java 如何在扩展 ListActivity 的 Activity 中使用 onCreateOptionsMenu()
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How to use onCreateOptionsMenu() in Activity Which Extended ListActivity
提问by Mehmet
I have a problem about my android app project.
我的 android 应用项目有问题。
I have a MainActivity which is below:
我有一个 MainActivity 如下：
public class MainActivity extends ListActivity {
private NotesDataSource datasource;
List<NoteItem> notesList;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
datasource = new NotesDataSource(this);
refreshDisplay();
}
private void refreshDisplay() {
notesList = datasource.findAll();
ArrayAdapter<NoteItem> adapter = new ArrayAdapter<NoteItem>(this, R.layout.list_item_layout, notesList);
setListAdapter(adapter);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
}
And Also I have a menu_main.xml:
而且我还有一个 menu_main.xml：
<menu xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools" tools:context=".MainActivity">
<item android:id="@+id/action_create"
android:title="@string/action_create"
android:orderInCategory="100"
app:showAsAction="always|withText"
android:icon="@drawable/create_note"/>
</menu>
At this point the problem is starting. I have changed my superclass from ActionBarActivityto ListActivitythen, when I run my app on my device, I can not see my create icon (and the top menu which include app name). What's wrong? And idea?
在这一点上，问题开始了。我已将我的超类从ActionBarActivity更改为ListActivity然后，当我在我的设备上运行我的应用程序时，我看不到我的创建图标（以及包含应用程序名称的顶部菜单）。怎么了？和想法？
(Btw I am using Android Studio Ide)
（顺便说一句，我使用的是 Android Studio Ide）
采纳答案by CommonsWare
Your theme is probably still based on Theme.AppCompat. If you want to use Theme.AppCompat, you have to inherit from ActionBarActivity. If you want to use ListActivity, you cannot use Theme.AppCompat.
您的主题可能仍然基于Theme.AppCompat. 如果你想使用Theme.AppCompat，你必须继承自ActionBarActivity. 如果你想使用ListActivity，你不能使用Theme.AppCompat。
Note that you do not need to use ListActivityto have a ListViewin an activity. Here is a sample projectdemonstrating the use of Theme.AppCompatwith an ActionBarActivityand a ListView. Here is another sample project, the same as the previous one, except that I apply custom tints to the action bar.
请注意，您不需要使用ListActivity有ListView一个活动。这是一个示例项目，演示了Theme.AppCompatwith anActionBarActivity和 a 的使用ListView。这是另一个示例项目，与上一个相同，不同之处在于我将自定义色调应用于操作栏。
