uber_layout.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=".MainActivity">

        <ImageView
            android:id="@+id/bg_img"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:src="@drawable/bro_cab"

            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent" />


        <android.support.constraint.ConstraintLayout
            android:id="@+id/layout"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_marginBottom="8dp"
            app:layout_constraintBottom_toBottomOf="@+id/bg_img"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintHorizontal_bias="0.0"
            app:layout_constraintStart_toStartOf="parent">

            <TextView
                android:id="@+id/title_tv"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginLeft="16dp"
                android:layout_marginBottom="155dp"
                android:text="Connecting with BroCabs"
                android:textColor="@android:color/black"
                android:textSize="20sp"
                app:layout_constraintBottom_toBottomOf="parent"
                app:layout_constraintStart_toStartOf="parent" />

            <android.support.design.widget.TextInputLayout
                android:layout_width="0dp"
                android:layout_height="58dp"
                android:layout_marginLeft="16dp"
                android:layout_marginTop="8dp"
                android:layout_marginRight="32dp"
                app:layout_constraintEnd_toEndOf="parent"
                app:layout_constraintStart_toStartOf="parent"
                app:layout_constraintTop_toBottomOf="@+id/title_tv">

                <android.support.design.widget.TextInputEditText
                    android:id="@+id/mob_et"
                    android:layout_width="match_parent"
                    android:maxLength="10"
                    android:layout_height="wrap_content"
                    android:hint="Enter your mobile number"
                    android:inputType="phone" />
            </android.support.design.widget.TextInputLayout>

            <android.support.design.widget.FloatingActionButton
                android:id="@+id/registerFab"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginRight="24dp"
                android:layout_marginBottom="24dp"
                android:clickable="true"
                app:backgroundTint="#c46a28"
                app:layout_constraintBottom_toBottomOf="parent"
                app:layout_constraintEnd_toEndOf="parent"
                android:src="@drawable/ic_next" />

        </android.support.constraint.ConstraintLayout>
</android.support.constraint.ConstraintLayout>