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Android Build an Interactive Story App The Rest of the Story Navigation

Binyamin Friedman
Binyamin Friedman
14,615 Points
Posted by Binyamin Friedman
Binyamin Friedman
14,615 Points

Why doesn't this work? 

./PodcastActivity.java:13: error: cannot find symbol
             Toast.makeText(getApplicationContext(), "You pressed the back button!", Toast.LENGTH_SHORT).show();
                            ^
  symbol:   method getApplicationContext()
  location: class PodcastActivity
1 error
PodcastActivity.java 
import android.os.Bundle;

public class PodcastActivity extends AppCompatActivity {

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

    @Override
    public void onBackPressed() {
       Toast.makeText(getApplicationContext(), "You pressed the back button!", Toast.LENGTH_SHORT).show();
       super.onBackPressed();
    }
}

1 Answer

Tarek M.Tolba
Tarek M.Tolba
Courses Plus Student 3,613 Points

Nothing wrong with your code, otherwise they are expecting "this" instead of getApplicationContext()

     Toast.makeText(this, "You pressed the back button!", Toast.LENGTH_SHORT).show();
       super.onBackPressed();
Binyamin Friedman
Binyamin Friedman
14,615 Points
Binyamin Friedman
Binyamin Friedman
14,615 Points

Thank you! Why does getApplicationContext() not work? Is it because in the code challenge they don't have certain methods?

Tarek M.Tolba
Tarek M.Tolba
Courses Plus Student 3,613 Points

Yup, it has something to do with the code challenge.

Seth Kroger
Seth Kroger
56,414 Points
Seth Kroger
Seth Kroger
56,414 Points

The challenges aren't tested with the actual Android OS. That would take too many resources. Instead they are tested with mock versions of classes like Activity and Toast that have limited responses that are only those useful for the challenge.

The Android testing course covers the topic of mocking, since it's important to writing automated tests.