<?xml version="1.0" encoding="utf-8"?>
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@color/white"
    android:orientation="vertical"
    android:fillViewport="true"
    android:scrollbars="none">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="@color/white"
        android:orientation="vertical">
            <com.luozm.captcha.Captcha
                android:id="@+id/captCha"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                app:src="@mipmap/cat" />
    </LinearLayout>
</ScrollView>