Turbolinks Adapter cannot be applied to MainActivity

Question

I'm following the turbolinks-android documentation, https://github.com/turbolinks/turbolinks-android, trying to setup an android wrapper for a Rails site built with turbolinks 5. Come across an issue with this line, .adapter(this) in Main Activity. Below I'll post my MainActivity.java and stack trace. All other code is the same as a previous question I've posted here ( TurbolinksView not being found on Android). Any help is appreciated. Thanks :)

MainActivity.java:

package com.example.turbolinkswrapper;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;

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


public class MainActivity extends AppCompatActivity {

    private TurbolinksView turbolinksView;

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

        // Assumes an instance variable is defined. Find the view you added to your
        // layout in step 1.

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

        TurbolinksSession.getDefault(this)
                .activity(this)
                .adapter(this)
                .view(turbolinksView)
                .visit("https://basecamp.com");
    }
}

stack trace:

E/AndroidRuntime: FATAL EXCEPTION: main
                  Process: com.example.turbolinkswrapper, PID: 5540
                  java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.turbolinkswrapper/com.example.turbolinkswrapper.MainActivity}: java.lang.ClassCastException: com.example.turbolinkswrapper.MainActivity cannot be cast to com.basecamp.turbolinks.TurbolinksAdapter
                      at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2665)
                      at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2726)
                      at android.app.ActivityThread.-wrap12(ActivityThread.java)
                      at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1477)
                      at android.os.Handler.dispatchMessage(Handler.java:102)
                      at android.os.Looper.loop(Looper.java:154)
                      at android.app.ActivityThread.main(ActivityThread.java:6119)
                      at java.lang.reflect.Method.invoke(Native Method)
                      at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886)
                      at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776)
                   Caused by: java.lang.ClassCastException: com.example.turbolinkswrapper.MainActivity cannot be cast to com.basecamp.turbolinks.TurbolinksAdapter
                      at com.example.turbolinkswrapper.MainActivity.onCreate(MainActivity.java:26)
                      at android.app.Activity.performCreate(Activity.java:6679)
                      at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1118)
                      at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2618)
                      at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2726) 
                      at android.app.ActivityThread.-wrap12(ActivityThread.java) 
                      at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1477) 
                      at android.os.Handler.dispatchMessage(Handler.java:102) 
                      at android.os.Looper.loop(Looper.java:154) 
                      at android.app.ActivityThread.main(ActivityThread.java:6119) 
                      at java.lang.reflect.Method.invoke(Native Method) 
                      at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886) 
                      at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776) 
Application terminated.

Answer 1

According to step two you need to implement the TurboLinksAdapter Interface:

package com.example.turbolinkswrapper;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;

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


public class MainActivity extends AppCompatActivity implements TurbolinksAdapter

    private TurbolinksView turbolinksView;

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

        // Assumes an instance variable is defined. Find the view you added to your
        // layout in step 1.

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

        TurbolinksSession.getDefault(this)
                .activity(this)
                .adapter(this)
                .view(turbolinksView)
                .visit("https://basecamp.com");
    }

    @Override
    public void onPageFinished() {

    }

    @Override
    public void onReceivedError(int errorCode) {

    }

    @Override
    public void pageInvalidated() {

    }

    @Override
    public void requestFailedWithStatusCode(int statusCode) {

    }

    @Override
    public void visitCompleted() {

    }

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