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簡単にTabLayoutとViewPagerを組み合わせる方法について

f:id:moshimore:20181009095645p:plain
簡単にTabLayoutとViewPagerを組み合わせる方法についてです。

完成イメージ

f:id:moshimore:20181009101147p:plainf:id:moshimore:20181009101150p:plainf:id:moshimore:20181009101547p:plain

ソースコード

Main1Fragment.javaとMain1Fragment.java、fragment_main1.xmlとfragment_main2.xmlは、それぞれ同じ内容です。

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 Main1Fragment();
                    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);
    }
}

activity_main.xml

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

    <android.support.design.widget.TabLayout
        android:id="@+id/tabLayout"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

    <android.support.v4.view.ViewPager
        android:id="@+id/viewPager"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

</LinearLayout>

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>

build.gradle

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

以上、簡単にTabLayoutとViewPagerを組み合わせる方法についてでした。