Develop Reference

Simple Navigation Drawer

https://developer.android.com/training/implementing-navigation/nav-drawer#java
When I create the menu resource and input the code I get a error saying cannot resolve symbol. This is my code
<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android">
<group android:checkableBehavior="single">
<item
android:id="#+id/nav_camera"
android:icon="#drawable/ic_menu_camera"
android:title="#string/import" />
<item
android:id="#+id/nav_gallery"
android:icon="#drawable/ic_menu_gallery"
android:title="#string/gallery" />
<item
android:id="#+id/nav_slideshow"
android:icon="#drawable/ic_menu_slideshow"
android:title="#string/slideshow" />
<item
android:id="#+id/nav_manage"
android:icon="#drawable/ic_menu_manage"
android:title="#string/tools" />
</group>
</menu>

How can I Modify default images of Navigation Drawer.?

I want to change default Images of Navigation Drawer in Android.When I'm changing it's not working any one help me please.Thanks stack over flow.how can I do this help me please.
<group android:checkableBehavior="single">
<item
android:id="#+id/nav_camera"
android:icon="#drawable/ic_menu_camera"
android:title="Import" />
<item
android:id="#+id/nav_gallery"
android:icon="#drawable/ic_menu_gallery"
android:title="Gallery" />
<item
android:id="#+id/nav_slideshow"
android:icon="#drawable/ic_menu_slideshow"
android:title="Slideshow" />
<item
android:id="#+id/nav_manage"
android:icon="#drawable/ic_menu_manage"
android:title="Tools" />
</group>
<item android:title="Communicate">
<menu>
<item
android:id="#+id/nav_share"
android:icon="#drawable/ic_menu_share"
android:title="Share" />
<item
android:id="#+id/nav_send"
android:icon="#drawable/ic_menu_send"
android:title="Send" />
</menu>
</item>

I hope you need some pre defined vector drawables as one of your comments was pointing to it.
Try
Right Click drawable folder
New -> Vector Asset
Enable Material Icon RadioButton (enabled by default)
Click Choose button
Select one image. change Resource name if required & click Next -> Finish.
Now a new vector drawable will be created in drawable folder & you can refer it using #drawable.

Here is my .xml
<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android">
<group android:checkableBehavior="single">
<item
android:id="#+id/nav_home"
android:icon="#drawable/ic_menu_home"
android:title="section1"
android:checked="true"/>
<item
android:id="#+id/nav_add_event"
android:icon="#drawable/ic_menu_addevent"
android:title="section2" />
<item
android:id="#+id/nav_managenews"
android:icon="#drawable/ic_menu_manage_news"
android:title="section3" />
<item
android:id="#+id/nav_leaderboard"
android:icon="#drawable/ic_menu_leadre_board"
android:title="section3"/>
<item
android:id="#+id/nav_mypoints"
android:icon="#drawable/ic_menu_mypoint"
android:title="section4" />
<item
android:id="#+id/nav_myprofile"
android:icon="#drawable/ic_menu_my_profile"
android:title="section5" />
<item
android:id="#+id/nav_change_password"
android:icon="#drawable/ic_change_password"
android:title="section6"/>
</group>
</menu>

changing icon of navigation drawer items

When I changing icon in navigation drawer items by using (drawable > image asset > 'Action bar and tab icon') or (copy + past ) in drawable folder, in app menu icon shows the 'Theme color' witch was selected form " image asset > 'Action bar and tab icon' > Theme ".
I tried to all the three theme but main icon can not be shown
Here the apps screenshot and activity_main_drawer.xml file and xml file screenshot
<?xml version="1.0" encoding="utf-8"?>
<group android:checkableBehavior="single">
<item android:id="#+id/nav_us"
android:icon="#drawable/eee"
android:title="US" />
<item android:id="#+id/nav_world" android:icon="#drawable/bbb"
android:title="World" />
<item android:id="#+id/nav_tech" android:icon="#drawable/f_g_h"
android:title="Tech" />
<item android:id="#+id/nav_sports" android:icon="#drawable/f_g_h"
android:title="Sports" />
<item android:id="#+id/nav_worl" android:icon="#android:drawable/ic_dialog_dialer"
android:title="World" />
<item android:id="#+id/nav_tec" android:icon="#android:drawable/ic_dialog_dialer"
android:title="Tech" />
<item android:id="#+id/nav_sport" android:icon="#android:drawable/ic_dialog_dialer"
android:title="Sports" />
</group>
<item android:title="Communicate">
<menu>
<item android:id="#+id/nav_share" android:icon="#android:drawable/btn_star"
android:title="About us" />
<item android:id="#+id/nav_send" android:icon="#android:drawable/ic_menu_send"
android:title="Contact us" />
</menu>
</item>

