Android Studio : E/RecyclerView: No adapter attached; skipping layout - android-recyclerview

Question

I've found only a few articles related to this issue on StackOverflow tried all of their solutions in various combinations but can't get the RecyclerView to display my RecyclerView.Adapter that is populated with data which a I can verify and see the list in debug mode but it simply won't show the information.
My code (I struggled to paste the XML Layout files):
public class RecipeDetailActivity extends AppCompatActivity {
private RecipeModel mRecipe;
private ArrayList<IngredientModel> mIngredientList = new ArrayList<>();
private IngredientListAdapter ingredientListAdapter;
private RecyclerView rvIngredientList;
private boolean mTwoPane;
private ListView listView;
#Override
protected void onCreate(#Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_recipe_detail);
rvIngredientList = (RecyclerView)findViewById(R.id.rv_ingredient_list);
LinearLayoutManager layoutManager = new LinearLayoutManager(this);
layoutManager.setOrientation(LinearLayoutManager.VERTICAL);
rvIngredientList.setLayoutManager(layoutManager);
SampleRecycler sampleRecycler = new SampleRecycler(); // empty RecyclerView.Adapter
rvIngredientList.setAdapter(sampleRecycler);
mRecipe = getIntent().getParcelableExtra("com.wernerraubenheimer.bakingapp.data.RecipeModel");
mIngredientList = mRecipe.getIngredients();
ingredientListAdapter = new IngredientListAdapter(mIngredientList);
ingredientListAdapter.notifyDataSetChanged();
// Up until this point the RecyclerVie.Adapter is populated with data - debug mode I can see the list
rvIngredientList.swapAdapter(ingredientListAdapter, false);
}
}
public class IngredientListAdapter extends RecyclerView.Adapter<IngredientListAdapter.IngredientViewHolder> {
private ArrayList<IngredientModel> mIngredientList;
private Context mContext;
private boolean mTwoPane;
public IngredientListAdapter(ArrayList<IngredientModel> ingredientList) {
mIngredientList = ingredientList;
}
#Override
public IngredientViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
mContext = parent.getContext();
int layoutIdForListItem = R.layout.ingredient_list_item;
LayoutInflater inflater = LayoutInflater.from(mContext);
boolean attachImmediatelyToParent = false;
View view = inflater.inflate(layoutIdForListItem, parent, attachImmediatelyToParent);
IngredientViewHolder viewHolder = new IngredientViewHolder(view);
return viewHolder;
}
#Override
public void onBindViewHolder(IngredientViewHolder holder, int position) {
IngredientModel ingredient = mIngredientList.get(position);
holder.bind(mContext, ingredient);
}
#Override
public int getItemCount() {
if (mIngredientList != null) {
return 0;
} else {
return mIngredientList.size();
}
}
static class IngredientViewHolder extends RecyclerView.ViewHolder {
private CardView cardviewContainer;
private TextView tvIngredientName;
private TextView tvIngredientQuantity;
private TextView tvIngredientMeasure;
private Context mContext;
private IngredientModel mIngredient;
IngredientViewHolder(View itemView) {
super(itemView);
//cardviewContainer = (CardView)itemView.findViewById(R.id.card_view_ingredient);
tvIngredientName = (TextView)itemView.findViewById(R.id.text_view_ingredient_name);
tvIngredientQuantity =(TextView)itemView.findViewById(R.id.text_view_quantity);
tvIngredientMeasure = (TextView)itemView.findViewById(R.id.text_view_measure);
}
void bind(Context context, IngredientModel ingredientModel) {
mContext = context;
mIngredient = ingredientModel;
tvIngredientName.setText(mIngredient.getIngredient());
tvIngredientQuantity.setText(mIngredient.getQuantity());
tvIngredientMeasure.setText(mIngredient.getMeasure());
}
}
}

Answer 1

Although, it is difficult to decipher from the code you have pasted,
it looks like the problem is with the following function:
#Override
public int getItemCount() {
if (mIngredientList != null) {
return 0;
} else {
return mIngredientList.size();
}
}
Changing condition to if (mIngredientList == null) { should solve the problem.
Also, in the RecipeDetailActivity.onCreate() method, only following code should be enough to display the list:
#Override
protected void onCreate(#Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_recipe_detail);
rvIngredientList = (RecyclerView) findViewById(R.id.rv_ingredient_list);
rvIngredientList.setLayoutManager(new LinearLayoutManager(this));
mRecipe = getIntent().getParcelableExtra("com.wernerraubenheimer.bakingapp.data.RecipeModel");
mIngredientList = mRecipe.getIngredients();
ingredientListAdapter = new IngredientListAdapter(mIngredientList);
rvIngredientList.setAdapter(ingredientListAdapter);
}