android – 显示空SearchView的建议

概述我的 *** 作栏中有一个SearchView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条件. 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小部件时,一旦打开,第二次点击搜索小部件.为此,我使用OnQueryTextListener,如下所示： class SearchT 我的 *** 作栏中有一个SearchVIEw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条件.

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小部件时,一旦打开,第二次点击搜索小部件.为此,我使用OnqueryTextListener,如下所示：

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d出建议,而不是像现在那样需要第二次点击.我没有运气这样做.

我甚至尝试手动查找SearchVIEw的autoCompleteTextVIEw并在SearchVIEw获得焦点时调用showDropDown()(见下文),但是也没有显示下拉列表.

mSearchVIEw.setonqueryTextFocuschangelistener(new OnFocuschangelistener() {    @OverrIDe    public voID onFocusChange(VIEw v,boolean hasFocus) {        if (hasFocus) {            int autoCompleteID = mContext.getResources().getIDentifIEr("androID:ID/search_src_text",null,null);            if (autoCompleteID == 0) {                // We won't be able to find the vIEw. Give up.                return;            }            autoCompleteTextVIEw autoCompleteVIEw = (autoCompleteTextVIEw) mSearchVIEw.findVIEwByID(autoCompleteID);            if (autoCompleteVIEw != null) {                autoCompleteVIEw.showDropDown();            }        }    }});

如何在打开搜索小部件时创建搜索建议下拉列表？

解决方法 有可能的.我正在使用compat v7 SearchVIEw和Cursor Loaders来查询Activity生命周期.

// 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 querIEsSuggestionCursorAdapter suggestionCursorAdapter = new SuggestionCursorAdapter(getContext(),0);searchVIEw.setSuggestionsAdapter(suggestionAdapter);

以下是侦听器的实现：

@OverrIDepublic 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,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;}@OverrIDepublic boolean onqueryTextsubmit(String query) {    return true;}@OverrIDepublic boolean onClose() {    return false;}@OverrIDepublic boolean onSuggestionSelect(int position) {    return false;}@OverrIDepublic 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：尝试重新打开已经关闭的对象：sqlitequery

@OverrIDepublic voID changeCursor(Cursor newCursor) {    newCursor.close();}

锻炼是痛苦所以希望它可以帮助别人！

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