TestActivity.java

public class TestActivity extends ParentActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        nextButton = (Button) findViewById(R.id.nextButton);
        nextButton.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
                nextQuestion();
            }
        });
    }

    private void nextQuestion() {
        if (currentTest.incrementQuestionIndex()) {
            drawQuestion();
        } else {
            finishTest();
        }
    }

    private void finishTest() {
        user.saveTest(currentTest);
        Intent intent = new Intent(this, ResultActivity.class);
        startActivity(intent);
        finish();
    }
}