Add android app state events "blur", "focus" (#42423)

* fix: add android app state events

* trigger ci

* remove trailing space

types/react-native/index.d.ts

@@ -33,6 +33,7 @@
 //                 Daiki Ihara <https://github.com/sasurau4>
 //                 Abe Dolinger <https://github.com/256hz>
 //                 Dominique Richard <https://github.com/doumart>
+//                 Mohamed Shaban <https://github.com/drmas>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
 // TypeScript Version: 2.8
 
@@ -6875,22 +6876,27 @@ export interface AlertStatic {
 export type AlertType = 'default' | 'plain-text' | 'secure-text' | 'login-password';
 
 /**
- * AppStateIOS can tell you if the app is in the foreground or background,
+ * AppState can tell you if the app is in the foreground or background,
  * and notify you when the state changes.
  *
- * AppStateIOS is frequently used to determine the intent and proper behavior
+ * AppState is frequently used to determine the intent and proper behavior
  * when handling push notifications.
  *
- * iOS App States
+ * App State Events
+ *      change - This even is received when the app state has changed.
+ *      focus [Android] - Received when the app gains focus (the user is interacting with the app).
+ *      blur [Android] - Received when the user is not actively interacting with the app.
+ *
+ * App States
  *      active - The app is running in the foreground
  *      background - The app is running in the background. The user is either in another app or on the home screen
- *      inactive - This is a transition state that currently never happens for typical React Native apps.
+ *      inactive [iOS] - This is a transition state that currently never happens for typical React Native apps.
  *
  * For more information, see Apple's documentation: https://developer.apple.com/library/ios/documentation/iPhone/Conceptual/iPhoneOSProgrammingGuide/TheAppLifeCycle/TheAppLifeCycle.html
  *
- * @see https://facebook.github.io/react-native/docs/appstateios.html#content
+ * @see https://facebook.github.io/react-native/docs/appstate#app-states
  */
-export type AppStateEvent = 'change' | 'memoryWarning';
+export type AppStateEvent = 'change' | 'memoryWarning' | 'blur' | 'focus';
 export type AppStateStatus = 'active' | 'background' | 'inactive';
 
 export interface AppStateStatic {

types/react-native/test/index.tsx

@@ -372,6 +372,8 @@ function appStateListener(state: string) {
 function appStateTest() {
     console.log("Current state: " + AppState.currentState);
     AppState.addEventListener("change", appStateListener);
+    AppState.addEventListener("blur", appStateListener);
+    AppState.addEventListener("focus", appStateListener);
 }
 
 // ViewPagerAndroid