Develop Reference

How to change Menu Item icon from fragment?

How can I access my Menu from my fragment and then change the icon of one of the menu items there?
What I am doing is querying my local DB to see if a certain entry exists when the fragment is shown. If it does display a solid icon, if not, display an outlined icon.

In your fragments onCreate() method you can use setHasOptionsMenu(true) to allow your fragment to handle different menu items than it's root Activity.
So you could do something like this in your fragment:
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setHasOptionsMenu(true);
}
And then, you can override any of the menu life-cycle methods in your fragment:
#Override
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
super.onCreateOptionsMenu(menu, inflater);
inflater.inflate(R.menu.menu_fragment, menu);
// You can look up you menu item here and store it in a global variable by
// 'mMenuItem = menu.findItem(R.id.my_menu_item);'
}
#Override
public void onPrepareOptionsMenu(Menu menu) {
super.onPrepareOptionsMenu(menu);
MenuItem menuItem = menu.findItem(R.id.menu_item_to_change_icon_for); // You can change the state of the menu item here if you call getActivity().supportInvalidateOptionsMenu(); somewhere in your code
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
int id = item.getItemId();
// Handle actions based on the id field.
}

I found a simpler way of doing it than in the provided answer:
Toolbar toolbar = requireActivity().findViewById(R.id.toolbar);
Menu menu = toolbar.getMenu();
MenuItem item = menu.findItem(R.id.item_settings);
item.setIcon(R.drawable.ic_settings);
Access the menu from the toolbar.

Toolbar menu item programmatic click

I have this code
toolbar.setOnMenuItemClickListener(new Toolbar.OnMenuItemClickListener() {
#Override
public boolean onMenuItemClick(MenuItem item) {
openSearch();
return true;
}
});
into onCreate( ) of my Activity.
OpenSearch function call opens up google now like search view. This only happens when the user clicks on the search action item in the toolbar. In my case I want the search view to open up automatically when the activity starts. How can this menu item click be done programmatically.
I can't call openSearch directly because it needs the menu to be created.
Is there there any callbacks informing that action menus have been created ?

You can try something like this :
tollbarLayout.getViewTreeObserver().addOnGlobalLayoutListener(
new ViewTreeObserver.OnGlobalLayoutListener() {
#Override
public void onGlobalLayout() {
tollbarLayout.getViewTreeObserver().removeGlobalOnLayoutListener(this);
tollbar.performclick();
}
}
});

AppCompact v21 back navigation with fragment menu

So.. I'm facing a problem that has been driving me crazy for the past hours.
I have an App using the AppCompact v21 and toolbar. I also handle back navigation using:
getSupportActionBar().setDefaultDisplayHomeAsUpEnabled(true);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
getSupportActionBar().setHomeButtonEnabled(true);
In combination with the parent activity on the manifest. Which works perfect....
My problem is:
I have an activity with 3 tabs with a viewpager and I need one of the fragments to have it's own menu.
I can inflate the menu just fine but once the menu is inflated the back arrow in that fragment don't work anymore. In the other 2 fragments of the view pager the back navigation through the toolbar still works.
Inside my fragment:
// Inside onCreate...
this.setHasOptionsMenu(true);
// Later on somewhere else...
#Override
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
super.onCreateOptionsMenu(menu, inflater);
inflater.inflate(R.menu.menu_submit, menu);
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
super.onOptionsItemSelected(item);
// my menu logic goes here.
return true;
}
Any suggestions?

When you always return true in onOptionsItemSelected(), that means you've handled every menu item possible (including the Up button). You should instead return super.onOptionsItemSelected(item) in cases where you do not handle one of your items:
#Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
// Your menu logic such as
case R.id.your_menu_item:
// Do something
return true;
default:
return super.onOptionsItemSelected(item);
}
}

Android: Change menu item from Log in to Log out

My menu has a item to Log in, but when you are logged in I want it to say Log out.
How?
If I'm going to change the item after its created, its probably through this method
#Override
public boolean onCreateOptionsMenu( Menu menu ) {
MenuInflater inflater = getMenuInflater();
inflater.inflate( R.menu.menu_main, menu );
return true;
}
Afaik the onCreateOptionsMenu() happens after the onCreate so putting any getItemId() for the menu there will give me a NullPointerException right away.
I want the app to find out if its supposed to use the string R.string.Logout if its logged in.
I dont even know what to search for for this issue. All I found was how to make a string implement names, like this answer https://stackoverflow.com/a/7646689/3064486

You should use onPrepareOptionsMenu(Menu menu) instead to update menu items
#Override
public boolean onPrepareOptionsMenu(Menu menu){
super.onPrepareOptionsMenu(menu);
MenuItem someMenuItem = menu.findItem(R.id.some_menu_item);
someMenuItem.setTitle("Log out");
return super.onPrepareOptionsMenu(menu);
}
To refresh Menu items call invalidateOptionsMenu();from Activity
From Android API guides: "If you want to modify the options menu based on events that occur during the activity lifecycle, you can do so in the onPrepareOptionsMenu() method. This method passes you the Menu object as it currently exists so you can modify it, such as add, remove, or disable items. (Fragments also provide an onPrepareOptionsMenu() callback.)"

After you inflate a menu, you can customize its items. To get each one, you must call findItem() with the item's id. In particular, you can use setTitle() to change the displayed string.
For example:
#Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.main, menu);
if (mIsLoggedIn)
menu.findItem(R.id.action_login).setTitle("Log out");
return true;
}
where action_login is the id you set for this particular menu item in the menu's xml file.

private void updateUI() {
runOnUiThread(new Runnable() {
#Override
public void run() {
NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
Menu menu = navigationView.getMenu();
MenuItem nav_signin = menu.findItem(R.id.nav_signin);
nav_signin.setTitle(MyApp.signedIn ? "Sign out" : "Sign in");
}
});
}

Actionbar's overflow menu open/close listener

I want to listen when user opens/closes the overflow menu (three dots) of ActionBar, someway like this:
void onOverflowMenu(boolean expanded) {
}
To handle open cases, I've tried onPrepareOptionsMenu(), but it's triggered when ActionBar is constructed or when invalidateOptionsMenu() is called. This is not what I want.
I was able to detect overflow menu is closed if user selects a menu item in onMenuItemSelected(). But I also want to detect it if user closes overflow menu by tapping outside of it, by pressing back key, and all other cases.
Is there a way to implement that?

To catch open action in the Activity:
#Override
public boolean onMenuOpened(int featureId, Menu menu) {
...
return super.onMenuOpened(featureId, menu);
}
To catch closed action, also if user touch outside of Menu view:
#Override
public void onPanelClosed(int featureId, Menu menu) {
...
}

IMHO the simplest way is to set ActionBar.OnMenuVisibilityListener
ActionBar actionBar = getSupportActionBar();
if (actionBar != null) {
actionBar.addOnMenuVisibilityListener(new ActionBar.OnMenuVisibilityListener() {
#Override
public void onMenuVisibilityChanged(boolean isVisible) {
if (isVisible) {
// menu expanded
} else {
// menu collapsed
}
}
});
}