RelativeLayout Properties

Positioning Views in RelativeLayout 

XML Attributes	Description
layout_alignParentTop	Accepts boolean value. If specified, the widget will be docked to the top of RelativeLayout.
layout_alignParentBottom	Accepts boolean value. If specified, the widget will be docked to the bottom of RelativeLayout.
layout_alignParentLeft	Accepts boolean value. If specified, the widget will be docked to the left edge of RelativeLayout.
layout_alignParentRight	Accepts boolean value. If specified, the widget will be docked to the right edge of RelativeLayout.
layout_centerInParent	Accepts boolean value. If specified, the widget will be aligned to center of RelativeLayout.
layout_centerHorizontal	Accepts boolean value. If specified, the widget will be horizontally center aligned
layout_centerVertical	Accepts boolean value. If specified, the widget will be vertically center aligned
layout_below	Accepts sibling widget id. Places the widget below the view as specified widget id.
layout_above	Accepts sibling widget id. Places the widget above the specified widget id.
layout_toRightOf	Accepts sibling widget id. Places the widget to right of the view as specified widget id.
layout_toLeftOf	Accepts sibling widget id. Places the widget to left of the view as specified widget id.
layout_toEndOf	Accepts sibling widget id. Places the widget to end of the view as specified widget id.
layout_toStartOf	Accepts sibling widget id. Places the widget to the beginning of the view as specified widget id.

Some Example:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_height="fill_parent"
android:layout_width="fill_parent">

<TextView
android:text="RED"
android:id="@+id/TextView01"
android:layout_height="wrap_content"
android:background="#f00"
android:gravity="center"
android:textColor="#000"
android:layout_width="wrap_content"
android:padding="25dp"></TextView>



<TextView
android:text="ORANGE"
android:layout_height="wrap_content"
android:background="#ffa500"
android:gravity="center"
android:textColor="#000"
android:id="@+id/TextView02"
android:layout_width="wrap_content"
android:layout_centerHorizontal="true"
android:padding="25dp"></TextView>

<TextView
android:text="YELLOW"
android:layout_height="wrap_content"
android:background="#ffff00"
android:gravity="center"
android:textColor="#000"
android:id="@+id/TextView03"
android:layout_width="wrap_content"
android:layout_alignParentRight="true"
android:padding="25dp"></TextView>
<TextView
android:text="GREEN"
android:layout_height="wrap_content"
android:background="#0f0"
android:gravity="center"
android:textColor="#000"
android:id="@+id/TextView04"
android:layout_width="wrap_content"
android:layout_toLeftOf="@+id/TextView05"
android:padding="25dp"
android:layout_centerVertical="true"></TextView>
<TextView
android:text="BLUE"
android:layout_height="wrap_content"
android:background="#00f"
android:gravity="center"
android:textColor="#fff"
android:id="@+id/TextView05"
android:layout_width="wrap_content"
android:layout_centerInParent="true"
android:layout_margin="10dp"
android:padding="25dp"></TextView>
<TextView
android:text="INDIGO"
android:layout_height="wrap_content"
android:gravity="center"
android:textColor="#fff"
android:id="@+id/TextView06"
android:layout_width="wrap_content"
android:layout_toRightOf="@+id/TextView05"
android:background="#4b0082"
android:padding="25dp"
android:layout_centerVertical="true"></TextView>
<TextView
android:text="VIOLET"
android:layout_height="wrap_content"
android:background="#ee82ee"
android:gravity="center"
android:textColor="#000"
android:id="@+id/TextView07"
android:layout_alignParentBottom="true"
android:layout_width="fill_parent"
android:padding="25dp"></TextView>


</RelativeLayout>




Example 3:

<RelativeLayout 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"

    android:orientation="vertical"

    tools:context=".MainActivity" >

    <Button

        android:id="@+id/buttone1"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:layout_alignParentTop="true"

        android:padding="5dp"

        android:text="Button1" />

    <Button

        android:id="@+id/buttone2"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_below="@+id/buttone1"

        android:layout_marginTop="15dp"

        android:padding="5dp"

        android:text="Button2" />

    <Button

        android:id="@+id/buttone3"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_below="@+id/buttone1"

        android:layout_marginLeft="15dp"

        android:layout_marginTop="15dp"

        android:layout_toRightOf="@+id/buttone2"

        android:padding="5dp"

        android:text="Button3" />

    <Button

        android:id="@+id/buttone4"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_alignParentRight="true"

        android:layout_below="@+id/buttone2"

        android:layout_marginRight="10dp"

        android:layout_marginTop="25dp"

        android:padding="5dp"

        android:text="Button4" />

    <Button

        android:id="@+id/buttone5"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_alignParentLeft="true"

        android:layout_below="@+id/buttone4"

        android:layout_marginLeft="15dp"

        android:layout_marginTop="50dp"

        android:padding="5dp"

        android:text="Button5" />

    <Button

        android:id="@+id/buttone6"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_centerHorizontal="true"

        android:layout_centerVertical="true"

        android:text="Button6" />

    <Button

        android:id="@+id/buttone7"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:layout_alignParentBottom="true"

        android:padding="5dp"

        android:text="Button7" />

</RelativeLayout>