> For the complete documentation index, see [llms.txt](https://sketchwaredocs.gitbook.io/home/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://sketchwaredocs.gitbook.io/home/events.md). # Events Events are Triggers which occurs when user open, close, press button, long click button, download completion etc. ## Activity Source: ![Activity Life-cycle (Pic. 9)](https://1589143646-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-M3AlXnP5kHENnvBXdKq%2F-M56xBG3b3LqOTjTJybR%2F-M579PaYWJwGOFDX76UT%2Factivity_life_cycle.png?alt=media\&token=34589e9f-6972-41b8-9556-40878b003379) ### onCreate This is the event, when app is started. This is a good place to initialize any data such as variables or lists. In Sketchware, this event is provided by default. ### onBackPressed As the name suggests, the blocks in this event will run when back button is pressed from your phone. ### onStart This event occurs when you open/reopen the activity. See the Pic.9 for more details. ### onPostCreate This event is called when activity start-up or onStart is complete. ### onResume This event is called whenever the user returns to the activity after leaving the activity — such as receiving a call, pressing the home button, turning off the screen, or transitioning to another activity. ### onPause This event occurs when the user is leaving your activity. ### onStop When your activity is no longer visible to the user. This is usually a good point to pause any ongoing process, such as MediaPlayer or SoundPool. ### onDestroy When the activity is closed, this will last event of Activity. It also occurs when somebody close the app correctly. (Force close can be exception) ## View ### onClick A simple Event when that specific widget is clicked. ### onTextChanged Whenever the text in 'edittext' is changed. {% hint style="success" %} **onTextChanged** also occurs when you set text by using blocks {% endhint %} ### onCheckChanged This event occurs when the value of Checkbox/Switch is changed. {% hint style="success" %} **onCheckChanged** also occurs when you change check by using blocks {% endhint %} ![An Example (Pic. 10)](https://1589143646-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-M3AlXnP5kHENnvBXdKq%2F-M57Lx38ojyLlQdBoV0p%2F-M57MHGPjzfdOajt_89t%2Fcheck_uncheck.jpg?alt=media\&token=b65ba456-17a3-4839-9c9f-7ab69beb4690) ### onProgressChanged This event occurs when progress is changed for seekbar. (Only for Seekbar) ### onStartTrackingTouch This event occurs when the user holds the seekbar to change it. (Only for Seekbar) ### onStopTrackingTouch This event occurs when the user stop holding the seekbar when he is done. (Only for Seekbar) MAPVIEW will be added soon. ### onDateChange This event occurs when the user selects a date in a CalendarView. (Only for CalendarView)