Attempt to invoke virtual method 'void android.widget.TextView.setText(java.lang.CharSequence)' on a null object reference error in Android

Question

I've had help on other questions trying to get this right but still having no luck just keep getting the same null object reference.

I have included the relevant files for this question, just can't get my head round this problem. Any suggestions greatly welcomed.

Recipe Class

    public class Recipe extends MainActivity {

    TabLayout tabLayout;
    ImageView recipeImage;
    TextView descriptionText, courseText, servingsText, costText, caloriesText, methodText;
    RecyclerView listIngredient;
    SQLiteDatabase db;
    String search_name;
    Cursor c;
    RecyclerViewAdapter adapterRecipe;
    List itemRecipe = new ArrayList<>();

    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.recipe);
        //search_name = getIntent().getStringExtra("NAME");
        search_name = "Speedy chicken couscous";

        loadRecipe();
        //recyclerview Recipe
        adapterRecipe = new RecyclerViewAdapter(this, itemRecipe);
        listIngredient = findViewById(R.id.listIngredient);

        RecyclerView.LayoutManager mLayoutManager = new LinearLayoutManager(this,
                LinearLayoutManager.VERTICAL, false);
        listIngredient.setLayoutManager(mLayoutManager);
        listIngredient.setItemAnimator(new DefaultItemAnimator());
        listIngredient.setAdapter(adapterRecipe);

    }
    public void loadRecipe() {
        itemRecipe.clear();
        db = (new DatabaseManager(this).getWritableDatabase());
        String RECIPE_SEARCH = " SELECT A.recipe, A.ingredient_quantity, B.measurement_name, B.ingredient_name, B.description " +
                "FROM " + DatabaseManager.TABLE_QUANTITY + " AS A JOIN " + DatabaseManager.TABLE_INGREDIENTS +
                " AS B ON A.ingredient = B.ingredient_name";
        String selectQuery = "";
        selectQuery = RECIPE_SEARCH + " WHERE A.recipe LIKE ?";
        c = db.rawQuery(selectQuery, new String[]{"%" + search_name + "%"});
        if (c.moveToFirst()) {
            do {
                RecipeList recipeList = new RecipeList();
                recipeList.setRecipe(c.getString(c.getColumnIndex("recipe")));
                recipeList.setIngredient_amount(c.getString(c.getColumnIndex("ingredient_quantity")));
                recipeList.setMeasurement_name(c.getString(c.getColumnIndex("measurement_name")));
                recipeList.setIngredient_name(c.getString(c.getColumnIndex("ingredient_name")));
                recipeList.setDescription(c.getString(c.getColumnIndex("description")));
                itemRecipe.add(recipeList);
            } while (c.moveToNext());
            c.close();
        }

    }
}

RecyclerAdapter

public class RecyclerViewAdapter extends RecyclerView.Adapter {

    private List itemRecipe;
    private LayoutInflater mInflater;
    private ItemClickListener mClickListener;

    // data is passed into the constructor
    RecyclerViewAdapter(Context context, List data) {
        this.mInflater = LayoutInflater.from(context);
        this.itemRecipe = data;
    }

    // inflates the row layout from xml when needed
    @Override
    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View view = mInflater.inflate(R.layout.fragment_item, parent, false);
        return new ViewHolder(view);
    }

    // binds the data to the TextView in each row
    @Override
    public void onBindViewHolder(ViewHolder holder, int position) {
        holder.myTextView.setText(itemRecipe.get(position).toString());

    }

    // total number of rows
    @Override
    public int getItemCount() {
        return itemRecipe.size();
    }


    // stores and recycles views as they are scrolled off screen
    public class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
        TextView myTextView;

        ViewHolder(View itemView) {
            super(itemView);
            myTextView = itemView.findViewById(R.id.listIngredient);
            itemView.setOnClickListener(this);
        }

        @Override
        public void onClick(View view) {
            if (mClickListener != null) mClickListener.onItemClick(view, getAdapterPosition());
        }
    }


    // allows clicks events to be caught
    void setClickListener(ItemClickListener itemClickListener) {
        this.mClickListener = itemClickListener;
    }

    // parent activity will implement this method to respond to click events
    public interface ItemClickListener {
        void onItemClick(View view, int position);
    }
}

RecipeList Model

public class RecipeList {

    private Integer id;
    private Double ingredient_quantity;
    private String recipe;
    private String measurement_name;
    private String ingredient_name;
    private String description;
    private String ingredient_amount = String.valueOf(ingredient_quantity);
    public RecipeList(){

    }

    public RecipeList(String recipe, String ingredient_amount, String measurement_name, String ingredient_name, String description) {

        this.recipe = recipe;
        this.ingredient_amount = ingredient_amount;
        this.measurement_name = measurement_name;
        this.ingredient_name = ingredient_name;
        this.description = description;
    }

    public String getRecipe() {
        return recipe;
    }

    public void setRecipe(String recipe) {
        this.recipe = recipe;
    }

    public String getIngredient_amount() {
        return ingredient_amount;
    }

    public void setIngredient_amount(String ingredient_amount) {
        this.ingredient_amount = ingredient_amount;
    }

    public String getMeasurement_name() {
        return measurement_name;
    }

    public void setMeasurement_name(String measurement_name) {
        this.measurement_name = measurement_name;
    }

    public String getIngredient_name() {
        return ingredient_name;
    }

    public void setIngredient_name(String ingredient_name) {
        this.ingredient_name = ingredient_name;
    }

    public String getDescription() {
        return description;
    }

    public void setDescription(String description) {
        this.description = description;
    }
    @Override
    public String toString() {
        return "RecipeList{" +
                "id=" + id +
                ", ingredient_quantity=" + ingredient_quantity +
                ", recipe='" + recipe + '\'' +
                ", measurement_name='" + measurement_name + '\'' +
                ", ingredient_name='" + ingredient_name + '\'' +
                ", description='" + description + '\'' +
                ", ingredient_amount='" + ingredient_amount + '\'' +
                '}';
    }
}

Update:

This is the line that causes the fault:

@Override
public void onBindViewHolder(ViewHolder holder, int position) {
    holder.myTextView.setText(itemRecipe.get(position).toString());

}

Fragment_item

Layout xml

Updated

I've changed myTextView = itemView.findViewById(R.id.listIngredient); to myTextView = itemView.findViewById(R.id.quantity);

The recyclerView is now displaying RecipeList{id=null, ingredient_quantity=null, recipe='Speedy chicken cous cous', measurement_name='tbsp', ingredient_name='fresh coriander',description='chopped', ingredient_amount = 1} And then this repeats for every ingredient whereas I want it to display 1 tbsp fresh coriander chopped Any ideas?

Attempt to invoke virtual method 'void android.widget.TextView.setText(java.lang.CharSequence)' on a null object reference error in Android

0 Answers