didChangeAppLifecycleState method

@override void didChangeAppLifecycleState(AppLifecycleState state)

Called when the system puts the app in the background or returns the app to the foreground.

An example of implementing this method is provided in the class-level documentation for the WidgetsBindingObserver class.

This method exposes notifications from SystemChannels.lifecycle.

See also:

• AppLifecycleListener, an alternative API for responding to application lifecycle changes.

Implementation

@override
void didChangeAppLifecycleState(AppLifecycleState state) {
  super.didChangeAppLifecycleState(state);

  switch (state) {
    case AppLifecycleState.inactive:
      //  应用程序处于闲置状态并且没有收到用户的输入事件。
      //注意这个状态，在切换到后台时候会触发，所以流程应该是先冻结窗口，然后停止UI
      if (Get.currentRoute.contains(widget.runtimeType.toString())) {
        onBackHome();
      }
      break;
    case AppLifecycleState.paused:
//      应用程序处于不可见状态
      if (Get.currentRoute.contains(widget.runtimeType.toString())) {
        onPause();
      }

      break;
    case AppLifecycleState.resumed:
      //    进入应用时候不会触发该状态
      //  应用程序处于可见状态，并且可以响应用户的输入事件。它相当于 Android 中Activity的onResume。
      if (Get.currentRoute.contains(widget.runtimeType.toString())) {
        onResume();
      }

      break;
    case AppLifecycleState.detached:
      //当前页面即将退出
      if (Get.currentRoute.contains(widget.runtimeType.toString())) {
        onDetach();
      }

      break;
  }
}