获取当前建议从`AutoCompleteTextView` [英] Getting current suggestion from `AutoCompleteTextView`

问题描述

你如何在目前的顶级建议的 AutoCompleteTextView ？我有建议的项目，我有一个文本更改侦听器注册。本人也具有相同的屏幕上的列表。当他们打字，我想上滚动当前最好的建议。但我无法弄清楚如何访问当前的建议，或至少顶部建议。我想我在寻找类似 AutoCompleteTextView.getCurrentSuggestions（）：

  autoCompleteTextView.addTextChangedListener（新TextWatcher（）{
    公共无效onTextChanged（CharSequence中，诠释开始，诠释之前，诠释计数）{
            串currentText = autoCompleteTextView.getText（）;
            串bestGuess = autoCompleteTextView.getCurrentSuggestions（）[0];
            // ^^^ mewthod不存在
            doSomethingWithGuess（bestGuess）;
        }
        公共无效beforeTextChanged（CharSequence中，诠释开始，诠释计数，
                之后INT）{
            // 没做什么
        }
        公共无效afterTextChanged（编辑S）{
            // 没做什么
        }
    }）;
 

解决方案

我做你想要做以下code是什么：

  @覆盖
保护无效的onCreate（包savedInstanceState）{
    super.onCreate（savedInstanceState）;
    的setContentView（R.layout.autocomplete_1）;

    适配器=新的ArrayAdapter＆LT;字符串＆GT;（这一点，
            android.R.layout.simple_dropdown_item_1line，国家）;
    AutoCompleteTextView的TextView =（AutoCompleteTextView）findViewById（R.id.edit）;
    textView.setAdapter（适配器）;

    adapter.registerDataSetObserver（新DataSetObserver（）{
        @覆盖
        公共无效调用onChanged（）{
            super.onChanged（）;
            Log.d（TAG，数据集变）;
            对象项目= adapter.getItem（0）;

            Log.d（TAG，item.toString+ item.toString（））;
        }
    }）;
}
 

item.toString将打印上显示的第一个项目的文本。

请注意，这会发生，即使你不显示弹出式（建议）呢。此外，你应该检查是否存在通过筛选条件的任何物品（即用户输入）。

要解决的第一个问题：

  INT dropDownAnchor = textView.getDropDownAnchor（）;
    如果（dropDownAnchor == 0）{
        Log.d（TAG，下拉ID = 0）; //不显示弹出
        返回;
    }
    //做的东西
 

要解决的第二个问题，使用getCount将> 0

How do you get the current top suggestion in an AutoCompleteTextView? I have it suggesting items, and I have a text change listener registered. I also have a list on the same screen. As they type, I want to scroll the list to the current "best" suggestion. But I can't figure out how to access the current suggestions, or at least the top suggestion. I guess I'm looking for something like AutoCompleteTextView.getCurrentSuggestions():

autoCompleteTextView.addTextChangedListener(new TextWatcher() {
    public void onTextChanged(CharSequence s, int start, int before, int count) {
            String currentText = autoCompleteTextView.getText();
            String bestGuess = autoCompleteTextView.getCurrentSuggestions()[0];
            //                                      ^^^ mewthod doesn't exist
            doSomethingWithGuess(bestGuess);
        }
        public void beforeTextChanged(CharSequence s, int start, int count,
                int after) {
            // do nothing
        }
        public void afterTextChanged(Editable s) {
            // do nothing
        }
    });

解决方案

I've done what you want to do with the following code:

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.autocomplete_1);

    adapter = new ArrayAdapter<String>(this,
            android.R.layout.simple_dropdown_item_1line, COUNTRIES);
    AutoCompleteTextView textView = (AutoCompleteTextView) findViewById(R.id.edit);
    textView.setAdapter(adapter);

    adapter.registerDataSetObserver(new DataSetObserver() {
        @Override
        public void onChanged() {
            super.onChanged();
            Log.d(TAG, "dataset changed");
            Object item = adapter.getItem(0);

            Log.d(TAG, "item.toString "+ item.toString());
        }
    });
}

item.toString will print the text that is displayed on the first item.

Note that this will happen even if you aren't showing the pop-up (suggestions) yet. Also, you should check if there are any items that passed the filter criteria (aka the user's input).

To solve the first problem:

    int dropDownAnchor = textView.getDropDownAnchor();
    if(dropDownAnchor==0) {
        Log.d(TAG, "drop down id = 0"); // popup is not displayed
        return;
    }
    //do stuff

To solve the second problem, use getCount > 0

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