Android kotlin 实现多级树形图之三级列表第三个级列表HORIZONTAL功能

一、实现效果

二、功能类结构图解

三、引入依赖

在app的build.gradle在添加以下代码
1、implementation 'com.github.CymChad:BaseRecyclerViewAdapterHelper:3.0.6'，这个里面带的适配器，直接调用就即可
这依赖包还需要得到要添加，在Project的build.gradle在添加以下代码，不添加就不行

allprojects {
    repositories {
        ...
        maven { url "https://jitpack.io" }//加上
    }
}

四、源码实现

1、3级列表节点适配器

NodeTreeAdapter.kt

package com.example.myapplication3.adapter.node.tree

import com.chad.library.adapter.base.BaseNodeAdapter
import com.chad.library.adapter.base.entity.node.BaseNode
import com.chad.library.adapter.base.module.DraggableModule
import com.example.myapplication3.adapter.node.tree.provider.FirstProvider
import com.example.myapplication3.adapter.node.tree.provider.SecondProvider
import com.example.myapplication3.adapter.node.tree.provider.ThirdProvider
import com.example.myapplication3.entity.node.tree.FirstNode
import com.example.myapplication3.entity.node.tree.SecondNode
import com.example.myapplication3.entity.node.tree.ThirdNode

class NodeTreeAdapter : BaseNodeAdapter()
{

    init {
        addFullSpanNodeProvider(FirstProvider())
        addFullSpanNodeProvider(SecondProvider())
        addNodeProvider(ThirdProvider())
    }

    override fun getItemType(data: List<BaseNode>, position: Int): Int {
        val node = data[position]
        if (node is FirstNode) {
            return 1
        } else if (node is SecondNode) {
            return 2
        } else if (node is ThirdNode) {
            return 3
        }
        return -1
    }

    val EXPAND_COLLAPSE_PAYLOAD = 110
}

2、1~3级列表节点提供类

第一个级节点提供类FirstProvider.kt

package com.example.myapplication3.adapter.node.tree.provider

import android.view.View
import android.widget.ImageView
import com.chad.library.adapter.base.entity.node.BaseNode
import com.chad.library.adapter.base.module.DraggableModule
import com.chad.library.adapter.base.provider.BaseNodeProvider
import com.chad.library.adapter.base.viewholder.BaseViewHolder
import com.example.myapplication3.R
import com.example.myapplication3.adapter.node.tree.NodeTreeAdapter
import com.example.myapplication3.entity.node.tree.FirstNode
import com.example.myapplication3.ext.rotation

class FirstProvider : BaseNodeProvider(){

    override val itemViewType: Int
        get() = 1

    override val layoutId: Int
        get() = R.layout.item_node_first

    override fun convert(helper: BaseViewHolder, data: BaseNode) {
        val entity: FirstNode = data as FirstNode
        helper.setText(R.id.header, entity.title)
        // 增量刷新，使用动画变化箭头
        setArrowSpin(helper, data, false)
    }

    override fun convert(helper: BaseViewHolder, data: BaseNode, payloads: List<Any>) {
        for (payload in payloads) {
            if (payload is Int && payload == NodeTreeAdapter().EXPAND_COLLAPSE_PAYLOAD) {
                // 增量刷新，使用动画变化箭头
                setArrowSpin(helper, data, true)
            }
        }
    }

    override fun onClick(helper: BaseViewHolder, view: View, data: BaseNode, position: Int) {
        getAdapter()!!.expandOrCollapse(position,true,true,NodeTreeAdapter().EXPAND_COLLAPSE_PAYLOAD)
    }

//    override fun onLongClick(helper: BaseViewHolder, view: View, data: BaseNode, position: Int): Boolean {
//        val entity: FirstNode = data as FirstNode
//        if (entity.isExpanded) {
//            view.postDelayed(Runnable {
//                getAdapter()!!.collapse(position)
//            },300)
//        }
        else {
            getAdapter()!!.expandAndCollapseOther(position)
        }
//        return true //只执行长按事件
        return false
//    }

    private fun setArrowSpin(helper: BaseViewHolder, data: BaseNode, isAnimate: Boolean) {
        val entity: FirstNode = data as FirstNode
        val imageView = helper.getView<ImageView>(R.id.ivIcon)
        if (entity.isExpanded) {
            imageView.rotation(90f, isAnimate)
        } else {
            imageView.rotation(0f, isAnimate)
        }
    }
}

布局item_node_first.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="50dp"
    android:layout_centerHorizontal="true"
    android:background="@drawable/ripple_item_select2">

    <ImageView
        android:id="@+id/ivIcon"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerVertical="true"
        app:srcCompat="@drawable/baseline_keyboard_arrow_right_24" />

