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

Charles Van Way
Charles Van Way
5,814 Points

What is the name of the field in mSpaceship that has the number of passengers? Or is there another way?

The question is to use the field in mSpaceship which contains the number of passengers to update the mPassengersField string variable. But we don't know the name of the field in mSpaceship. Is there a way of doing this which does not involve knowing the name of that field?

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);

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

        // Add your code here!
        mSpaceship = new Spaceship("FIREFLY");
        mTypeLabel.setText(mSpaceship.getType());
        mPassengersField.setText(mSpaceship.getPassengers().toString());
    }
}
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

Dan Johnson
Dan Johnson
40,532 Points

At the top of the file you should be able to select different tabs, and one will contain the definition of Spaceship (It also got pulled in here for the post). The getter you'll need is getNumPassengers.

One more thing, if you want to use toString on a regular int you'll need to us the Integer wrapper class:

new Integer(mSpaceship.getNumPassengers()).toString()

Or you could use a different concatenation method, like adding an empty string.