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Жизненный цикл Activity?
onCreate() - создание
onStart() - появление на экране
onResume() - передача фокуса
onPause() - потеря фокуса
onStop() - исчезновение с экрана
onDestroy() - уничтожение
Про onRestart() могут спросить, но оно редко используется. Вызывается перед onStart(), когда активити было закрыто, но не уничтожено. Проще говоря, оно вызывается между onStop() и onStart().
Наверно понятно.
Usually when I create an Android service I implement the onCreate method, but in my last project this does not work. I tried implementing onStartCommand, and this seems to work. The question is: ...
original source : http://stackoverflow.com/questions/14182014/android-oncreate-or-onstartcommand-for-starting-service
onCreate() is called when the Service object is instantiated (ie: when the service is created). You should do things in this method that you need to do only once (ie: initialize some variables, etc.). onCreate() will only ever be called once per instantiated object.
You only need to implement onCreate() if you actually want/need to initialize something only once.
onStartCommand() is called every time a client starts the service using startService(Intent intent). This means that onStartCommand() can get called multiple times. You should do the things in this method that are needed each time a client requests something from your service. This depends a lot on what your service does and how it communicates with the clients (and vice-versa).
If you don't implement onStartCommand() then you won't be able to get any information from the Intent that the client passes to onStartCommand() and your service might not be able to do any useful work.
Resolved: Android activity life cycle - what are all these methods for? #fix #programming #solution
Resolved: Android activity life cycle – what are all these methods for? #fix #programming #solution
Android activity life cycle – what are all these methods for?
What is the life cycle of an Android activity? Why are so many similar sounding methods (onCreate(), onStart(), onResume()) called during initialization, and so many others (onPause(), onStop(), onDestroy()) called at the end?
When are these methods called, and how should they be used properly?
Answer [by Masiar]: Android activity…
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How to: Start an Activity with a parameter
How to: Start an Activity with a parameter
Start an Activity with a parameter
I’m very new on Android development.
I want to create and start an activity to show information about a game. I show that information I need a gameId.
How can I pass this game ID to the activity? The game ID is absolutely necessary so I don’t want to create or start the activity if it doesn’t have the ID.
It’s like the activity has got only oneconstructor with…
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How to: Android activity life cycle - what are all these methods for?
How to: Android activity life cycle – what are all these methods for?
Android activity life cycle – what are all these methods for?
What is the life cycle of an Android activity? Why are so many similar sounding methods (onCreate(), onStart(), onResume()) called during initialization, and so many others (onPause(), onStop(), onDestroy()) called at the end?
When are these methods called, and how should they be used properly?
Answer: Android activity life cycle –…
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[Android] Activity LifeCycles and that weird savedInstanceState
You'll notice that when you first create an Activity you will have an onCreate() method where you pass a savedInstanceState. What is the savedInstanceState all about???
An Activity has a lifecycle of different states.
onCreate --> will be called when the activity is created for the first time
onPause --> will be called just before the current activity is about to be paused, to switch to either another activity or a different app. For example, when you get a phone call in the middle of your app activity, onPause() will be called.
onResume --> will be called after onPause() was called and just before the activity is resumed (i.e., when you return from the phone call)
onDestroy --> this is an important one and needs to be handled appropriately.onDestroy is called just before your app session is about to be entirely destroyed by the system, meaning all app session data will be deleted (an exception to this is widget data, that will be retained through a destroy). Typically, when the system's memory is getting tight, the system may go through all the apps running in the background and destroy your app's session. Again, just before the system is about to destroy your app, it will send a message to your app to call two methods:onSavedInstanceState() and onDestroy(). What a nice warning! So here's your chance to save any 'state' related data. For example, you may want to save instance variables in your activity, like user selections or text entries (note, for more persistant data like user attributes, you'll want to use a SQL database to store the data across sessions).
*** Tricky *** Screen rotations and pulling out the keyboard on some devices will also cause an activity to be destroyed by default. So you also need to handle these cases.
So, how do you save this stuff?
We will use the onSavedInstanceState method and create something called a Bundle, which is basically a set of name-value pairs. This bundle will then be passed to onCreate to be resurrected, when the app is restored. Here's an example.
