Android 中点击后退按钮时的 onSaveInstanceState
我有一个在 Android 应用程序运行时调用的活动。当用户单击后退按钮时，Activity 被销毁，我重写了 onSaveInstanceState 方法来保存 outState 以供第二次检索，但 onSaveInstanceState当用户单击后退按钮时永远不会调用。
你知道为什么会发生这种情况吗？
I have an activity that is called at runtime in an Android App. When the user clicks the back button the Activity is destroyed and I overrode the onSaveInstanceState method to save outState to be retrieved in a second time but onSaveInstanceState is never called when the user clicks the back button.
Do you know why this happens?
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当用户按 BACK 时，不应调用
onSaveInstanceState()。当用户更改配置（例如，旋转屏幕）时，如果 Android 认为 Activity 有被破坏的风险，但仍可在堆栈上访问，或者可能还有其他一些情况，它将被调用。
onSaveInstanceState()is not supposed to be called when the user presses BACK.It will be called when the user changes configuration (e.g., rotates the screen), if Android believes that the activity is at risk of being destroyed while still being reachable on the stack, and perhaps a few other cases.