ScrollView标签要放到最外层，事例：<ScrollViewxmlns:android="http://schemas.android.com/apk/res/android"xmlns:tools="http://schemas.android.com/tools"android:layout_width="match_parent"android:layout_height="match_parent"><LinearLayoutandroid:layout_width="match_parent"android:layout_height="match_parent"android:orientation="vertical"tools:context="com.codingbigcat.unitcmtofeet.MainActivity"><LinearLayout/>