AndroidManifest.xml

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.yourcompany.complexLayout">

    <uses-permission android:name="android.permission.INTERNET"/>

    <application android:name="io.flutter.app.FlutterApplication" android:label="complex_layout" android:icon="@mipmap/ic_launcher">
        <activity android:name="io.flutter.app.FlutterActivity"
                  android:launchMode="singleTop"
                  android:theme="@android:style/Theme.Black.NoTitleBar"
                  android:configChanges="orientation|keyboardHidden|keyboard|screenSize|locale|layoutDirection|fontScale|screenLayout|density"
                  android:hardwareAccelerated="true"
                  android:windowSoftInputMode="adjustResize">
            <intent-filter>
                <action android:name="android.intent.action.MAIN"/>
                <category android:name="android.intent.category.LAUNCHER"/>
            </intent-filter>
        </activity>
    </application>
</manifest>