search bar like skype android

layout

<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.AppBarLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    xmlns:local="http://schemas.android.com/apk/res-auto">

    <android.support.v7.widget.Toolbar
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:minHeight="?attr/actionBarSize"
        android:id="@+id/toolbar"
        local:popupTheme="@style/ThemeOverlay.AppCompat.Light"
        local:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar" />

    <EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="@null"
        android:id="@+id/search_edit_text"
        android:hint="Search"
        android:textColor="@color/white"
        android:textColorHint="#BDBDBD"
        android:padding="0dp"
        android:textSize="20sp"
        android:imeOptions="actionSearch"
        android:layout_margin="16dp"
        android:inputType="text"
        android:maxLines="1"

        />
</android.support.design.widget.AppBarLayout>