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"Adding Callbacks From Fragment To Activity Or Activity To Application In Android" @ http://blog.jakelee.co.uk/2018/10/22/adding-callbacks-from-fragment-to-activity-or-activity-to-application-in-android
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interface ActionHandler { | |
fun handleAction(actionCode: String) | |
} |
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companion object { | |
const val FRAGMENT_A_CLOSED = "com.example.fragment_a_closed" | |
} | |
fun closeFragment() { | |
try { | |
(activity as ActionHandler).handleAction(FRAGMENT_A_CLOSED) | |
} catch (e: ClassCastException) { | |
Timber.e("Calling activity can't get callback!") | |
} | |
dismiss() | |
} |
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class MainActivity: ActionHandler { | |
override fun handleAction(actionCode: String) { | |
when { | |
actionCode == FragmentA.FRAGMENT_A_CLOSED -> { | |
doSomething() | |
} | |
actionCode == FragmentB.FRAGMENT_B_CLOSED -> { | |
doSomethingElse() | |
} | |
actionCode == FragmentC.FRAGMENT_C_CLOSED -> { | |
doAnotherThing() | |
} | |
} | |
} | |
// Usual activity setup code snipped | |
} |
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