Android 导航抽屉旋转错误

在具有NavigationDrawer的“我的活动”中进行旋转后，

onRestoreInstanceState

Caused by: java.lang.IllegalStateException: setSelectedNavigationIndex not valid for current navigation mode
            at android.support.v7.internal.app.WindowDecorActionBar.setSelectedNavigationItem(WindowDecorActionBar.java:420)
            at ir.parsdroid.telegrameducation.Tools.enhanced.onRestoreInstanceState(enhanced.java:118)

我的代码：

@Override
    public void onSaveInstanceState(Bundle outState) {
        // Serialize the current dropdown position.
        outState.putInt(STATE_SELECTED_NAVIGATION_ITEM,
                getSupportActionBar().getSelectedNavigationIndex());
    }

    @Override
    public void onRestoreInstanceState(Bundle savedInstanceState) {
        // Restore the previously serialized current dropdown position.
        if (savedInstanceState.containsKey(STATE_SELECTED_NAVIGATION_ITEM)) {
            getSupportActionBar().setSelectedNavigationItem(
                    savedInstanceState.getInt(STATE_SELECTED_NAVIGATION_ITEM));
        }
    }

我认为这里的逻辑是正确的，但我不知道如何将其用于导航抽屉：

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也许您忘记在onCreate（）中调用setNavigationMode了？api 21不推荐使用setSelectedNavigationItem和setSelectedNavigationItem。在onCreate（）中调用setNavigationMode或不调用任何内容没有区别。请看我的编辑。