LinearLayout cannot be cast to TextView : tutorial Creating Lists and Cards

Question

I'm trying to follow the Android official doc for Creating Lists and Cards.

I found here that it was necessary to cast in TextView the ViewHolder but when I do it I have the following error: java.lang.ClassCastException: android.widget.LinearLayout cannot be cast to android.widget.TextView

My Adapter

public class CardsViewAdapter extends RecyclerView.Adapter<CardsViewAdapter.ViewHolder> {
    private Game[] mDataset;

    // Provide a reference to the views for each data item
    // Complex data items may need more than one view per item, and
    // you provide access to all the views for a data item in a view holder
    public static class ViewHolder extends RecyclerView.ViewHolder {
        // each data item is just a string in this case
        public TextView mTextView;
        public ViewHolder(TextView v) {
            super(v);
            mTextView = (TextView) v.findViewById(R.id.textViewName);
        }
    }

    // Provide a suitable constructor (depends on the kind of dataset)
    public CardsViewAdapter(Game[] myDataset) {
        mDataset = myDataset;
    }

    // Create new views (invoked by the layout manager)
    @Override
    public CardsViewAdapter.ViewHolder onCreateViewHolder(ViewGroup parent,
                                                   int viewType) {
        // create a new view
        View v = LayoutInflater.from(parent.getContext())
                .inflate(R.layout.cards_resume_game, parent, false);
        // set the view's size, margins, paddings and layout parameters
        //...

        ViewHolder vh = new ViewHolder((TextView) v);
        return vh;
    }

    // Replace the contents of a view (invoked by the layout manager)
    @Override
    public void onBindViewHolder(ViewHolder holder, int position) {
        // - get element from your dataset at this position
        // - replace the contents of the view with that element
        holder.mTextView.setText(mDataset[position].getId_game());

    }

    // Return the size of your dataset (invoked by the layout manager)
    @Override
    public int getItemCount() {
        return mDataset.length;
    }
}

My Custom View XML

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:tag="cards main container">

    <android.support.v7.widget.CardView
        android:id="@+id/card_view"
        xmlns:card_view="http://schemas.android.com/apk/res-auto"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        card_view:cardBackgroundColor="@color/blue_50"
        card_view:cardCornerRadius="10dp"
        card_view:cardElevation="5dp"
        >


        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="horizontal"
            >
                <TextView
                    android:id="@+id/textViewName"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_gravity="center_horizontal"
                    android:layout_marginTop="10dp"
                    android:text="Large Text"
                    android:textAppearance="?android:attr/textAppearanceLarge"/>

        </LinearLayout>

    </android.support.v7.widget.CardView>

</LinearLayout>

Answer 1

You have those 2 mixed up. Assuming that in

// create a new view
    View v = LayoutInflater.from(parent.getContext())
            .inflate(R.layout.cards_resume_game, parent, false);

the R.layout.cards_resume_game is LinearLayout , you should then have:

ViewHolder vh = new ViewHolder(v);

and have ViewHolder constructor accept a view:

public ViewHolder(View v) {
    mTextView = (TextView) v.findViewById(R.id.some_text_view_id);
}

where some_text_view_id is a TextView in said layout, which will be fetched by findViewById()

Answer 2

In your adapter you are casting TextView to ViewHolder which isn't necessary, and you are also calling ViewHolder in a redundant way. Try this:

return new ViewHolder(v) instead of ViewHolder vh = new ViewHolder((TextView)

The reason you do not need this cast is because you are already casting mView under your ViewHolder constructor, or rather you're already defining the view it should expect.