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https://developer.android.com/reference/android/window/SystemOnBackInvokedCallbacks?authuser=1 SystemOnBackInvokedCallbacks | API reference | Android Developers api reference android developers https://developer.android.google.cn/reference/android/window/SystemOnBackInvokedCallbacks SystemOnBackInvokedCallbacks | API reference | Android Developers api reference android developers https://developer.android.com/reference/android/window/SystemOnBackInvokedCallbacks?authuser=0 SystemOnBackInvokedCallbacks | API reference | Android Developers api reference android developers