[android-beginners] Re: How to make a child activity?

[niko20]

I dont understand why everyone makes this so complicated.

First of all, this is a phone, you don't want to be using tons of data
structures. There is nothing wrong with some global variables/
functions.

If you want to store data that will be shared between activities, just
simply use a static class with all static methods. Then you don't need
a singleton or anything else fancy. It will act as a global reference,
with the benefit of having its own namespace too.

There is no need to do all this fancy programming stuff when you are
writing for an embedded device! Master View Controller is way
overboard! Just do code to get the job done (but still clean code of
course). Just because you CAN do something doesn't mean you should. Or
even if it's "recommended" that it's the best way to do it, especially
on a mobile platform. Windows C++ programming techniques are not
really portable to this platform.

-niko

On Oct 16, 7:00 pm, Paul Turchenko  wrote:
> Another way you can use to share common data between activities is
> having it in the Application's instance. Just create your own
> Application - derived class, tell Android via manifest to use it and
> you can easily access it from any context. Say you have MyApplication
> extending Application, then (after specifying that in manifest) you
> can access your MyApplication's instance via (MyApplication)
> getApplication() call from any of your activities. Perhaps the
> singleton pattern is more handy in your design, but just consider this
> approach FYI.
>
> On Oct 16, 11:22 am, vchris80  wrote:
>
> > thanks, I feel a bit over complicate and bug-prone to manage views
> > manually via setContentView, so I simply changed the architecture,
> > putting the common classes of interest in a singleton (luckily this
> > solution fits with my app design). This way I can decouple the
> > activities and keep a common business class, leaving Android manage
> > the views.
>
> > On 15 Ott, 20:45, "Yusuf Saib (T-Mobile USA)" 
> > Mobile.com> wrote:
> > > If you are more specific about what the 3+ buttons are supposed to do,
> > > we may be able to suggest alternatives.
>
> > > To answer your question, setContentView is needed with ActivityGroup.
>
> > > Yusuf Saib
> > > Android
> > > ·T· · ·Mobile· stick together
> > > The views, opinions and statements in this email are those of the
> > > author solely in their individual capacity, and do not necessarily
> > > represent those of T-Mobile USA, Inc.
>
> > > P.S. You can only make a child activity when a mommy activity and a
> > > daddy activity love each other very much enough to get married first.
>
> > > On Oct 15, 12:50 am, vchris80  wrote:
>
> > > > hi james, thanx for reply. I try to explain what I want to achieve.
>
> > > > It is actually very simple, but maybe I am walking on the wrong path
> > > > since I "think in the Windows way" other than in the "Android way" :)
>
> > > > My app is a window with 3 buttons (can't use tab since the buttons
> > > > will increase in the future and since this is a porting from other
> > > > platform and I have to follow the same UI guidelines as far as
> > > > possible). Each button launch an activity and needs a reference to the
> > > > main activity (parent) in order to use some common utility classes.
>
> > > > I thought to do so by implementing the main activity as an
> > > > ActivityGroup (thank to you first suggestion) and launch each child
> > > > activity by getLocalActivityManager().startActivity() as I said in the
> > > > previous post. But, as said, this doesn't update the screen with the
> > > > new activity view. I have to explicitly call setContentView and put
> > > > the child activity view (obtained by getDecorView()). Is this the
> > > > right way or am I doing a mess? Then, when I finish() the child I
> > > > restore the old view.
>
> > > > On 14 Ott, 20:50, James Yum  wrote:
>
> > > > > Hi,
> > > > > I'm still not sure what you're trying to achieve. Are you really 
> > > > > trying to
> > > > > embed an activity within another? You can look at the TabActivity 
> > > > > source for
> > > > > a pretty clean example:
>
> > > > >http://android.git.kernel.org/?p=platform/frameworks/base.git;a=blob;...
>
> > > > > 
> > > > > Cheers,
> > > > > James
>
> > > > > On Wed, Oct 14, 2009 at 1:31 AM, vchris80  wrote:
>
> > > > > > thank for your reply, but I still have some troubles:
>
> > > > > > now I have my main activiy been a ActivityGroup and the child 
> > > > > > activity
> > > > > > been a simple Activity.
>
> > > > > > I start the child with this code:
>
> > > > > > Intent startIntent = new Intent(MyMainActivity.this,
> > > > > > ChildActivity.class);
> > > > > > getLocalActivityManager().startActivity("and.mypackage.ChildActivity",
> > > > > > startIntent);
>
> > > > > > this way, in the onCreate of the child activity, I can get the 
> > > > > > parent
> > > > > > and the activity results child of s

[android-beginners] Re: How to make a child activity?

