In the below example I have created login page layout. Here I have used first Main LinearLayout all attributes design with in Main LinearLayout. Then I have used ScollView for scrolling page up and down and all attributes like Logo image, textview, editview, button etc divided in diffrent LinearLayout. See the below layout code it will clearly described you to create Login Screen Design.

<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"
    tools:context=".LoginActivity"
    android:background="@drawable/login_bg"
    android:orientation="vertical">

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

        <ImageView
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:id="@+id/ivLogo"
            android:src="@drawable/logo"
            android:layout_gravity="center_horizontal"
            android:layout_marginLeft="35dp"
            android:layout_marginRight="35dp"/>
            <LinearLayout
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:id="@+id/textFields"
                android:layout_gravity="center_horizontal"
                android:orientation="vertical"
                android:layout_marginTop="100dp">

              <TextView
                  android:id="@+id/tvLogin"
                  android:layout_width="wrap_content"
                  android:layout_height="wrap_content"
                  android:layout_gravity="center_horizontal"
                  android:textSize="40dp"
                  android:text="@string/login"
                  android:layout_marginTop="75dp"/>
                <LinearLayout
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:layout_gravity="center_horizontal"
                    android:orientation="vertical"
                    android:layout_marginTop="10dp"
                    android:layout_marginLeft="35dp"
                    android:layout_marginRight="35dp">
                    <RelativeLayout
                        android:layout_width="match_parent"
                        android:layout_height="wrap_content"
                         android:id="@+id/userNmae">



                        <ImageView
                            android:id="@+id/ivName"
                            android:layout_width="wrap_content"
                            android:layout_height="match_parent"
                            android:src="@drawable/name_ic"
                        android:paddingTop="4dp"/>
                        <EditText
                            android:layout_width="match_parent"
                            android:layout_height="match_parent"
                            android:layout_toRightOf="@+id/ivName"
                            android:id="@+id/editName"
                            android:hint="User Name"
                            android:focusable="true"
                            android:textColorHighlight="#ff7eff15"/>


                    </RelativeLayout>

                    <RelativeLayout
                        android:layout_width="match_parent"
                        android:layout_height="wrap_content"
                        android:orientation="horizontal"
                        android:layout_marginTop="8dp"
                        android:id="@+id/userPass">

                        <ImageView
                            android:id="@+id/ivPass"
                            android:layout_width="wrap_content"
                            android:layout_height="match_parent"
                            android:src="@drawable/password_key"
                            android:paddingTop="9dp"/>

                        <EditText

                            android:layout_width="match_parent"
                            android:layout_height="match_parent"
                            android:layout_toRightOf="@+id/ivPass"
                            android:id="@+id/editPass"
                            android:hint="Password"
                            android:focusable="true"/>

                    </RelativeLayout>




                </LinearLayout>



                <LinearLayout
                    android:id="@+id/OtherFields"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:layout_marginTop="20dp"
                    android:layout_marginLeft="20dp"
                    android:layout_marginRight="20dp"
                    android:weightSum="2"
                    android:orientation="horizontal">

                    <RelativeLayout
                        android:orientation="vertical"
                        android:id="@+id/rlRememberCheck"
                        android:layout_width="0dp"
                        android:layout_height="wrap_content"
                        android:layout_weight="1"
                        android:layout_alignParentRight="true">

                        <ImageView
                            android:id="@+id/chck"
                            android:src="@drawable/tick"
                            android:layout_width="wrap_content"
                            android:layout_height="wrap_content"
                            android:layout_centerVertical="true" />

                        <TextView
                            android:id="@+id/remeber"
                            android:layout_width="wrap_content"
                            android:layout_height="wrap_content"
                            android:paddingLeft="10dp"
                            android:textSize="20dp"
                            android:text="@string/remember_me"
                            android:layout_toRightOf="@+id/chck"
                            android:layout_centerVertical="true" />

                    </RelativeLayout>

                    <RelativeLayout
                        android:layout_width="0dp"
                        android:layout_height="wrap_content"
                        android:layout_weight="1"
                        android:layout_gravity="center_vertical">

                        <TextView
                            android:id="@+id/tvForgotPassword"
                            android:layout_width="wrap_content"
                            android:textSize="20dp"
                            android:layout_height="wrap_content"
                            android:layout_centerVertical="true"
                            android:text="@string/forgot_password" />

                    </RelativeLayout>


                </LinearLayout>
                <LinearLayout
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:orientation="vertical"
                    android:id="@+id/btn_Login">

                    <ImageView
                        android:layout_width="match_parent"
                        android:layout_height="wrap_content"
                        android:id="@+id/ivLogin"
                        android:scaleType="fitXY"
                        android:layout_gravity="center_horizontal"
                        android:src="@drawable/login_btn"
                        android:layout_marginLeft="35dp"
                        android:layout_marginRight="35dp"
                        android:layout_marginTop="10dp"/>


                </LinearLayout>
                <LinearLayout
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:orientation="vertical"
                    android:id="@+id/btn_Facebook">

                    <ImageView
                        android:layout_width="match_parent"
                        android:layout_height="wrap_content"
                        android:id="@+id/ivFacebook"
                        android:scaleType="fitXY"
                        android:layout_gravity="center_horizontal"
                        android:src="@drawable/fb_btn"
                        android:layout_marginLeft="35dp"
                        android:layout_marginRight="35dp"
                        android:layout_marginTop="10dp"/>


                </LinearLayout>
                <LinearLayout
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:orientation="horizontal"
                    android:id="@+id/btn_register">

                    <ImageView
                        android:layout_width="match_parent"
                        android:layout_height="wrap_content"

                        android:src="@drawable/register_here"
                        android:id="@+id/ivRegister" />

                    </LinearLayout>

                </LinearLayout>
        </LinearLayout>
        </ScrollView>
    </LinearLayout>