sheishuoAPP/app/res/layout/login_and_reg_layout.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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:fitsSystemWindows="true"
    tools:context="com.sheishuo.app.login.LoginAndRegActivity">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical">

        <ImageView
            android:id="@+id/activity_login_an_reg_logo"
            android:layout_width="match_parent"
            android:layout_height="100dp"
            android:layout_marginEnd="8dp"
            android:layout_marginLeft="8dp"
            android:layout_marginRight="8dp"
            android:layout_marginStart="8dp"
            android:layout_marginTop="64dp"
            app:layout_constraintLeft_toLeftOf="parent"
            app:layout_constraintRight_toRightOf="parent"
            app:layout_constraintTop_toTopOf="parent"
            app:srcCompat="@drawable/logo" />

        <TextView
            android:id="@+id/tv_app_name"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginEnd="8dp"
            android:layout_marginLeft="8dp"
            android:layout_marginRight="8dp"
            android:layout_marginStart="8dp"
            android:layout_marginTop="8dp"
            android:text="SHUI SHUO"
            android:textAlignment="center"
            android:typeface="sans"
            app:layout_constraintLeft_toLeftOf="@+id/activity_login_an_reg_logo"
            app:layout_constraintRight_toRightOf="@+id/activity_login_an_reg_logo"
            app:layout_constraintTop_toBottomOf="@+id/activity_login_an_reg_logo" />

        <Button
            android:id="@+id/btn_login"
            style="@style/NormalBtnStyle"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginLeft="20dp"
            android:layout_marginRight="20dp"
            android:layout_marginTop="56dp"
            android:text="登录"
            app:layout_constraintLeft_toLeftOf="@+id/tv_app_name"
            app:layout_constraintRight_toRightOf="@+id/tv_app_name"
            app:layout_constraintTop_toBottomOf="@+id/tv_app_name" />

        <Button
            android:id="@+id/btn_register"
            style="@style/NormalBtnStyle"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginLeft="20dp"
            android:layout_marginRight="20dp"
            android:layout_marginTop="25dp"
            android:text="注册"
            app:layout_constraintLeft_toLeftOf="@+id/btn_login"
            app:layout_constraintRight_toRightOf="@+id/btn_login"
            app:layout_constraintTop_toBottomOf="@+id/btn_login" />
    </LinearLayout>

    <RelativeLayout
        android:id="@+id/intro_layout"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="@color/GreyWhite"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent">

        <android.support.v4.view.ViewPager
            android:id="@+id/view_pager"
            android:layout_width="match_parent"
            android:layout_height="match_parent">

        </android.support.v4.view.ViewPager>

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:gravity="right"
            android:orientation="horizontal"
            android:paddingRight="5dp"
            android:paddingTop="5dp">

            <Button
                android:id="@+id/skip_btn"
                android:layout_width="60dp"
                android:layout_height="40dp"
                android:layout_weight="0"
                android:text="跳过"
                android:textColor="@color/white" />

        </LinearLayout>

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:gravity="bottom"
            android:orientation="horizontal">

            <Button
                android:id="@+id/start_btn"
                android:layout_width="match_parent"
                android:layout_height="60dp"
                android:layout_marginBottom="15dp"
                android:background="@null"
                android:elevation="11dp" />
        </LinearLayout>

    </RelativeLayout>


</RelativeLayout>