[Paul Turchenko]

Another way you can use to share common data between activities is
having it in the Application's instance. Just create your own
Application - derived class, tell Android via manifest to use it and
you can easily access it from any context. Say you have MyApplication
extending Application, then (after specifying that in manifest) you
can access your MyApplication's instance via (MyApplication)
getApplication() call from any of your activities. Perhaps the
singleton pattern is more handy in your design, but just consider this
approach FYI.

On Oct 16, 11:22 am, vchris80  wrote:
> thanks, I feel a bit over complicate and bug-prone to manage views
> manually via setContentView, so I simply changed the architecture,
> putting the common classes of interest in a singleton (luckily this
> solution fits with my app design). This way I can decouple the
> activities and keep a common business class, leaving Android manage
> the views.
>
> On 15 Ott, 20:45, "Yusuf Saib (T-Mobile USA)" 
> Mobile.com> wrote:
> > If you are more specific about what the 3+ buttons are supposed to do,
> > we may be able to suggest alternatives.
>
> > To answer your question, setContentView is needed with ActivityGroup.
>
> > Yusuf Saib
> > Android
> > ·T· · ·Mobile· stick together
> > The views, opinions and statements in this email are those of the
> > author solely in their individual capacity, and do not necessarily
> > represent those of T-Mobile USA, Inc.
>
> > P.S. You can only make a child activity when a mommy activity and a
> > daddy activity love each other very much enough to get married first.
>
> > On Oct 15, 12:50 am, vchris80  wrote:
>
> > > hi james, thanx for reply. I try to explain what I want to achieve.
>
> > > It is actually very simple, but maybe I am walking on the wrong path
> > > since I "think in the Windows way" other than in the "Android way" :)
>
> > > My app is a window with 3 buttons (can't use tab since the buttons
> > > will increase in the future and since this is a porting from other
> > > platform and I have to follow the same UI guidelines as far as
> > > possible). Each button launch an activity and needs a reference to the
> > > main activity (parent) in order to use some common utility classes.
>
> > > I thought to do so by implementing the main activity as an
> > > ActivityGroup (thank to you first suggestion) and launch each child
> > > activity by getLocalActivityManager().startActivity() as I said in the
> > > previous post. But, as said, this doesn't update the screen with the
> > > new activity view. I have to explicitly call setContentView and put
> > > the child activity view (obtained by getDecorView()). Is this the
> > > right way or am I doing a mess? Then, when I finish() the child I
> > > restore the old view.
>
> > > On 14 Ott, 20:50, James Yum  wrote:
>
> > > > Hi,
> > > > I'm still not sure what you're trying to achieve. Are you really trying 
> > > > to
> > > > embed an activity within another? You can look at the TabActivity 
> > > > source for
> > > > a pretty clean example:
>
> > > >http://android.git.kernel.org/?p=platform/frameworks/base.git;a=blob;...
>
> > > > 
> > > > Cheers,
> > > > James
>
> > > > On Wed, Oct 14, 2009 at 1:31 AM, vchris80  wrote:
>
> > > > > thank for your reply, but I still have some troubles:
>
> > > > > now I have my main activiy been a ActivityGroup and the child activity
> > > > > been a simple Activity.
>
> > > > > I start the child with this code:
>
> > > > > Intent startIntent = new Intent(MyMainActivity.this,
> > > > > ChildActivity.class);
> > > > > getLocalActivityManager().startActivity("and.mypackage.ChildActivity",
> > > > > startIntent);
>
> > > > > this way, in the onCreate of the child activity, I can get the parent
> > > > > and the activity results child of something by calling isChild()
> > > > > method. Fine. But the screen actually doesn't appear. The
> > > > > documentation of startActivity of LocalActivityManager says that "The
> > > > > caller needs to take care of adding this window to a view hierarchy",
> > > > > but I can't figure out how to do that. I watched the WindowManager for
> > > > > a suitable method but with no luck.
>
> > > > > On 13 Ott, 19:09, James Yum  wrote:
> > > > > > Hi,
> > > > > > Those are meant for an ActivityGroup and its embedded activities, 
> > > > > > for
> > > > > > example a TabActivity.
>
> > > > > > What you might want to look into, is this introduction on opening 
> > > > > > screens
> > > > > > (activities):
>
> > > > > >http://developer.android.com/guide/appendix/faq/commontasks.html#open...
>
> > > > > > Cheers,
> > > > > > James
>
> > > > > > On Tue, Oct 13, 2009 at 7:25 AM, vchris80  wrote:
>
> > > > > > > Hi all, I have a simple question: how I make an activity that is 
> > > > > > > child
> > > > > > > of another?
>
> > > > > > > I use this code to start an activity from another:
>
> > > > > > > Intent startIntent 

