A RelativeLayout is a very powerful Layout which is used for custum layout designing of user interface because It gives us the flexibility to position of each view can be specified as relative to sibling elements (such as to the left-of or below another view) or in positions relative to the parent RelativeLayout area (such as aligned to the bottom, left or center).

Just because it allows us to arrange the position of UI element  anywhere we want so it is considered as most flexible layout. For the same good features Relative layout is the most used layout after the Linear Layout in Android.

Positioning UI element /views in Relative Layout

In RelativeLayout we need to specify the position of child views relative to each other or relative to the parent. In case if we didn’t specify the position of child views, by default all child views are positioned to top-left of the layout.

bellow are the some of most useful layout properties available to views in RelativeLayout.

Android Relative Layout Example

1. above : This is used to position the  bottom edge of the given component above the given component ID.

For example, suppose a view with id textview2 is what we want to place above another view with id textview. Below is the code and layout image.

<!-- alignParentTop example -->
<TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Text1 align parent top"
    android:layout_alignParentTop="true"
    android:layout_margin="20dp"
    android:textSize="20sp"
    android:textColor="#000"/>

Example of Relative layout:

<?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"
    tools:context=".MainActivity">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/textview3"
        android:text="sign in"
        android:textAppearance="?android:attr/textAppearanceLarge"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true">
    </TextView>
    <TextView
        android:id="@+id/userName"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginLeft="20dp"
        android:layout_marginTop="110dp"
        android:text="UserName:"
        android:textColor="#000000"
        android:textSize="20sp" />

    <TextView
        android:id="@+id/password"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/userName"
        android:layout_margin="20dp"
        android:text="Password:"
        android:textColor="#000000"
        android:textSize="20sp" />
    <EditText
        android:id="@+id/edt_userName"
        android:layout_width="fill_parent"
        android:layout_height="40dp"
        android:layout_marginLeft="20dp"
        android:layout_marginTop="100dp"
        android:layout_toRightOf="@+id/userName"
        android:hint="User Name" />

    <EditText
        android:layout_width="fill_parent"
        android:layout_height="40dp"
        android:layout_below="@+id/edt_userName"
        android:layout_centerVertical="true"
        android:layout_toRightOf="@+id/password"
        android:hint="Password" />
    <Button
        android:id="@+id/btnLogin"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/password"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="20dp"
        app:backgroundTint="#93180F"
        android:text="Login"
        android:textColor="#ffffff"
        android:textStyle="bold" />
</RelativeLayout>

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<?php
$url="localhost";
$username="searchke_webs";
$password ="webservice@123";
$dbname="searchke_webs";
$connect = mysqli_connect($url,$username,$password,$dbname);
if(!$connect)
{
echo "db not connet".mysqli_connect_error();
}
else{
//echo"DB CONNECT";
}
?>

<?php
require "connect.php";
$name=$_POST["name"];
$mobile=$_POST["mobile"];
$insert="insert into register values ('$name','$mobile')";

$insert_check=mysqli_query($connect,$insert);
if(!$insert_check)
{
echo"insert not done".mysqli_error();
}
else
{
echo"insert done";
}
?>