AutoCompleteTextView 不显示下拉菜单 - Android

Question

我已经按照 material.io 构建了一个“暴露的下拉菜单”，但是下拉菜单没有显示。

我想实现这个： Dropdown (screenshot from material.io)

但是，我目前得到的是：Failed dropdown

我不确定为什么我在将“android:inputType="none"" 添加到 AutoCompleteTextView 后还能在框中输入内容。

这就是我在片段中初始化适配器的方式：

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    // Inflate the layout for this fragment
    View view = inflater.inflate(R.layout.fragment_add, container, false);

    // Initialise drop down list
    ArrayAdapter<String> adapter = new ArrayAdapter<>(
            getContext(),
            R.layout.dropdown_menu_popup_item,
            UNITS
    );

    AutoCompleteTextView unitsExposedDropdown = view.findViewById(R.id.unit_selection);
    unitsExposedDropdown.setAdapter(adapter);

    return view;
}

感谢您的帮助！

编辑：这是我用来构建公开下拉菜单的 link https://material.io/develop/android/components/menu

Answer 1

dont want to type in the box

那你为什么不使用弹出菜单看这个：

PopupMenu popup = new PopupMenu(youractivity.this, yourbutton);  
                //Inflate the pop up menu
                popup.getMenuInflater().inflate(R.menu.popmenu, popup.getMenu());  
  
                //do something on click 
                popup.setOnMenuItemClickListener(new PopupMenu.OnMenuItemClickListener() {  
                    public boolean onMenuItemClick(MenuItem item) {  
                      //do your work here
                    }  
                });  
  
                popup.show();//show it

要了解更多信息，请参阅此 https://developer.android.com/reference/android/widget/PopupMenu

AutoCompleteTextView 不显示下拉菜单 - Android

AutoCompleteTextView not showing drop down menu - Android

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