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">

    <TextView
        android:layout_width="match_parent"
        android:layout_height="55dp"
        android:background="#4A6BFB"
        android:gravity="center"
        android:text="Custom Tabs"
        android:textColor="#FFFFFF"
        android:textSize="20sp"
        android:textStyle="bold" />

    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="#4A6BFB">

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_margin="20dp"
            android:background="@drawable/round_back_white10_100"
            android:orientation="horizontal"
            android:weightSum="3">

            <TextView
                android:id="@+id/tabItem1"
                android:layout_width="0dp"
                android:layout_height="50dp"
                android:layout_weight="1"
                android:background="@drawable/round_back_white_100"
                android:gravity="center"
                android:text="Tab Item 1"
                android:textColor="#000000"
                android:textStyle="bold" />

            <TextView
                android:id="@+id/tabItem2"
                android:layout_width="0dp"
                android:layout_height="50dp"
                android:layout_weight="1"
                android:gravity="center"
                android:text="Tab Item 2"
                android:textColor="#80FFFFFF" />

            <TextView
                android:id="@+id/tabItem3"
                android:layout_width="0dp"
                android:layout_height="50dp"
                android:layout_weight="1"
                android:gravity="center"
                android:text="Tab Item 3"
                android:textColor="#80FFFFFF" />
        </LinearLayout>
    </RelativeLayout>

    <androidx.fragment.app.FragmentContainerView
        android:id="@+id/fragmentContainer"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

</LinearLayout>

MainActivity.java

package com.learnoset.customtabs;

import android.graphics.Color;
import android.graphics.Typeface;
import android.os.Bundle;
import android.view.View;
import android.view.animation.Animation;
import android.view.animation.TranslateAnimation;
import android.widget.TextView;

import androidx.appcompat.app.AppCompatActivity;

public class MainActivity extends AppCompatActivity {

    private TextView tabItem1, tabItem2, tabItem3;

    // selected tab number. we have 3 tabs so value must be lie between 1 - 3
    // we are setting default value 1. because by default first tab will be selected
    private int selectedTabNumber = 1;

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

        tabItem1 = findViewById(R.id.tabItem1);
        tabItem2 = findViewById(R.id.tabItem2);
        tabItem3 = findViewById(R.id.tabItem3);

        // selecting first fragment by default
        getSupportFragmentManager().beginTransaction()
                .setReorderingAllowed(true)
                .replace(R.id.fragmentContainer, FragmentOne.class, null)
                .commit();

        tabItem1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                selectTab(1);
            }
        });

        tabItem2.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                selectTab(2);
            }
        });

        tabItem3.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                selectTab(3);
            }
        });
    }

    private void selectTab(int tabNumber) {

        TextView selectedTextView;

        TextView nonSelectedTextView1;
        TextView nonSelectedTextView2;
        // if you have more than three tabs then create nonSelectedTextView3.......n

        if (tabNumber == 1) {

            // user has selected first tab so 1st TextView is selected
            selectedTextView = tabItem1;

            // other two textviews are non selected
            nonSelectedTextView1 = tabItem2;
            nonSelectedTextView2 = tabItem3;

            // setting fragment to the fragment container view
            getSupportFragmentManager().beginTransaction()
                    .setReorderingAllowed(true)
                    .replace(R.id.fragmentContainer, FragmentOne.class, null)
                    .commit();

        } else if (tabNumber == 2) {

            // user has selected second tab so 2nd TextView is selected
            selectedTextView = tabItem2;

            // other two textviews are non selected. 1st and 3rd Tab is non selected
            nonSelectedTextView1 = tabItem1;
            nonSelectedTextView2 = tabItem3;

            // setting fragment to the fragment container view
            getSupportFragmentManager().beginTransaction()
                    .setReorderingAllowed(true)
                    .replace(R.id.fragmentContainer, FragmenTwo.class, null)
                    .commit();
        } else {

