package org.ruby_china.rubychina;

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.Toolbar;
import android.webkit.WebSettings;

import com.basecamp.turbolinks.TurbolinksAdapter;
import com.basecamp.turbolinks.TurbolinksSession;
import com.basecamp.turbolinks.TurbolinksView;

public class MainActivity extends AppCompatActivity implements TurbolinksAdapter {

    private static final String BASE_URL = "https://ruby-china.org";
    private static final String INTENT_URL = "intentUrl";

    private String location;
    private TurbolinksView turbolinksView;

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

        Toolbar myToolbar = (Toolbar) findViewById(R.id.main_toolbar);
        setSupportActionBar(myToolbar);

        turbolinksView = (TurbolinksView) findViewById(R.id.turbolinks_view);

        TurbolinksSession.getDefault(this).setDebugLoggingEnabled(true);

        WebSettings webSettings = TurbolinksSession.getDefault(this).getWebView().getSettings();
        webSettings.setUserAgentString("turbolinks-app, ruby-china, official, android");

        location = getIntent().getStringExtra(INTENT_URL) != null ? getIntent().getStringExtra(INTENT_URL) : BASE_URL;

        TurbolinksSession.getDefault(this)
                         .activity(this)
                         .adapter(this)
                         .view(turbolinksView)
                         .visit(location);
    }

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

        TurbolinksSession.getDefault(this)
                .activity(this)
                .adapter(this)
                .restoreWithCachedSnapshot(true)
                .view(turbolinksView)
                .visit(location);
    }

    @Override
    public void onPageFinished() {

    }

    @Override
    public void visitProposedToLocationWithAction(String location, String action) {
        Intent intent = new Intent(this, MainActivity.class);
        intent.putExtra(INTENT_URL, location);

        this.startActivity(intent);
    }

    @Override
    public void onReceivedError(int errorCode) {

    }

    @Override
    public void pageInvalidated() {

    }

    @Override
    public void requestFailedWithStatusCode(int statusCode) {

    }

    @Override
    public void visitCompleted() {

    }
}

package org.ruby_china.rubychina;

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.Toolbar;
import android.webkit.WebSettings;

import com.basecamp.turbolinks.TurbolinksAdapter;
import com.basecamp.turbolinks.TurbolinksSession;
import com.basecamp.turbolinks.TurbolinksView;

public class MainActivity extends AppCompatActivity implements TurbolinksAdapter {

    private static final String BASE_URL = "https://ruby-china.org/topics";
    private static final String INTENT_URL = "intentUrl";

    private String location;
    private TurbolinksView turbolinksView;

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

        Toolbar myToolbar = (Toolbar) findViewById(R.id.main_toolbar);
        setSupportActionBar(myToolbar);

        turbolinksView = (TurbolinksView) findViewById(R.id.turbolinks_view);

        TurbolinksSession.getDefault(this).setDebugLoggingEnabled(true);

        WebSettings webSettings = TurbolinksSession.getDefault(this).getWebView().getSettings();
        webSettings.setUserAgentString("turbolinks-app, ruby-china, official, android");

        location = getIntent().getStringExtra(INTENT_URL) != null ? getIntent().getStringExtra(INTENT_URL) : BASE_URL;

        TurbolinksSession.getDefault(this)
                         .activity(this)
                         .adapter(this)
                         .view(turbolinksView)
                         .visit(location);
    }

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

        TurbolinksSession.getDefault(this)
                .activity(this)
                .adapter(this)
                .restoreWithCachedSnapshot(true)
                .view(turbolinksView)
                .visit(location);
    }

    @Override
    public void onPageFinished() {

    }

    @Override
    public void visitProposedToLocationWithAction(String location, String action) {
        Intent intent = new Intent(this, MainActivity.class);
        intent.putExtra(INTENT_URL, location);

        this.startActivity(intent);
    }

    @Override
    public void onReceivedError(int errorCode) {

    }

    @Override
    public void pageInvalidated() {

    }

    @Override
    public void requestFailedWithStatusCode(int statusCode) {

    }

    @Override
    public void visitCompleted() {

    }
}

Set default path to /topics