[android-developers] Re: Changing a Back button press to Home button press
Dianne, If there is a more appropriate way of doing this please advise. My activity, starts, stops and binds to a service. When the activity is focused, it receives text from the service it is bound to. When ever the user navigates away from the activity all the currently received text is saved in onSaveInstanceState() so it can be displayed once again when focus returns. Though if the back button is used, it does not get called ( is this correct? ). The user must never be able to stop activity running without selecting stop from the activity menu, which in turn stops the service and calls finish(). Liam On Sep 2, 5:53 pm, Dianne Hackborn hack...@android.com wrote: On Wed, Sep 2, 2009 at 2:19 AM, Ne0 liamjamesalf...@googlemail.com wrote: Yes that is what i want to achieve and i know it is acting in a non- standard way. Please correct me if you think i am going about this in the wrong way, but my understanding is that using the back button destroys the focused activity and hence does not hit onSaveInstanceState(...). The users of this application will be expecting it to return to its saved instance state the next time they start the activity, unless they use the apps menu to stop the app running. No they won't expect this, because that is not how android works. And there is certainly not an apps menu menu for them to stop apps. Please don't try to make your application behave in a way you think it should from some other environment. It should behave consistently with the android UI model, wherever appropriate. -- Dianne Hackborn Android framework engineer hack...@android.com Note: please don't send private questions to me, as I don't have time to provide private support, and so won't reply to such e-mails. All such questions should be posted on public forums, where I and others can see and answer them. --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups Android Developers group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en -~--~~~~--~~--~--~---
[android-developers] Re: Changing a Back button press to Home button press
We've already been having this discussion in another thread. If you want to retain some state in your activity -- even across the user pressing back to finish your activity and then later launching it again -- then just save that state, in whatever way you want, in onPause(). If you want to let the user have some background thing of your app going on while the user is not in its UI, you can have in your UI a facility for them to explicitly start and stop the background work. That is not the same as them quitting your app. On Thu, Sep 3, 2009 at 1:09 AM, Ne0 liamjamesalf...@googlemail.com wrote: Dianne, If there is a more appropriate way of doing this please advise. My activity, starts, stops and binds to a service. When the activity is focused, it receives text from the service it is bound to. When ever the user navigates away from the activity all the currently received text is saved in onSaveInstanceState() so it can be displayed once again when focus returns. Though if the back button is used, it does not get called ( is this correct? ). The user must never be able to stop activity running without selecting stop from the activity menu, which in turn stops the service and calls finish(). Liam On Sep 2, 5:53 pm, Dianne Hackborn hack...@android.com wrote: On Wed, Sep 2, 2009 at 2:19 AM, Ne0 liamjamesalf...@googlemail.com wrote: Yes that is what i want to achieve and i know it is acting in a non- standard way. Please correct me if you think i am going about this in the wrong way, but my understanding is that using the back button destroys the focused activity and hence does not hit onSaveInstanceState(...). The users of this application will be expecting it to return to its saved instance state the next time they start the activity, unless they use the apps menu to stop the app running. No they won't expect this, because that is not how android works. And there is certainly not an apps menu menu for them to stop apps. Please don't try to make your application behave in a way you think it should from some other environment. It should behave consistently with the android UI model, wherever appropriate. -- Dianne Hackborn Android framework engineer hack...@android.com Note: please don't send private questions to me, as I don't have time to provide private support, and so won't reply to such e-mails. All such questions should be posted on public forums, where I and others can see and answer them. -- Dianne Hackborn Android framework engineer hack...@android.com Note: please don't send private questions to me, as I don't have time to provide private support, and so won't reply to such e-mails. All such questions should be posted on public forums, where I and others can see and answer them. --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups Android Developers group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en -~--~~~~--~~--~--~---
[android-developers] Re: Changing a Back button press to Home button press
See http://developer.android.com/reference/android/app/Activity.html#onSaveInstanceState(android.os.Bundle) for an explanation of why onSaveInstanceState is not called in your use case. You should save your state somewhere else, like in onPause() On Thu, Sep 3, 2009 at 1:09 AM, Ne0liamjamesalf...@googlemail.com wrote: Dianne, If there is a more appropriate way of doing this please advise. My activity, starts, stops and binds to a service. When the activity is focused, it receives text from the service it is bound to. When ever the user navigates away from the activity all the currently received text is saved in onSaveInstanceState() so it can be displayed once again when focus returns. Though if the back button is used, it does not get called ( is this correct? ). The user must never be able to stop activity running without selecting stop from the activity menu, which in turn stops the service and calls finish(). Liam On Sep 2, 5:53 pm, Dianne Hackborn hack...@android.com wrote: On Wed, Sep 2, 2009 at 2:19 AM, Ne0 liamjamesalf...@googlemail.com wrote: Yes that is what i want to achieve and i know it is acting in a non- standard way. Please correct me if you think i am going about this in the wrong way, but my understanding is that using the back button destroys the focused activity and hence does not hit onSaveInstanceState(...). The users of this application will be expecting it to return to its saved instance state the next time they start the activity, unless they use the apps menu to stop the app running. No they won't expect this, because that is not how android works. And there is certainly not an apps menu menu for them to stop apps. Please don't try to make your application behave in a way you think it should from some other environment. It should behave consistently with the android UI model, wherever appropriate. -- Dianne Hackborn Android framework engineer hack...@android.com Note: please don't send private questions to me, as I don't have time to provide private support, and so won't reply to such e-mails. All such questions should be posted on public forums, where I and others can see and answer them. --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups Android Developers group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en -~--~~~~--~~--~--~---
[android-developers] Re: Changing a Back button press to Home button press
Yes that is what i want to achieve and i know it is acting in a non-
standard way. Please correct me if you think i am going about this in
the wrong way, but my understanding is that using the back button
destroys the focused activity and hence does not hit
onSaveInstanceState(...). The users of this application will be
expecting it to return to its saved instance state the next time they
start the activity, unless they use the apps menu to stop the app
running.
