从数据库中删除项目后如何从 recyclerView 中删除项目

Question

我正在使用 recyclerView 显示当用户单击每个项目的删除按钮时可以删除的项目列表。为了做到这一点，我使用了一个 recyclerview 适配器。

我想要什么： 从那个 recycleView 适配器中，当用户单击项目的删除按钮时，会显示一个对话框片段，并且当该代码有效时用户必须输入代码，然后该项目是从数据库和recyclerView中删除

我的尝试：在适配器中的 dialogFragment 上调用 show() 方法后，我正在调用 removeItem(getPostion())。

我得到了什么：当对话框出现时，在用户输入代码之前，该项目已从 recyclerView 中删除，但仍在数据库中 我尝试了其他方法，但都没有奏效。

请帮忙！！！ RecyclerView 适配器 (EBAdapter)

public EBViewHolder(View itemView) {
        super(itemView);
            contact_row = (LinearLayout) itemView.findViewById(R.id.contact_row);
            contact_row.setOnClickListener(this);
            contact_photo = (ImageView) itemView.findViewById(R.id.contact_photo);
            contact_photo.setOnClickListener(this);
            contact_fullname = (TextView) itemView.findViewById(R.id.contact_fullname);
            contact_relationship = (TextView) itemView.findViewById(R.id.contact_relationship);
            contact_action = (ImageView) itemView.findViewById(R.id.contact_action);
            contact_action.setOnClickListener(this);
            contact_discard = (ImageView) itemView.findViewById(R.id.discard_action);
            contact_discard.setOnClickListener(this);
        }

    @Override
    public void onClick(View view){
        //Handling recyclerView action clicked
        String status;
        if(view instanceof ImageView) {
            if (view == contact_photo) {
                Log.d("Contact", contact_photo.getId() + "photo " + getPosition() + "clicked");
                ShowContactPhoto dialog = new ShowContactPhoto();
                dialog.setStyle(DialogFragment.STYLE_NO_TITLE,0);
                dialog.show(manager, "ScP_dialog");


            }

            if (view == contact_action) {
                Log.d("Contact", contact_fullname.getText() + "action " + getPosition() + "clicked");
                status = "active";
                Date created_at = new Date();
                Date updated_at = new Date();
                AddInEmergencyBase dialog = new AddInEmergencyBase(((BitmapDrawable)contact_photo.getDrawable()).getBitmap(), contact_fullname.getText().toString(),contact_relationship.getText().toString(),status,created_at.toString(),updated_at.toString());

                dialog.show(manager, "AiB_dialog");
                Log.d("Contact", "Dialog Dismissed now");

            }
//REGION OF INTEREST:
                if (view == contact_discard) {
                    Log.d("Contact", contact_discard.getId() + "photo " + getPosition() + "clicked");
                    status = "inactive";
                    dialog = new  DiscardEmergencyPers(contact_fullname.getText().toString(),status,mModels,getPosition(),rc);

                
                position = getPosition();
                
                dialog.show(manager, "DeP_dialog");
                //dialog.getDialog().setOnDismissListener(this);
                //onDismiss(dialog);
                removeItem(getPosition());
                Log.d("Contact", dialog.getDialog()+"item removed from data actually updated so hihihi....");
                /*ShowContactPhoto dialog = new ShowContactPhoto();
                dialog.setStyle(DialogFragment.STYLE_NO_TITLE, 0);
                dialog.show(manager, "ScP_dialog");*/


            }
        }
        else{
            Log.d("Contact", contact_row.getId() + "row " + getPosition() + "clicked");
        }

DialogFragment (DiscardEmergencyPers)

public class DiscardEmergencyPers extends DialogFragment implements View.OnClickListener, AdapterView.OnItemSelectedListener,DialogInterface.OnDismissListener, DialogInterface {
    private final String fullname;
    private final List<EmBaseInfo> mModels;
    private final String status;
    private final int position;
    private final RecyclerView rc;

