[Kotlin] CoordinatorLayout + ViewPager2 + TabLayout

CoordinatorLayout  +  ViewPager2  +  TabLayout

---

build.gradle (Module: app)

dependencies {
    // material design
    implementation 'com.google.android.material:material:1.1.0'
    // ViewPager2
    implementation 'androidx.viewpager2:viewpager2:1.0.0'
    // RecyclerView
    implementation 'androidx.recyclerview:recyclerview:1.1.0'
}

 

 

 

 

 

 

styles.xml

<resources>
    <!-- Base application theme. -->
    <style name="AppTheme" parent="Theme.MaterialComponents.Light.NoActionBar">
        <!-- Customize your theme here. -->
        <item name="colorPrimary">@color/colorPrimary</item>
        <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
        <item name="colorAccent">@color/colorAccent</item>
    </style>

</resources>

 

 

 

 

 

 

recyclerview_item.xml

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

    <TextView
        android:id="@+id/tvName"
        android:hint="James Kim"
        android:textSize="20dp"
        android:gravity="center"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

</LinearLayout>

recyclerview_item.xml

 

 

 

 

 

RecyclerViewAdapter.kt

package com.jwsoft.kotlinproject

import android.content.Context
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.TextView
import androidx.recyclerview.widget.RecyclerView

class RecyclerViewAdapter(var dataSet: List<Int>) : RecyclerView.Adapter<RecyclerViewAdapter.MyViewHolder>() {

    inner class MyViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView) {
        var tvName: TextView = itemView.findViewById(R.id.tvName)

        fun bind(position: Int) {
            tvName.text = "혀가 길지 않은 개발자 ${position + 1}"
        }
    }

    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): MyViewHolder {
        val context = parent.context
        val inflater = context.getSystemService(Context.LAYOUT_INFLATER_SERVICE) as LayoutInflater
        val view = inflater.inflate(R.layout.recyclerview_item, parent, false)

        return MyViewHolder(view)
    }

    override fun getItemCount(): Int {
        return dataSet.size
    }

    override fun onBindViewHolder(holder: MyViewHolder, position: Int) {
        holder.bind(position)
    }

}

 

 

 

 

 

 

viewpager_fragment.xml

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout
    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">

    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/rvName"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:gravity="center"
        tools:listitem="@layout/recyclerview_item" />

</FrameLayout>

viewpager_fragment.xml

 

 

 

 

 

ViewPagerFragmentRed.kt

package com.jwsoft.kotlinproject

import android.graphics.Color
import android.os.Bundle
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import androidx.fragment.app.Fragment
import androidx.recyclerview.widget.LinearLayoutManager
import androidx.recyclerview.widget.RecyclerView

class ViewPagerFragmentRed : Fragment() {

    private lateinit var recyclerView: RecyclerView

    override fun onCreateView(
        inflater: LayoutInflater,
        container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View? {
        return inflater.inflate(R.layout.viewpager_fragment, container, false)
    }

    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        super.onViewCreated(view, savedInstanceState)

        view.setBackgroundColor(Color.parseColor("#FFBBBB"))

        recyclerView = view.findViewById(R.id.rvName)

        var dataSet: List<Int> = (1..100).toList()
        recyclerView.adapter = RecyclerViewAdapter(dataSet)
        recyclerView.layoutManager = LinearLayoutManager(view.context, RecyclerView.VERTICAL, false)

    }

}

 

 

 

 

 

 

 

ViewPagerFragmentGreen.kt

package com.jwsoft.kotlinproject

import android.graphics.Color
import android.os.Bundle
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import androidx.fragment.app.Fragment
import androidx.recyclerview.widget.LinearLayoutManager
import androidx.recyclerview.widget.RecyclerView

class ViewPagerFragmentGreen : Fragment() {

    private lateinit var recyclerView: RecyclerView

    override fun onCreateView(
        inflater: LayoutInflater,
        container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View? {
        return inflater.inflate(R.layout.viewpager_fragment, container, false)
    }

    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        super.onViewCreated(view, savedInstanceState)

        view.setBackgroundColor(Color.parseColor("#BBFFBB"))

        recyclerView = view.findViewById(R.id.rvName)

        var dataSet: List<Int> = (1..100).toList()
        recyclerView.adapter = RecyclerViewAdapter(dataSet)
        recyclerView.layoutManager = LinearLayoutManager(view.context, RecyclerView.VERTICAL, false)

    }

}

 

 

 

 

 

 

 

