Using Turbolinks Android with tabs.

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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">

    <FrameLayout
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginBottom="55dp">
      
        <com.basecamp.turbolinks.TurbolinksView
            android:id="@+id/tab1_turbolinks_view"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_gravity="center" />
        <com.basecamp.turbolinks.TurbolinksView
            android:id="@+id/tab2_turbolinks_view"
            android:layout_width="match_parent"
            android:layout_height="match_parent"/>
      
    </FrameLayout>

    <com.google.android.material.bottomnavigation.BottomNavigationView
        android:id="@+id/bottomNavigation"
        android:layout_width="match_parent"
        android:layout_height="55dp"
        android:background="@color/bottomNavigationBackground"
        app:itemIconTint="@color/bottomNavigationItem"
        app:itemTextColor="@color/bottomNavigationItem"
        android:layout_gravity="bottom"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:menu="@menu/bottom_navigation"
        app:labelVisibilityMode="unlabeled"/>

</androidx.constraintlayout.widget.ConstraintLayout>

MainActivity.java

public class MainActivity extends AppCompatActivity implements TurbolinksAdapter {
    // Change the BASE_URL to an address that your VM or device can hit.
    private static final String BASE_URL = "http://10.0.1.100:9292";
    private static final String INTENT_URL = "intentUrl";

    String tab1_path = "/tab1";
    String tab2_path = "/tab2";
  
    boolean tab1_is_visited = false;
    boolean tab2_is_visited = false;
  
    String selectedTab = "";
  
    TurbolinksView tab1TurbolinksView;
    TurbolinksView tab2TurbolinksView;
  
    TurbolinksSession tab1TurbolinksSession;
    TurbolinksSession tab2TurbolinksSession;
  
    BottomNavigationView bottomNavigationView; // Can be anything. I just used this.

    // -----------------------------------------------------------------------
    // Activity overrides
    // -----------------------------------------------------------------------

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

        // Find the custom TurbolinksView objects in layout.
        tab1TurbolinksView = (TurbolinksView) findViewById(R.id.tab1_turbolinks_view);
        tab2TurbolinksView = (TurbolinksView) findViewById(R.id.tab2_turbolinks_view);
      
        // Create new TurbolinksSessions
        tab1TurbolinksSession = TurbolinksSession.getNew(this);
        tab2TurbolinksSession = TurbolinksSession.getNew(this);

        // For this demo app, we force debug logging on. You will only want to do
        // this for debug builds of your app (it is off by default)
        TurbolinksSession.getDefault(this).setDebugLoggingEnabled(true);
      
        // Dispatch a OnNavigationItemSelectedListener to bottomNavigationView for handling tab changes.
        bottomNavigationView = (BottomNavigationView) findViewById(R.id.bottomNavigation);
        bottomNavigationView.setOnNavigationItemSelectedListener(new BottomNavigationView.OnNavigationItemSelectedListener() {
            @Override
            public boolean onNavigationItemSelected(@NonNull MenuItem menuItem) {
                switch (menuItem.getItemId()) {
                    case R.id.tab1:
                        changeView("Tab1");
                        break;
                    case R.id.tab2 :
                        changeView("Tab2");
                        break;
                }
                return true;
            }
        });
      
        // Execute the visit for tab1 page.
        visitTab1(false);
        tab1_is_visited = true;
      
        // Hide other webviews for preventing conflict.
        tab2TurbolinksView.setVisibility(View.GONE);
    }

    @Override
    protected void onRestart() {
        super.onRestart();

        // Revisit active tabs webview.
        if(selectedTab.equals("Tab1")) {
            visitTab1(true);
        } else if(selectedTab.equals("Tab2")) {
            visitTab2(true);
        }
    }
  
    // -----------------------------------------------------------------------
    // Private custom visit methods
    // -----------------------------------------------------------------------

    private void visitTab1(Boolean restoreWithCachedSnapshot) {
        tab1TurbolinksSession
                .activity(this)
                .adapter(this)
                .restoreWithCachedSnapshot(restoreWithCachedSnapshot)
                .view(tab1TurbolinksView)
                .visit(BASE_URL + tab1_path);
    }
  
    private void visitTab2(Boolean restoreWithCachedSnapshot) {
        tab2TurbolinksSession
                .activity(this)
                .adapter(this)
                .restoreWithCachedSnapshot(restoreWithCachedSnapshot)
                .view(tab2TurbolinksView)
                .visit(BASE_URL + tab2_path);
    }

    @Override
    public void visitProposedToLocationWithAction(String location, String action) {
        // RegularActivity is a non-tabbed turbolinks activity for preventing possible errors.
        Intent intent = new Intent(this, RegularActivity.class);
        intent.putExtra(INTENT_URL, location);

        this.startActivity(intent);
    }
  
    // -----------------------------------------------------------------------
    // Private methods
    // -----------------------------------------------------------------------

   private void changeView(String name) {
        if(name.equals("Tab1")) {
            if(!tab1_is_visited) {
                visitTab1(true);
                tab1_is_visited = true;
            }
            tab1TurbolinksView.setVisibility(View.VISIBLE);
            tab2TurbolinksView.setVisibility(View.GONE);
        } else if(name.equals("Tab2")) {
            if(!tab2_is_visited) {
                visitTab2(true);
                tab2_is_visited = true;
            }
            tab1TurbolinksView.setVisibility(View.GONE);
            tab2TurbolinksView.setVisibility(View.VISIBLE);
        }
        selectedTab = name;
    }
    
}