Application crashed after either receive a phone call or such interruptions

Answer 1

Step #1: Find line 74 of the displayActivity.java file.

Step #2: Fix whatever problem is on line 74.

Now, the stack trace suggests that line 74 is in onDestroy(). Assuming that the activity code you have listed above is from displayActivity, then line 74 must be:

listview1.setAdapter(null);

That means listview1 is null. You neither declare nor assign a value to this data member in the code you have listed above.

Answer 2

try setting a BP at the first line of onDestroy and validate vars/members to find which one is null