纵向固定活动变为横向，而从横向活动切换回纵向

Question

我有MainActivity，它在清单中具有固定的方向

<activity 
    android:name=".MainActivity" 
    android:configChanges="orientation|screenSize" 
    android:screenOrientation="portrait"
    android:launchMode="singleTask">
    <intent-filter>
        <action android:name="android.intent.action.MAIN" />
        <category android:name="android.intent.category.LAUNCHER" />
    </intent-filter>
</activity>

MainActivity.kt

class MainActivity : LifecyclerLoggerActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        findViewById<Button>(R.id.button).setOnClickListener({ startSecondActivity() })
    }

    private fun startSecondActivity() {
        startActivity(Intent(this, SecondActivity::class.java))
    }

    override fun onConfigurationChanged(newConfig: Configuration?) {
        super.onConfigurationChanged(newConfig)

        if (newConfig?.orientation == Configuration.ORIENTATION_PORTRAIT) {
            Log.d("MainActivity", "onConfChanged orientation is portrait" )
        } else if (newConfig?.orientation == Configuration.ORIENTATION_LANDSCAPE) {
            Log.d("MainActivity", "onConfChanged orientation is landscape" )
        }
    }
}

按钮启动SecondActivity，该清单在清单中具有固定的横向方向：

<activity
    android:launchMode="singleTop"
    android:name=".SecondActivity"
    android:configChanges="orientation|screenSize"
    android:screenOrientation="sensorLandscape" />

SecondActivity.kt

class SecondActivity : LifecyclerLoggerActivity(){

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.second_activity)
    }

    override fun onResume() {
        super.onResume()
        Handler().postDelayed({finish()}, 200)
    }
}

“主要活动”和“第二活动”都扩展了LifecyclerLoggerActivity，该活动记录了生命周期方法调用。

SecondActivity的

OnResume方法在200ms之后完成它。然后MainActivity恢复方向更改回纵向。

那是什么问题？

在调用finish（）之后，MainActivity会恢复为L​​ANDSCAPE模式约300 ms，然后将方向更改为纵向，这看起来确实很丑。

MainActivity屏幕：

第二活动屏幕：

从第二个到主要的过渡：

Logcat的日志：

D/LifecycleLogger: On Pause of  MainActivity215908412

D/LifecycleLogger: On Create of SecondActivity123929575

D/LifecycleLogger: On Resume of SecondActivity123929575

D/LifecycleLogger: On Stop of   MainActivity215908412

D/LifecycleLogger: On Pause of  SecondActivity123929575

D/MainActivity: onConfChanged orientation is landscape

D/LifecycleLogger: On Resume of MainActivity215908412

D/MainActivity: onConfChanged orientation is portrait

D/LifecycleLogger: On Stop of   SecondActivity123929575

D/LifecycleLogger: On Destroy of SecondActivity123929575

那么，如果MainActivity的配置固定为纵向，为什么还要以横向模式恢复呢？