    <TextView
        android:id="@+id/header"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerVertical="true"
        android:layout_toRightOf="@id/ivIcon"
        android:text="一级标题0"
        android:textColor="@color/black"
        android:textSize="15dp" />

    <View
        android:layout_width="match_parent"
        android:layout_height="0.8dp"
        android:layout_alignParentBottom="true"
        android:background="@color/veeeeee" />
        
RelativeLayout>

ripple_item_select2.xml

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

    <item android:state_pressed="true">
        <shape android:shape="rectangle">
            <solid android:color="@color/colorRipple" />
        shape>
    item>
    <item>
        <shape android:shape="rectangle">
            <solid android:color="@color/bgColorPrimary" />
        shape>
    item>

selector>

箭头布局baseline_keyboard_arrow_right_24.xml

<vector xmlns:android="http://schemas.android.com/apk/res/android"
    android:width="24dp"
    android:height="24dp"
    android:tint="#C0C0C0"
    android:viewportWidth="24"
    android:viewportHeight="24">
    <path
        android:fillColor="@android:color/white"
        android:pathData="M8.59,16.59L13.17,12 8.59,7.41 10,6l6,6 -6,6 -1.41,-1.41z" />
vector>

第二个级节点提供类SecondProvider.kt

package com.example.myapplication3.adapter.node.tree.provider

import android.view.View
import com.chad.library.adapter.base.entity.node.BaseNode
import com.chad.library.adapter.base.provider.BaseNodeProvider
import com.chad.library.adapter.base.viewholder.BaseViewHolder
import com.example.myapplication3.R
import com.example.myapplication3.entity.node.tree.SecondNode
import kotlinx.android.synthetic.main.item_node_second.view.title

class SecondProvider : BaseNodeProvider() {

    override val itemViewType: Int
        get() = 2
    override val layoutId: Int
        get() = R.layout.item_node_second

    override fun convert(helper: BaseViewHolder, data: BaseNode) {
        val entity: SecondNode = data as SecondNode
        helper.itemView.run { title.text = entity.title }
    }

    override fun onClick(helper: BaseViewHolder, view: View, data: BaseNode, position: Int) {
//        val entity = data as SecondNode
//        if (entity.isExpanded) {
//            getAdapter()?.collapse(position)
//        } else {
//            getAdapter()?.expandAndCollapseOther(position)
//        }
    }
}

item_node_second.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="60dp"
    android:layout_marginBottom="1dp"
    android:background="#F7F7F7"
    android:gravity="center_vertical"
    android:orientation="horizontal">

    <ImageView
        android:id="@+id/iv_head"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginLeft="40dp"
        android:paddingLeft="8dp"
        android:paddingRight="8dp"
        android:src="@mipmap/ic_c" />

    <TextView
        android:id="@+id/title"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:textColor="@android:color/black"
        android:textSize="15dp"/>

    <ImageView
        android:id="@+id/iv"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="right|center"
        android:paddingRight="16dp"
        android:src="@drawable/baseline_keyboard_arrow_right_24" />
LinearLayout>

第三个级节点提供类ThirdProvider.kt

package com.example.myapplication3.adapter.node.tree.provider

import com.chad.library.adapter.base.entity.node.BaseNode
import com.chad.library.adapter.base.provider.BaseNodeProvider
import com.chad.library.adapter.base.viewholder.BaseViewHolder
import com.example.myapplication3.R
import com.example.myapplication3.entity.node.tree.ThirdNode
import kotlinx.android.synthetic.main.item_node_third.view.title

class ThirdProvider : BaseNodeProvider() {

    override val itemViewType: Int
        get() = 3

    override val layoutId: Int
        get() = R.layout.item_node_third

    override fun convert(helper: BaseViewHolder, data: BaseNode) {
        val entity: ThirdNode = data as ThirdNode
        helper.itemView.run { title.text = entity.title }
    }
}

item_node_third.xml

<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:background="#E7E7E7">

    <RelativeLayout
        android:id="@+id/rl"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="@color/white"
        android:layout_margin="10dp">

        <ImageView
            android:id="@+id/iv"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:scaleType="fitXY"
            android:layout_centerHorizontal="true"
            android:src="@mipmap/ic_c"/>

        <TextView
            android:id="@+id/title"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_below="@id/iv"
            android:layout_centerHorizontal="true"
            android:layout_marginTop="5.0dip"
            android:text="测试"
            android:textSize="@dimen/sp_14" />
    RelativeLayout>
RelativeLayout>

