android - 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 来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。为此，我使用了 recyclerview 适配器。

What i want: From that recycleView adapter, when user clicks on delete button for an item, a dialog fragment is shown and user has to enter a code when that code is valid then the item is removed from both the database and the recyclerView

What i've tried: After calling the show() method on the dialogFragment in the adapter, i'm calling removeItem(getPostion()).

What i get: When the dialog shows up, the item is removed from the recyclerView before the user enters the code but is still in the databaseI 've tried other things but none of them worked.

求助!!!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!

但是根据您的需要:在用户输入正确的代码后从数据库和回收站 View 中删除项目。所以，基本上你可以通过一些步骤达到它:

1. 为每个 recyclerview 项目(或项目上的按钮)创建监听器，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 View :

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

-> 从数据库中删除数据(如何删除取决于你的)

如果数据没有从你的数据库中删除，请调试你的删除函数是否被调用，如果它有效，或者有任何错误!

希望对您有所帮助!