Android interaction experience required: function button events

BKJIA exclusive translation this article is translated from the foreign language website tutsplus.com "Android interactive experience must know: function button event". All translations are as follows:

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Each Android device generally provides physical function buttons except letters and numbers, which are generally different from those of different Android manufacturers, for example, Sony only implements three of these function buttons. If these buttons are well designed, they can provide a good interactive experience for the apps being developed.

Android applications are mainly designed based on Activities. I believe most developers are familiar with this design and can learn it in the Official development manual. Today, we are going to learn how to implement the KeyEvent. Callback interface to redefine the function buttons on Android devices and serve our applications.

Constant definition and method of function buttons

The KeyEvent class has multiple defined key constants, which indicate the function buttons in a standard Android device:

Function buttons	Constant Definition	Description
Power	KEYCODE_POWER	Enable or wake up a device
Back	KEYCODE_BACK	Back to the previous page)
Home	KEYCODE_HOME	Return to the main menu screen)
SEARCH	KEYCODE_SEARCH	Open a search
CAMERA	KEYCODE_CAMERA	Enable camera function
VOLUME	KEYCODE_VOLUME_UP KEYCODE_VOLUME_DOWN	Adjust volume

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