July 22,2016
Today i come to know about the event handling in the android.
Events are a useful way to collect data about a user’s interaction with interactive components of Applications. Like button presses or screen touch etc. The Android framework maintains an event queue as first-in, first-out (FIFO) basis. You can capture these events in your program and take appropriate action as per requirements.
Event Listeners & Event Handlers
| Event Handler | Event Listener & Description |
|---|---|
| onClick() | OnClickListener()
This is called when the user either clicks or touches or focuses upon any widget like button, text, image etc. You will use onClick() event handler to handle such event. |
| onLongClick() | OnLongClickListener()
This is called when the user either clicks or touches or focuses upon any widget like button, text, image etc. for one or more seconds. You will use onLongClick() event handler to handle such event. |
| onFocusChange() | OnFocusChangeListener()
This is called when the widget looses its focus ie. user goes away from the view item. You will use onFocusChange() event handler to handle such event. |
| onKey() | OnFocusChangeListener()
This is called when the user is focused on the item and presses or releases a hardware key on the device. You will use onKey() event handler to handle such event. |
| onTouch() | OnTouchListener()
This is called when the user presses the key, releases the key, or any movement gesture on the screen. You will use onTouch() event handler to handle such event. |
| onMenuItemClick() | OnMenuItemClickListener()
This is called when the user selects a menu item. You will use onMenuItemClick() event handler to handle such event. |
| onCreateContextMenu() | onCreateContextMenuItemListener()
This is called when the context menu is being built(as the result of a sustained “long click) |
There are many more event listeners available as a part of View class like OnHoverListener, OnDragListener etc which may be needed for your application. So I recommend to refer official documentation for Android application development in case you are going to develop a sophisticated apps.
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