[android-beginners] Re: How to make a child activity?

[vchris80]

thanks, I feel a bit over complicate and bug-prone to manage views
manually via setContentView, so I simply changed the architecture,
putting the common classes of interest in a singleton (luckily this
solution fits with my app design). This way I can decouple the
activities and keep a common business class, leaving Android manage
the views.

On 15 Ott, 20:45, "Yusuf Saib (T-Mobile USA)"  wrote:
> If you are more specific about what the 3+ buttons are supposed to do,
> we may be able to suggest alternatives.
>
> To answer your question, setContentView is needed with ActivityGroup.
>
> Yusuf Saib
> Android
> ·T· · ·Mobile· stick together
> The views, opinions and statements in this email are those of the
> author solely in their individual capacity, and do not necessarily
> represent those of T-Mobile USA, Inc.
>
> P.S. You can only make a child activity when a mommy activity and a
> daddy activity love each other very much enough to get married first.
>
> On Oct 15, 12:50 am, vchris80  wrote:
>
> > hi james, thanx for reply. I try to explain what I want to achieve.
>
> > It is actually very simple, but maybe I am walking on the wrong path
> > since I "think in the Windows way" other than in the "Android way" :)
>
> > My app is a window with 3 buttons (can't use tab since the buttons
> > will increase in the future and since this is a porting from other
> > platform and I have to follow the same UI guidelines as far as
> > possible). Each button launch an activity and needs a reference to the
> > main activity (parent) in order to use some common utility classes.
>
> > I thought to do so by implementing the main activity as an
> > ActivityGroup (thank to you first suggestion) and launch each child
> > activity by getLocalActivityManager().startActivity() as I said in the
> > previous post. But, as said, this doesn't update the screen with the
> > new activity view. I have to explicitly call setContentView and put
> > the child activity view (obtained by getDecorView()). Is this the
> > right way or am I doing a mess? Then, when I finish() the child I
> > restore the old view.
>
> > On 14 Ott, 20:50, James Yum  wrote:
>
> > > Hi,
> > > I'm still not sure what you're trying to achieve. Are you really trying to
> > > embed an activity within another? You can look at the TabActivity source 
> > > for
> > > a pretty clean example:
>
> > >http://android.git.kernel.org/?p=platform/frameworks/base.git;a=blob;...
>
> > > 
> > > Cheers,
> > > James
>
> > > On Wed, Oct 14, 2009 at 1:31 AM, vchris80  wrote:
>
> > > > thank for your reply, but I still have some troubles:
>
> > > > now I have my main activiy been a ActivityGroup and the child activity
> > > > been a simple Activity.
>
> > > > I start the child with this code:
>
> > > > Intent startIntent = new Intent(MyMainActivity.this,
> > > > ChildActivity.class);
> > > > getLocalActivityManager().startActivity("and.mypackage.ChildActivity",
> > > > startIntent);
>
> > > > this way, in the onCreate of the child activity, I can get the parent
> > > > and the activity results child of something by calling isChild()
> > > > method. Fine. But the screen actually doesn't appear. The
> > > > documentation of startActivity of LocalActivityManager says that "The
> > > > caller needs to take care of adding this window to a view hierarchy",
> > > > but I can't figure out how to do that. I watched the WindowManager for
> > > > a suitable method but with no luck.
>
> > > > On 13 Ott, 19:09, James Yum  wrote:
> > > > > Hi,
> > > > > Those are meant for an ActivityGroup and its embedded activities, for
> > > > > example a TabActivity.
>
> > > > > What you might want to look into, is this introduction on opening 
> > > > > screens
> > > > > (activities):
>
> > > > >http://developer.android.com/guide/appendix/faq/commontasks.html#open...
>
> > > > > Cheers,
> > > > > James
>
> > > > > On Tue, Oct 13, 2009 at 7:25 AM, vchris80  wrote:
>
> > > > > > Hi all, I have a simple question: how I make an activity that is 
> > > > > > child
> > > > > > of another?
>
> > > > > > I use this code to start an activity from another:
>
> > > > > > Intent startIntent = new Intent(MyMainActivity.this,
> > > > > > ChildActivity.class);
> > > > > > startActivity(startIntent);
>
> > > > > > but on the onCreate method of ChildActivity, if I watch for 
> > > > > > getParent
> > > > > > () I get null, and if I ask for isChild() I get false,... so what I
> > > > > > miss?
>
> > > > > > thank you
>
>
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[android-beginners] Re: How to make a child activity?