            // user has selected third tab so 3rd TextView is selected
            selectedTextView = tabItem3;

            // other two textviews are non selected. 1st and 2nd Tab is non selected
            nonSelectedTextView1 = tabItem1;
            nonSelectedTextView2 = tabItem2;

            // setting fragment to the fragment container view
            getSupportFragmentManager().beginTransaction()
                    .setReorderingAllowed(true)
                    .replace(R.id.fragmentContainer, FragmentThree.class, null)
                    .commit();
        }


        float slideTo = (tabNumber - selectedTabNumber) * selectedTextView.getWidth();

        // creating translate animation
        TranslateAnimation translateAnimation = new TranslateAnimation(0, slideTo, 0, 0);
        translateAnimation.setDuration(100);

        // checking for previously selected tab
        if (selectedTabNumber == 1) {
            tabItem1.startAnimation(translateAnimation);
        } else if (selectedTabNumber == 2) {
            tabItem2.startAnimation(translateAnimation);
        } else {
            tabItem3.startAnimation(translateAnimation);
        }

        translateAnimation.setAnimationListener(new Animation.AnimationListener() {
            @Override
            public void onAnimationStart(Animation animation) {

            }

            @Override
            public void onAnimationEnd(Animation animation) {

                // change design of selected tab's TextView
                selectedTextView.setBackgroundResource(R.drawable.round_back_white_100);
                selectedTextView.setTypeface(null, Typeface.BOLD);
                selectedTextView.setTextColor(Color.BLACK);

                // change design of non selected tab's TextViews
                nonSelectedTextView1.setBackgroundColor(getResources().getColor(android.R.color.transparent));
                nonSelectedTextView1.setTextColor(Color.parseColor("#80FFFFFF"));
                nonSelectedTextView1.setTypeface(null, Typeface.NORMAL);

                nonSelectedTextView2.setBackgroundColor(getResources().getColor(android.R.color.transparent));
                nonSelectedTextView2.setTextColor(Color.parseColor("#80FFFFFF"));
                nonSelectedTextView2.setTypeface(null, Typeface.NORMAL);
            }

            @Override
            public void onAnimationRepeat(Animation animation) {

            }
        });

        selectedTabNumber = tabNumber;
    }
}

fragment_one.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"
    tools:context=".FragmentOne">

    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Fragment One"
            android:textColor="#000000"
            android:textSize="18sp"
            android:layout_centerInParent="true"/>
    </RelativeLayout>

</FrameLayout>

FragmentOne.java

package com.learnoset.customtabs;

import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

import androidx.fragment.app.Fragment;

/**
 * A simple {@link Fragment} subclass.
 * Use the {@link FragmentOne#newInstance} factory method to
 * create an instance of this fragment.
 */
public class FragmentOne extends Fragment {

    // TODO: Rename parameter arguments, choose names that match
    // the fragment initialization parameters, e.g. ARG_ITEM_NUMBER
    private static final String ARG_PARAM1 = "param1";
    private static final String ARG_PARAM2 = "param2";

    // TODO: Rename and change types of parameters
    private String mParam1;
    private String mParam2;

    public FragmentOne() {
        // Required empty public constructor
    }

    /**
     * Use this factory method to create a new instance of
     * this fragment using the provided parameters.
     *
     * @param param1 Parameter 1.
     * @param param2 Parameter 2.
     * @return A new instance of fragment FragmentOne.
     */
    // TODO: Rename and change types and number of parameters
    public static FragmentOne newInstance(String param1, String param2) {
        FragmentOne fragment = new FragmentOne();
        Bundle args = new Bundle();
        args.putString(ARG_PARAM1, param1);
        args.putString(ARG_PARAM2, param2);
        fragment.setArguments(args);
        return fragment;
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        if (getArguments() != null) {
            mParam1 = getArguments().getString(ARG_PARAM1);
            mParam2 = getArguments().getString(ARG_PARAM2);
        }
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        return inflater.inflate(R.layout.fragment_one, container, false);
    }
}

fragment_fragmen_two.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"
    tools:context=".FragmenTwo">