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android">
<group android:checkableBehavior="single">
<item
android:id="#+id/nav_camera"
android:icon="#drawable/ic_menu_camera"
android:title="Import" />
<item
android:id="#+id/nav_gallery"
android:icon="#drawable/ic_menu_gallery"
android:title="Gallery" />
<item
android:id="#+id/nav_slideshow"
android:icon="#drawable/ic_menu_slideshow"
android:title="Slideshow" />
<item
android:id="#+id/nav_manage"
android:icon="#drawable/ic_menu_manage"
android:title="Tools" />
</group>
<item android:title="Communicate">
<menu>
<item
android:id="#+id/nav_share"
android:icon="#drawable/ic_menu_share"
android:title="Share" />
<item
android:id="#+id/nav_send"
android:icon="#drawable/ic_menu_send"
android:title="Send" />
</menu>
</item>
Please have a look like this.

Main category icons in navigation drawers not visible

below is my xml code where vector image works on items but does not work on its parent. I have given comment for those two parents.I also wish to give colored icons there later and textcolor white.
<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android">
<group android:checkableBehavior="single">
<item
android:id="#+id/nav_camera"
android:icon="#drawable/ic_menu_camera"
android:title="Import" />
<item
android:id="#+id/nav_gallery"
android:icon="#drawable/ic_menu_gallery"
android:title="Gallery" />
<item
android:id="#+id/nav_slideshow"
android:icon="#drawable/ic_menu_slideshow"
android:title="Slideshow" />
</group>
<item android:title="Communicate"
android:icon="#drawable/ic_menu_share">
<!-- above image not visible but below visible-->
<menu>
<item
android:id="#+id/nav_share"
android:icon="#drawable/ic_menu_share"
android:title="Share" />
<item
android:id="#+id/nav_send"
android:icon="#drawable/ic_menu_send"
android:title="Send" />
</menu>
</item>
<item android:title="Setting"
android:icon="#drawable/ic_menu_share">
<!-- above image not visible but below visible -->
<menu>
<item
android:id="#+id/nav_share1"
android:icon="#drawable/ic_menu_share"
android:title="Share" />
<item
android:id="#+id/nav_send1"
android:icon="#drawable/ic_menu_send"
android:title="Send" />
</menu>
</item>
Here "Communicate " and "Setting" not showing icons

Put them in menu if you want to show icons also:
<group android:checkableBehavior="single">
<item
android:id="#+id/nav_camera"
android:icon="#drawable/ic_menu_camera"
android:title="Import" />
<item
android:id="#+id/nav_gallery"
android:icon="#drawable/ic_menu_gallery"
android:title="Gallery" />
<item
android:id="#+id/nav_slideshow"
android:icon="#drawable/ic_menu_slideshow"
android:title="Slideshow" />
</group>
<menu>
<item android:title="Communicate"
android:icon="#drawable/ic_menu_share">
<item
android:id="#+id/nav_share"
android:icon="#drawable/ic_menu_share"
android:title="Share" />
<item
android:id="#+id/nav_send"
android:icon="#drawable/ic_menu_send"
android:title="Send" />
</menu>
</item>
<menu>
<item android:title="Setting"
android:icon="#drawable/ic_menu_share">
<item
android:id="#+id/nav_share1"
android:icon="#drawable/ic_menu_share"
android:title="Share" />
<item
android:id="#+id/nav_send1"
android:icon="#drawable/ic_menu_send"
android:title="Send" />
</menu>
</item>
You can change the textcolor of all menu item using: app:itemTextColor="#android:color/white" attribute in xml code of navigation view.
Edit
You will get the colored icons if you use either
app:itemIconTint="null" in xml or
navigationView.setItemIconTintList(null); in your java code.

Android Navigation View Align Menu Items

In my app i have a nvigation view with some menu items. I want to align some of them to the center of the view. How can i achieve this correctly?
This is what i want:
activity_main_drawer.xml:
<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android">
<group android:checkableBehavior="single">
<item android:id="#+id/nav_camara" android:icon="#android:drawable/ic_menu_camera"
android:title="Import" />
<item android:id="#+id/nav_gallery" android:icon="#android:drawable/ic_menu_gallery"
android:title="Gallery" />
<item android:id="#+id/nav_slideshow" android:icon="#android:drawable/ic_menu_slideshow"
android:title="Slideshow" />
<item android:id="#+id/nav_manage" android:icon="#android:drawable/ic_menu_manage"
android:title="Tools" />
</group>
<item android:title="Communicate">
<menu>
<item android:id="#+id/nav_share" android:icon="#android:drawable/ic_menu_share"
android:title="Share" />
<item android:id="#+id/nav_send" android:icon="#android:drawable/ic_menu_send"
android:title="Send" />
</menu>
</item>
</menu>
Thanks in advance.

As far as I know this is not possible in easy way.
You could find or navigate through views hierarchy to find views or textviews you want to center.
But i think NavigationView is not designed to align things other than left or right