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Android: Hide 3 dots from Navigation view header at right

How to hide 3 dots from Navigation header which comes in the right of header? This could be repeated question. I found few similar questions and their answers but they were for older version of Android. I am using Android sdk 21.
Any idea how to hide that 3 dot button?

Just Remove Override Method like this
#Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.search_and_add, menu);
return true;
}
This Override Method is responsible to for creating three dote as you mention it's really OptionMenu. If you don't want it, don't override onCreateOptionsMenumethod.
Alternative
Don't Inflate the menu xml. Just block the line like this
//getMenuInflater().inflate(R.menu.search_and_add, menu);
other code can remain same. No problem at all..

Those "3 Dots" are the "Overflow" menu, and is created when you establish a menu using a file in the menu resources directory.
If you have buttons or functionality you are wanting to expose via you action bar, you will need to have the overflow buttons (or instead, you can choose to have your buttons exposed at the top level inside the Action bar.
If you really don't want a menu, get rid of the menu.xml file describing this menu, and then get rid of the onCreateOptionsMenu() from your Activity.
Here are the official docs, which describe how this works.

I think you are speaking about the options menu, to get rid of it remove the override of the method onCreateOptionsMenu

In your menu folder the xmlfile that is used by your activity, change the app:showAsAction="never" to app:showAsAction="always" or some other you can see the options that are availabe by pressing ctrl+space.
Or else to get rid of it completely just remove the whole code and it's corresponding usages.

Toolbar in DialogFragment

In our app, we have a few fragments that can be shown either as fullscreen fragments or as dialog fragments. These fragments inherit from DialogFragment and we make sure to instantiate them correctly depending the mode the app is executed in (either fullscreen or dialog).
We thought about adding some extra functionality to some of these dialog fragments after the latest changes in the Toolbar widget were introduced in the support library with Lollipop. The idea is to have the type of options menu we would normally have in an ordinary fragment (i.e. the options menu inflated after onCreateOptionsMenu is executed) present in our subclasses of DialogFragment ONLY when these are visualized as dialogs. In short: when the fragments are shown in fullscreen mode we inflate a traditional options menu, and when the fragments are shown as dialogs we would like to have the same options menu inflated but using the new toolbar widget in standalone mode.
I followed the steps from http://android-developers.blogspot.dk/2014/10/appcompat-v21-material-design-for-pre.html and I managed to "activate" the toolbar, but it seems the menu is not inflated - see attached screenshots (picture one fragment in fullscreen mode, and picture two in dialog mode).
Is it even possible to inflate an options menu with the new toolbar in a DialogFragment?

Is it even possible to inflate an options menu with the new toolbar in
a DialogFragment?
first of all your design is ok and toolbar is supposed to be used every where lets have a look at this from Chris Banes google engineer link:
// Set an OnMenuItemClickListener to handle menu item clicks
toolbar.setOnMenuItemClickListener(
new Toolbar.OnMenuItemClickListener() {
#Override
public boolean onMenuItemClick(MenuItem item) {
// Handle the menu item
return true;
}
});
// Inflate a menu to be displayed in the toolbar
toolbar.inflateMenu(R.menu.your_toolbar_menu);
and also android developer toolbar standalone sample:
http://android-developers.blogspot.com/2014/10/appcompat-v21-material-design-for-pre.html

Yes, DialogFragment has setHasOptions() function. Define the toolbar in the layout of your dialog and use it as if it is in an activity. A toolbar doesnt mind being in an activity or a fragment or a dialog fragment.......
Be sure that you use
setHasOptionsMenu(true) in onActivityCreated method....
Then, as usual override
#Override
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
super.onCreateOptionsMenu(menu, inflater);
inflater.inflate(R.menu.my_menu, menu);
}
and
#Override
public boolean onOptionsItemSelected(MenuItem item) {
return super.onOptionsItemSelected(item);
}

What is the use of invalidateOptionsMenu() in android

I am a newbie to android when I am going through a sample code for navigation drawer I found he called the method invalidateOptionsMenu() so I searched regarding its functionality but couldn't find an answer so can anyone please brief me its functionality and whenshould we use that.

This function tell android that it should redraw the menu. By default, once the menu is created, it won't be redrawn every frame (since that would be useless to redraw the same menu over and over again).
You should call this function when you changed something in the option menu (added an element, deleted an element or changed a text). This way android will know that it's time te redraw the menu and your change will appear.
Hope this answers your question

I use this method in combination with actionbar: When I need to populate actionbar with new menu items, I call invalidateOptionsMenu(), then onCreateOptionsMenu is called and I can inflate menu that I need. :-)
for more info see http://developer.android.com/reference/android/app/Activity.html#invalidateOptionsMenu()
or
Change options menu during runtime - invalidateOptionsMenu()

That would trigger another call to onCreateOptionsMenu where you can decide to display a new menu. It's basically the right way of replacing the current menu with a new one.

