您需要将上下文强制转换为Activity，或者将onClickListener传递给适配器，如下所示
1.创建clickListener

public interface MyClickListener {
    void onItemClick(MyModel model);
}

1.在适配器类中：

public class MyAdapter extends RecyclerView.Adapter<ViewHolder> {
  private MyClickListener onClickListener;
  public MyAdapter(MyClickListener onClickListener) {
      this.onClickListener = onClickListener;
  }
  ...
}

1.在您的方法中：

holder.itemView.setOnClickListener(new View.OnClickListener() {

     @Override
     public void onClick(View view) {
         onClickListener.onItemClick(myModel);
     }
 });

1.在您的活动中：

MyAdapter adapter = new MyAdapter(new MyClickListener() {
     public void onItemClick(MyModel model) {
            /// here you can call startActivityForResult
     }
});