单击适配器类（ListView）

Question

我在我的适配器类中单击时需要一些帮助。 这是我想在单击项目时运行的代码。 connectOrDisconnectUser()

 private void connectOrDisconnectUser(final int position) {


        final AlertDialog.Builder builder = new AlertDialog.Builder(
                RelationshipRemoved.this);
        builder.setMessage("Do you want to un tag " + usersInfo.get(position).get(
                RelationshipRemoved.likedOne))
                .setCancelable(false)
                .setPositiveButton("Yes",

                        new DialogInterface.OnClickListener() {
                            //do something

                            public void onClick(DialogInterface dialog, int randomvar) {
                                Log.d("OkHttpRemove", "getting removing!");
                                String username = (globalInt);
                                String UT = usersInfo.get(position).get(
                                        RelationshipRemoved.likedOne);
                                String type = "remove";
                                BackgroundWorker backgroundWorker = new BackgroundWorker(getApplicationContext());
                                backgroundWorker.execute(type, username, UT);
                                startActivity(new Intent(RelationshipRemoved.this, MainActivity.class));
                                Toast.makeText(context, "UnTagged!",
                                        Toast.LENGTH_SHORT).show();


                            }
                        })
                .setNegativeButton("No",
                        new DialogInterface.OnClickListener() {
                            public void onClick(DialogInterface dialog,
                                                int id) {
                                dialog.cancel();
                            }
                        });
        final AlertDialog alert = builder.create();
        alert.show();
    }

保存适配器的文件称为AdapterClass，使用适配器类的类称为RelationshipRemoved。当我尝试编写此代码时。我在此行RelationshipRemoved.this，RelationshipRemoved.this);和startActivity上RelationshipRemoved.this startActivity(new Intent(RelationshipRemoved.this, MainActivity.class));收到错误bar

出了什么问题？