[DEPRECATED in support lib v26] you should now use ConstraintLayout widget https://developer.android.com/training/constraint-layout/index.html

I made a sample of the new percent support library.
You can check official docs reference here and here.
This library provide percentage based layouts, horizontal and vertical at the same time.

simple result

complex result

How to use :

just add percent support library to your project

dependencies {
    compile 'com.android.support:percent:25.3.0'
}

###Supported Layouts :

####PercentRelativeLayout

<android.support.percent.PercentRelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    
    <View
        android:id="@+id/top_left"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:layout_alignParentTop="true"
        android:background="#ff44aacc"
        app:layout_heightPercent="20%"
        app:layout_widthPercent="70%" />

    <View
        android:id="@+id/top_right"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:layout_alignParentTop="true"
        android:layout_toRightOf="@+id/top_left"
        android:background="#ffe40000"
        app:layout_heightPercent="20%"
        app:layout_widthPercent="30%" />


    <View
        android:id="@+id/bottom"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_below="@+id/top_left"
        android:background="#ff00ff22"
        app:layout_heightPercent="80%" />
</android.support.percent.PercentRelativeLayout>

####PercentLinearLayout

<com.juliengenoud.percentsamples.PercentLinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">
     <View
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:background="#ff44aacc"
        app:layout_heightPercent="10%"
        app:layout_widthPercent="60%"/>

    <View
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:background="#ff4400cc"
        app:layout_heightPercent="10%"
        app:layout_widthPercent="70%"/>
</com.juliengenoud.percentsamples.PercentLinearLayout>

####PercentFrameLayout

<android.support.percent.PercentFrameLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
        <!-- ... XML CODE -->
</android.support.percent.PercentFrameLayout>

###Stylable :

• heightPercent
• widthPercent
• marginBottomPercent
• marginEndPercent
• marginLeftPercent
• marginPercent
• marginRightPercent
• marginStartPercent
• marginTopPercent

Pre-requisites

• Android SDK v25
• Android Percent Support Repository v25.3.0

####License Mit