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I am using the Android SDK 2.2.3. I am following a book on programming Android. The code is: < xmlns:android="" xmlns:app="" xmlns:tools="" android:id="@+id/activity_main" android:layout_width="match_parent" ...

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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">...

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I want to make a layout that lets me scroll down using constraint layout, but I don’t know how to go about it. Should the ScrollView be the parent of the ConstraintLayout like this? <?xml version="1.0" encoding="utf-8"?><ScrollView xmlns:android="" xmlns:app="" ...