android - 数据未设置为 android 中 Multiautocompletetextview 的适配器

Question

嗨，我实现了 MultiAutocompleteTextview 我有两个 senerios 一个是显示列表第二个是数据库中已经存在的数据要设置到适配器。

但它不起作用任何人都可以帮助我

 provisional_diagnosisadapter = new ArrayAdapter<String>(getContext(), android.R.layout.simple_spinner_item, Pre_Conditions);
                        provisional_diagnosisadapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
                        pre_existing.setAdapter(provisional_diagnosisadapter);
                        pre_existing.setThreshold(1);
                        pre_existing.setTokenizer(new MultiAutoCompleteTextView.CommaTokenizer());
                        ArrayAdapter<String> adapter=(ArrayAdapter<String>)pre_existing.getAdapter();
                        if(isallergerys.equals("true")) {
                            int position1 = adapter.getPosition(pre_condition);
                            provisional_diagnosisadapter.notifyDataSetChanged();
                            pre_existing.setSelection(position1);
                        }
                            else {
                                int position1 = adapter.getPosition(preExistingCondition_dropdownList1.getCondition());
                                provisional_diagnosisadapter.notifyDataSetChanged();
                                pre_existing.setSelection(position1 + 1);
                            }

                        pre_existing.setOnItemClickListener(new AdapterView.OnItemClickListener() {
                            @Override
                            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                                if(position+1>0) {
                                    PreExistingCondition_DropdownList preExistingCondition_dropdownList1 = preExistingCondition_dropdownLists.get(position);

                                    preconid = preExistingCondition_dropdownList1.getId();
                                    precontname = preExistingCondition_dropdownList1.getCondition();
                                }
                            }
                        });
                    }