Your application logic should be coded in such a way that the process can be killed at any time (usually once it's in the background), or not be killed, and still work correctly. There is no callback when the process is killed.
Pressing the back key always finishes the current activity - the back key tells Android that the user is done with whatever he was doing in that activity, and will not come back. But this does not kill the process, because activity != process. Try pressing the home key instead - the activity will be paused / stopped, but not terminated, then come back by long-pressing the home key - you should see onStart / onResume, but not onCreate. All of this is explained very well here: http://developer.android.com/guide/topics/fundamentals/activities.html#Lifecycle http://developer.android.com/guide/topics/fundamentals/processes-and-threads.html For debugging purposes, use "adb shell ps" (the usual Unix "ps" - process state), look for your application within the process list, and note its process ID. Or use the DDMS perspective in Eclipse - the second column in the Devices panel, under Online, is also the process ID. -- Kostya 2011/5/29 Anirvan <[email protected]> > thanks for the response Kostya. but i does one truly determine that > the application 'process' has terminated? > > for testing, i've created a single Activity which serves as the Main. > when i press the back button after launching this activity, the app > ends. i've also verified that the app is no longer running by checking > the Task Manager. > > is there some other check that i can make from my program to make sure > that the app process has terminated? > > On May 29, 12:33 am, Kostya Vasilyev <[email protected]> wrote: > > Statics do live as long as the process. > > > > onDestroy is not an indication that the process is exiting - your > activity > > is getting destroyed, but the process may (and in your case, does) live > on. > > When you come back to the application, Android uses the same process to > > create another instance of your activity and call onCreate (and other > > callbacks). > > > > Try stopping your application in the Settings application. > > > > Making a small code change and relaunching the debug session is another > way > > to make sure you get a brand new process. > > > > -- Kostya > > > > 2011/5/28 Anirvan <[email protected]> > > > > > > > > > > > > > > > > > hello, > > > > > for quite some time i was blissfully of the opinion that static > > > [instance] variables exist as long as the app runs. however, to my > > > dismay, and much alarm, i feel that it's not true. > > > > > for mere testing, i created a static list of strings, and in my main > > > activity class overrode the onDestroy method to print a message to > > > verify that the app exited. in the onCreate method i simply added a > > > new string, and printed the contents of the list. what i've found is > > > that the size of the list keeps on increasing, and all the string > > > values added previously are still present. > > > > > is there some cardinal mistake in what i assumed should be the > > > behaviour of instance variables, or is there something that i should > > > keep in mind when dealing with instance variables? > > > > > what gives? > > > > > thanks for your time and help. > > > > > -- > > > You received this message because you are subscribed to the Google > > > Groups "Android Developers" group. > > > To post to this group, send email to > [email protected] > > > To unsubscribe from this group, send email to > > > [email protected] > > > For more options, visit this group at > > >http://groups.google.com/group/android-developers?hl=en > > -- > You received this message because you are subscribed to the Google > Groups "Android Developers" group. > To post to this group, send email to [email protected] > To unsubscribe from this group, send email to > [email protected] > For more options, visit this group at > http://groups.google.com/group/android-developers?hl=en > -- You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
