RecyclerView handles onClick from activity rather than from adapter

public class MainActivity extensions AppCompatActivity{

    Activity thisActivity = this;

    List<HashMap<String, String>>worldDatas=new ArrayList<>();;

    String sdPath=getExternalStoragePath();
    final String WORLD_NAME_KEY="name";
    final String WORLD_PATH_KEY="path";
    final String WORLD_SIZE_KEY="size";

    RecyclerView worldInfoContainer;

    @ Override
    protected void onCreate (Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.content_main);
        Toolbar toolbar= (Toolbar) findViewById (R.id.toolbar);
        setSupportActionBar (toolbar);

        updateWorldsList();
    }

// Update list data from terminal folder
    private void updateWorldsList(){
        worldInfoContainer= (RecyclerView) findViewById (R.id.worldInfoContainer);
        worldDatas=new ArrayList<>();
        //...

        worldInfoContainer.setLayoutManager (new LinearLayoutManager (thisActivity));
        worldInfoContainer.setHasFixedSize(true);

        worldInfoContainer.setAdapter (new WorldDataAdapter (thisActivity, worldDatas));
    }
// Clear Directory
    public void deleteDirectory (File file) {
        //...
    }

    public static String getExternalStoragePath(){
        //...
    }
}

public class WorldDataAdapter extensions RecyclerView.Adapter<WorldDataAdapter.ViewHolder>{
    private LayoutInflater mLayoutInflater;

    List<HashMap<String, String>>worldDatas=new ArrayList<>();;

    final String WORLD_NAME_KEY="name";
    final String WORLD_PATH_KEY="path";
    final String WORLD_SIZE_KEY="size";

    public WorldDataAdapter (Context context, List <HashMap<String, String > > dataList) {
        super();
        mLayoutInflater=LayoutInflater.from(context);
        worldData=dataList;
    }

    @ Override
    publicWorldDataAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, intviewType){
        View v=mLayoutInflater.inflate(R.layout.template_world_info, parent, false);
        ViewHolder viewHolder = new ViewHolder(v);

        return viewHolder;
    }

    @ Override
    public int getItemCount(){
        return worldDatas.size();
    }

    @ Override
    public void onBindViewHolder(ViewHolder holder, final int position) {

        final HashMap<String, String>positionData=worldData.get(position);

        holder.worldNameText.setText(positionData.get(WORLD_NAME_KEY)));
        holder.worldPathText.setText(positionData.get(WORLD_PATH_KEY)));
        holder.worldSizeText.setText(positionData.get(WORLD_SIZE_KEY)));

        holder.deleteButton.setOnClickListener(newView.OnClickListener(){
            @ Override
            public void onClick (View view) {
                // I want to do it with MainActivity
            }
        });
    }

    static classViewHolder extensionsRecyclerView.ViewHolder{
        TextView worldNameText;
        TextView worldPathText;
        TextView worldSizeText;

        ImageButton deleteButton;
        public ViewHolder (final View v) {
            super(v);

            worldNameText=(TextView) v.findViewById (R.id.worldNameText);
            worldPathText=(TextView) v.findViewById (R.id.worldPathText);
            worldSizeText=(TextView) v.findViewById (R.id.worldSizeText);

            deleteButton=(ImageButton) v.findViewById (R.id.deleteButton);
        }
    }
}