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Android

Posted by Kenneth Phillips
Kenneth Phillips
Courses Plus Student 10,188 Points

How to get an int value from a void method?

I have an app where if the user gets a question right in the box then it will add a point. After the actual game activity finishes I launch a new activity where they can submit their score. I need to get the point value from the previous activity but I can't because the whole checkAnswer() returns void. How would I get the point value over to my other activity?

public class GameActivity extends AppCompatActivity {

private Game game;
private ImageView gameImageView;
private TextView gameTextView;
private Button submitButton;
private TextView pointsTextView;
private int points;


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

    gameImageView = (ImageView) findViewById(R.id.gameImageView);
    gameTextView = (TextView) findViewById(R.id.gameTextView);
    pointsTextView = (TextView) findViewById(R.id.pointsTextView);
    submitButton = (Button) findViewById(R.id.submitButton);
    game = new Game();
    loadPage(0);
    checkAnswer(0);
}


private void loadPage(final int pageNumber) {


    final Page page = game.getPage(pageNumber);

    if (page.isFinalPage()) {
        startSubmit();
    }

    Drawable image = ContextCompat.getDrawable(this, page.getImageId());
    gameImageView.setImageDrawable(image);


    String pageText = getString(page.getTextId());
    gameTextView.setText(pageText);

    final int nextPage = page.getNextPage();


    submitButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            loadPage(nextPage);
            checkAnswer(nextPage);
        }
    });

}

private void checkAnswer(int pageNumber) {
    final Page page = game.getPage(pageNumber);
    String gameAnswer = page.getAnswer();
    String gameEditText = ((EditText) findViewById(R.id.gameSquare)).getText().toString();
    if (gameEditText.equals(gameAnswer)) 
        points++;


    String pointsText = String.format("%1$s", points);
    pointsTextView.setText(pointsText);
}


private void startSubmit() {
    Intent submitIntent = new Intent(this, SubmitActivity.class);
    startActivity(submitIntent);
}

public int getPoints() {
    return points;
}

}

4 Answers

Kenneth Phillips
Kenneth Phillips
Courses Plus Student 10,188 Points

In my other activity I'm trying to retrieve this value but the app crashes.

   public TextView finalScoreTextView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_submit);
        String points = getIntent().getStringExtra("POINTS");

        finalScoreTextView = (TextView) findViewById(R.id.scoreTextView);
        String text = String.format("Score: %1$s", points);
        finalScoreTextView.setText(text);
    }

Do you see a problem?

Ben Deitch
Ben Deitch
Treehouse Teacher
Ben Deitch
Ben Deitch
Treehouse Teacher

What error does it show?

Ben Deitch
STAFF
Ben Deitch
Treehouse Teacher
Ben Deitch
Ben Deitch
Treehouse Teacher

Hey Kenneth! You can pass the 'points' field to the other Activity inside the Intent:

private void startSubmit() {
    Intent submitIntent = new Intent(this, SubmitActivity.class);
    submitIntent.putExtra("POINTS", points);
    startActivity(submitIntent);
}
Kenneth Phillips
PLUS
Kenneth Phillips
Courses Plus Student 10,188 Points
Kenneth Phillips
Kenneth Phillips
Courses Plus Student 10,188 Points

It throws a FileNotFound error almost 20 times. Other than that it won't tell me the issue. It did this before and a moderator told me not to worry about it.

Ben Deitch
Ben Deitch
Treehouse Teacher
Ben Deitch
Ben Deitch
Treehouse Teacher

Gotcha. If it's something you can move past, 'don't worry about it' is usually good advice :)

Kenneth Phillips
PLUS
Kenneth Phillips
Courses Plus Student 10,188 Points
Kenneth Phillips
Kenneth Phillips
Courses Plus Student 10,188 Points

Alright well it appears maybe this a problem with my IDE or something got corrupted. Thanks for the help anyway.