簡単にToolbarがスクロールするTabLayoutを実装する方法について

f:id:moshimore:20181009095645p:plain
TabLayoutとViewPagerを組み合わせを発展させてToolbar部分をスクロールさせます。

Toolbarをスクロールさせる必要がない場合は、以下のエントリーになります。
knowledge.moshimore.jp

完成イメージ

f:id:moshimore:20181010073205p:plainf:id:moshimore:20181010073209p:plainf:id:moshimore:20181010073212p:plain

ソースコード

MainActivity.java

import android.support.design.widget.TabLayout;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
public class MainActivity extends AppCompatActivity
{
private CharSequence[] tabTitle = {"タブ1", "タブ2", "タブ3"};
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
FragmentPagerAdapter adapter = new FragmentPagerAdapter(getSupportFragmentManager())
{
@Override
public Fragment getItem(int position)
{
switch (position)
{
case 0:
return new Main1Fragment();
case 1:
return new Main2Fragment();
case 2:
return new Main3Fragment();
                    default:
return null;
}
}
@Override
public CharSequence getPageTitle(int position)
{
return tabTitle[position];
}
@Override
public int getCount()
{
return tabTitle.length;
}
};
ViewPager viewPager = findViewById(R.id.viewPager);
viewPager.setOffscreenPageLimit(tabTitle.length);
viewPager.setAdapter(adapter);
TabLayout tabLayout = findViewById(R.id.tabLayout);
tabLayout.setupWithViewPager(viewPager);
}
}

Main1Fragment.java

import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
public class Main1Fragment extends Fragment
{
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState)
{
return inflater.inflate(R.layout.fragment_main1, container, false);
}
@Override
public void onViewCreated(View view, @Nullable Bundle savedInstanceState)
{
super.onViewCreated(view, savedInstanceState);
}
}

Main2Fragment.java

import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
public class Main2Fragment extends Fragment
{
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState)
{
return inflater.inflate(R.layout.fragment_main2, container, false);
}
@Override
public void onViewCreated(View view, @Nullable Bundle savedInstanceState)
{
super.onViewCreated(view, savedInstanceState);
}
}

Main3Fragment.java

import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import java.util.ArrayList;
import java.util.List;
public class Main3Fragment extends Fragment
{
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState)
{
return inflater.inflate(R.layout.fragment_main3, container, false);
}
@Override
public void onViewCreated(View view, @Nullable Bundle savedInstanceState)
{
super.onViewCreated(view, savedInstanceState);
RecyclerView recyclerView = view.findViewById(R.id.recyclerView);
recyclerView.setLayoutManager(new LinearLayoutManager(this.getContext(), LinearLayoutManager.VERTICAL, false));
recyclerView.setAdapter(new RecyclerAdapter(this.getContext(), createData()));
}
private List<String> createData()
{
List<String> data = new ArrayList<>();
for (int index = 0; index < 50; index++) data.add(String.valueOf(index));
return data;
}
}

RecyclerAdapter.java

import android.content.Context;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import java.util.List;
public class RecyclerAdapter extends RecyclerView.Adapter<RecyclerAdapter.ViewHolder>
{
private List<String> data;
private LayoutInflater inflater;
RecyclerAdapter(Context context, List<String> data)
{
this.data = data;
inflater = LayoutInflater.from(context);
}
@Override
public ViewHolder onCreateViewHolder(ViewGroup viewGroup, int i)
{
return new ViewHolder(inflater.inflate(R.layout.list_item, viewGroup, false));
}
@Override
public void onBindViewHolder(ViewHolder viewHolder, int i)
{
viewHolder.textView.setText(data.get(i));
}
@Override
public int getItemCount()
{
return data.size();
}
static class ViewHolder extends RecyclerView.ViewHolder
{
final TextView textView;
ViewHolder(View view)
{
super(view);
textView = view.findViewById(R.id.text);
}
}
}

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout
    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"
    tools:context=".MainActivity">
<android.support.design.widget.AppBarLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar" >
<android.support.v7.widget.Toolbar
            android:id="@+id/toolbar"
            android:layout_width="match_parent"
            android:layout_height="?attr/actionBarSize"
            android:background="?attr/colorPrimary"
            app:layout_scrollFlags="scroll|enterAlways"
            app:title="CoordinatorLayoutTabLayoutViewPager" />
<android.support.design.widget.TabLayout
            android:id="@+id/tabLayout"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:background="?attr/colorPrimary"
            />
</android.support.design.widget.AppBarLayout>
<android.support.v4.view.ViewPager
        android:id="@+id/viewPager"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:layout_behavior="@string/appbar_scrolling_view_behavior"
        />
</android.support.design.widget.CoordinatorLayout>

fragment_main1.xml

<LinearLayout
    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"
    android:orientation="vertical"
    tools:context=".Main1Fragment">
<TextView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:text="fragment1" />
</LinearLayout>

fragment_main2.xml

<LinearLayout
    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"
    android:orientation="vertical"
    tools:context=".Main2Fragment">
<TextView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:text="fragment2" />
</LinearLayout>

fragment_main3.xml

<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".Main3Fragment">
<TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="fragment3" />
<android.support.v7.widget.RecyclerView
        android:id="@+id/recyclerView"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:clipToPadding="false"
        android:fillViewport="true"
        app:layout_behavior="@string/appbar_scrolling_view_behavior" />
</LinearLayout>

list_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"
    android:orientation="vertical">
<TextView
        android:id="@+id/text"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />
</LinearLayout>

styles.xml

<resources>
<!-- Base application theme. -->
<style name="AppTheme" parent="Theme.AppCompat.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>

build.gradle

dependencies
{
// 以下を追加
implementation 'com.android.support:design:27.1.1'
}

TabLayoutもスクロールする方法

「app:layout_scrollFlags=”scroll|enterAlways”」をTabLayoutに追記するとスクロールできます。

以上、簡単にToolbarがスクロールするTabLayoutを実装する方法についてでした。

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