android：从纵向模式转到横向模式时按钮未居中

Question

I have an ImageButton in relative layout with following setup:

<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:background="#000032">
    <ImageButton
    android:id="@+id/button"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_centerHorizontal="true"
    android:layout_centerVertical="true"
    android:background="@null"
    android:contentDescription="button"
    android:scaleType="fitCenter"
    android:src="@drawable/buttonImage" />
</RelativeLayout>

It's in both layout and layout-land file.

The button is centered in landscape mode correctly when app started as landscape mode, kept centered when turn the device to portrait mode.

The button is centered in portrait mode correctly when app started as portrait mode, but not centered anymore when turn the device to landscape mode. Not sure why?

Answer 1

add

android:configChanges="orientation"

in activity used in your androidmanifest.xml file
It should work
https://developer.android.com/guide/topics/manifest/activity-element.html#config