java - Android Material design error -

hi learning create material design using tutorial.https://www.youtube.com/watch?v=pmo8evkhjo8&list=plonjj3bvjzw6ctambjz1xd8elus1kxatd&index=3

and in design appbar has padding on sides. can me remove padding , make app real app bar.

here screen

app_bar

    <?xml version="1.0" encoding="utf-8"?> <android.support.v7.widget.toolbar xmlns:android="http://schemas.android.com/apk/res/android"     android:layout_width="match_parent" android:layout_height="wrap_content"     android:background="#dddd">  </android.support.v7.widget.toolbar> 

main activity

<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:paddingleft="@dimen/activity_horizontal_margin"     android:paddingright="@dimen/activity_horizontal_margin"     android:paddingtop="@dimen/activity_vertical_margin"     android:paddingbottom="@dimen/activity_vertical_margin" tools:context=".mainactivity">      <include android:id="@+id/app_bar" layout="@layout/app_bar"/>      <textview         android:layout_below="@+id/app_bar"         android:text="@string/hello_world" android:layout_width="wrap_content"         android:layout_height="wrap_content" />  </relativelayout> 

maniactivity.java

private toolbar toolbar;  @override protected void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview(r.layout.activity_main);      toolbar = (toolbar) findviewbyid(r.id.app_bar);     setsupportactionbar(toolbar); } 

in relative layout have put paddings. need remove them.

<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"    tools:context=".mainactivity">       <include android:id="@+id/app_bar" layout="@layout/app_bar"/>      <textview         android:layout_below="@+id/app_bar"         android:text="@string/hello_world"           android:layout_width="wrap_content"         android:layout_height="wrap_content" />  </relativelayout> 

check this. there no padding on toolbar. , if want give padding other children make 1 parent layout using linearlayout orientation of vertical , put both toolbar , relativelayout it.