First try ConstraintLayout

ConstraintLayout allows you to create large and complex layouts with a flat view hierarchy (no nested view groups). It's similar to RelativeLayout in that all views are layed out according to relationships between sibling views and the parent layout, but it's more flexible than RelativeLayout and easier to use with Android Studio's Layout Editor.

To use ConstraintLayout, make sure to install Support Repository of ConstraintLayout for Android and Solver for ConstraintLayout in Android SDK Manager:

Add dependency of ConstraintLayout library in your module-level build.gradle file:

dependencies {
    compile 'com.android.support.constraint:constraint-layout:1.0.0-beta4'
}

In the toolbar or sync notification, click Sync Project with Gradle Files.

We can convert an existing layout to a constraint layout in Android Studio's Layout Editor:
- Open your layout in Android Studio and click the Design tab at the bottom of the editor window.
- In the Component Tree window, right-click the layout and click Convert layout to ConstraintLayout.

After finished, the helloworld default layout converted to:

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout 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:id="@+id/activity_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.blogspot.android_er.androidconstraintlayout.MainActivity">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Hello World!"
        tools:layout_constraintTop_creator="1"
        android:layout_marginStart="16dp"
        android:layout_marginTop="16dp"
        tools:layout_constraintLeft_creator="1"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintTop_toTopOf="parent" />
</android.support.constraint.ConstraintLayout>

This video show howto, step-by-step:


Reference:
Build a Responsive UI with ConstraintLayout

More:
Building interfaces with ConstraintLayout in Android Studio