        cb.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
                            @Override
                            public void onCheckedChanged(CompoundButton compoundButton, boolean b) {

                                nflvInner.setAdapter(getInnerAdapter(itemModels, b));
                            }
                        });

                    }
                });

    }

    /**
     * 重新获取要设置显示的Adapter
     * @param isChecked 展开、收缩CheckBox是否选中,默认不展开
     * */
    private NestFullListViewAdapter<GroupItemModel> getInnerAdapter(
            List<GroupItemModel> models, boolean isChecked) {

        if (models == null)
            return null;

        //展开显示全部数据，未展开显示两条数据
        List<GroupItemModel> showModels = isChecked ? models :
                (models.size() > 2 ? models.subList(0, 2) : models);

        NestFullListViewAdapter<GroupItemModel> adapter =
                new NestFullListViewAdapter<GroupItemModel>(R.layout.item_group_item_nflv, showModels) {
                    @Override
                    public void onBind(int pos, GroupItemModel groupItemModel, NestFullViewHolder holder) {

                        TextView tv = holder.getView(R.id.tv_group_inner);
                        tv.setText(groupItemModel.getTitle());

                        final String url = groupItemModel.getUrl();
                        tv.setOnClickListener(new View.OnClickListener() {
                            @Override
                            public void onClick(View view) {

                                Toast.makeText(GroupListActivity.this, url, Toast.LENGTH_SHORT).show();
                            }
                        });
                    }
                };

        return adapter;
    }
}

3、第一层分组item布局文件

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="horizontal"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="center_vertical">

    <CheckBox
        android:id="@+id/cb_nflv"
        android:layout_width="0dp"
        android:layout_weight="1"
        android:gravity="center"
        android:layout_height="wrap_content"
        android:button="@null"
        android:drawableTop="@mipmap/ic_nflv_group_icon"
        android:drawablePadding="4dp"
        android:drawableBottom="@drawable/selector_nflv_checkbox_arrow"/>

    <View
        android:layout_width="0.4dp"
        android:layout_height="match_parent"
        android:background="#dadada"/>

    <customview.nestfulllistview.NestFullListView
        android:id="@+id/nflv_inner"
        android:layout_width="0dp"
        android:layout_weight="4"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        android:showDividers="middle"/>

</LinearLayout>

4、单个分组内层内容item布局文件（仅仅是一个TextView）

<?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="48dp">

    <TextView
        android:id="@+id/tv_group_inner"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:gravity="center_vertical"
        android:drawableRight="@mipmap/ic_arrow_right_group"
        android:paddingLeft="16dp"
        android:paddingRight="16dp"/>

</LinearLayout>

5、代码当中用到的分割线Drawable和CheckBox切换Selector还有图片大家可以自行编写、找图替换。

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That’s all!代码量不多，NestFullListView的使用也不难，具体使用可以参看作者的github。希望这篇博文可以帮助到需要的同仁。