[Yusuf Saib (T-Mobile USA)]

If you are more specific about what the 3+ buttons are supposed to do,
we may be able to suggest alternatives.

To answer your question, setContentView is needed with ActivityGroup.



Yusuf Saib
Android
·T· · ·Mobile· stick together
The views, opinions and statements in this email are those of the
author solely in their individual capacity, and do not necessarily
represent those of T-Mobile USA, Inc.


P.S. You can only make a child activity when a mommy activity and a
daddy activity love each other very much enough to get married first.



On Oct 15, 12:50 am, vchris80  wrote:
> hi james, thanx for reply. I try to explain what I want to achieve.
>
> It is actually very simple, but maybe I am walking on the wrong path
> since I "think in the Windows way" other than in the "Android way" :)
>
> My app is a window with 3 buttons (can't use tab since the buttons
> will increase in the future and since this is a porting from other
> platform and I have to follow the same UI guidelines as far as
> possible). Each button launch an activity and needs a reference to the
> main activity (parent) in order to use some common utility classes.
>
> I thought to do so by implementing the main activity as an
> ActivityGroup (thank to you first suggestion) and launch each child
> activity by getLocalActivityManager().startActivity() as I said in the
> previous post. But, as said, this doesn't update the screen with the
> new activity view. I have to explicitly call setContentView and put
> the child activity view (obtained by getDecorView()). Is this the
> right way or am I doing a mess? Then, when I finish() the child I
> restore the old view.
>
> On 14 Ott, 20:50, James Yum  wrote:
>
>
>
> > Hi,
> > I'm still not sure what you're trying to achieve. Are you really trying to
> > embed an activity within another? You can look at the TabActivity source for
> > a pretty clean example:
>
> >http://android.git.kernel.org/?p=platform/frameworks/base.git;a=blob;...
>
> > 
> > Cheers,
> > James
>
> > On Wed, Oct 14, 2009 at 1:31 AM, vchris80  wrote:
>
> > > thank for your reply, but I still have some troubles:
>
> > > now I have my main activiy been a ActivityGroup and the child activity
> > > been a simple Activity.
>
> > > I start the child with this code:
>
> > > Intent startIntent = new Intent(MyMainActivity.this,
> > > ChildActivity.class);
> > > getLocalActivityManager().startActivity("and.mypackage.ChildActivity",
> > > startIntent);
>
> > > this way, in the onCreate of the child activity, I can get the parent
> > > and the activity results child of something by calling isChild()
> > > method. Fine. But the screen actually doesn't appear. The
> > > documentation of startActivity of LocalActivityManager says that "The
> > > caller needs to take care of adding this window to a view hierarchy",
> > > but I can't figure out how to do that. I watched the WindowManager for
> > > a suitable method but with no luck.
>
> > > On 13 Ott, 19:09, James Yum  wrote:
> > > > Hi,
> > > > Those are meant for an ActivityGroup and its embedded activities, for
> > > > example a TabActivity.
>
> > > > What you might want to look into, is this introduction on opening 
> > > > screens
> > > > (activities):
>
> > > >http://developer.android.com/guide/appendix/faq/commontasks.html#open...
>
> > > > Cheers,
> > > > James
>
> > > > On Tue, Oct 13, 2009 at 7:25 AM, vchris80  wrote:
>
> > > > > Hi all, I have a simple question: how I make an activity that is child
> > > > > of another?
>
> > > > > I use this code to start an activity from another:
>
> > > > > Intent startIntent = new Intent(MyMainActivity.this,
> > > > > ChildActivity.class);
> > > > > startActivity(startIntent);
>
> > > > > but on the onCreate method of ChildActivity, if I watch for getParent
> > > > > () I get null, and if I ask for isChild() I get false,... so what I
> > > > > miss?
>
> > > > > thank you
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[android-beginners] Re: How to make a child activity?

