Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

Android Build a Weather App (2015) Concurrency and Error Handling Executing an Asynchronous Call

Posted by Tatenda Goteka
Tatenda Goteka
2,046 Points

building weather

Challenge Task 1 of 2

Continuing with our movie app, we are now ready to asynchronously execute the request we previously built. Start by creating a Call variable and set it using the newCall() method from the OkHttpClient. Hint: newCall() requires a parameter of the Request type.

Bummer! There is a compiler error. Please click on preview to view your syntax errors!

MovieActivity.java

import android.app.Activity;

import android.os.Bundle;

import android.view.View;

import android.widget.Button;

import java.io.IOException;

​

public class MovieActivity extends Activity {

@Override

public void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);

    setContentView(R.layout.activity_movie);

​

         Call call = Call();

​

    // Get some movie information!

    String apiUrl = "http://api.rottentomatoes.com/api/public/v1.0/movies.json?apikey=xyz&q=hobbit";

    OkHttpClient client = new OkHttpClient();

    Request request = new Request.Builder()

            .url(apiUrl)

            .build();

}

​

}

​

​

MovieActivity.java 
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import java.io.IOException;

public class MovieActivity extends Activity {

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_movie);

             Call call = Call(); 

        // Get some movie information!
        String apiUrl = "http://api.rottentomatoes.com/api/public/v1.0/movies.json?apikey=xyz&q=hobbit";
        OkHttpClient client = new OkHttpClient();
        Request request = new Request.Builder()
                .url(apiUrl)
                .build();
    }

}

3 Answers

lloyso
lloyso
14,141 Points
lloyso
lloyso
14,141 Points

/The answer for ex1:/ public class MovieActivity extends Activity {

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_movie);

    // Get some movie information!
    String apiUrl = "http://api.rottentomatoes.com/api/public/v1.0/movies.json?apikey=xyz&q=hobbit";
    OkHttpClient client = new OkHttpClient();
    Request request = new Request.Builder()
            .url(apiUrl)
            .build();
  Call call = client.newCall(request);
}

}

lloyso
lloyso
14,141 Points
lloyso
lloyso
14,141 Points

/for ex2/ public class MovieActivity extends Activity {

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_movie);

    // Get some movie information!
    String apiUrl = "http://api.rottentomatoes.com/api/public/v1.0/movies.json?apikey=xyz&q=hobbit";
    OkHttpClient client = new OkHttpClient();
    Request request = new Request.Builder()
            .url(apiUrl)
            .build();
  Call call = client.newCall(request);

  call.enqueue(new Callback() {
    @Override
    public void onFailure(Request request, IOException e) { }

    @Override
    public void OnResponse(Response response) throws IOException { }
});

}

}

lloyso
lloyso
14,141 Points
lloyso
lloyso
14,141 Points

on part2 change OnResponse to onResponse