OnCreate method with application flow and Toast

當Android App 程式啟動時，通常我們不需要去特別指定一個Application，系統層會自動創建一個Application 對象，啟動Application 後，系統會創建一個PID， ...

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On activity creation, the activity enters the Created state. In the onCreate() method, perform basic application startup logic that happens only once for the ...

Called when the application is starting, before any activity, service, or receiver objects (excluding content providers) have been created.

Called when the application is starting, before any activity, service, or receiver objects (excluding content providers) have been created.

Called when the application is starting, before any activity, service, or receiver objects (excluding content providers) have been created.

Called when the application is starting, before any activity, service, or receiver objects (excluding content providers) have been created.

The Application object is a singleton. It gets instantiated (and onCreate() is called) when the OS process hosting your app is created.

onCreate(): This is the first method called when the application is launched. It is where you can perform initialization tasks that need to be ...

onCreate() is the start of that lifecycle, it's where the Activity is created before being shown on screen. Like your professor suggests, it's a ...