Wish Ability to access other activity lifecycle events (e.g. onDestroy)

[daemon]

For the Crosswalk library I'm developing, document says that it needs many activity lifecycle events and onDestroy() is MUST, since otherwise it will cause memory leak from the native side of the web engine.

Refer: https://crosswalk-project.org/apis/embeddingapidocs/reference/org/xwalk/core/XWalkView.html

The document talks about these events:
onCreate -> Activity_Create
onResume -> Activity_Resume
onPause -> Activity_Pause
onDestroy
onActivityResult
onNewIntent

I wish to have provision to hook-up code to onDestroy and other events.

Older related discussion: http://www.b4x.com/android/forum/threads/implement-ondestroy.20244/

 

[Erel]

onActivityResult and onNewIntent are both handled internally.

You can use the #Extends attribute to handle these events in your library: http://www.b4x.com/android/forum/threads/extending-activity-class.40502/#content

 

[daemon]

I'm using this code to handle onDestroy() event:

public class ActivityLifeCycleEvents extends Activity {

    @Override
    public void onDestroy() {
        super.onDestroy();
        try {
            BA ba = (BA) this.getClass().getField("processBA").get(null);
            ba.raiseEvent(null, "activity_destroy");
            return;
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }

}

In my application, I added #Extends attribute:

#Region  Activity Attributes
    #FullScreen: False
    #IncludeTitle: True
    #Extends: b4a.ActivityLifeCycleEvents
#End Region

And...

Sub Activity_Destroy
    Log("Destroy")
End Sub

Will it work?
How do I make activity go through this state?

I tried killing the app through Settings->Apps->TestApp->Force stop

 

[Erel]

Add a log message in your Java code to see that it runs.

Your code looks correct. OnDestroy is not called when the process is killed (this is why it is mostly useless).

Press on the back key to destroy the activity.

 

[daemon]

onDestroy() of my library gets called on pressing back button. I can see log in B4A.
Is there any alternative to ba.raiseEvent?

 

[Erel]

The event is not raised because the activity is paused at that point. This code will not work.

You can try to call destroy from Activity_Create to destroy the previous instance (if such exists).