Relative Layout

⇒ Important Attributes for positioning views in the RelativeLayout

As we know, we need to define the position of child views or ViewGroups relative to each other element or relative to the parent. By default position is top-left, if someone forgets to specify the position of child views.

XML attributes	Description
layout_alignParentLeft	It is set “true” to match the left edge of view to the left edge of parent.
layout_alignParentRight	It is set “true” to match the right edge of view to the right edge of parent.
layout_alignParentTop	It is set “true” to match the top edge of view to the top edge of parent.
layout_alignParentBottom	It is set “true” to match the bottom edge of view to the bottom edge of parent.
layout_alignLeft	It accepts another sibling view id and align the view to the left of the specified view id
layout_alignRight	It accepts another sibling view id and align the view to the right of the specified view id.
layout_alignStart	It accepts another sibling view id and align the view to start of the specified view id.
layout_alignEnd	It accepts another sibling view id and align the view to end of specified view id.
layout_centerInParent	When it is set “true”, the view will be aligned to the center of parent.
layout_centerHorizontal	When it is set “true”, the view will be horizontally centre aligned within its parent.
layout_centerVertical	When it is set “true”, the view will be vertically centre aligned within its parent.
layout_toLeftOf	It accepts another sibling view id and places the view left of the specified view id.
layout_toRightOf	It accepts another sibling view id and places the view right of the specified view id.
layout_toStartOf	It accepts another sibling view id and places the view to start of the specified view id.
layout_toEndOf	It accepts another sibling view id and places the view to end of the specified view id.
layout_above	It accepts another sibling view id and places the view above the specified view id.
layout_below	It accepts another sibling view id and places the view below the specified view id.

XML


<?xml version="1.0" encoding="utf-8"?> 
<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"> 
	
	<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_toRightOf="@id/textView1"
		android:layout_marginTop="8dp"/> 
	
	<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_toRightOf="@id/textView2"
		android:layout_marginTop="45dp"/> 

	<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>