![]() But what is the mind or soul or concious of our App? Yes, it is the Activity.Īctivity is nothing but a java class in Android which has some pre-defined functions which are triggered at different App states, which we can override to perform anything we want.Īctivity class provides us with empty functions allowing us to be the controller of everything.įor example, if we have a function specified by our mind → onSeeingSomethingFunny(), although we know what happens inside this, but what if we can override and provide our own definition to this function. In case of Android → Views, Layouts and ViewGroups are used to design the user interface, which is the physical appearence of our App. So in a way, we can say that our body is just a physical object while what controls us through every situation is our mind(soul or concious). What happens to us in the real world physically(getting hurt, seeing, hearing etc) are intrepeted by our mind(concious or soul) and we think or operate as per. Human mind or concious is responsible for what we feel, what we think, makes us feel pain when we are hurt(physically or emotionally), which often leads to a few tears, laughing on seeing or hearing something funny and a lot more. In this tutorial we will leanr about one of the most important concept related to Android development, which is Activity. Android SDK Manager & required Packages. ![]() You can distinguish between these two scenarios with the isFinishing() method. Happen either because the activity is finishing (someone called finish() on it, orīecause the system is temporarily destroying this instance of the activity to save space. onDestroy() : The final call you receive before your activity is destroyed. This may happen either because a new activity is being started, an existing one is being brought in front of this one, or this one is being destroyed.Followed by either onRestart() if this activity is coming back to interact with the user, or onDestroy() if this activity is going away.ħ. onStop() : Called when the activity is no longer visible to the user, because anotherĪctivity has been resumed and is covering this one. OnStop() if it becomes invisible to the user.Ħ. Returns.Followed by either onResume() if the activity returns back to the front, or Must be very quick because the next activity will not be resumed until this method This is typically used to commit unsaved changes to persistent data,stop animationsĪnd other things that may be consuming CPU, etc. onPause() : Called when the system is about to start resuming a previous activity. Your activity is at the top of the activity stack, with user input going to it.ĥ. onResume() : Called when the activity will start interacting with the user. onStart() : Called when the activity is becoming visible to the user.įollowed by onResume() if the activity comes to the foreground, or onStop()Ĥ. onRestart() : Called after your activity has been stopped, prior to it being started again.ģ. You with a Bundle containing the activity's previously frozen state, if there was one.Ģ. ![]() Your normal static set up: create views, bind data to lists,etc. onCreate() : Called when the activity is first created. User, it must be completely restarted and restored to its previous state.ġ. If an activity is paused or stopped, the system can drop the activity from memory byĮither asking it to finish, or simply killing its process. The user so its window is hidden and it will often be killed by the system when memoryĤ. State and member information, however, it is no longer visible to If an activity is completely obscured by another activity, it is stopped. Remains attached to the window manager), but can be killed by the system in extremeģ. Paused activity is completely alive (it maintains all state and member information and If an activity has lost focus but is still visible (that is, a new non-full-sized or transparentĪctivity has focus on top of your activity), it is paused. If an activity in the foreground of the screen (at the top of the stack), it is active or running.Ģ.
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