zumo_2.0_android/app/src/main/res/layout/activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout
  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"
  android:background="@color/CFFFFFF"
  android:orientation="vertical">

  <android.support.constraint.ConstraintLayout
    android:id="@+id/container_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@color/CFFFFFF"
    android:orientation="vertical"
    >
  </android.support.constraint.ConstraintLayout>
  <!--app:layout_behavior="@string/appbar_scrolling_view_behavior"-->

  <android.support.design.widget.AppBarLayout
    android:id="@+id/layout_app_bar"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:background="@null"
    app:elevation="0dp"
    >

    <android.support.v7.widget.Toolbar
      android:id="@+id/toolbar"
      android:layout_width="match_parent"
      android:layout_height="@dimen/action_bar_height"
      android:minHeight="0dp"
      >
    </android.support.v7.widget.Toolbar>

    <RelativeLayout
      android:id="@+id/layout_app_bar_contents"
      android:layout_width="match_parent"
      android:layout_height="wrap_content"
      android:layout_gravity="bottom"
      android:background="@color/CFFFFFF"
      android:gravity="start">

      <ProgressBar
        android:id="@+id/progress_bar"
        style="?android:attr/progressBarStyleHorizontal"
        android:layout_width="match_parent"
        android:layout_height="4dp"
        android:layout_centerInParent="false"
        android:progressDrawable="@drawable/sign_up_progress"
        tools:progress="50"
        />
    </RelativeLayout>

    <android.support.constraint.ConstraintLayout
      android:id="@+id/layout_category_main_tab"
      android:layout_width="match_parent"
      android:layout_height="wrap_content"
      android:background="@color/CFFFFFF"
      android:visibility="gone"
      tools:visibility="visible"
      >

      <RadioGroup
        android:id="@+id/category_main_tab"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="24dp"
        android:layout_marginBottom="26dp"
        android:orientation="horizontal"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        >

        <RadioButton
          android:id="@+id/tab_first_category"
          android:layout_width="56dp"
          android:layout_height="wrap_content"
          android:layout_marginStart="2dp"
          android:layout_marginEnd="2dp"
          android:background="@null"
          android:button="@null"
          android:drawableTop="@drawable/category_main_first_tab"
          android:drawablePadding="8dp"
          android:lineSpacingExtra="4dp"
          android:text="@string/contents_category1_tab_title"
          android:textAlignment="center"
          android:textColor="@drawable/my_faq_radio_text_selector"
          android:textSize="12dp"
          />

        <RadioButton
          android:id="@+id/tab_second_category"
          android:layout_width="56dp"
          android:layout_height="wrap_content"
          android:layout_marginStart="2dp"
          android:layout_marginEnd="2dp"
          android:background="@null"
          android:button="@null"
          android:drawableTop="@drawable/category_main_second_tab"
          android:drawablePadding="8dp"
          android:lineSpacingExtra="4dp"
          android:text="@string/contents_category2_tab_title"
          android:textAlignment="center"
          android:textColor="@drawable/my_faq_radio_text_selector"
          android:textSize="12dp"
          />

        <RadioButton
          android:id="@+id/tab_third_category"
          android:layout_width="56dp"
          android:layout_height="wrap_content"
          android:layout_marginStart="2dp"
          android:layout_marginEnd="2dp"
          android:background="@null"
          android:button="@null"
          android:drawableTop="@drawable/category_main_third_tab"
          android:drawablePadding="8dp"
          android:lineSpacingExtra="4dp"
          android:text="@string/contents_category3_tab_title"
          android:textAlignment="center"
          android:textColor="@drawable/my_faq_radio_text_selector"
          android:textSize="12dp"
          />

        <RadioButton
          android:id="@+id/tab_fourth_category"
          android:layout_width="56dp"
          android:layout_height="wrap_content"
          android:layout_marginStart="2dp"
          android:layout_marginEnd="2dp"
          android:background="@null"
          android:button="@null"
          android:drawableTop="@drawable/category_main_fourth_tab"
          android:drawablePadding="8dp"
          android:lineSpacingExtra="4dp"
          android:text="@string/contents_category4_tab_title"
          android:textAlignment="center"
          android:textColor="@drawable/my_faq_radio_text_selector"
          android:textSize="12dp"
          />

        <RadioButton
          android:id="@+id/tab_fifth_category"
          android:layout_width="56dp"
          android:layout_height="wrap_content"
          android:layout_marginStart="2dp"
          android:layout_marginEnd="2dp"
          android:background="@null"
          android:button="@null"
          android:drawableTop="@drawable/category_main_fifth_tab"
          android:drawablePadding="8dp"
          android:lineSpacingExtra="4sp"
          android:text="@string/contents_category5_tab_title"
          android:textAlignment="center"
          android:textColor="@drawable/my_faq_radio_text_selector"
          android:textSize="12sp"
          />
      </RadioGroup>

      <View
        android:layout_width="match_parent"
        android:layout_height="1dp"
        android:background="@color/CE5E5E5"
        app:layout_constraintBottom_toBottomOf="parent"
        />
    </android.support.constraint.ConstraintLayout>
  </android.support.design.widget.AppBarLayout>

  <android.support.design.widget.FloatingActionButton
    android:id="@+id/floating_action_button"
    android:layout_width="44dp"
    android:layout_height="44dp"
    android:layout_gravity="bottom|end"
    android:layout_margin="@dimen/fab_margin"
    android:background="@null"
    android:elevation="0dp"
    android:scaleType="center"
    app:elevation="0dp"
    tools:srcCompat="@drawable/icon_floating_inqurebtn"
    />

</android.support.design.widget.CoordinatorLayout>