android - android - getMenuInflater 导致崩溃

Question

我运行以下代码：

   public class MainActivity extends ActionBarActivity  
    {
ExpandableListAdapter listAdapter;
ExpandableListView expListView;
List<String> listDataHeader;
HashMap<String, List<String>> listDataChild;
public static final String PREFS_NAME = "MyPrefsFile";
static SharedPreferences mPrefs;
SharedPreferences.Editor shPrefEditor;
public int BlackBackground=0, SleepScreen=1;
static MenuInflater inflater;
public ActionBar ab;

@Override
protected void onCreate(Bundle savedInstanceState) 
{
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);  

    mPrefs = getSharedPreferences(PREFS_NAME, 0);
    shPrefEditor = mPrefs.edit();
    BlackBackground = mPrefs.getInt("BlackBackground", 0);
    inflater = getMenuInflater();
...

模拟器在以下情况下崩溃（NullPointerException）：

inflater = getMenuInflater();

有谁知道为什么？我该如何解决？

Answer 1

为了解决这个问题，getMenuInflater() 需要从 onCreate 移动到 onCreateOptionsMenu()。如果从 onCreate() 调用 getMenuInflater() 似乎有些设备（例如 Nexus 5）会导致崩溃，此外 onCreateOptionsMenu() 确实是正确的位置。