3、1~3级列表实体类

第一个级列表FirstNode.java

package com.example.myapplication3.entity.node.tree;

import com.chad.library.adapter.base.entity.node.BaseExpandNode;
import com.chad.library.adapter.base.entity.node.BaseNode;

import org.jetbrains.annotations.Nullable;

import java.util.List;

public class FirstNode extends BaseExpandNode {

    private List<BaseNode> childNode;
    private String title;

    public FirstNode(List<BaseNode> childNode, String title) {
        this.childNode = childNode;
        this.title = title;

        setExpanded(false);
    }

    public String getTitle() {
        return title;
    }


    @Nullable
    @Override
    public List<BaseNode> getChildNode() {
        return childNode;
    }
}

第二个级列表SecondNode.java

package com.example.myapplication3.entity.node.tree;

import com.chad.library.adapter.base.entity.node.BaseExpandNode;
import com.chad.library.adapter.base.entity.node.BaseNode;

import org.jetbrains.annotations.Nullable;

import java.util.List;

public class SecondNode extends BaseExpandNode {

    private List<BaseNode> childNode;
    private String title;

    public SecondNode(List<BaseNode> childNode, String title) {
        this.childNode = childNode;
        this.title = title;

        setExpanded(false);
    }

    public String getTitle() {
        return title;
    }

    @Nullable
    @Override
    public List<BaseNode> getChildNode() {
        return childNode;
    }
}

第三个级列表ThirdNode.java

package com.example.myapplication3.entity.node.tree;

import com.chad.library.adapter.base.entity.node.BaseNode;

import org.jetbrains.annotations.Nullable;

import java.util.List;

public class ThirdNode extends BaseNode {
    private String title;

    public ThirdNode(String title) {
        this.title = title;
    }

    public String getTitle() {
        return title;
    }

    @Nullable
    @Override
    public List<BaseNode> getChildNode() {
        return null;
    }
}

4、箭头旋转动画

ViewExt.kt

package com.example.myapplication3.ext

import android.view.View
import android.view.animation.DecelerateInterpolator
import androidx.core.view.ViewCompat

/**
 * 旋转
 * @param value 角度
 * @param isAnimate 动画
 */
fun View.rotation(value:Float, isAnimate: Boolean){
    if (isAnimate) {
        ViewCompat.animate(this).setDuration(200)
            .setInterpolator(DecelerateInterpolator())
            .rotation(value)
            .start()
    } else {
        this.rotation = value
    }
}

5、主activity

MainActivity.kt

package com.example.myapplication3

import android.os.Bundle
import androidx.appcompat.app.AppCompatActivity
import androidx.recyclerview.widget.GridLayoutManager
import com.chad.library.adapter.base.entity.node.BaseNode
import com.example.myapplication3.adapter.node.tree.NodeTreeAdapter
import com.example.myapplication3.entity.node.tree.FirstNode
import com.example.myapplication3.entity.node.tree.SecondNode
import com.example.myapplication3.entity.node.tree.ThirdNode
import kotlinx.android.synthetic.main.activity_main.rv_list

class MainActivity : AppCompatActivity() {
    private val mAdapter by lazy {
        NodeTreeAdapter().apply {

        }
    }

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        initView()
        initData()
    }

    private fun initView() {
        rv_list.layoutManager = GridLayoutManager(this@MainActivity, 4)
        rv_list.adapter = mAdapter
    }

    private fun initData() {
        mAdapter.setList(getEntity())
    }

    private fun getEntity(): MutableList<BaseNode>? {
        val list: MutableList<BaseNode> = ArrayList()
        for (i in 0..4) {
            val secondNodeList: MutableList<BaseNode> = ArrayList()

            if (i == 2) {
                for (n in 0..1) {
                    val thirdNodeList: MutableList<BaseNode> = ArrayList()
                    for (t in 0..3) {
                        val node = ThirdNode("三级标题$t")
                        thirdNodeList.add(node)
                    }
                    val seNode = SecondNode(thirdNodeList, "二级标题$n")
                    seNode.isExpanded = true
                    secondNodeList.add(seNode)
                }
            } else {
                val thirdNodeList: MutableList<BaseNode> = ArrayList()
                for (t in 0..3) {
                    val node = ThirdNode("三级标题$t")
                    thirdNodeList.add(node)
                }
                val seNode = SecondNode(thirdNodeList, "二级标题0")
                seNode.isExpanded = true
                secondNodeList.add(seNode)
            }

            val entity = FirstNode(secondNodeList, "一级标题$i")
            // 模拟 默认第0个是展开的
            entity.isExpanded = false
            list.add(entity)
        }
        return list
    }
}

activity_main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@color/bg"
    android:orientation="vertical">

    

    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/rv_list"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:layoutManager="androidx.recyclerview.widget.GridLayoutManager"/>
LinearLayout>