[vchris80]

hi james, thanx for reply. I try to explain what I want to achieve.

It is actually very simple, but maybe I am walking on the wrong path
since I "think in the Windows way" other than in the "Android way" :)

My app is a window with 3 buttons (can't use tab since the buttons
will increase in the future and since this is a porting from other
platform and I have to follow the same UI guidelines as far as
possible). Each button launch an activity and needs a reference to the
main activity (parent) in order to use some common utility classes.

I thought to do so by implementing the main activity as an
ActivityGroup (thank to you first suggestion) and launch each child
activity by getLocalActivityManager().startActivity() as I said in the
previous post. But, as said, this doesn't update the screen with the
new activity view. I have to explicitly call setContentView and put
the child activity view (obtained by getDecorView()). Is this the
right way or am I doing a mess? Then, when I finish() the child I
restore the old view.





On 14 Ott, 20:50, James Yum  wrote:
> Hi,
> I'm still not sure what you're trying to achieve. Are you really trying to
> embed an activity within another? You can look at the TabActivity source for
> a pretty clean example:
>
> http://android.git.kernel.org/?p=platform/frameworks/base.git;a=blob;...
>
> 
> Cheers,
> James
>
> On Wed, Oct 14, 2009 at 1:31 AM, vchris80  wrote:
>
> > thank for your reply, but I still have some troubles:
>
> > now I have my main activiy been a ActivityGroup and the child activity
> > been a simple Activity.
>
> > I start the child with this code:
>
> > Intent startIntent = new Intent(MyMainActivity.this,
> > ChildActivity.class);
> > getLocalActivityManager().startActivity("and.mypackage.ChildActivity",
> > startIntent);
>
> > this way, in the onCreate of the child activity, I can get the parent
> > and the activity results child of something by calling isChild()
> > method. Fine. But the screen actually doesn't appear. The
> > documentation of startActivity of LocalActivityManager says that "The
> > caller needs to take care of adding this window to a view hierarchy",
> > but I can't figure out how to do that. I watched the WindowManager for
> > a suitable method but with no luck.
>
> > On 13 Ott, 19:09, James Yum  wrote:
> > > Hi,
> > > Those are meant for an ActivityGroup and its embedded activities, for
> > > example a TabActivity.
>
> > > What you might want to look into, is this introduction on opening screens
> > > (activities):
>
> > >http://developer.android.com/guide/appendix/faq/commontasks.html#open...
>
> > > Cheers,
> > > James
>
> > > On Tue, Oct 13, 2009 at 7:25 AM, vchris80  wrote:
>
> > > > Hi all, I have a simple question: how I make an activity that is child
> > > > of another?
>
> > > > I use this code to start an activity from another:
>
> > > > Intent startIntent = new Intent(MyMainActivity.this,
> > > > ChildActivity.class);
> > > > startActivity(startIntent);
>
> > > > but on the onCreate method of ChildActivity, if I watch for getParent
> > > > () I get null, and if I ask for isChild() I get false,... so what I
> > > > miss?
>
> > > > thank you
>
>
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[android-beginners] Re: How to make a child activity?