ViewPagerFragmentBlue.kt

package com.jwsoft.kotlinproject

import android.graphics.Color
import android.os.Bundle
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import androidx.fragment.app.Fragment
import androidx.recyclerview.widget.LinearLayoutManager
import androidx.recyclerview.widget.RecyclerView

class ViewPagerFragmentBlue : Fragment() {

    private lateinit var recyclerView: RecyclerView

    override fun onCreateView(
        inflater: LayoutInflater,
        container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View? {
        return inflater.inflate(R.layout.viewpager_fragment, container, false)
    }

    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        super.onViewCreated(view, savedInstanceState)

        view.setBackgroundColor(Color.parseColor("#BBBBFF"))

        recyclerView = view.findViewById(R.id.rvName)

        var dataSet: List<Int> = (1..100).toList()
        recyclerView.adapter = RecyclerViewAdapter(dataSet)
        recyclerView.layoutManager = LinearLayoutManager(view.context, RecyclerView.VERTICAL, false)

    }

}

 

 

 

 

 

 

 

ViewPagerFragmentAdapter.kt

package com.jwsoft.kotlinproject

import androidx.fragment.app.Fragment
import androidx.fragment.app.FragmentActivity
import androidx.viewpager2.adapter.FragmentStateAdapter

class ViewPagerFragmentAdapter(fragmentActivity: FragmentActivity) : FragmentStateAdapter(fragmentActivity) {

    private val TYPE_RED = 0
    private val TYPE_GREEN = 1
    private val TYPE_BLUE = 2

    private var listPager: List<Int> = listOf(TYPE_RED, TYPE_GREEN, TYPE_BLUE)

    override fun getItemCount(): Int {
        return listPager.size
    }

    override fun createFragment(position: Int): Fragment {
        return when (position) {
            TYPE_RED -> ViewPagerFragmentRed()
            TYPE_GREEN -> ViewPagerFragmentGreen()
            else -> ViewPagerFragmentBlue()
        }
    }
}

 

 

 

 

 

 

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<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:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <androidx.coordinatorlayout.widget.CoordinatorLayout
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1">

        <com.google.android.material.appbar.AppBarLayout
            android:id="@+id/appBarLayout"
            android:layout_width="match_parent"
            android:layout_height="wrap_content">

            <androidx.appcompat.widget.Toolbar
                android:id="@+id/toolBar"
                app:title="혀가 길지 않은 개발자"
                app:titleTextColor="@android:color/white"
                app:subtitle="CoordinatorLayout  +  ViewPager2  +  TabLayout"
                app:subtitleTextColor="@android:color/white"
                app:layout_scrollFlags="scroll|enterAlways"
                android:background="#FF7F00"
                android:layout_width="match_parent"
                android:layout_height="?android:attr/actionBarSize" />

        </com.google.android.material.appbar.AppBarLayout>

        <androidx.viewpager2.widget.ViewPager2
            android:id="@+id/viewPager2"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            app:layout_behavior="@string/appbar_scrolling_view_behavior" />

    </androidx.coordinatorlayout.widget.CoordinatorLayout>

    <com.google.android.material.tabs.TabLayout
        android:id="@+id/tabLayout"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

</LinearLayout>

activity_main.xml

 

 

 

 

 

MainActivity.kt

package com.jwsoft.kotlinproject

import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import androidx.viewpager2.widget.ViewPager2
import com.google.android.material.appbar.AppBarLayout
import com.google.android.material.tabs.TabLayout
import com.google.android.material.tabs.TabLayoutMediator
import kotlinx.android.synthetic.main.activity_main.*

class MainActivity : AppCompatActivity() {

    private lateinit var viewPager2: ViewPager2
    private lateinit var tabLayout: TabLayout
    private lateinit var appBarLayout: AppBarLayout

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

        tabLayout = findViewById(R.id.tabLayout)
        appBarLayout = findViewById(R.id.appBarLayout)
        viewPager2 = findViewById(R.id.viewPager2)

        viewPager2.adapter = ViewPagerFragmentAdapter(this)
        viewPager2.orientation = ViewPager2.ORIENTATION_HORIZONTAL

        TabLayoutMediator(tabLayout, viewPager2) { tab, position ->  
            when (position) {
                0 -> tab.text = "RED"
                1 -> tab.text = "GREEN"
                else -> tab.text = "BLUE"
            }
        }.attach()

        viewPager2.registerOnPageChangeCallback(object: ViewPager2.OnPageChangeCallback() {
            override fun onPageSelected(position: Int) {
                super.onPageSelected(position)
                appBarLayout.setExpanded(true)
            }
        })
    }

}

실행 결과