FIX: Call all android back key handlers before invoking default

Kevin Han · Facebook Github Bot · commit b4283ed84450 · 2016-11-11T00:28:40.000-08:00
Summary: Fixes issue #9736 Closes #9757 Differential Revision: D4164796 Pulled By: hramos fbshipit-source-id: c5d966a9bbaa91f9929ea20a775f96c15aa9f482
diff --git a/Libraries/Utilities/BackAndroid.android.js b/Libraries/Utilities/BackAndroid.android.js
@@ -41,6 +41,8 @@ RCTDeviceEventEmitter.addListener(DEVICE_BACK_EVENT, function() {
 /**
  * Detect hardware back button presses, and programmatically invoke the default back button
  * functionality to exit the app if there are no listeners or if none of the listeners return true.
+ * The event subscriptions are called in reverse order (i.e. last registered subscription first),
+ * and if one subscription returns true then subscriptions registered earlier will not be called.
  *
  * Example:
  *

Original file line number	Diff line number	Diff line change
`@@ -41,6 +41,8 @@ RCTDeviceEventEmitter.addListener(DEVICE_BACK_EVENT, function() {`
`41`	`41`	`/**`
`42`	`42`	`* Detect hardware back button presses, and programmatically invoke the default back button`
`43`	`43`	`* functionality to exit the app if there are no listeners or if none of the listeners return true.`
	`44`	`+ * The event subscriptions are called in reverse order (i.e. last registered subscription first),`
	`45`	`+ * and if one subscription returns true then subscriptions registered earlier will not be called.`
`44`	`46`	`*`
`45`	`47`	`* Example:`
`46`	`48`	`*`