How to update data in a Custom Dialog

Question

The user at the moment clicks on a row which contains data and a Dialog with text fields is displayed.
I want the user to update the strings by using this Dialog.

Answer 1

Here is a neat way to handle custom dialog class!

You can make MyDialog class to contain Builder class so that it handles buttonOnClick methods and text data.

my_dialog_layout.xml should contains 4 editTexts(name, category, quantity, importance) and 3 buttons(update, cancel, ok), as it is shown in your second picture. I won't post the xml code since it's not the critical part.

So in OnItemClickListener of the listView in EditActivity, you can

1. build the dialog
2. set default text on edit texts
3. set onClickListener for buttons

---

MyDialog class

public class MyDialog extends DialogFragment {

   public static final String SimpleName = MyDialog.class.getSimpleName();
   private EditText name,category, quantity, importance;
   private Button update, positive, negative;
   private Builder builder;

    private static MyDialog instance = new MyDialog();

    public static MyDialog getInstance(){
        return instance;
    }

   @Override
    public void onCreate(Bundle savedInstanceState) {
        this.setCancelable(true);

        if (savedInstanceState != null) {
            if (builder != null) {
                builder = savedInstanceState.getParcelable(Builder.class.getSimpleName());
            }
        }
        setRetainInstance(true);
        super.onCreate(savedInstanceState);
    }

    @NonNull
    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {
        Dialog dialog = super.onCreateDialog(savedInstanceState);
        // make the dialog's default background transparent so that you can customize the window
        dialog.getWindow().setBackgroundDrawable(new ColorDrawable(android.graphics.Color.TRANSPARENT));
        dialog.getWindow().requestFeature(Window.FEATURE_NO_TITLE);
        return dialog;
    }

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        return inflater.inflate(R.layout.my_dialog_layout, container, false);
    }

    @Override
    public void onViewCreated(View view, @Nullable final Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);
        initViews(view);
        if (builder != null) {

            if (builder.getTextName() != null) {
                name.setText(builder.getTextName());
            }
            if (builder.getTextCategory() != null) {
                category.setText(builder.getTextCategory());
            }
            if (builder.getTextQuantity() != null) {
                quantity.setText(builder.getTextQuantity());
            }
            if (builder.getTextImportance() != null) {
                importance.setText(builder.getTextImportance());
            }



            update.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    builder.getOnUpdateClicked().OnClick(view, getDialog());
                }
            });

            positive.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                   builder.getOnPositiveClicked().OnClick(view, getDialog());
                }
            });

            negative.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                  builder.getOnNegativeClicked().OnClick(view, getDialog());
                }
            });

        }
    }

    private void initViews(View view) {       
        name = (EditText) view.findViewById(R.id.editText_name);
        category = (EditText) view.findViewById(R.id. editText_category);
        quantity = (EditText) view.findViewById(R.id. editText_quantity);
        importance = (EditText) view.findViewById(R.id.editText_importance);
        update = (Button) view.findViewById(R.id.update);
        positive = (Button) view.findViewById(R.id.positive);
        negative = (Button) view.findViewById(R.id.negative);

    }

    private Dialog show(Activity activity, Builder builder) {             
         this.builder = builder;
         if (!isAdded()){
             show(((AppCompatActivity) activity).getSupportFragmentManager(), SimpleName);
         }
         return getDialog();
     }

    public static class Builder implements Parcelable  {

        private OnPositiveClicked onPositiveClicked;
        private OnNegativeClicked onNegativeClicked;
        private OnUpdateClicked onUpdateClicked;

        private textName;
        private textCategory;
        private textQuantity;
        private textImportance;

        private Context context;

        protected Builder(Parcel in) {
            textName = in.readString();
            textCategory = in.readString();
            textQuantity = in.readString();
            textImportance = in.readString();
        }

        public static final Creator<Builder> CREATOR = new Creator<Builder>() {
            @Override
            public Builder createFromParcel(Parcel in) {
                return new Builder(in);
            }

            @Override
            public Builder[] newArray(int size) {
                return new Builder[size];
            }
        };

        public Context getContext() {
            return context;
        }

        public Builder setActivity(Context context) {
            this.context = context;
            return this;
        }

        public Builder(Context context) {
            this.context = context;
        }

        public Builder setTextName(String textName) {
            this.textName = textName;
            return this;
        }

        public String getTextName() {
            return textName;
        }

        public Builder setTextCategory(String textCategory) {
            this.textCategory = textCategory;
            return this;
        }

        public String getTextCategory() {
            return textCategory;
        }

        public Builder setTextQuantity(String textQuantity) {
            this.textQuantity = textQuantity;
            return this;
        }

        public String getTextQuantity() {
            return textQuantity;
        }

        public Builder setTextImportance(String textImportance) {
            this.textImportance = textImportance;
            return this;
        }

        public String getTextImportance() {
            return textImportance;
        }


        public OnPositiveClicked getOnPositiveClicked() {
            return onPositiveClicked;
        }

        public Builder setOnPositiveClicked(OnPositiveClicked onPositiveClicked) {
            this.onPositiveClicked = onPositiveClicked;
            return this;
        }

        public OnNegativeClicked getOnNegativeClicked() {
            return onNegativeClicked;
        }

        public Builder setOnNegativeClicked(OnNegativeClicked onNegativeClicked) {
            this.onNegativeClicked = onNegativeClicked;
            return this;
        }

        public OnUpdateClicked getOnUpdateClicked() {
            return onUpdateClicked;
        }

        public Builder setOnUpdateClicked(OnUpdateClicked onUpdateClicked) {
            this.onUpdateClicked = onUpdateClicked;
            return this;
        }

        public Builder build() {
            return this;
        }

        public Dialog show() {
            return getInstance().show(((Activity) context), this);
        }

        @Override
        public int describeContents() {
            return 0;
        }

        @Override
        public void writeToParcel(Parcel parcel, int i) {
            parcel.writeString(textName);
            parcel.writeString(textCategory);
            parcel.writeString(textQuantity);
            parcel.writeString(textImportance);
        }

    }

    public interface OnPositiveClicked {
        void OnClick(View view, Dialog dialog);
    }

    public interface OnNegativeClicked {
        void OnClick(View view, Dialog dialog);
    }


}

---

EditActivity

build and show MyDialog in a listview OnItemClickListner.

listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
    @Override
    public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
            MyDialog.Builder dialog=null;

            // TODO get the strings from database at the position i
            String name = 
            String category = 
            String quantity = 
            String importance = 

            dialog.setTextName(name)
                .setTextCategory(category)
                .setTextQuantity(quantity)
                .setTextImportance(importance)
                .setOnPositiveClicked(new MyDialog.OnPositiveClicked() { 
                             @Override
                            public void OnClick(View view, Dialog dialog) {

                            }
                        })
                .setOnNegativeClicked(new MyDialog.OnNegativeClicked() { 
                            @Override
                            public void OnClick(View view, Dialog dialog) {

                            }
                        })
                .setOnUpdateClicked(new MyDialog.OnUpdateClicked() { 
                            @Override
                            public void OnClick(View view, Dialog dialog) {
                                // TODO update database here
                            }
                        })

                .build();
                dialog.show();
        }
    });

Hope it helps. Let me know if there is a mistake or a better way.