TabLayout代替Radio

MainActivity

import android.os.Bundle;
import android.support.design.widget.TabLayout;
import android.support.v4.app.Fragment;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;

import com.example.week2_moni.adapter.MyAdapter;
import com.example.week2_moni.fragment.Afragment;
import com.example.week2_moni.fragment.Bfragment;

import java.util.ArrayList;

public class MainActivity extends AppCompatActivity {
    private TabLayout Tab_Layout;
    private ViewPager View_Pager;
    private ArrayList<Fragment> mList = new ArrayList<>();
    private ArrayList<String> mTitle = new ArrayList<>();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initData();
        initView();

    }

    private void initData() {
        mList.add(new Afragment());
        mList.add(new Bfragment());
        mTitle.add("首頁");
        mTitle.add("新聞");
    }

    private void initView() {
        Tab_Layout = findViewById(R.id.Tab_Layout);
        View_Pager = findViewById(R.id.View_Pager);
        View_Pager.setAdapter(new MyAdapter(getSupportFragmentManager(), mList, mTitle));
        Tab_Layout.setupWithViewPager(View_Pager);
    }
}

適配器MyAdapter

import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import java.util.ArrayList;
public class MyAdapter extends FragmentPagerAdapter {
    private ArrayList<Fragment> mList;
    private ArrayList<String> mTitle;
  public MyAdapter(FragmentManager fm, ArrayList<Fragment> mList, ArrayList<String> mTitle) {
        super(fm);
        this.mList = mList;
        this.mTitle = mTitle;
    }
 @Override
    public Fragment getItem(int i) {
        return mList.get(i);
    }
 @Override
    public int getCount() {
        return mList.size();
    }
    @Nullable
    @Override
    public CharSequence getPageTitle(int position) {
        return mTitle.get(position);
    }
}

主佈局

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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">
    <!--tabMode默認是fixed 自適應-->
<android.support.design.widget.TabLayout
    android:id="@+id/Tab_Layout"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    app:tabMode="scrollable"/>
<android.support.v4.view.ViewPager
    android:id="@+id/View_Pager"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_below="@+id/Tab_Layout">
</android.support.v4.view.ViewPager>
</RelativeLayout>

構造n個Fragment 切換