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Unformatted text preview:   Periodically call event loop in handler (reentrancy adds complexity). •  Can't maintain local state across events (handler must return). •  No CPU concurrency (not suitable for scien7fic apps). •  Event- driven I/O not always well supported (e.g. poor write buffering). COMP 4521 (Muppala) Android UI Overview 22 Handling UI Events in Android UI Events in Android •  More than one way to intercept the events from a user’s interac7on with the applica7on –  Public callback methods available to handle UI events –  Called by the Android framework when the respec7ve ac7on occurs on that object –  Event listeners: collec7on of nested interfaces with callbacks –  Event handlers: more suitable for custom view classes COMP 4521 (Muppala) Android UI Overview 24 Event Listeners •  Interface in the View class that contains a single callback method •  Called by the Android framework when the View to...
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This document was uploaded on 03/12/2014.

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