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I make some simple app for test using ConstraintLayout. But I have some problem. Here is my code activity_main.xml <?xml version="1.0" encoding="utf-8"?> <layout xmlns:android="" xmlns:app="" xmlns:tools="">< android:layout_width="match_parent" android:layout_height="match_parent" tools:context="com.example.user.myapplication.activity.MainActivity">...