Null Pointer Exception when calling getResources()

Question

I\'m making a quiz program for android, and to keep things compatible for different languages, I\'ve put all my quiz questions and labels in my strings.xml file. Basically

Answer 1

For those that are interested, I got my code up and running with the following.

public class MainActivity extends AppCompatActivity {

    String[] questionHeaders, answerKey, questions;

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

        Resources res = getResources();
        questionHeaders = res.getStringArray(R.array.question_header_array);
        answerKey = res.getStringArray(R.array.answer_key_array);
        questions = res.getStringArray(R.array.questions_array);
    }

    int correctAnswers = 0;
    int questionCounter = 0;

1. Declared the three String[] arrays in the main activity before onCreate().
2. Initialize a 'Resources' object named res inside onCreate().
3. Call getStringArray on res to load each String[] array

Answer 2

My problem turned out to be that I was instantiating my widget (a CardView) with a null Context. Initializing the context object resolved the issue. For example, here is what my working code now looks like, but m_context was null when I was getting the same NullPointerException.

    CardView m_cardView = new CardView(m_context);

Answer 3

You're accessing resources too early, in MainActivity.<init> e.g. field initialization. You can only use your activity as a Context with Resources in onCreate() or later in the activity lifecycle.

Move the getResources() and getStringArray() calls to onCreate().