How to Declare RelativeLayout in XML file?

Important Attributes for Positioning Views in the RelativeLayout

First of all, we should declare the RelativeLayout in layout file using the below code.

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingLeft="10dp"
    android:paddingRight="10dp">

    // Add other view or ViewGroup here
</RelativeLayout>

RelativeLayout in activity_main.xml file

Following is the code for RelativeLayout in xml file.

activity_main.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:paddingLeft="10dp"
    android:paddingRight="10dp"
    tools:context=".MainActivity">

    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:text="First name:"
        android:layout_marginTop="20dp"
        android:textSize="20dp"/>

    <EditText
        android:id="@+id/editText1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="8dp"
        android:layout_toRightOf="@id/textView1"
        android:elegantTextHeight="true"
        android:hint="Enter First Name"/>

    <TextView
        android:id="@+id/textView2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_below="@+id/textView1"
        android:layout_marginTop="10dp"
        android:text="Last name:"
        android:textSize="20dp"/>

    <EditText
        android:id="@+id/editText2"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="45dp"
        android:layout_toRightOf="@id/textView2"
        android:elegantTextHeight="true"
        android:hint="Enter Last Name"/>

    <Button
        android:id="@+id/btn4"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_below="@id/textView2"
        android:layout_marginTop="20dp"
        android:text="Submit" />

</RelativeLayout>

MainActivity.kt file

When we have created layout, we need to load the XML layout resource from our activity onCreate() callback method and access the UI element form the XML using findViewById.

MainActivity.kt

package com.w3wiki.myfirstKotlinapp

import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle


class MainActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        // below access the UI elements

    }
}

RelativeLayout Output:

We can run the application using the Android Virtual Device(AVD) to get the output of the above code.

Click Here to Learn More about Android Kotlin Application

Android RelativeLayout in Kotlin

Android RelativeLayout is a ViewGroup subclass, used to specify the position of child View elements relative to each other like (A to the right of B) or relative to the parent (fixed to the top of the parent). Instead of using LinearLayout, we have to use RelativeLayout to design the user interface and keep our hierarchy flat because it improves the performance of the application.

Tags:

#Android-View #Kotlin Android #Android