Question

我的操作栏中有一个SearchView窗口小部件，当用户输入一个或多个字符时，它会显示正确的建议搜索字词。

我想在SearchView为空时显示（不同的）建议列表，包括在用户输入任何文本之前。

到目前为止，当用户输入文本然后删除该文本时，它正常工作，当用户点击搜索图标打开窗口小部件时，一旦打开，第二次点击搜索窗口小部件。为此，我正在使用OnQueryTextListener，如此：

class SearchTextEnteredListener implements SearchView.OnQueryTextListener {

    @Override
    public boolean onQueryTextChange(String newText) {
        if (newText.length() > 1) {
            // Set normal suggestions
            CursorAdapter searchadapter = new SearchSuggestionsAdapter(mContext, suggestions);
            mSearchView.setSuggestionsAdapter(searchadapter);
        } else if (newText.length() == 1) {
            // Clear the displayed suggestions
            if(searchadapter != null && mSearchView != null){
                searchadapter.createAndChangeCursor(null);
            }
        } else {
            // Length = 0, show other suggestions
            CursorAdapter searchadapter = new SearchSuggestionsAdapter(mContext, otherSuggestions);
            mSearchView.setSuggestionsAdapter(searchadapter);
        }

        return false;
    }
}

但是，我希望一旦打开搜索小部件就会弹出建议，而不是像现在这样需要第二次点击。我没有运气这么做。

我甚至尝试手动查找SearchView的{{1}}并在AutoCompleteTextView获得焦点时调用showDropDown()（见下文），但是没有显示下拉。或者

SearchView

如何在打开搜索小部件时创建搜索建议下拉列表？

Answer 1

有可能。我使用compat v7 SearchView和Cursor Loaders与Activity生命周期协调查询。

// e.g in onCreateView in my Fragment, wire up the SearchView:
MenuItem searchMenuItem = toolbar.getMenu().findItem(R.id.search_menu_item);
SearchView searchView = (SearchView) MenuItemCompat.getActionView(searchMenuItem);
// and setup listeners (implementation is shown later)
searchView.setOnSuggestionListener(this);
searchView.setOnQueryTextListener(this);
searchView.setOnCloseListener(this);
// then raid the SearchView so search begins on 0 chars!
AutoCompleteTextView autoCompleteTextView = (AutoCompleteTextView) searchView.findViewById(android.support.v7.appcompat.R.id.search_src_text);
autoCompleteTextView.setThreshold(0);
// and set the suggestions adapter so we can use a Loader to do the queries
SuggestionCursorAdapter suggestionCursorAdapter = new SuggestionCursorAdapter(getContext(), null, 0);
searchView.setSuggestionsAdapter(suggestionAdapter);

以下是侦听器的实现：

@Override
public boolean onQueryTextChange(String userInput) {
    if (TextUtils.isEmpty(userInput.trim())) {
        Log.d(TAG, "onQueryTextChange: empty userInput");
        // The argument to the loader is null so your query should return all suggestions
        getLoaderManager().restartLoader(SEARCH_VIEW_LOADER_ID, null, this);
        return true;
    }

    userInput = userInput.trim();
    Bundle args = new Bundle();
    args.putString("USER_INPUT", userInput);
    // The argument contains the users input so your query should use a LIKE to find matching suggestions
    getLoaderManager().restartLoader(SEARCH_VIEW_LOADER_ID, args, this);
    return true;
}

@Override
public boolean onQueryTextSubmit(String query) {
    return true;
}

@Override
public boolean onClose() {
    return false;
}

@Override
public boolean onSuggestionSelect(int position) {
    return false;
}

@Override
public boolean onSuggestionClick(int position) {
    Cursor c = searchView.getSuggestionsAdapter().getCursor();
    final String suggestion = c.getString(c.getColumnIndex("some_column_name"));
    Log.d(TAG, "onSuggestionClick: position: " + position + " suggestion: " + suggestion);
    return true;
}

另外一个细节，我的SuggestionCursorAdapter扩展了CursorAdaptor并覆盖了以下方法以防止： java.lang.IllegalStateException：尝试重新打开已关闭的对象：SQLiteQuery

@Override
public void changeCursor(Cursor newCursor) {
    newCursor.close();
}

锻炼是痛苦的，所以希望它可以帮助别人！

Answer 2

初始化搜索视图

SearchView searchView = findViewById(R.id.viewSearch);

在0个文本上进行searchview搜索，首先显示最近的项目

AutoCompleteTextView autoCompleteTextView =  
searchView.findViewById(androidx.appcompat.R.id.search_src_text);
    autoCompleteTextView.setThreshold(0);

在searchView.setOnQueryTextFocusChangeListener上调用适配器

 searchView.setOnQueryTextFocusChangeListener(new View.OnFocusChangeListener() {
        @Override
        public void onFocusChange(View view, boolean b) {
            Cursor cursor = database.getSearchValue();
            Log.d("qqqqq", "onQuery: " + cursor.getCount());
            if (cursor.getCount() != 0) {
                String[] columns = new String[]{SuggestionSearchDatabase.FIELD_SEARCH};
                for (String data : new ArrayList<>(Arrays.asList(columns))) {
                    Log.i("dataCheck", "onClick: " + data);
                }
                Log.d("sss", "onClick: " + columns.length);
                int[] columnTextId = new int[]{android.R.id.text1};


                CursorSearchAdapter searchAdapter = new CursorSearchAdapter(getBaseContext(), R.layout.view_searchview_layout, cursor, columns, columnTextId, 0);
                searchView.setSuggestionsAdapter(searchAdapter);
            }
        }
    });

显示空SearchView的建议

2 个答案: