背景色を指定していたときに foreground よく利用してたけど、Viewで使えるようになったのはAPI23から。それ以下で使いたいときは FrameLayout で使おう
android:foreground="?android:attr/selectableItemBackground"
More than 5 years have passed since last update.
Attribute android:foreground has no effect on API levels lower than 23 (current min is 21)
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Last updated at Posted at 2019-02-13
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