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tools:showIn="navigation_view" not working

When i append tools:showIn="navigation_view" to my code it's not showing. But in video which i watched from Youtube this is working fine. What is the problem? Also I can't add library called
<?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/ic_main_home"
android:title="#string/home" />
<item
android:id="#+id/nav_timetable"
android:icon="#drawable/ic_subject_timetable"
android:title="#string/timetable" />
<item
android:id="#+id/nav_ogrnot"
android:icon="#drawable/ic_ogrnot"
android:title="#string/ogrnot" />
<item
android:id="#+id/nav_yemek_menu"
android:icon="#drawable/ic_yemek_menu"
android:title="#string/yemek_menu" />
<item
android:id="#+id/nav_homework"
android:icon="#drawable/ic_homework"
android:title="#string/homework" />
</group>
<item android:title="#string/optional">
<menu>
<item
android:id="#+id/nav_to_do_list"
android:icon="#drawable/ic_to_do_list"
android:title="#string/to_do_list" />
<item
android:id="#+id/nav_logout"
android:icon="#drawable/ic_logout"
android:title="#string/logout" />
</menu>
</item>
</menu>

I had the same issue with my code. The first thing I did was to delete my already created menu file (Android resource file) and start the process from the top.
Secondly, after creating the menu resource file, on a new line, after typing (tool:), press alt+enter to add this automatically for you... xmlns:tools="http://schemas.android.com/tools"... Then you can go ahead to type in tools:showIn=".....".
To know if this works, in line of code in tools:showIn, when typing the name in the quotes, just type "na'... if there are other popups or suggestions, then you're good to go.
Hope this helps.

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)

Changing style works only partially: text color changes, background doesn't

I'm trying to change the style of a Button when someone clicks on it. I want to change both the background as the text colour. However, only the text color is changed. From that I conclude that the style is changed, but for some reason the background can't be overwritten.
I'm using this code in the onClick handler:
Button send_button = (Button) findViewById(R.id.button1);
send_button.setTextAppearance(context, R.style.activeButtonTheme);
The relevant styles in my styles.xml are:
<style name="buttonTheme">
<item name="android:background">#color/white</item>
<item name="android:textColor">#color/orange</item>
<item name="android:paddingTop">6dp</item>
<item name="android:paddingBottom">6dp</item>
<item name="android:layout_margin">2dp</item>
</style>
<style name="activeButtonTheme" parent="#style/buttonTheme">
<item name="android:background">#color/orange</item>
<item name="android:textColor">#color/white</item>
</style>
What's the problem here?
I do not want to set the background color from Java, I only want to change the style in Java.

Use selector for that purpose. Check this link for details(Custom background section) Regarding to your code, define appropriate selector.xml file in your resources directory, something like that:
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:drawable="#drawable/drawable_for_dissabled_button" android:state_enabled="false"/>
<item android:drawable="#drawable/drawable_for_pressed_button" android:state_enabled="true" android:state_pressed="true"/>
<item android:drawable="#drawable/drawable_for_enabled_button" android:state_enabled="true" android:state_focused="true"/>
<item android:drawable="#drawable/drawable_for_enabled_button" android:state_enabled="true"/>
</selector>
Assign just created selector to the button in the layout file:
<Button android:id="#+id/your_button_id"
android:background="#drawable/selector" />

Android, How to change the actionbars logo button on state change?

So I'm wondering how one could implement to an action bar with a logo button, a different image per state.(pressed, released etc).
I know how to do this for a normal button, but I'm not sure if it's possible with the actionbars logo button?
And if it's not, how could one implement am action bar that supports this? externals libs?
Thank you.

Create a drawable xml file in res/drawable such as res/drawable/button_selector.xml
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:drawable="#drawable/button_pressed"
android:state_pressed="true" />
<item android:drawable="#drawable/button_normal" />
</selector>
where button_pressed and button_normalare just regular png files in one of your drawable directories (e.g/ drawables-hdpi)
Then in your menu.xml or in your code you can refer to #drawable/button_selector or R.drawable.button_selector and the image will change automatically when the button is pressed.
If you need to change the ActionBar button background you need to override the theme in your res/values/style.xml.
<style name="YourTheme.Sherlock" parent="#style/Theme.Sherlock">
<item name="actionBarItemBackground">#drawable/actionbar_item_background_selector</item>
<item name="android:actionBarItemBackground">#drawable/actionbar_item_background_selector</item>
</style>
Both lines matter: one for the SherlockActionBar and one for the standard ActionBar
Then set the theme to your activity in the manifest:
<activity
android:name=".yourActivity"
android:theme="#style/YourTheme.Sherlock" >
</activity>
And here is actionbar_item_background_selector.xml to be placed in res/drawable
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<!-- Even though these two point to the same resource, have two states so the drawable will invalidate itself when coming out of pressed state. -->
<item android:state_focused="true" android:state_enabled="false" android:state_pressed="true" android:drawable="#drawable/scene_overlay_bar_pressed_center" />
<item android:state_focused="true" android:state_enabled="false" android:drawable="#drawable/abs__list_selector_disabled_holo_light" />
<item android:state_focused="true" android:state_pressed="true" android:drawable="#drawable/scene_overlay_bar_pressed_center" />
<item android:state_focused="false" android:state_pressed="true" android:drawable="#drawable/scene_overlay_bar_pressed_center" />
<item android:state_focused="true" android:drawable="#drawable/abs__list_focused_holo" />
<item android:drawable="#android:color/transparent" />
</selector>
replace the background with the drawable of your choice where android:state_pressed="true"
It's a lot to do for just a background but that is how the ActionBar works.

you can use a selector to pick different image.
Android ImageButton with disabled UI feel
may be help

I think you are looking for this:
final ActionBar bar = getActionBar();
bar.setDisplayHomeAsUpEnabled(true);
This automatically makes the logo you have set look like its being pressed when its clicked. No need to have different images to show state change. Thats a pretty easy way. Though if you are using ActionBarSherlock this won't work, I think. Strictly 4.0 I believe. Check out the doc on ActionBar.

android: Custom Submenus

I want to create a customized submenu where i can add an "about page" to my application. So my submenu would just be a text view with a bunch of info. Im currently defining my menu in XML. Any help or links would be great, thanks!!!
<?xml version="1.0" encoding="UTF-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android">
<item android:id="#+id/settings_menu"
android:title="Settings" />
<item android:id="#+id/about_menu"
android:title="About">
<menu>
<item android:id="#+id/about_submenu"
android:title="Tip Message" />
</menu>
</item>
<item android:id="#+id/quit_menu"
android:title="Quit" />
</menu>
Also just out of curiosity, how would i define a more complex custom submenu, like one that takes user input from a keyboard.

I think it's easier to make something look like a menu. Try Activity with #android:drawable/menu_submenu_background as a background for example.