ClickListener on list Adapter

Add a ClickListener to a ListAdapter, in this case a RecyclerView.Adapter.

Within list Adapter class (called ItemListAdapter in this example):
    private final ListItemClickListener mOnClickListener; // Declare field for OnClickListener
    public interface ListItemClickListener { // Create custom interface for your OnClickListener
        void onListItemClick (int item);
    }
    public ItemListAdapter(int numberOfItems, ListItemClickListener listItemClickListener) { // Add as parameter to Adapter constructor
        mNumberItems = numberOfItems;
        mOnClickListener = listItemClickListener;
    }
    class NumberViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener { // In class that generates item View implement View.OnClickListener
        public NumberViewHolder(View itemView) {
            super(itemView);
            itemView.setOnClickListener(this); // Set an
        }
        @Override // Override onClick
        public void onClick(View v) {
            mOnClickListener.onListItemClick(getAdapterPosition()); // Call custom interface instance
        }
    }

Within Activity.
public class MainActivity extends AppCompatActivity implements ItemListAdapter.ListItemClickListener { // Implement the custom interface
        mAdapter = new ItemListAdapter(NUM_LIST_ITEMS, this); // Second parameter produces custom OnClickListener in constructor
    @Override // Override the onListItemClick from the custom interface
    public void onListItemClick(int item) {
        if (mToast != null) {
            mToast.cancel();
        }
        Context context = this;
        CharSequence text = "Item number: " + item;
        int duration = Toast.LENGTH_SHORT;
        mToast = Toast.makeText(context, text, duration);
        mToast.show();
    }
}

ud851-Exercises-student\Lesson03-Green-Recycler-View\T03.07-Exercise-RecyclerViewClickHandling

ud851-Sunshine-student\ud851-Sunshine-student\S03.02-Exercise-RecyclerViewClickHandling