What is the activity life cycle?

What is the activity life cycle?

Activity Lifecycle: Activity is one of the building blocks of Android OS. In simple words Activity is a screen that user interact with. Every Activity in android has lifecycle like created, started, resumed, paused, stopped or destroyed. These different states are known as Activity Lifecycle.

What is an intent object?

An Intent object carries information that the Android system uses to determine which component to start (such as the exact component name or component category that should receive the intent), plus information that the recipient component uses in order to properly perform the action (such as the action to take and the …

What is the difference between activity and AppCompatActivity?

The differences between them are: Activity is the basic one. Based on Activity , FragmentActivity provides the ability to use Fragment . Based on FragmentActivity , AppCompatActivity provides features to ActionBar .

What is main activity?

The “main” activity is the activity that loads first and the rest of your application. Every application can have multiple activities, therefore you can list other activities to load and use later on but you can only have one “main” activity.

What is 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.

What is an example of Intent?

Intent is defined as something you plan or mean to do. An example of intent is when a politician means to become president. The definition of intent is being focused on something. An example of intent is when you are planning to visit your mother.

How do you create an Intent object?

Intent Example In Android:

1. Step 1: Let’s design the UI of activity_main. xml:
2. Step 2: Design the UI of second activity activity_second.xml.
3. Step 3: Implement onClick event for Implicit And Explicit Button inside MainActivity.java.
4. Step 4: Create A New JAVA class name SecondActivity.
5. Step 5: Manifest file:

What is onattachedtowindow () in Android?

This is called when the view is attached to a window. Java documentation for android.view.View.onAttachedToWindow (). Portions of this page are modifications based on work created and shared by the Android Open Source Project and used according to terms described in the Creative Commons 2.5 Attribution License.

How to use contextmenu in listview?

Open the context menu of the view within the event handler for the long press event on the row view. This way both the click on the view and the long press context menu works on the listview row item. Show activity on this post. You actually dont need to use longClickListener with your listview to use ContextMenu. Hope it will help you.

What is the difference between onresume () and oncreate () methods?

If the user returns to the activity, the onResume () method is called again. 4b. the app process can be killed from the paused state if apps with higher priority need memory. If the user needs to return to app after it is killed, the onCreate () method is called again

What is the difference between oncreate and ondestroy?

The onDestroy () method releases all resources that have not yet been released by earlier methods such as onStop (). The entire lifetime of an activity happens between the first call to onCreate () through a single final call to onDestroy (). The visible lifetime of an activity happens between a call to onStart () until a call to onStop ().