When Activity is created then the onCreateOptionsMenu method is called. Inside you can inject menu from menu.xml ol build it by hand. But if you want to change this menu during activity life you must call invalidateOptionsMenu();
eg:
#Override
public boolean onCreateOptionsMenu(Menu menu) {
if (something) {
// buildOneMenu
} else {
// buildAnotherMenu
}
}
...
something = true;
invalidateOptionsMenu();

invalidateOptionsMenu() is used to say Android, that contents of menu have changed, and menu should be redrawn. For example, you click a button which adds another menu item at runtime, or hides menu items group. In this case you should call invalidateOptionsMenu(), so that the system could redraw it on UI. This method is a signal for OS to call onPrepareOptionsMenu(), where you implement necessary menu manipulations. Furthermore, OnCreateOptionsMenu() is called only once during activity (fragment) creation, thus runtime menu changes cannot be handled by this method.

What does onPrepareOptionsMenu do?

I want to make Option Menu for Android, I have visit this site. In their script, I found onPrepareOptionsMenu, I try to compile and run using Android 2.3.3 compiler with and without onPrepareOptionsMenu, both works, but I didn't see any difference.
public boolean onCreateOptionsMenu(Menu menu){
//code here
}
public boolean onOptionsItemSelected(MenuItem item){
//code here
}
public boolean onPrepareOptionsMenu(Menu menu){
//code here
}
What is actually onPrepareOptionsMenu method do? Is that method important? Could I just delete the method?
Addition
Oh, I also hear about Action Bar in Android 3.0, it says that Action Bar is the alternative way for make Option Menu, and it using onPrepareOptionsMenu. Is that right?
Thank you...

Take a look in the API:
Prepare the Screen's standard options menu to be displayed. This is called right before the menu is shown, every time it is shown. You can use this method to efficiently enable/disable items or otherwise dynamically modify the contents.

If you want to alter the menu before it's shown to the user, you can put code to do that into onPrepareOptionsMenu. I've used that dynamically to disable some menu options in some circumstances.
As an example of when one might want to disable a menu option, I had an app where there was a way of specifying a destination. One of my menu options was to calculate a route to the destination. However, if a destination wasn't specified, that option didn't apply, so I used onPrepareOptionsMenu to disable that menu option when it wasn't applicable.
From Android 3.0 and beyond, there's the ActionBar, which is a menu bar. The most important items go into the ActionBar itself, but then there's an overflow for when there's not enough room on the action bar. One can specify that menu items should always be in the overflow menu and never on the action bar itself. On some devices, the action bar overflow corresponds to the permanent menu button on the device, whereas on other devices which don't have a menu button the overflow menu is seen on the right hand side of the action bar as three vertical dots.

onCreateOptionsMenu is called once, when your activity is first created. If it returns false, no option menu is shown and onPrepareOptionsMenu is never called.
If onCreateOptionsMenu returns true, onPrepareOptionsMenu is also called before the activity is displayed, and also every time the options menu is invalidated. Use onPrepareOptionsMenu if you need to enable/disable, show/hide, or add/remove items after creating it.
If your menu does not change, use onCreateOptionsMenu.

example
#Override
public void onPrepareOptionsMenu(#NonNull Menu menu) {
super.onPrepareOptionsMenu(menu);
if(!URLUtil.isValidUrl(news.geturl())){
menu.findItem(R.id.share).setVisible(false);
}
}

Android: removing Sherlock Action Bar items for some classes

I'm having Sherlock Action Bar to show several icons in the Action Bar, like sharing, info, etc.
The thing is that I want to delete, for certain activities/fragments one of the buttons (sharing), but I can't do it.
My activity (StartActivity) extends from InfoActivity, which is the one that implements the onCreateOptionsMenu.
I tried to override the onCreateOptionsMenu method and do a clear() but it doesn't work:
#Override
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
super.onCreateOptionsMenu(menu, inflater);
}
Any ideas on how to do this?
Thanks a lot in advance.

Find the menu item in question and disable or hide it. Something like this in onCreateOptionsMenu() or onPrepareOptionsMenu() if you want to make it dynamic:
menu.findItem(R.id.menu_share).setVisible(false);

What I did in the end, was creating different classes: one with the Sharing button in the menu as a button, and one without, and just making the proper activity extend from the appropriate class.
For example, StartActivity, I don't want it to have sharing capabilities, so I made it extend from an Activity without the sharing button.
Thanks #NikolayElenkov for your help!