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Not able to see icons in side navigation bar in android studio

I'm not able to see the icons I am providing in the menu item to see it inside the navigation bar.
Below is the code of the menu main_menu.xml file:
<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android">
<item android:id="#+id/home_nav" android:title="Home" android:icon="#drawable/home"/>
<item android:id="#+id/profile" android:title="Profile" android:icon="#drawable/profile"/>
<item android:id="#+id/generate_mpin" android:title="Generate Mpin" android:icon="#drawable/gen_mpin_icon"/>
<item android:id="#+id/history" android:title="My History" android:icon="#drawable/history_icon"/>
<item android:id="#+id/acc_statement" android:title="Account Statement" android:icon="#drawable/acc_stat_icon"/>
<item android:id="#+id/funds" android:title="Funds" android:icon="#drawable/funds_icon"/>
<item android:id="#+id/game_rates" android:title="Game Rates" android:icon="#drawable/game_rates_icon"/>
<item android:id="#+id/how_to_play" android:title="How To Play" android:icon="#drawable/how_to_play_icon"/>
<item android:id="#+id/settings" android:title="Settings" android:icon="#drawable/settings_icon"/>
<item android:id="#+id/logout" android:title="Logout" android:icon="#drawable/logout_icon"/>
</menu>
Below is the result I'm getting while using the above XML file:
What I getting:
What I expecting:

Why do you use onPrepareOptionsMenu to create a menu where the layout file appears at the top of the screen but the runtime appears at the bottom?

I want to make a menu on my app's top like which showed me in the AS's xml, but in Android 6.0,it's on the bottom. How can I solve this problem? Thanks.
I have tried many methods like change my code, add the android:showAsAction='always', but it doesn't work.
<menu
xmlns:android="http://schemas.android.com/apk/res/android">
<item
android:id="#+id/menu_new_folder"
android:title="#string/menu_create_folder" />
<item
android:id="#+id/menu_export_text"
android:title="#string/menu_export_text"/>
<item
android:id="#+id/menu_sync"
android:title="#string/menu_sync"/>
<item
android:id="#+id/menu_setting"
android:title="#string/menu_setting" />
<item
android:id="#+id/menu_search"
android:title="#string/menu_search"/>

Create menu like this -
<menu
xmlns:android="http://schemas.android.com/apk/res/android">
<item
android:id="#+id/action_more"
android:orderInCategory="1"
android:icon="#drawable/ic_menu_dots"
android:title="more"
app:showAsAction="always">
<menu>
<item
android:id="#+id/menu_new_folder"
android:title="#string/menu_create_folder" />
<item
android:id="#+id/menu_export_text"
android:title="#string/menu_export_text"/>
<item
android:id="#+id/menu_sync"
android:title="#string/menu_sync"/>
<item
android:id="#+id/menu_setting"
android:title="#string/menu_setting" />
<item
android:id="#+id/menu_search"
android:title="#string/menu_search"/>
</menu>
</item>
</menu>
And in your activity's onCreateOptionMenu add this -
menu.findItem(R.id.action_more).setShowAsAction(MenuItem.SHOW_AS_ACTION_ALWAYS)

set Image(PNG etc) as an icon on drawer layout navigation items

I'm setting the image as icon but its showing grey icon not the image,
This #drawable/image_second is the image I want to use as icon.
<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
tools:showIn="navigation_view">
<group android:checkableBehavior="single">
<item
android:id="#+id/nav_home"
android:icon="#drawable/image_second"
android:title="#string/menu_home" />
<item
android:id="#+id/nav_gallery"
android:icon="#drawable/ic_menu_gallery"
android:title="#string/menu_gallery" />
<item
android:id="#+id/nav_slideshow"
android:icon="#drawable/ic_menu_slideshow"
android:title="#string/menu_slideshow" />
<item
android:id="#+id/nav_tools"
android:icon="#drawable/ic_menu_manage"
android:title="#string/menu_tools" />
</group>
<item android:title="Communicate">
<menu>
<item
android:id="#+id/nav_share"
android:icon="#drawable/ic_menu_share"
android:title="#string/menu_share" />
<item
android:id="#+id/nav_send"
android:icon="#drawable/ic_menu_send"
android:title="#string/menu_send" />
</menu>
</item>
</menu>
after running the code,I get this,
please tell what to do and why its happening..
As always thanks a lot..

