Android IllegalThreadStateException in LunarLander

Question

Just come to polishing my application and making it resume after the user has left. When the application restores I get an IllegalThreadStateException, which is quite annoying.

Answer 1

So in the code, when surfaceDestroyed() is called, it sets mRun to false and calls thread.join(). This causes the thread to complete and die. When the app is started again and surfaceCreated() is called, it calls thread.start(). This is invalid because the thread can not be started after it dies.

Two options to fix:

a) Start a new thread in surfaceCreated() - as above.

b) Or add a check in surfaceDestroyed() against Activity.isFinishing() to only end the thread if true. To do this, I surrounded the while(mRun) in the thread with another while loop that is only set to false if isFinishing() returns true.