Quick Answer: What is onCreate bundle savedInstanceState in Android?

What is the use of bundle savedInstanceState in Android?

The savedInstanceState is a reference to a Bundle object that is passed into the onCreate method of every Android Activity. Activities have the ability, under special circumstances, to restore themselves to a previous state using the data stored in this bundle.

What is the purpose of onCreate () function in Android?

onCreate(Bundle savedInstanceState) Function in Android:

After Orientation changed then onCreate(Bundle savedInstanceState) will call and recreate the activity and load all data from savedInstanceState. Basically Bundle class is used to stored the data of activity whenever above condition occur in app.

What is the use of the onCreate method?

My research ::

  1. onCreate is used to start an activity.
  2. super is used to call the parent class constructor.
  3. setContentView is used to set the xml.

What is the use of super onCreate savedInstanceState?

By calling super. onCreate(savedInstanceState); , you tell the Dalvik VM to run your code in addition to the existing code in the onCreate() of the parent class. If you leave out this line, then only your code is run. The existing code is ignored completely.

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What is the difference between onCreate and onStart activity?

onCreate() is called when the when the activity is first created. onStart() is called when the activity is becoming visible to the user.

Why is savedInstanceState null?

The logs always show the “bundle save” tag. But in onCreate method, SavedInstanceState is always null. you need to call super. onSaveInstanceState(savedInstanceState) before adding your values to the Bundle, or they will get wiped out on that call (Droid X Android 2.2).

What happens in onCreate?

In the onCreate() method, you perform basic application startup logic that should happen only once for the entire life of the activity. For example, your implementation of onCreate() might bind data to lists, associate the activity with a ViewModel , and instantiate some class-scope variables.

What does the @override do above the onCreate method?

@Override is an annotation that will throw a compilation error if the signatures of the methods don’t match (for example if you omit the parameter savedInstanceState) and that’s how an overridden method is marked.

What is the purpose of super onCreate () in Android Mcq?

Q 9 – What is the purpose of super. onCreate() in android? The super. onCreate() will create the graphical window for subclasses and place at onCreate() method.

What is the use of onResume method in Android?

onResume() is called whenever you navigate back to the activity from a call or something else. You can override the onResume method similarly as onCreate() and perform the task. This may help you understand the lifecycle of and Android app more.

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How do you call onCreate?

If you want to call some code that is inside your onCreate then move that code to some function named onCreateHelper and call both from your onCreate and from all other places you need.

What does finish () do in Android?

On Clicking the back button from the New Activity, the finish() method is called and the activity destroys and returns to the home screen.