    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Fragment Two"
            android:textColor="#000000"
            android:textSize="18sp"
            android:layout_centerInParent="true"/>
    </RelativeLayout>

</FrameLayout>

FragmentTwo.java

package com.learnoset.customtabs;

import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

import androidx.fragment.app.Fragment;

/**
 * A simple {@link Fragment} subclass.
 * Use the {@link FragmenTwo#newInstance} factory method to
 * create an instance of this fragment.
 */
public class FragmenTwo extends Fragment {

    // TODO: Rename parameter arguments, choose names that match
    // the fragment initialization parameters, e.g. ARG_ITEM_NUMBER
    private static final String ARG_PARAM1 = "param1";
    private static final String ARG_PARAM2 = "param2";

    // TODO: Rename and change types of parameters
    private String mParam1;
    private String mParam2;

    public FragmenTwo() {
        // Required empty public constructor
    }

    /**
     * Use this factory method to create a new instance of
     * this fragment using the provided parameters.
     *
     * @param param1 Parameter 1.
     * @param param2 Parameter 2.
     * @return A new instance of fragment FragmenTwo.
     */
    // TODO: Rename and change types and number of parameters
    public static FragmenTwo newInstance(String param1, String param2) {
        FragmenTwo fragment = new FragmenTwo();
        Bundle args = new Bundle();
        args.putString(ARG_PARAM1, param1);
        args.putString(ARG_PARAM2, param2);
        fragment.setArguments(args);
        return fragment;
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        if (getArguments() != null) {
            mParam1 = getArguments().getString(ARG_PARAM1);
            mParam2 = getArguments().getString(ARG_PARAM2);
        }
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        return inflater.inflate(R.layout.fragment_fragmen_two, container, false);
    }
}

fragment_three.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"
    tools:context=".FragmentThree">

    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Fragment Three"
            android:textColor="#000000"
            android:textSize="18sp"
            android:layout_centerInParent="true"/>
    </RelativeLayout>

</FrameLayout>

FragmentThree.java

package com.learnoset.customtabs;

import android.os.Bundle;

import androidx.fragment.app.Fragment;

import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

/**
 * A simple {@link Fragment} subclass.
 * Use the {@link FragmentThree#newInstance} factory method to
 * create an instance of this fragment.
 */
public class FragmentThree extends Fragment {

    // TODO: Rename parameter arguments, choose names that match
    // the fragment initialization parameters, e.g. ARG_ITEM_NUMBER
    private static final String ARG_PARAM1 = "param1";
    private static final String ARG_PARAM2 = "param2";

    // TODO: Rename and change types of parameters
    private String mParam1;
    private String mParam2;

    public FragmentThree() {
        // Required empty public constructor
    }

    /**
     * Use this factory method to create a new instance of
     * this fragment using the provided parameters.
     *
     * @param param1 Parameter 1.
     * @param param2 Parameter 2.
     * @return A new instance of fragment FragmentThree.
     */
    // TODO: Rename and change types and number of parameters
    public static FragmentThree newInstance(String param1, String param2) {
        FragmentThree fragment = new FragmentThree();
        Bundle args = new Bundle();
        args.putString(ARG_PARAM1, param1);
        args.putString(ARG_PARAM2, param2);
        fragment.setArguments(args);
        return fragment;
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        if (getArguments() != null) {
            mParam1 = getArguments().getString(ARG_PARAM1);
            mParam2 = getArguments().getString(ARG_PARAM2);
        }
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        return inflater.inflate(R.layout.fragment_three, container, false);
    }
}

round_back_white10_100.xml

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle">

    <solid android:color="#1AFFFFFF"/>
    <corners android:radius="100dp"/>

</shape>

round_back_white_100.xml

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle">

    <corners android:radius="100dp"/>
    <solid android:color="#FFFFFF"/>
</shape>

Output