Android第一个Activity没有真正被破坏

When I was debugging my app with AndroidDeviceMonitor, I found that my app's heap was odd. After starting the app (SplashActivity -> MainActivity), the "1-byte array" has been allocated 42MB. I was sure the SplashActivity has been destroyed and I'm using LeakCanary to discover if there is any memory leakage. But I did not find anything.When I was debugging my app with AndroidDeviceM