1.
//noinspection GradleCompatible
implementation 'com.android.support:design:26.1.0'
2.MainAc
<?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:orientation="vertical"
tools:context="com.as.app2.MainActivity">
<TextView
android:background="#f00"
android:layout_width="match_parent"
android:layout_height="300dp"
android:text="Hello World!"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<include layout="@layout/content"/>
</android.support.design.widget.CoordinatorLayout>
2.content
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="@+id/bottom_sheet"
android:layout_width="match_parent"
android:layout_height="340dp"
android:background="#ff0"
android:orientation="vertical"
app:behavior_hideable="false"
android:layout_marginTop="10dp"
app:behavior_peekHeight="80dp"
app:layout_behavior="android.support.design.widget.BottomSheetBehavior">
<TextView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:text="bottom_sheet_content"
android:textColor="@android:color/white" />
</LinearLayout>