Android 如果使用带有自定义视图的actionbar，则在配置更改时不会调用活动的onCreate

我在正在使用的actionbar中添加了一个customview。在设备旋转之前，一切都很正常。不调用活动的onCreate，随后在需要actionbar的customview的片段中存在NPE

OTOH，如果我注释掉活动中所有与actionbar相关的代码。一切都很好，但没有定制的actionbar。该活动的onCreate是：

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);  // LINE 51
    Crashlytics.start(this);
    Log.d(TAG, "onCreate");
    setContentView(R.layout.homescreen_activity);

    actionBarCustomView = LayoutInflater.from(this).inflate(R.layout.homescreen_actionbar, null);
    ActionBar.LayoutParams params = new ActionBar.LayoutParams(ActionBar.LayoutParams.MATCH_PARENT,
            ActionBar.LayoutParams.MATCH_PARENT, Gravity.CENTER);

    getSupportActionBar().setDisplayOptions(ActionBar.DISPLAY_SHOW_CUSTOM);
    getSupportActionBar().setCustomView(actionBarCustomView, params);

    Log.d(TAG, "Activity actionbar NULL ? " + (null == getSupportActionBar()));
    Log.d(TAG, "Activity customview NULL ? " + (null == actionBarCustomView));

    settingsFromActionbar = (ImageButton) actionBarCustomView.findViewById(R.id.settingsFromActionBar);
    settingsFromActionbar.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {
            Toast.makeText(HomeScreenActivity.this, "Touched Settings", Toast.LENGTH_SHORT).show();
            Intent settingIntent = new Intent(HomeScreenActivity.this, SettingsActivity.class);
            startActivity(settingIntent);

        }
    });

    fm = getSupportFragmentManager();
    homeScreenFragment = fm.findFragmentByTag("homeScreen");

    if (homeScreenFragment == null) {
        homeScreenFragment = new HomeScreenFragment();
        getSupportFragmentManager().beginTransaction()
                .add(R.id.homescreen_container, homeScreenFragment, "homeScreen").commit();
    }
}

}

编辑：我的mainfest文件中没有android:configChanges-

<!-- HOME SCREEN ACTIVITY -->
    <activity
        android:name="com.example.try_masterdetail.homescreen.HomeScreenActivity"
        android:label="@string/app_name"
        android:theme="@style/TrasnparentActionBarTheme" >
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>

家庭破碎-

    @Override
public void onAttach(Activity activity) {
    super.onAttach(activity);
    try {
        activityCallback = (Callbacks) activity;
    } catch (ClassCastException e) {
        throw new ClassCastException(activity.toString() + " must implement ToolbarListener");
    }

    Log.d(TAG, "fragment activity NULL ? " + (null == activity));  // This comes as false
    actionBar = ((ActionBarActivity) activity).getSupportActionBar();
    Log.d(TAG, "fragment actionbar NULL ? " + (null == actionBar)); // This comes as true
    actionBarCustomView = actionBar.getCustomView(); //LINE 94

}

---

显然，当设备旋转时，在活动onCreate之前调用片段的onAttach。因此，当程序试图在Fragment的onAttach中获取actionbar时，actionbar从未形成

---

更多-

发布logcat错误将对我们有所帮助。帮助你：@soundsdangerious补充道。对所需的行也进行评论。看看这个：@SoundsDangerous嗨，我试过上面的方法。在设置自定义视图后，将setContentView移动到，但它没有移动work@SoundsDangerous找到了答案。这么愚蠢的事。

    @Override
public void onAttach(Activity activity) {
    super.onAttach(activity);
    try {
        activityCallback = (Callbacks) activity;
    } catch (ClassCastException e) {
        throw new ClassCastException(activity.toString() + " must implement ToolbarListener");
    }

    Log.d(TAG, "fragment activity NULL ? " + (null == activity));  // This comes as false
    actionBar = ((ActionBarActivity) activity).getSupportActionBar();
    Log.d(TAG, "fragment actionbar NULL ? " + (null == actionBar)); // This comes as true
    actionBarCustomView = actionBar.getCustomView(); //LINE 94

}