//private final String updated_at;
EditText pin_code;
Button cancel, done;
Communicator com;
private EmergenciaDBAdapter emergencia_helper;
private Context context;
private RecyclerView recycler_view;

public DiscardEmergencyPers(String fullname, String status,List<EmBaseInfo> mModels, int position, RecyclerView rc){
    this.fullname=fullname;
    this.status = status;
    this.mModels = mModels;
    this.position = position;
    this.rc =rc;

}
@Override
public void onAttach(Activity activity) {
    super.onAttach(activity);
    com = (Communicator) activity;
}

@Nullable
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    View view = inflater.inflate(R.layout.dialog_discardemperson, null);
    context = getActivity().getApplicationContext();
    getDialog().setTitle("Remove emergency contact");
    //Spinner that contains relationships with the current contact
    pin_code = (EditText) view.findViewById(R.id.pin);

    /*ArrayAdapter adapter = ArrayAdapter.createFromResource(context, R.array.relationship, android.R.layout.simple_spinner_dropdown_item);
    relationship_spinner.setAdapter(adapter);
    relationship_spinner.setOnItemSelectedListener(this);*/
    //End of Spinner
    //

    emergencia_helper = new EmergenciaDBAdapter(context);
    //spinner = (Spinner)view.findViewById(R.id.spinner);
    cancel = (Button) view.findViewById(R.id.cancel);
    done = (Button) view.findViewById(R.id.done);
    cancel.setOnClickListener(this);
    done.setOnClickListener(this);

    setCancelable(false);
    return view;
}

@Override
public void onClick(View view) {
    if(view.getId()==R.id.cancel){
        dismiss();
        com.onDialogMessage("Cancel clicked");
    }
    else{
        com.onDialogMessage("Done clicked");
        if(pin_code.getEditableText().toString().equals("12345")){
            dismiss();

            emergencia_helper.update(status, fullname/*,updated_at*/);

            //EBAdapter n_adapter = new EBAdapter(getActivity(),removeItem(this.position),getFragmentManager(),rc);
            //rc.setAdapter(n_adapter);
            //rc.getAdapter().(this.position);

            rc.getAdapter().notifyDataSetChanged();
            rc.getAdapter().notifyItemRemoved(0);
            //Bundle savedInstanceState=null;

            //getActivity().onCreate(savedInstanceState);

            CharSequence text = "Good Pin "+rc.getAdapter();
            Log.d("Contacts", rc.getClass()+"");
            Log.d("Contacts", rc.getAdapter()+" "+getActivity());
            int duration = Toast.LENGTH_SHORT;
            Toast.makeText(context, text, duration).show();
        }
        else{
            CharSequence text = "Wrong Pin";
            //Log.d("Contacts", mModels.toString());
            int duration = Toast.LENGTH_SHORT;
            Toast.makeText(context, text, duration).show();
        }



        //long id=emergencia_helper.insert(photo,fullname,phone,relationship, status,created_at,updated_at);
        /*if(id<0){
            CharSequence text = "Row insertion unsuccessful ";
            //Log.d("Contacts", mModels.toString());
            int duration = Toast.LENGTH_SHORT;
            Toast.makeText(context, text, duration).show();
        }
        else{
            CharSequence text = "Row insertion successful ";
            //Log.d("Contacts", mModels.toString());
            int duration = Toast.LENGTH_SHORT;
            Toast.makeText(context, text, duration).show();
        }*/
    }
}    

Answer 1

你的代码很复杂！

但从你想要的：从数据库和recyclerview中删除项目在用户输入正确的代码后。所以，基本上你可以通过一些步骤来达到它：

1. 为每个 recyclerview 项目（或项目上的按钮）创建侦听器，当用户单击它时 -> 打开一个对话框。

2. 用户输入正确的代码后（你必须检查它是否正确）然后做两件事：

-> 通过适配器从 recyclerview 中删除视图：

dataSource.remove(index); // remember to remove it from your adapter data source
notifyItemRemoved(index);

-> 从数据库中删除数据（如何删除取决于您的）

如果数据没有从你的数据库中删除，请调试你的删除函数，如果它被调用，如果它工作，或者任何错误！

希望对您有所帮助！