You can do so programmatically using
NavigationView.setItemIconTintList.
yourNavigationView.setItemIconTintList(null);
Also If you want to change the tint of other icons use this
In XML
<android.support.design.widget.NavigationView
...
app:itemIconTint="#android:color/black"
... />

Try removing the item icon tint.
mNavigationView.setItemIconTintList(null);

Actions aren't showing on Toolbar with "ifRoom"

I have problem with actions on Toolbar in my Android app.
I have a group with some actions with app:showAsAction="ifRoom" attribute. Everything works fine if there are fewer than 4 items with ifRoom. But when I add fourth item, then all the items disappear from toolbar.
It works fine:
<menu xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto">
<group android:id="#+id/group_paint"
android:orderInCategory="1"
app:showAsAction="ifRoom">
<item android:id="#+id/action_layers"
android:icon="#drawable/ic_layers_white_24dp"
android:title="#string/action_layers"
android:orderInCategory="3"
app:showAsAction="ifRoom"/>
<item android:id="#+id/action_tool"
android:icon="#drawable/ic_properties_white_24dp"
android:title="#string/action_tool"
android:orderInCategory="4"
app:showAsAction="ifRoom" />
<item android:id="#+id/action_action1"
android:icon="#drawable/ic_action1_white_24dp"
android:title="#string/action_1"
android:orderInCategory="7"
app:showAsAction="ifRoom" />
<item
android:id="#+id/action_settings"
android:icon="#drawable/ic_settings_white_24dp"
android:title="#string/action_settings"
android:orderInCategory="7"
app:showAsAction="never" />
</group>
</menu>
Unexpected result:
<menu xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto">
<group android:id="#+id/group_paint"
android:orderInCategory="1"
app:showAsAction="ifRoom">
<item android:id="#+id/action_layers"
android:icon="#drawable/ic_layers_white_24dp"
android:title="#string/action_layers"
android:orderInCategory="3"
app:showAsAction="ifRoom"/>
<item android:id="#+id/action_tool"
android:icon="#drawable/ic_properties_white_24dp"
android:title="#string/action_tool"
android:orderInCategory="4"
app:showAsAction="ifRoom" />
<item android:id="#+id/action_action1"
android:icon="#drawable/ic_action1_white_24dp"
android:title="#string/action_1"
android:orderInCategory="7"
app:showAsAction="ifRoom" />
<item android:id="#+id/action_action2"
android:icon="#drawable/ic_action2_white_24dp"
android:title="#string/action_2"
android:orderInCategory="8"
app:showAsAction="ifRoom" />
<item
android:id="#+id/action_settings"
android:icon="#drawable/ic_settings_white_24dp"
android:title="#string/action_settings"
android:orderInCategory="7"
app:showAsAction="never" />
</group>
</menu>
What I would like to see is: three actions on toolbar and the fourth in the overflow menu.

You are using the <group> element to treat the items as a group. If you do not want to treat the items as a group (e.g., you want them to appear in the action bar individually based upon available space), get rid of the <group> element.

