An issue with Android apps pressing the return key to exit abnormally

In the development process encountered by the return key exception exit problem, log display as a null pointer exception, further production is because the Onactivityresult intent is empty.

Press the back key to duplicate the code as follows:

        @Overridepublic void onbackpressed () {super.onbackpressed () Intent Intent = new Intent (); Intent.putextra ("id", id); Intent.putextra ("path", path); Setresult (result_canceled, intent); Finish ();}

View activity source Discovery onbackpressed The default implementation is as follows:

    /** * Called when the activity had detected the user's press of the back      * key.  The default implementation simply finishes the current activity, * and you can override this to do      whatever you want.< c6/>*/public      void onbackpressed () {          finish ();      }  

So if super.onbackpressed () is called, the finish () function is called, so the subsequent Setresult function does not work at all. After removing the super.onbackpressed (), the exception disappears.

An issue with Android apps pressing the return key to exit abnormally