React native Android：应用程序在其他活动中的状态

Question

我不希望我的应用程序要求pin后，用户采取了一张照片，所以我需要检测去相机活动不是背景状态。我要做什么？

注：1。它在ios 2上工作得很好。我尝试react native AppState在Android上没有“inactive”状态，但它不工作（这可能是因为我的应用程序usr react-native-navigation和MainActivity是extend SplashActivity）

Answer 1

我的解决办法是

(defn next-state [previous current]
  (case previous
    "in-other-app" (case current
                     "active" "back-from-other-app"
                     "inactive" "in-other-app"
                     "background" "in-other-app")
    "back-from-other-app" current
    current))

(def previous-state-atom (atom (.-currentState app-state)))
(defn add-app-state-listener [f]
  (.addEventListener app-state "change"
    (fn [state]
      (let [current-state (next-state @previous-state-atom state)]
        (f current-state)
        (reset! previous-state-atom current-state)))))

基本上，我会跟踪上一个状态，并使用该状态和下一个状态来触发自定义事件（即用字符串触发一个函数）

希望这能帮助到某人...

(defn mark-open-other-app!
  "!!!MUST CALL!!! before any call that results in the opening of another app
  like ImagePicker/showImagePicker or c/open-link."
  []
  (when (= :android (di/device))
    (reset! previous-state-atom "in-other-app")))

(defn cancel-open-other-app!
  "Api's like ImagePicker/showImagePicker can be cancelled in which case this function must be called to reset the app state"
  []
  (when (= :android (di/device))
    (reset! previous-state-atom "active")))