how to show start new activity in adapter code example

Example: startactivity not working in android adapter

holder.fab.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent(series.getApplicationContext(),VideoActivity.class);
                String url = response.get(position).getUrl();
                Bundle bundle = new Bundle();
                bundle.putString("key_1",url);
                intent.putExtras(bundle);
                mContext.startActivity(intent);
            }
        });