![]() Why would you do the setContentView() in onCreate() of Activity class?Īs onCreate() of an Activity is called only once, this is the point where most initialisation should go. If finish() is called in the OnCreate method of an activity, the system will invoke onDestroy() method directly. Scenario in which only onDestroy is called for an activity without onPause() and onStop()? The onStart() method is called whenever the Activity becomes visible to the user, typically after onCreate() or onRestart().ġ1.The onCreate() method is called once during the Activity lifecycle, either when the application starts, or when the Activity has been destroyed and then recreated, for example during a configuration change.What’s the difference between onCreate() and onStart()? OnRestart() : Called after your activity has been stopped, prior to it being started againġ0.OnDestroy() : Called when the activity is finishing.OnStop() : Called when you are no longer visible to the user.OnPause() : Called as part of the activity lifecycle when an activity is going into the background, but has not (yet) been killed.At this point your activity is at the top of the activity stack, with user input going to it. OnResume() : Called when the activity will start interacting with the user.Followed by onResume() if the activity comes to the foreground, or onStop() if it becomes hidden. OnStart() : Called when the activity is becoming visible to the user.This is normally where we create views, get data from bundles etc. OnCreate() : This is when the view is first created.Content Providers − It will share the data between applicationsĪctivities are basically containers or windows to the user interface.Notification − light, sound, icon, notification, dialog box and toast.Resource Externalization − strings and graphics.Intent − It will perform the inter connection between activities and the data passing mechanism.Services − It will perform background functionalities.What is the Android Application Architecture?Īndroid application architecture has the following components: The final step involves the android apkbuilder which takes all the input and builds the apk (android packaging key) file.ħ.class files by javac, and then the class files are converted to Dalvik bytecode by the “dx” tool, which is included in the sdk ‘tools’. ![]()
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