Does this mean there is a Home activity then? Do you have any info
about obtaining the Context for this activity so i can launch it?
Liam
On Sep 1, 5:39 pm, Marco Nelissen marc...@android.com wrote:
Couldn't you just 'eat' the back key, and use startActivity() to
launch home when you receive it? That should pretty much give you the
effect the effect you're looking for.
Of course, then your app is behaving in a nonstandard way, which might
confuse users, so you should ask yourself whether this is really what
you want to do.
On Tue, Sep 1, 2009 at 8:21 AM, Ne0liamjamesalf...@googlemail.com wrote:
Trying to the do as the title describes with the following code, but
it doesn't seem to work. It just does nothing once i have altered the
keyCode. Do i have to do something to the event?
public boolean onKeyDown(int keyCode, KeyEvent event) {
/*
* The back key usually destroys the activity
* without saving the instance. We want the
* instance saved if the activity gets destroyed
* so we are pretending its a home key press.
*/
if(gLOG){Log.d(TAG,onKeyDown);}
if(keyCode == KeyEvent.KEYCODE_BACK){
if(gLOG){Log.d(TAG,KEYCODE_BACK + keyCode);}
keyCode = KeyEvent.KEYCODE_HOME;
}
return super.onKeyDown(keyCode, event);
}
Thanks for any help.
Liam
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[android-developers] Re: Changing a Back button press to Home button press
On Wed, Sep 2, 2009 at 2:19 AM, Ne0 liamjamesalf...@googlemail.com wrote: Yes that is what i want to achieve and i know it is acting in a non- standard way. Please correct me if you think i am going about this in the wrong way, but my understanding is that using the back button destroys the focused activity and hence does not hit onSaveInstanceState(...). The users of this application will be expecting it to return to its saved instance state the next time they start the activity, unless they use the apps menu to stop the app running. No they won't expect this, because that is not how android works. And there is certainly not an apps menu menu for them to stop apps. Please don't try to make your application behave in a way you think it should from some other environment. It should behave consistently with the android UI model, wherever appropriate. -- Dianne Hackborn Android framework engineer hack...@android.com Note: please don't send private questions to me, as I don't have time to provide private support, and so won't reply to such e-mails. All such questions should be posted on public forums, where I and others can see and answer them. --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups Android Developers group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en -~--~~~~--~~--~--~---
[android-developers] Re: Changing a Back button press to Home button press
This won't work. You just cannot do this.
On Tue, Sep 1, 2009 at 8:21 AM, Ne0liamjamesalf...@googlemail.com wrote:
Trying to the do as the title describes with the following code, but
it doesn't seem to work. It just does nothing once i have altered the
keyCode. Do i have to do something to the event?
public boolean onKeyDown(int keyCode, KeyEvent event) {
/*
* The back key usually destroys the activity
* without saving the instance. We want the
* instance saved if the activity gets destroyed
* so we are pretending its a home key press.
*/
if(gLOG){Log.d(TAG,onKeyDown);}
if(keyCode == KeyEvent.KEYCODE_BACK){
if(gLOG){Log.d(TAG,KEYCODE_BACK + keyCode);}
keyCode = KeyEvent.KEYCODE_HOME;
}
return super.onKeyDown(keyCode, event);
}
Thanks for any help.
Liam
--
Romain Guy
Android framework engineer
romain...@android.com
Note: please don't send private questions to me, as I don't have time
to provide private support. All such questions should be posted on
public forums, where I and others can see and answer them
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[android-developers] Re: Changing a Back button press to Home button press
Couldn't you just 'eat' the back key, and use startActivity() to
launch home when you receive it? That should pretty much give you the
effect the effect you're looking for.
Of course, then your app is behaving in a nonstandard way, which might
confuse users, so you should ask yourself whether this is really what
you want to do.
On Tue, Sep 1, 2009 at 8:21 AM, Ne0liamjamesalf...@googlemail.com wrote:
Trying to the do as the title describes with the following code, but
it doesn't seem to work. It just does nothing once i have altered the
keyCode. Do i have to do something to the event?
public boolean onKeyDown(int keyCode, KeyEvent event) {
/*
* The back key usually destroys the activity
* without saving the instance. We want the
* instance saved if the activity gets destroyed
* so we are pretending its a home key press.
*/
if(gLOG){Log.d(TAG,onKeyDown);}
if(keyCode == KeyEvent.KEYCODE_BACK){
if(gLOG){Log.d(TAG,KEYCODE_BACK + keyCode);}
keyCode = KeyEvent.KEYCODE_HOME;
}
return super.onKeyDown(keyCode, event);
}
Thanks for any help.
Liam
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