Android app doesn't call "onDestroy()" when killed (ICS)

user_1083606 0
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I'm developing an android app using bluetooth communication (using a propetary protocol) and I need to catch the moment when the app is killed.

I wanted to use the "onDestroy()" method but it isn't called every time the app is killed. I noticed that it is called when I press the back button and, only sometimes, when I kill the app from the task manager.

The question is: How can I catch the moment before the app is killed?

Here is the code I tried to use:

@Override
public void onDestroy() {
    sendMessage(msg);
    Log.d("SampleApp", "destroy");
    super.onDestroy();
}

@Override
public void finish(){

    sendMessage(msg);
    Log.d("SampleApp", "finish");
    super.finish();
}

Unfortunately finish() is never called and onDestroy isn't called every time I close the app from the task manager.

How can I handle this?

ondestroy android-4.0-ice-cream-sandwich android
3 Answers

I just resolved a similar kind of issue.

Here is what you can do if its just about stopping service when application is killed by swiping from Recent app list.

Inside your Manifest file, keep flag stopWithTask as true for Service. Like:

<service
    android:name="com.myapp.MyService"
    android:stopWithTask="true" />

But as you say you want to unregister listeners and stop notification etc, I would suggest this approach:

  1. Inside your Manifest file, keep flag stopWithTask as false for Service. Like:

    <service
    android:name="com.myapp.MyService"
    android:stopWithTask="false" />

  2. Now in your MyService service, override method onTaskRemoved. (This will be fired only if stopWithTask is set to false).

    public void onTaskRemoved(Intent rootIntent) {

    //unregister listeners
    //do any other cleanup if required

    //stop service
    stopSelf();  
}

Refer this question for more details, which contains other part of code, too.

  1. Start service like below

startService(new Intent(this, MyService.class));

Hope this helps.

user_25995960
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