/**
* This method will give JS the opportunity to consume the back button event. If JS does not
* consume the event, mDefaultBackButtonImpl will be invoked at the end of the round trip to JS.
*/
@Override
public void onBackPressed() {
UiThreadUtil.assertOnUiThread();
ReactContext reactContext = mCurrentReactContext;
if (mCurrentReactContext == null) {
// Invoke without round trip to JS.
FLog.w(ReactConstants.TAG, "Instance detached from instance manager");
invokeDefaultOnBackPressed();
} else {
DeviceEventManagerModule deviceEventManagerModule =
Assertions.assertNotNull(reactContext).getNativeModule(DeviceEventManagerModule.class);
deviceEventManagerModule.emitHardwareBackPressed();
}
}