[James Yum]

Hi,
I'm still not sure what you're trying to achieve. Are you really trying to
embed an activity within another? You can look at the TabActivity source for
a pretty clean example:

http://android.git.kernel.org/?p=platform/frameworks/base.git;a=blob;f=core/java/android/app/TabActivity.java;h=033fa0c8bf87b50f9400e457f64141d7ebad221a;hb=HEAD


Cheers,
James

On Wed, Oct 14, 2009 at 1:31 AM, vchris80  wrote:

>
> thank for your reply, but I still have some troubles:
>
> now I have my main activiy been a ActivityGroup and the child activity
> been a simple Activity.
>
> I start the child with this code:
>
> Intent startIntent = new Intent(MyMainActivity.this,
> ChildActivity.class);
> getLocalActivityManager().startActivity("and.mypackage.ChildActivity",
> startIntent);
>
> this way, in the onCreate of the child activity, I can get the parent
> and the activity results child of something by calling isChild()
> method. Fine. But the screen actually doesn't appear. The
> documentation of startActivity of LocalActivityManager says that "The
> caller needs to take care of adding this window to a view hierarchy",
> but I can't figure out how to do that. I watched the WindowManager for
> a suitable method but with no luck.
>
> On 13 Ott, 19:09, James Yum  wrote:
> > Hi,
> > Those are meant for an ActivityGroup and its embedded activities, for
> > example a TabActivity.
> >
> > What you might want to look into, is this introduction on opening screens
> > (activities):
> >
> > http://developer.android.com/guide/appendix/faq/commontasks.html#open...
> >
> > Cheers,
> > James
> >
> > On Tue, Oct 13, 2009 at 7:25 AM, vchris80  wrote:
> >
> > > Hi all, I have a simple question: how I make an activity that is child
> > > of another?
> >
> > > I use this code to start an activity from another:
> >
> > > Intent startIntent = new Intent(MyMainActivity.this,
> > > ChildActivity.class);
> > > startActivity(startIntent);
> >
> > > but on the onCreate method of ChildActivity, if I watch for getParent
> > > () I get null, and if I ask for isChild() I get false,... so what I
> > > miss?
> >
> > > thank you
> >
>

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[android-beginners] Re: How to make a child activity?

[vchris80]

thank for your reply, but I still have some troubles:

now I have my main activiy been a ActivityGroup and the child activity
been a simple Activity.

I start the child with this code:

Intent startIntent = new Intent(MyMainActivity.this,
ChildActivity.class);
getLocalActivityManager().startActivity("and.mypackage.ChildActivity",
startIntent);

this way, in the onCreate of the child activity, I can get the parent
and the activity results child of something by calling isChild()
method. Fine. But the screen actually doesn't appear. The
documentation of startActivity of LocalActivityManager says that "The
caller needs to take care of adding this window to a view hierarchy",
but I can't figure out how to do that. I watched the WindowManager for
a suitable method but with no luck.

On 13 Ott, 19:09, James Yum  wrote:
> Hi,
> Those are meant for an ActivityGroup and its embedded activities, for
> example a TabActivity.
>
> What you might want to look into, is this introduction on opening screens
> (activities):
>
> http://developer.android.com/guide/appendix/faq/commontasks.html#open...
>
> Cheers,
> James
>
> On Tue, Oct 13, 2009 at 7:25 AM, vchris80  wrote:
>
> > Hi all, I have a simple question: how I make an activity that is child
> > of another?
>
> > I use this code to start an activity from another:
>
> > Intent startIntent = new Intent(MyMainActivity.this,
> > ChildActivity.class);
> > startActivity(startIntent);
>
> > but on the onCreate method of ChildActivity, if I watch for getParent
> > () I get null, and if I ask for isChild() I get false,... so what I
> > miss?
>
> > thank you
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[android-beginners] Re: How to make a child activity?

[James Yum]

Hi,
Those are meant for an ActivityGroup and its embedded activities, for
example a TabActivity.

What you might want to look into, is this introduction on opening screens
(activities):

http://developer.android.com/guide/appendix/faq/commontasks.html#opennewscreen

Cheers,
James

On Tue, Oct 13, 2009 at 7:25 AM, vchris80  wrote:

>
> Hi all, I have a simple question: how I make an activity that is child
> of another?
>
> I use this code to start an activity from another:
>
> Intent startIntent = new Intent(MyMainActivity.this,
> ChildActivity.class);
> startActivity(startIntent);
>
> but on the onCreate method of ChildActivity, if I watch for getParent
> () I get null, and if I ask for isChild() I get false,... so what I
> miss?
>
> thank you
>
> >
>

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