Andorid AlertDialog multiselect -允许用户添加选项

Question

我正在尝试创建一个警告对话框，用户可以从预定义的列表中选择多个选项，但是如果他们想要选择的选项不在那里，他们可以添加它们(通过edittext和“添加”按钮)。

到目前为止，我已经使用setCustomTitle将edittext和按钮添加到对话框的顶部，并且我能够将该项添加到我的源数据列表中，但是我不知道如何将其重新应用于对话框中的列表。

(筛选器模型只有一个字符串和一个布尔值来确定它是否被选中，所以如果用户重新打开对话框，我可以设置选定的项)

这是我到目前为止的代码。

 private void selectSomething() {
        AlertDialog.Builder selectSomethingBuilder = new AlertDialog.Builder(mContext);
        View header = getLayoutInflater().inflate(R.layout.common_multichoice_dialog_header, null);
        Button addButton = header.findViewById(R.id.btAdd);
        EditText et = header.findViewById(R.id.textView2);
        selectSomethingBuilder.setCustomTitle(header);
        addButton.setOnClickListener(v -> {
            cuisineList.add(new filterModel(et.getText().toString(), true));
            boolean[] selectedItems2 = new boolean[cuisineList.size()];
            for (int i = 0; i < cuisineList.size(); i++) {
                selectedItems2[i] = cuisineList.get(i).isSelected();
            }
            String[] updatedList = cuisineList.stream().map(filterModel::toString).toArray(String[]::new);

            //What to do here? How do I update the list of items with the newly added item

            et.setText("");

        });

        boolean[] selectedItems = new boolean[cuisineList.size()];
        for (int i = 0; i < cuisineList.size(); i++) {
            selectedItems[i] = cuisineList.get(i).isSelected();
        }
        selectSomethingBuilder.setMultiChoiceItems(cuisineList.stream().map(filterModel::toString).toArray(String[]::new), selectedItems,
                (dialog, which, isChecked) -> cuisineList.get(which).setSelected(isChecked));
        selectSomethingBuilder.setPositiveButton(R.string.ok, (dialog, id1) -> {
            setCuisineChips();
        });
        AlertDialog selectItems = selectSomethingBuilder.create();

        selectItems.show();
    }

Answer 1

好的，我是通过扩展AlertDialog.Builder实现的--对于遇到这种情况的任何人，这里是我正在使用的类：

public class multichoiceUserAddableDialog extends AlertDialog.Builder {
    private final Context context;
    private final MultiAdapter adapter;

    public multichoiceUserAddableDialog(Context context, List<filterModel> selectList) {
        super(context);
        this.context = context;

        LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        View header = inflater.inflate(R.layout.common_multichoice_dialog_header, null);
        Button addButton = header.findViewById(R.id.btAdd);
        EditText et = header.findViewById(R.id.textView2);
        this.setCustomTitle(header);
        adapter = new MultiAdapter(context, android.R.layout.simple_list_item_multiple_choice, selectList);

        addButton.setOnClickListener(v -> {
            selectList.add(new filterModel(et.getText().toString(), et.getText().toString(), true));
            et.setText("");
            adapter.notifyDataSetChanged();
        });
        setAdapter(adapter, (dialogInterface, i) -> {
          
        });

    }

    @Override
    public AlertDialog create() {
        AlertDialog x = super.create();
        x.getListView().setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
                ((filterModel) adapterView.getItemAtPosition(i)).setSelected(!((filterModel) adapterView.getItemAtPosition(i)).isSelected());
                adapter.notifyDataSetChanged();
            }
        });
        return x;
    }

    private class MultiAdapter extends ArrayAdapter<filterModel> {
        private List<filterModel> selectList;
        ViewHolder holder;

        public MultiAdapter(@NonNull Context context, int resource, @NonNull List<filterModel> selectList) {
            super(context, resource, selectList);
            this.selectList = selectList;
        }

        class ViewHolder {
            CheckedTextView itemTV;
        }

        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            final LayoutInflater inflater = (LayoutInflater) context
                    .getSystemService(Context.LAYOUT_INFLATER_SERVICE);

            if (convertView == null) {
                convertView = inflater.inflate(
                        android.R.layout.simple_list_item_multiple_choice, null);

                holder = new ViewHolder();
                holder.itemTV = convertView.findViewById(android.R.id.text1);

                convertView.setTag(holder);
            } else {
                holder = (ViewHolder) convertView.getTag();
            }
            holder.itemTV.setText(selectList.get(position).getText());
            holder.itemTV.setChecked(selectList.get(position).isSelected());
            return convertView;
        }

    }

}

然后按如下方式使用：

 multichoiceUserAddableDialog selectSomethingBuilder = new multichoiceUserAddableDialog(mContext, activityList);
        selectSomethingBuilder.setPositiveButton(R.string.ok, (dialog, id1) -> {
            setActivityChips();
        });
        AlertDialog selectItems = selectSomethingBuilder.create();
     
        selectItems.show();

filterModel有一个文本字段和一个布尔值(以及您想要的任何其他字段)，标题布局有一个editText和一个按钮(加上一个带有一些静态文本的textview )。