Navigation Drawer menu items selected within different groups

I have a working Navigation Drawer and having some issues with menuItem.setChecked(true); when using groups and headers within the menu. It's not highlighting menu items as expected.
Here is my XML:
<menu xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
tools:context=".ActivityMap">
<group android:checkableBehavior="single">
<item
android:id="#+id/nav_welcome"
android:icon="#drawable/abc_btn_check_to_on_mtrl_000"
android:title="Welcome" />
<item
android:id="#+id/nav_map_showmap"
android:icon="#mipmap/ic_map_black_24dp"
android:title="Show Map" />
<item
android:icon="#mipmap/ic_list_black_24dp"
android:title="Show List" />
<item android:title="Settings">
<menu>
<item
android:id="#+id/nav_database_check"
android:icon="#mipmap/ic_cloud_done_black_24dp"
android:title="Update Database" />
<item
android:id="#+id/nav_map_settings"
android:icon="#mipmap/ic_settings_black_24dp"
android:title="App Preferences" />
</menu>
</item>
<item android:title="General">
<menu>
<item
android:id="#+id/nav_general_about"
android:icon="#mipmap/ic_info_black_24dp"
android:title="About" />
<item
android:id="#+id/nav_general_help"
android:icon="#mipmap/ic_help_black_24dp"
android:title="Help" />
<item
android:id="#+id/nav_general_report"
android:icon="#mipmap/ic_email_black_24dp"
android:title="Feedback / Report error" />
</menu>
</item>
</group>
</menu>
As you can see I have 3 menu items, then a Settings Group with 2 menu items, then a General Group with 3 menu items.
Now with the first 3 menu items, the menuItem.setChecked(true); is working as expected, and highlighting that menu item. However, none of the following menu items within the subset ("Settings" or "General" subsets) are highlighting correctly.
I read that the <group android:checkableBehaviour="single"> can encapsulate the whole block, but that doesn't seem to be working.
Any thoughts? Cheers.
EDIT - Added Screenshot of the menu structure

UPDATE
If you have upgraded your Android Studio to 1.4, you can create a new project (with Navigation Drawer Activity template). Then, you can update your menu file as the following (pay attention to the two lines <group android:checkableBehavior="single"> inside 2 sub-menus at "Communicate" and "BNK"):
<?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>
<group android:checkableBehavior="single">
<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" />
</group>
</menu>
</item>
<item android:title="BNK">
<menu>
<group android:checkableBehavior="single">
<item android:id="#+id/nav_share_bnk" android:icon="#android:drawable/ic_menu_share"
android:title="Share BNK" />
<item android:id="#+id/nav_send_bnk" android:icon="#android:drawable/ic_menu_send"
android:title="Send BNK" />
</group>
</menu>
</item>
</menu>
And here is the screenshot
END OF UPDATE
As I have commented, please try putting <group android:checkableBehavior="single"> below menus of Settings and General instead of putting below the outside menu. That means you will have 2 groups. Hope this helps!

<group android:checkableBehavior="single">
<item
android:id="#+id/nav_vi_tri"
android:icon="#drawable/ic_menu_camera"
android:title="Vị trí" />
<item
android:id="#+id/nav_xem_lai"
android:icon="#drawable/ic_menu_gallery"
android:title="Xem lại hành trình" />
<item
android:id="#+id/nav_hinh_anh"
android:icon="#drawable/ic_menu_slideshow"
android:title="Hình ảnh" />
<item android:title="Báo cáo">
<menu>
<group android:checkableBehavior="single">
<item
android:id="#+id/nav_baocao1"
android:icon="#drawable/ic_menu_camera"
android:title="Hành trình xe chạy" />
<item
android:id="#+id/nav_baocao2"
android:icon="#drawable/ic_menu_gallery"
android:title="Tốc độ của xe" />
<item
android:id="#+id/nav_baocao3"
android:icon="#drawable/ic_menu_slideshow"
android:title="Quá tốc độ" />
<item
android:id="#+id/nav_baocao4"
android:icon="#drawable/ic_menu_slideshow"
android:title="Thời gian lái" />
<item
android:id="#+id/nav_baocao5"
android:icon="#drawable/ic_menu_slideshow"
android:title="Dừng đỗ" />
<item
android:id="#+id/nav_baocao6"
android:icon="#drawable/ic_menu_slideshow"
android:title="Tổng hợp theo xe" />
<item
android:id="#+id/nav_baocao7"
android:icon="#drawable/ic_menu_slideshow"
android:title="Quãng đường nhiên liệu" />
</group>
</menu>
</item>
<item android:title="Communicate">
<menu>
<group android:checkableBehavior="single">
<item
android:id="#+id/nav_tien_ich"
android:icon="#drawable/ic_menu_share"
android:title="Tiện ích" />
<item
android:id="#+id/nav_logout"
android:icon="#drawable/ic_menu_send"
android:title="Đăng xuất" />
</group>
</menu>
</item>
</group>
it work for me :D

