android - 为什么构造函数 ArrayAdapter(new View.OnKeyListener(){}, int, String[]) 未定义

Question

为什么在我的编码中未定义构造函数 ArrayAdapter(new View.OnKeyListener(){}, int, String[]) 。当键入的字数超过 3 个字符时，此编码用于从 SQLite 中获取数据。但是，它显示以下错误。

The constructor ArrayAdapter(new View.OnKeyListener(){}, int, String[]) is undefined

ed1 = (AutoCompleteTextView)findViewById(R.id.searchWord);
ed1.setOnKeyListener(new View.OnKeyListener()
{
    Integer count = 0;
    String typeWord = "";
    public boolean onKey(View v, int keyCode, KeyEvent event)
    {                   
        if (KeyEvent.ACTION_DOWN == event.getAction()) {
            if (keyCode != 67) {
                count++;
                char c = (char)event.getUnicodeChar();
                typeWord = typeWord + c;
            }
            else {
                count--;
            }
            if (count > 2 && typeWord != "") {                                                                              
                countries = getAutosuggestWord(typeWord);
                ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, R.layout.autosuggest, countries);
                ed1.setAdapter(adapter);                            
            }
        }                       
        return false;                       
    }              
});

Answer 1

当您想要引用内部类的封闭类时，您需要限定 this 的使用。在您的代码中，如果封闭类是您的 Activity 子类(假设它称为 MyActivity)，那么您将编写:

ArrayAdapter<String> adapter = new ArrayAdapter<String>(MyActivity.this,
   R.layout.autosuggest,
   countries);