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error when PreferenceActivity

check this article: https://blog.30sparks.com/preferenceactivity-under-appcompat/ 不過要注意Setting layout .xml 內Toolbar要改: xml version= "1.0" encoding= "utf-8" ?> < LinearLayout xmlns: android = "http://schemas.android.com/apk/res/android" android :layout_width= "match_parent" android :layout_height= "match_parent" android :orientation= "vertical" > < androidx.appcompat.widget.Toolbar android :id= "@+id/action_bar" android :layout_width= "match_parent" android :layout_height= "wrap_content" android :minHeight= "?attr/actionBarSize" /> < FrameLayout android :id= "@+id/content_wrapper" android :layout_width= "match_parent" android :layout_height= "0dp" android :layout_weight= "1" /> </ LinearLayout