Here you can use three different groups top , center and bottom. And first top group will have 3 menu items as you have . Then the center group can be same as your "Settings" menu with 2 items. And bottom group will have 2 items as it is in General.
And in your java file you can handle Item Selected Listener to handle the item click of the navigation menu.
// This method will trigger on item Click of navigation menu
#Override
public boolean onNavigationItemSelected(MenuItem p_menuItem) {
//Checking if the item is in checked state or not, if not make it in checked state
if(p_menuItem.getGroupId()==R.id.menu_top){
m_navigationView.getMenu().setGroupCheckable(R.id.menu_bottom,false,true);
m_navigationView.getMenu().setGroupCheckable(R.id.menu_center,false,true);
m_navigationView.getMenu().setGroupCheckable(R.id.menu_top,true,true);
}
else if(p_menuItem.getGroupId()==R.id.menu_center){
m_navigationView.getMenu().setGroupCheckable(R.id.menu_bottom,false,true);
m_navigationView.getMenu().setGroupCheckable(R.id.menu_center,true,true);
m_navigationView.getMenu().setGroupCheckable(R.id.menu_top,false,true);
}
else{
m_navigationView.getMenu().setGroupCheckable(R.id.menu_bottom,true,true);
m_navigationView.getMenu().setGroupCheckable(R.id.menu_center,false,true);
m_navigationView.getMenu().setGroupCheckable(R.id.menu_top,false,true);
}
p_menuItem.setChecked(true);
m_drawerLayout.closeDrawers();

Try this:
private int selectedItem = 0;
private void setSelectedItem(MenuItem menuItem, int position) {
mNavigationView.getMenu().getItem(selectedItem).setChecked(false);
mNavigationView.getMenu().getItem(position).setChecked(true);
if (menuItem.getGroupId() == R.id.group_2) {
mNavigationView.getMenu().setGroupCheckable(R.id.group_1, false, true);
mNavigationView.getMenu().setGroupCheckable(R.id.group_2, true, true);
} else {
mNavigationView.getMenu().setGroupCheckable(R.id.group_1, true, true);
mNavigationView.getMenu().setGroupCheckable(R.id.group_2, false, true);
}
//Update highlighted item in the navigation menu
menuItem.setChecked(true);
selectedItem = position;
}

Change the position on closing group tag </group> in your code as under:
Look the position carefully and do it.
<menu xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
tools:context=".ActivityMap">
<group android:checkableBehavior="single">
<item
android:id="#+id/nav_welcome"
android:icon="#drawable/abc_btn_check_to_on_mtrl_000"
android:title="Welcome" />
<item
android:id="#+id/nav_map_showmap"
android:icon="#mipmap/ic_map_black_24dp"
android:title="Show Map" />
<item
android:icon="#mipmap/ic_list_black_24dp"
android:title="Show List" />
</group>
<item android:title="Settings">
<menu>
<item
android:id="#+id/nav_database_check"
android:icon="#mipmap/ic_cloud_done_black_24dp"
android:title="Update Database" />
<item
android:id="#+id/nav_map_settings"
android:icon="#mipmap/ic_settings_black_24dp"
android:title="App Preferences" />
</menu>
</item>
<item android:title="General">
<menu>
<item
android:id="#+id/nav_general_about"
android:icon="#mipmap/ic_info_black_24dp"
android:title="About" />
<item
android:id="#+id/nav_general_help"
android:icon="#mipmap/ic_help_black_24dp"
android:title="Help" />
<item
android:id="#+id/nav_general_report"
android:icon="#mipmap/ic_email_black_24dp"
android:title="Feedback / Report error" />
</menu>
</item>
</menu>