我有一个简单的活动,选项菜单设置如下所示。我遇到的问题是,在展开和折叠搜索视图后,即使工具栏上有空间,也不会显示app:showAsAction="ifRoom"
的菜单项。另一方面,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?
答案 0 :(得分:3)
将项目设置为可见后,您应该致电invalidateOptionsMenu()。
来自文档:
声明选项菜单已更改,因此应重新创建。该 onCreateOptionsMenu(Menu)方法将在下次需要时调用 待显示。