I’m building a calorie counting app. From the home screen, I’m trying to open the “Create entry” activity, but it crashes the instant I open it. I can’t tell why.

public class CreateEntryActivity extends AppCompatActivity {

private Spinner spinnerFood;
private EditText editTextGrams;
private EditText editTextDate;
private Button buttonSave;
private Button buttonCreateFood;
private List<Food> foods;





@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_create_entry);
    Food apple = new Food("Apple", 0.25, 0.5, 0.1, "None",1);
    foods.add(apple);
    ArrayAdapter<Food> adapter = new ArrayAdapter<>(this, android.R.layout.simple_spinner_item, foods);
    spinnerFood.setAdapter(adapter);
    spinnerFood = findViewById(R.id.spinnerFoodEntry);
    editTextGrams = findViewById(R.id.editTextGramsEntry);
    editTextDate = findViewById(R.id.editTextDateEntry);
    buttonSave = findViewById(R.id.buttonSaveEntry);
    buttonCreateFood = findViewById(R.id.buttonCreateFood);





    buttonCreateFood.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Intent intent = new Intent(CreateEntryActivity.this, CreateFoodActivity.class);
            startActivity(intent);

            Intent i = getIntent();
            Food food = (Food) i.getSerializableExtra("FOOD_KEY_");
            foods.add(food);
        }
    });
}

}

If I remove all the code and only leave the xml, the activity opens. I’m pretty much a newbie, can anyone tell me what I’m doing wrong, please?