What is onCreateOptionsMenu () in android?
In this method, you can inflate your menu resource (defined in XML) into the Menu provided in the callback. For example: @Override public boolean onCreateOptionsMenu(Menu menu) { MenuInflater inflater = getMenuInflater(); inflater.inflate(R.menu.game_menu, menu); return true; }
Why do we need to call setContentView () in onCreate () of activity class?
As onCreate() of an Activity is called only once, this is the point where most initialization should go: calling setContentView(int) to inflate the activity’s UI, using findViewById to programmatically interact with widgets in the UI, calling managedQuery(android.
What is the use of getMenuInflater in Android?
You use it to get a MenuInflater . A MenuInflater can “inflate” menu resources, converting the XML representation into a tree of Menu and MenuItem objects. In turn, those objects are used to populate things like the action bar and Toolbar widgets.
What are spinners in android application?
Spinners provide a quick way to select one value from a set. In the default state, a spinner shows its currently selected value. Touching the spinner displays a dropdown menu with all other available values, from which the user can select a new one.
How do I use MenuInflater?
A MenuInflater is an object that is able to create Menu from xml resources (of course only menus resources), that is : construct a new instance of Menu given a menu resource identifier. The onCreateOptionMenu(Menu) is called when the menu button of the device is pressed, or either Activity. openOptionsMenu() is called.
What are spinners in Android application?
What is the purpose of setContentView?
SetContentView is used to fill the window with the UI provided from layout file incase of setContentView(R. layout. somae_file). Here layoutfile is inflated to view and added to the Activity context(Window).
What is difference between onViewCreated and onCreateView?
onCreate() is called to do initial creation of the fragment. onCreateView() is called by Android once the Fragment should inflate a view. onViewCreated() is called after onCreateView() and ensures that the fragment’s root view is non-null .
What is the use of Menulnflater class *?
This class is used to instantiate menu XML files into Menu objects. For performance reasons, menu inflation relies heavily on pre-processing of XML files that is done at build time.
What is difference between ListView and spinner in Android?
Spinners provide a quick way to select one value from a set. In the default state, a spinner shows its currently selected value. Touching the spinner displays a dropdown menu with all other available values, from which the user can select a new one. ListView is a view group that displays a list of scrollable items.
What is context menu android?
A context menu is a floating menu that appears when the user performs a long-click on an element. It provides actions that affect the selected content or context frame.
What is the use of FindViewById in Android?
FindViewById(Int32) Finds a view that was identified by the id attribute from the XML layout resource.
What does oncreateoptionsmenu do in Android?
You use onCreateOptionsMenu () to specify the options menu for an activity. In this method, you can inflate your menu resource (defined in XML) into the Menu provided in the callback. How do I use onCreateOptionsMenu in activity? (Activity) param.thisObject. What is Android overflow menu?
How to create options menu in Android apps?
You can also add menu items using add() and retrieve items with findItem() to revise their properties with MenuItem APIs. If you’ve developed your application for Android 2.3.x and lower, the system calls onCreateOptionsMenu() to create the options menu when the user opens the menu for the first time.
What is onprepareoptionsmenu () in Android?
On Android 2.3.x and lower, the system calls onPrepareOptionsMenu () each time the user opens the options menu (presses the Menu button). On Android 3.0 and higher, the options menu is considered to always be open when menu items are presented in the app bar.
How do I create a pop up menu in Android?
See the section about Creating a Popup Menu. For all menu types, Android provides a standard XML format to define menu items. Instead of building a menu in your activity’s code, you should define a menu and all its items in an XML menu resource. You can then inflate the menu resource (load it as a Menu object) in your activity or fragment.