android – 在Fragment中添加SearchView

尝试在操作栏中包含搜索查看.为此,我做了以下事情：

在菜单文件夹中创建了MenuSearch.xml,如下所示：

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android">
   <item
    android:id="@+id/action_search"
    android:actionViewClass="Android.Support.V7.Widget.SearchView"
    android:icon="@android:drawable/ic_menu_search"
    android:showAsAction="always"
    android:title="Search"/>

</menu>

包含片段中的OnCreateOptionsMenu方法：

public override void OnCreateOptionsMenu(IMenu menu, MenuInflater inflater)
    {
        inflater.Inflate(Resource.Menu.MenuSearch, menu);
        base.OnCreateOptionsMenu(menu, inflater);
        var searchManager = (SearchManager) this.Activity.GetSystemService(Context.SearchService);
        searchView = (SearchView) (menu.FindItem(Resource.Id.action_search).ActionView);
        searchView.SetSearchableInfo(searchManager.GetSearchableInfo(Activity.ComponentName));

    }

我设置了HasOptionsMenu = true;在片段的oncreate.

使用上面的代码,我在searchView.SetSearchableInfo …行中获得空指针.不知道为什么会发生这种情况,尽管一切似乎都是正确的.

基于解决类似问题的一些建议,我还尝试了searchview的以下选项.

        var item = menu.FindItem (Resource.Id.action_search);
        var searchItem = MenuItemCompat.GetActionView(item);
        searchView = searchItem.JavaCast<Android.Support.V7.Widget.SearchView>();
        searchView.SetSearchableInfo(searchManager.GetSearchableInfo(Activity.ComponentName));

但同样,我将searchView视为null.

现在我已经尝试了可能的选项,我对于为什么searchview变为null无能为力.

任何帮助深表感谢.

解决方法:

将MenuSearch.xml更改为

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto">
    <item android:id="@+id/action_search"
        android:title="@string/app_name"
        android:icon="@drawable/ic_action_search"
        app:showAsAction="collapseActionView|ifRoom"
         />
</menu>

并在您的片段中添加searchView.setOnQueryTextListener

@Override
    public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
        super.onCreateOptionsMenu(menu, inflater);
        menu.clear();
        inflater.inflate(R.menu.search_option_menu, menu);
        MenuItem item = menu.findItem(R.id.action_search);
        SearchView searchView = new SearchView(((MainActivity) mContext).getSupportActionBar().getThemedContext());
        MenuItemCompat.setShowAsAction(item, MenuItemCompat.SHOW_AS_ACTION_COLLAPSE_ACTION_VIEW | MenuItemCompat.SHOW_AS_ACTION_IF_ROOM);
        MenuItemCompat.setActionView(item, searchView);
        searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
            @Override
            public boolean onQueryTextSubmit(String query) {
                return false;
            }
            @Override
            public boolean onQueryTextChange(String newText) {
                return false;
            }
        });
        searchView.setOnClickListener(new View.OnClickListener() {
                                          @Override
                                          public void onClick(View v) {

                                          }
                                      }
        );
    }

标签：android,xamarin,searchview
来源： https://codeday.me/bug/20191004/1853073.html