Android and callbacks (to be perfected)

Source: Internet
Author: User

A lot of callbacks are used in Android.

Each method of the activity's life cycle is being recalled by the system in a certain scenario. For example, if you click Back, the system will callback the activity's methods.

Then the widespread use of the event monitoring mechanism in Android is also the principle of callback, such as a button click event, when you click on the trigger, that is, only in the click of this scenario will trigger him.

Fragment was also full of callbacks,

Loader is also used for callbacks.

Android and callbacks (to be perfected)

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