YJ-POS/ZTHandPOS/app/src/main/res/layout/activity_scan.xml

<LinearLayout xmlns: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"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:orientation="vertical"     
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:padding="@dimen/device_padding" >
        <TextView 
            android:layout_height="0dp"
            android:layout_weight="8"
            android:id="@+id/scan_text"
            android:layout_marginBottom="3dp"
            android:text="@string/test_scan"
            android:layout_width="match_parent"
            style="@style/txtStyle"/>
       <HorizontalScrollView
            android:layout_width="match_parent"
            android:layout_height="0dp"
            android:layout_weight="1.5" >

           <LinearLayout
               android:layout_width="wrap_content"
               android:layout_height="fill_parent"
               android:gravity="center_vertical"
               android:orientation="horizontal"
               android:scrollbars="horizontal">

               <Button
                   android:id="@+id/scan_front"
                   style="@style/btn_list_style"
                   android:layout_width="wrap_content"
                   android:layout_height="wrap_content"
                   android:text="@string/test_scan_front" />

               <Button
                   android:id="@+id/scan_back"
                   style="@style/btn_list_style"
                   android:layout_width="wrap_content"
                   android:layout_height="wrap_content"
                   android:layout_marginLeft="@dimen/btn_padding"
                   android:text="@string/test_scan_back" />

               <Button
                   android:id="@+id/scan_clear"
                   style="@style/btn_list_style"
                   android:layout_width="wrap_content"
                   android:layout_height="wrap_content"
                   android:layout_marginLeft="@dimen/btn_padding"
                   android:text="@string/btn_clear_content" />
           </LinearLayout>
        </HorizontalScrollView>
     </LinearLayout>