其他选项菜单项在展开的搜索视图折叠后不显示

Question

我有一个简单的 activity 选项菜单设置，代码如下所示。我遇到的问题是，在展开和折叠搜索视图后，带有 app:showAsAction="ifRoom" 的菜单项不会出现，即使工具栏上有空间。另一方面，带有 app:showAsAction="never" 的菜单项会出现。

menu_simple_activity.xml

<?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:icon="@drawable/ic_search_white_24dp"
        android:title="@string/action_search"
        app:actionViewClass="android.support.v7.widget.SearchView"
        app:showAsAction="always|collapseActionView" />
    <item
        android:id="@+id/action_filter"
        android:icon="@drawable/ic_filter_list_white_24dp"
        android:title="@string/action_filter"
        app:showAsAction="ifRoom" />

    <item
        android:id="@+id/action_sort"
        android:icon="@drawable/ic_sort_white_24dp"
        android:title="@string/action_sort"
        app:showAsAction="ifRoom" />

    <item
        android:id="@+id/action_print_all"
        android:icon="@drawable/ic_print_white_24dp"
        android:title="@string/action_print_all"
        app:showAsAction="never" />
</menu>

SimpleActivity.java

public class SimpleActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_simple);
        Toolbar toolbar = findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);

        FloatingActionButton fab = findViewById(R.id.fab);
        fab.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Snackbar.make(view, "Replace with your own action", 
                Snackbar.LENGTH_LONG)
                        .setAction("Action", null).show();
            }
        });
    }

    @Override
    public boolean onCreateOptionsMenu(final Menu menu) {
        getMenuInflater().inflate(R.menu.menu_simple_activity, menu);
        MenuItem searchMenuItem = menu.findItem(R.id.action_search);
        final MenuItem filterMenuItem = menu.findItem(R.id.action_filter);
        final MenuItem sortMenuItem = menu.findItem(R.id.action_sort);
        final MenuItem printAllMenuItem = 
        menu.findItem(R.id.action_print_all);

        searchMenuItem.setOnActionExpandListener(new 
        MenuItem.OnActionExpandListener() {
            @Override
            public boolean onMenuItemActionExpand(MenuItem item) {
                filterMenuItem.setVisible(false);
                sortMenuItem.setVisible(false);
                printAllMenuItem.setVisible(false);
                return true;
            }

            @Override
            public boolean onMenuItemActionCollapse(MenuItem item) {
                filterMenuItem.setVisible(true);
                sortMenuItem.setVisible(true);
                printAllMenuItem.setVisible(true);
                return true;
            }
        });
        return true;
    }
}

我该如何解决？

Answer 1

您应该在将项目设置为可见后调用 invalidateOptionsMenu()。

来自文档：

Declare that the options menu has changed, so should be recreated. The onCreateOptionsMenu(Menu) method will be called the next time it needs to be displayed.

其他选项菜单项在展开的搜索视图折叠后不显示

Other options menu items not showing after expanded searchview is collapsed

android

android-optionsmenu

searchview