layout_weight_demo

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/sms_linear_layout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_alignParentLeft="true"
    android:layout_alignParentStart="true"
    android:layout_alignParentTop="true"
    android:gravity="center_horizontal"
    android:orientation="vertical">

    <ScrollView
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:orientation="vertical"
            android:weightSum="8">

            <TextView
                android:layout_width="match_parent"
                android:layout_height="0dp"
                android:layout_weight="1"
                android:gravity="center"
                android:text="Id" />

            <EditText
                android:id="@+id/sms_id_sms_pro"
                android:layout_width="match_parent"
                android:layout_height="0dp"
                android:layout_weight="1"
                android:gravity="center" />

            <TextView
                android:layout_width="match_parent"
                android:layout_height="0dp"
                android:layout_weight="1"
                android:gravity="center"
                android:text="Remaning" />

            <EditText
                android:id="@+id/sms_nb_remainning"
                android:layout_width="match_parent"
                android:layout_height="0dp"
                android:layout_weight="1"
                android:gravity="center" />

            <TextView
                android:layout_width="match_parent"
                android:layout_height="0dp"
                android:layout_weight="1"
                android:gravity="center"
                android:text="Sender Name" />


            <EditText
                android:id="@+id/sms_name_sender"
                android:layout_width="match_parent"
                android:layout_height="0dp"
                android:layout_weight="1"
                android:gravity="center"
                android:maxLength="11" />

            <CalendarView
                android:id="@+id/sms_calendar"
                android:layout_width="match_parent"
                android:layout_height="0dp"
                android:layout_weight="1" />

            <TimePicker
                android:id="@+id/sms_time"
                android:layout_width="match_parent"
                android:layout_height="0dp"
                android:layout_weight="1" />
        </LinearLayout>
    </ScrollView>
</LinearLayout>

While using layout_weight the desired width or height should be set to 0dp so that the width or height can be adjusted appropriately