What Is FindViewById?

What is Android padding?

Padding is the space inside the border, between the border and the actual view’s content.

Note that padding goes completely around the content: there is padding on the top, bottom, right and left sides (which can be independent)..

What is r in Kotlin?

R is a static class R. it created when you create resource and build it. It have all resource ID as Static for you application access all resource in your activity.

How do you show toast in Kotlin?

Kotlin Android ToastToast. makeText(applicationContext,”this is toast message”,Toast. LENGTH_SHORT). … val toast = Toast. makeText(applicationContext, “Hello Javatpoint”, Toast. LENGTH_LONG)toast. show()val myToast = Toast. makeText(applicationContext,”toast message with gravity”,Toast. … myToast. setGravity(Gravity. … myToast. show()

What is setContentView?

Actually setContentView() is a method part of android. app. Activity class. It helps to set our content or render our layout on the screen. Based on the value given by the user, views will be inflated and rendered after the measurement of the screen, root view, and its child views.

What is Finishaffinity Android?

1. 22. In Android, all activities are managed in a Task Stack. The affinity is used to group activities under a specific task stack. In general, the affinity indicates in which task an activity prefers or belongs to.

What is the difference between onCreate and onStart Android?

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

Is it possible activity without UI in Android?

The answer is yes it’s possible. Activities don’t have to have a UI. It’s mentioned in the documentation, e.g.: An activity is a single, focused thing that the user can do.

Which is best layout in Android?

Constraint layout the best layout ever! The constraint layout was first figured out at Google I/O 2016 aiming to introduce auto layout for android, what it is actually and how it’s going to impact layout designing.

How do I find my kotlin ID Android?

You can directly get the view by the id specified in the layout. For example: We define id for Toolbar in the layout as android:id=”+@id/toolbar” then we can play with Toolbar using the same id in Kotlin code.

What is the use of setTag in Android?

setTag(int, Object) would store the objects in a static map, where the values were strongly referenced. This means that if the object contains any references pointing back to the context, the context (which points to pretty much everything else) will leak.

How do you kill an activity?

Yes, all you need to do is call finish() in any Activity you would like to close. You can also add android:noHistory=”true” to your Activity tag in AndroidManifest.

What is onCreate?

onCreate(Bundle) is where you initialize your activity. When Activity is started and application is not loaded, then both onCreate() methods will be called. But for subsequent starts of Activity , the onCreate() of application will not be called.

What is findViewById () method used for?

This method returns a View object. All the views such as Button , TextView , ImageView , RelativeLayout , LinearLayout etc. extends/inherits ViewGroup class, which in turn extends View class. Thus, all the views used in the XML Layout, one way or other extends to View class.

How do I use Kotlin findViewById?

Design mode in Android Studio. The same layout is opened in Text mode below. To access the TextView we need to use findViewById() and pass in the TextView ‘s id attribute.

How do you use Viewbinding?

Use view binding in activitiesCall the static inflate() method included in the generated binding class. … Get a reference to the root view by either calling the getRoot() method or using Kotlin property syntax.Pass the root view to setContentView() to make it the active view on the screen.