android - No blank space between the header the first element of my NavigationDrawerActivity -


this question has answer here:

when create new project template navigation drawer activity, have navigation drawer :

enter image description here

i (without blank space between header , first element of menu) :

enter image description here

is possible ?

activity_main.xml :

<?xml version="1.0" encoding="utf-8"?> <android.support.v4.widget.drawerlayout 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/drawer_layout"     android:layout_width="match_parent"     android:layout_height="match_parent"     android:fitssystemwindows="true"     tools:opendrawer="start">      <include         layout="@layout/app_bar_main"         android:layout_width="match_parent"         android:layout_height="match_parent" />      <android.support.design.widget.navigationview         android:id="@+id/nav_view"         android:layout_width="wrap_content"         android:layout_height="match_parent"         android:layout_gravity="start"         android:fitssystemwindows="true"         app:headerlayout="@layout/nav_header_main"         app:menu="@menu/activity_main_drawer" />  </android.support.v4.widget.drawerlayout>

app_bar_main.xml :

<?xml version="1.0" encoding="utf-8"?> <android.support.design.widget.coordinatorlayout 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:layout_width="match_parent"     android:layout_height="match_parent"     tools:context="teamgeny.com.myapplication.mainactivity">      <android.support.design.widget.appbarlayout         android:layout_width="match_parent"         android:layout_height="wrap_content"         android:theme="@style/apptheme.appbaroverlay">          <android.support.v7.widget.toolbar             android:id="@+id/toolbar"             android:layout_width="match_parent"             android:layout_height="?attr/actionbarsize"             android:background="?attr/colorprimary"             app:popuptheme="@style/apptheme.popupoverlay" />      </android.support.design.widget.appbarlayout>      <include layout="@layout/content_main" />      <android.support.design.widget.floatingactionbutton         android:id="@+id/fab"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:layout_gravity="bottom|end"         android:layout_margin="@dimen/fab_margin"         app:srccompat="@android:drawable/ic_dialog_email" />  </android.support.design.widget.coordinatorlayout>

nav_header_main.xml :

<?xml version="1.0" encoding="utf-8"?> <linearlayout 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="@dimen/nav_header_height"     android:background="@drawable/side_nav_bar"     android:gravity="bottom"     android:orientation="vertical"     android:paddingbottom="@dimen/activity_vertical_margin"     android:paddingleft="@dimen/activity_horizontal_margin"     android:paddingright="@dimen/activity_horizontal_margin"     android:paddingtop="@dimen/activity_vertical_margin"     android:theme="@style/themeoverlay.appcompat.dark">      <imageview         android:id="@+id/imageview"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:paddingtop="@dimen/nav_header_vertical_spacing"         app:srccompat="@android:drawable/sym_def_app_icon" />      <textview         android:layout_width="match_parent"         android:layout_height="wrap_content"         android:paddingtop="@dimen/nav_header_vertical_spacing"         android:text="android studio"         android:textappearance="@style/textappearance.appcompat.body1" />      <textview         android:id="@+id/textview"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:text="android.studio@android.com" />  </linearlayout>

content_main.xml :

<?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:layout_width="match_parent"     android:layout_height="match_parent"     app:layout_behavior="@string/appbar_scrolling_view_behavior"     tools:context="teamgeny.com.myapplication.mainactivity"     tools:showin="@layout/app_bar_main">      <textview         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:text="hello world!"         app:layout_constraintbottom_tobottomof="parent"         app:layout_constraintleft_toleftof="parent"         app:layout_constraintright_torightof="parent"         app:layout_constrainttop_totopof="parent" />  </android.support.constraint.constraintlayout>

i found solution overriding predefined dimensions adding in dimens.xml.

<dimen name="design_navigation_padding_top_default" tools:override="true">0dp</dimen> <dimen name="design_navigation_separator_vertical_padding" tools:override="true">0dp</dimen> <dimen name="design_navigation_padding_bottom" tools:override="true">0dp</dimen>

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