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 an Interactive Story App (Retired) Finishing the User Interface Using a Model in the Controller

Harshvardhan Mairh
Harshvardhan Mairh
2,083 Points
Posted by Harshvardhan Mairh
Harshvardhan Mairh
2,083 Points

Cannot solve code challenge

having trouble solving this challenge

LandingActivity.java 
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;

public class LandingActivity extends Activity {

    public Button mThrustButton;
    public TextView mTypeLabel;
    public EditText mPassengersField;

    public Spaceship mSpaceship;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_landing);
      mSpaceship = new Spaceship();

        mThrustButton = (Button)findViewById(R.id.thrustButton);
        mTypeLabel = (TextView)findViewById(R.id.typeTextView);
        mPassengersField = (EditText)findViewById(R.id.passengersEditText);

        // Add your code here!
    }
}
Spaceship.java 
public class Spaceship {
    private String mType;
    private int mNumPassengers = 0;

    public String getType() {
      return mType;
    }

    public void setType(String type) {
      mType = type;
    }

    public int getNumPassengers() {
      return mNumPassengers;
    }

    public void setNumPassengers(int numPassengers) {
      mNumPassengers = numPassengers;
    }

    public Spaceship() {
      mType = "SHUTTLE";
    }

    public Spaceship(String type) {
      mType = type;
    }
}

1 Answer

Philip Gales
Philip Gales
15,193 Points

Step 1. They wanted you to "Use the custom constructor that takes a String parameter, and pass in "FIREFLY" as the parameter." If you have not used java before, I recommend you read up on constructors or run through the java basics as everything you do in android is java.

public class LandingActivity extends Activity {

    public Button mThrustButton;
    public TextView mTypeLabel;
    public EditText mPassengersField;

    public Spaceship mSpaceship;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_landing);
      mSpaceship = new Spaceship("FIREFLY"); //Added the code here <---------------------------

        mThrustButton = (Button)findViewById(R.id.thrustButton);
        mTypeLabel = (TextView)findViewById(R.id.typeTextView);
        mPassengersField = (EditText)findViewById(R.id.passengersEditText);

        // Add your code here!
    }
}

Step 2. Update the TextView using the getter method

public class LandingActivity extends Activity {

    public Button mThrustButton;
    public TextView mTypeLabel;
    public EditText mPassengersField;

    public Spaceship mSpaceship;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_landing);
      mSpaceship = new Spaceship("FIREFLY");

        mThrustButton = (Button)findViewById(R.id.thrustButton);
        mTypeLabel = (TextView)findViewById(R.id.typeTextView);
        mPassengersField = (EditText)findViewById(R.id.passengersEditText);

        // Add your code here!
mTypeLabel.setText(mSpaceship.getType());//Added code here <----------------------
    }
}

Step 3. Finally, use the setText method found within Spaceship

public class LandingActivity extends Activity {

    public Button mThrustButton;
    public TextView mTypeLabel;
    public EditText mPassengersField;

    public Spaceship mSpaceship;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_landing);
      mSpaceship = new Spaceship("FIREFLY");

        mThrustButton = (Button)findViewById(R.id.thrustButton);
        mTypeLabel = (TextView)findViewById(R.id.typeTextView);
      mTypeLabel.setText(mSpaceship.getType());
        mPassengersField = (EditText)findViewById(R.id.passengersEditText);

        // Add your code here!
mTypeLabel.setText(mSpaceship.getType());
mPassengersField.setText(mSpaceship.getNumPassengers() + ""); //Added code here <----------------------
    }
}
Harshvardhan Mairh
Harshvardhan Mairh
2,083 Points
Harshvardhan Mairh
Harshvardhan Mairh
2,083 Points

Thank you Philip. Really appreciate your help.