12/7/2023 0 Comments Android life cycle pic![]() Joe brings that same passion to How-To Geek. Android lifecycle - Download as a PDF or view online for free. Introduction to Android Development Aly Abdelkareem. If something piques his interest, he will dive into it headfirst and try to learn as much as possible. 04 activities and activity life cycle Sokngim Sa. Outside of technology, Joe is an avid DIYer, runner, and food enthusiast. After several years of jailbreaking and heavily modifying an iPod Touch, he moved on to his first smartphone, the HTC DROID Eris. He got his start in the industry covering Windows Phone on a small blog, and later moved to Phandroid where he covered Android news, reviewed devices, wrote tutorials, created YouTube videos, and hosted a podcast.įrom smartphones to Bluetooth earbuds to Z-Wave switches, Joe is interested in all kinds of technology. He has written thousands of articles, hundreds of tutorials, and dozens of reviews.īefore joining How-To Geek, Joe worked at XDA-Developers as Managing Editor and covered news from the Google ecosystem. Joe loves all things technology and is also an avid DIYer at heart. He has been covering Android and the rest of the Google ecosystem for years, reviewing devices, hosting podcasts, filming videos, and writing tutorials. An activity can frequently go between the resumed and paused states - for example when the device goes to sleep, when an activity result is delivered, when a new intent is delivered - so the code in these methods should be fairly lightweight.Joe Fedewa has been writing about technology for over a decade. During this time the activity is in front of all other activities and interacting with the user. The foreground lifetime of an activity happens between a call to onResume() until a corresponding call to onPause(). The onStart() and onStop() methods can be called multiple times, as the activity becomes visible and hidden to the user. For example, you can register a BroadcastReceiver in onStart() to monitor for changes that impact your UI, and unregister it in onStop() when the user no longer sees what you are displaying. Between these two methods you can maintain resources that are needed to show the activity to the user. Apps only pause (via onPause ()) in a few specific. Apps use onResume () when returned to focus after another event. During this time the user can see the activity on-screen, though it may not be in the foreground and interacting with the user. onDestroy onCreate () is called when the activity is first brought to life. The visible lifetime of an activity happens between a call to onStart() until a corresponding call to onStop(). For example, if it has a thread running in the background to download data from the network, it may create that thread in onCreate() and then stop the thread in onDestroy(). An activity will do all setup of "global" state in onCreate(), and release all remaining resources in onDestroy(). The entire lifetime of an activity happens between the first call to onCreate(Bundle) through to a single final call to onDestroy(). There is good description in the official Android documentation: Log.Debug("OnDestroy", "OnDestroy called, App is Terminating") Log.Debug("OnStop", "OnStop called, App is in the background") Log.Debug("OnPause", "OnPause called, App is moving to background") Log.Debug("OnResume", "OnResume called, app is ready to interact with the user") Log.Debug("OnStart", "OnStart called, App is Active") Set our view from the "main" layout resource Log.Debug("OnCreate", "OnCreate called, Activity components are being created") Protected override void OnCreate(Bundle savedInstanceState) In the mobile application you have of course methods in each Activity class that handle specific lifecycle fragment: [Activity(Label = "LifecycleApp", MainLauncher = true, Icon = class MainActivity : Activity On the diagram below you can see how Android Activity lifecycle looks like:Īs you can see there is specific flow of Activity lifecycle. As you know Activity is single page in the Android app where user can perform interaction with it. Activity lifecycle is quite more complex.
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