Android life cycle turn off device10/13/2023 ![]() OnCreate()/ onStart()/ onResume() : the Activity started OnStart()/ onResume() : the Activity resumes because GameActivity Activity has finished OnStop() : the Activity is stopped because GameActivity Activity is visible OnPause() : the Activity is paused, because the GameActivity Activity is starting OnCreate()/ onStart()/ onResume() : the Activity is starting This will prevent you from seeing all the logs generated by the system Select the name of the emulator or the name of your device, and choose the name of your TopQuiz process from the drop downįilter the logs by typing System.out in the search box. Select the Android Monitor tab at the bottom left of Android Studio ![]() You should see this in your console: Android's Logcat Launch the application, press the button to start a new game, play it until the end, and wait until you return to the main screen. As a reminder, this is how you display a log statement in Java (we will learn how to use the Android-specific one later): ("MainActivity :: onStart()") To understand the sequence of these methods, override them in your two Activities, and display their call in the console. That's a lot to take in, we know! Let's clarify things by putting this into practice. This method will be called after the finish() method, or if the system decides to terminate the activity to free up memory. This method is called when the Activity is removed from the Activity stack. Work done in this method can be more mission critical (such as saving values in SharedPreferences, for example). Code related to GUI updates should be stopped here. In the Stopped state, the Activity is no longer visible. The work you do in this method should consume as little time as possible to prevent the user from getting stuck in your Activity. For example, if you start an animation in onResume() , you should stop it in onPause() . In the Paused state, anything initiated in onResume() must be paused in this method. The application remains in this state until something interrupts it, such as receiving a phone call, starting a new Activity, or displaying a dialog box. The user can use the application and click on graphic elements. In the Resumed state, the Activity becomes fully operational. At this point, the interface is visible to the user, but they can't interact with it yet. This method is called by the system when the Activity enters the Started state. We will make its purpose more clear below.Īt this point, the Activity is already created, but the user can't see it, yet and cannot interact with it. ![]() This variable contains the last saved status of the Activity. You may have noticed that this method takes a parameter which is a savedInstanceState variable of type Bundle. Generally, we use this opportunity to set up the GUI, initialize variables, configure listeners, and connect to the model. This method, which you already know, is called when your Activity is created by the system and enters the Created state. But as you can see from the diagram above, there are others which we will now discover. Here are the different states in which an Activity can be found: In Android, an activity passes through different states, between which the system calls specific methods in a specific orderīy default, the onCreate() method is automatically overloaded when you create a new Activity. You already know one of these methods: onCreate(). Between each state, the system calls specific methods, in a specific order. On Android, an Activity also passes through different states. Throughout the day, you move from one state to another. Then, when you get up and prepare to go to work, you go from an awakened state to an operational state. When your alarm clock rings in the morning, you switch from a sleeping state to an awake state. While it'll seem a bit abstract at first (diagrams!), it's an incredibly important topic that every Android developer gets the hang of. In this chapter, we're going to take a look at the life cycle of an Activity.
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