Question

我实现了一个AutoCompleteTextView，每次用户输入新的文本输入时，都会从服务器更新数据。它运作良好。但是，每次输入新查询时，都会显示先前的结果，直到更新新结果集。

我的猜测是它显示当前查询的结果，直到后端响应新的搜索结果。有没有办法清除当前的结果？

活动代码：

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

    actv = (AutoCompleteTextView) findViewById(R.id.actv);
    actv.setThreshold(1);
    actv.setAdapter(new SearchSuggestionsAdapter(this, actv.getText().toString()));

自定义适配器：

public class SearchSuggestionsAdapter extends ArrayAdapter<String> {

    List<String> types = new ArrayList<>();
    protected static final String TAG = "SuggestionAdapter";
    private List<String> suggestions;
    private Context context;

    public SearchSuggestionsAdapter(Activity context, String nameFilter) {
        super(context, android.R.layout.simple_dropdown_item_1line);
        suggestions = new ArrayList<String>();
        this.context = context;
    }

    @Override
    public int getCount() {
        return suggestions.size();
    }

    @Override
    public String getItem(int index) {
        return suggestions.get(index);
    }

    @Override
    public Filter getFilter() {
        Filter myFilter = new Filter() {
            @Override
            protected FilterResults performFiltering(CharSequence constraint) {
                FilterResults filterResults = new FilterResults();

                if (constraint != null) {

                    //Get new results from backend
                    //searchItemsFromServer is the method that returns the data
                    //new data is successfully sent. no problem there
                    List<String> new_suggestions = searchItemsFromServer(constraint.toString());
                    suggestions.clear();
                    for (int i = 0; i < new_suggestions.size(); i++) {
                        suggestions.add(new_suggestions.get(i));
                    }

                    filterResults.values = suggestions;
                    filterResults.count = suggestions.size();
                }
                return filterResults;
            }

            @Override
            protected void publishResults(CharSequence contraint,
                                          FilterResults results) {
                if (results != null && results.count > 0) {
                    notifyDataSetChanged();
                } else {
                    notifyDataSetInvalidated();
                }
            }
        };
        return myFilter;
    }
}

提前谢谢！

Answer 1

将您的活动代码更改为此

<XA.YA> = (XA)^T (YA)

        = tf.reduce_sum(tf.multiply((X A) , (Y A)), axis = 1)

将以下代码添加到SearchSuggestionsAdapter

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

    searchSuggestionsAdapter = new SearchSuggestionsAdapter(this, actv.getText().toString());
    actv = (AutoCompleteTextView) findViewById(R.id.actv);
    actv.setThreshold(1);
    actv.setAdapter(searchSuggestionsAdapter);
    actv.setOnFocusChangeListener(new OnFocusChangeListener() {

        @Override
        public void onFocusChange(View v, boolean hasFocus) {

            if(!hasFocus){
              searchSuggestionsAdapter.clear();
            }
        }
    });
}

Answer 2

 actv.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                suggestionAdapter.clear;
            }
        });

当用户点击自动完成时删除旧适配器。但为此你需要首先定义suggesstionAdapter。并且每次更新此适配器并将其设置为自动完成

Answer 3

过滤前清除建议。致电adapter.clear();

在适配器中添加新方法

public void clear() {
        suggestions.clear();
        notifyDataSetChanged();
    }

AutoCompleteTextView适配器返回旧值

3 个答案: