activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.example.mengjiaohong.myapplication.MainActivity">

    <ScrollView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content">

        <LinearLayout
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:layout_margin="5dp"
            android:orientation="vertical"
            android:visibility="visible">

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="Hello World!"
                app:layout_constraintBottom_toBottomOf="parent"
                app:layout_constraintLeft_toLeftOf="parent"
                app:layout_constraintRight_toRightOf="parent"
                app:layout_constraintTop_toTopOf="parent" />

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="Camera App"
                android:id="@+id/cameraStatus"/>


            <SeekBar
                android:id="@+id/seek1"
                android:layout_width="fill_parent"
                android:layout_height="wrap_content"
                android:layout_margin="10dp"
                android:progress="20"
                android:secondaryProgress="20"
                android:paddingTop="10dp"
                android:paddingBottom="10dp" />

            <SeekBar
                android:id="@+id/seek2"
                android:layout_width="fill_parent"
                android:layout_height="wrap_content"
                android:layout_margin="10dp"
                android:progress="20"
                android:secondaryProgress="20"
                android:paddingTop="10dp"
                android:paddingBottom="10dp" />

            <TextView
                android:id="@+id/textView01"
                android:text="initial value "
                android:layout_width="wrap_content"
                android:layout_height="wrap_content" />

            <Button
                android:id="@+id/button1"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="Send slider value" />

            <TextView
                android:id="@+id/textView02"
                android:text="nothing from button yet"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                />

            <ScrollView
                android:id="@+id/ScrollView01"
                android:layout_width="wrap_content"
                android:layout_height="250dip">

                <TextView
                    android:id="@+id/textView03"
                    android:text="nothing from usb yet"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:background="@android:color/holo_green_light"
                    />
            </ScrollView>

            <SurfaceView
                android:id="@+id/surfaceview"
                android:layout_width="320dp"
                android:layout_height="200dp" />

            <TextureView
                android:id="@+id/textureview"
                android:layout_width="320dp"
                android:layout_height="200dp" />


        </LinearLayout>
    </ScrollView>


</android.support.constraint.ConstraintLayout>