使用TabLayout和ViewPager2制作导航页面

编写的页面效果如下，可以左右滑动以及进行点击，页面布局由Fragment编写

一、引入相关依赖：

implementation com.google.android.material:material:1.0.0
implementation androidx.viewpager2:viewpager2:1.0.0

二、布局文件：

1、整体布局文件activity_make_money.xml

<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/make_money_drawable"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <LinearLayout
        android:id="@+id/make_money_content"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical"
        android:visibility="visible">
        <com.google.android.material.tabs.TabLayout
            android:id="@+id/make_money_content_tab"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:background="@color/white"
            app:tabIndicatorHeight="0dp"/>
        <androidx.viewpager2.widget.ViewPager2
            android:id="@+id/make_money_content_vp"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_marginTop="@dimen/dd_dp10"/>
    LinearLayout>
LinearLayout>

2、编写选项卡的item布局文件item_make_money_task_tab.xml

<FrameLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <TextView
        android:id="@+id/make_money_tab_tv"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        tools:text="选项卡一"/>
FrameLayout>

3、编写ViewPager2的item布局文件fragment_make_money_task.xml

这里只编写一个作为示例

<FrameLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:text="布局内容"/>
FrameLayout>

二、编写类文件

1、编写Activity文件

package com.wd.daquan.explore.activity

import android.view.View
import android.widget.TextView
import androidx.core.view.GravityCompat
import androidx.fragment.app.Fragment
import androidx.recyclerview.widget.GridLayoutManager
import androidx.viewpager2.widget.ViewPager2
import com.google.android.material.tabs.TabLayout
import com.wd.daquan.R
import kotlinx.android.synthetic.main.activity_make_money.*
import com.wd.daquan.explore.adapter.MakeMoneyPagerAdapter
/**
 * 赚钱页面
 */
class MakeMoneyActivity: FragmentAdtivity(){
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_make_money)
        initView()
    }
     fun initView() {
        initViewViewPager()
        initTabAndPagerListener(make_money_content_tab,make_money_content_vp)
        initTab(arrayListOf("综合","最新","佣金","我的"),make_money_content_tab)
    }
    private fun initViewViewPager(){
        val fragmentList = arrayListOf<Fragment>()
        fragmentList.add(MakeMoneyTaskFragment())
        fragmentList.add(MakeMoneyTaskFragment())
        fragmentList.add(MakeMoneyTaskFragment())
        fragmentList.add(MakeMoneyTaskFragment())
        val pagerAdapter = MakeMoneyPagerAdapter(this)
        pagerAdapter.fragments = fragmentList
        make_money_content_vp.adapter = pagerAdapter
    }

    /**
     * 初始化Tab选项卡
     */
    private fun initTab(nameList :List<String>, tabLayout: TabLayout){
        nameList.forEach {
            val view = layoutInflater.inflate(R.layout.item_make_money_task_tab,tabLayout,false)
            val tabName = view.findViewById<TextView>(R.id.make_money_tab_tv)
            tabName.text = it
            val tab = tabLayout.newTab()
            tab.customView = view
            tabLayout.addTab(tab)
        }
        tabLayout.getTabAt(0)?.select()
    }

    private fun initTabAndPagerListener(tabLayout: TabLayout, viewPager2: ViewPager2){
        tabLayout.addOnTabSelectedListener(object :TabLayout.OnTabSelectedListener{
            override fun onTabReselected(tab: TabLayout.Tab?) {//再次选中
            }

            override fun onTabUnselected(tab: TabLayout.Tab?) {//没选中
                val view = tab!!.customView
                val titleTv = view!!.findViewById<TextView>(R.id.make_money_tab_tv)
                titleTv.setTextColor(resources.getColor(R.color.color_666666))
            }

            override fun onTabSelected(tab: TabLayout.Tab?) {//选中
                val index = tab!!.position
                val view = tab.customView
                val titleTv = view!!.findViewById<TextView>(R.id.make_money_tab_tv)
                titleTv.setTextColor(resources.getColor(R.color.color_F39825))
                viewPager2.setCurrentItem(index, true)
            }
        })
        viewPager2.registerOnPageChangeCallback(object :ViewPager2.OnPageChangeCallback(){
            override fun onPageSelected(position: Int) {
                super.onPageSelected(position)
                //选择的位置
                tabLayout.getTabAt(position)?.select()
                if(3 == position){
                    make_money_title.setRightTxt("管理")
                }else{
                    make_money_title.setRightTxt("筛选")
                }
            }
        })
    }

}

2、编写PagerAdapter

/**
 * ViewPager适配器
 */
class MakeMoneyPagerAdapter : FragmentStateAdapter {

    var fragments :MutableList<Fragment> = arrayListOf()

    constructor(fragmentActivity :FragmentActivity):super(fragmentActivity)
    constructor(fragment :Fragment):super(fragment)
    constructor(@NonNull fragmentManager : FragmentManager, lifecycle : Lifecycle):super(fragmentManager,lifecycle)

    override fun getItemCount() = fragments.size
    override fun createFragment(position: Int) = fragments[position]

//    override fun getItemId(position: Int): Long = fragments.itemId(position)
//    override fun containsItem(itemId: Long): Boolean = fragments.contains(itemId)
//    }
}

3、编写Fragment页面

package com.wd.daquan.explore.fragment

import android.os.Bundle
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import androidx.recyclerview.widget.LinearLayoutManager
import androidx.recyclerview.widget.RecyclerView
import kotlinx.android.synthetic.main.fragment_make_money_task.*

/**
 * 赚钱中的任务分页
 */
class MakeMoneyTaskFragment :Fragment() {
    override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
        return inflater.inflate(R.layout.fragment_make_money_task,container,false)
    }
}

viewpager2的使用方式：https://github.com/android/views-widgets-samples/tree/master/ViewPager2