[android-developers] Re: Is it possible to start an Activity from a non-context class?
Misspoke in my original post. The second paragraph should read: ... use the original activity to start the activity. The problem with this is that the RESULT is sent to the original activity, rather than the utility class. On May 4, 2:02 am, Michael J txaggiemich...@gmail.com wrote: For example, I have an activity that uses a utility class. I would like to be able to start an activity from the utility class and have the activity result sent back to the utility class. The only way I could think of starting the activity was to pass the original activity to the utility class, so that the utility class could use the original activity to start the activity. The problem with this is that the activity is sent to the original activity, rather than the utility class. I also thought of actually making the utility class an activity itself, but that would make using the utility class much more complicated. Thanks for any advice! -- 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 athttp://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 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: Is it possible to start an Activity from a non-context class?
On May 4, 10:40 am, TreKing treking...@gmail.com wrote: Why are you doing this? What purpose is your utility class serving that it requires starting and retrieving data from another activity? Here's the usage. Let me know if there's a much easier way of doing this. In my application, I'm referencing a RESTful web service which requires token authentication. My utility class is simply a utility for sending a REST request. If the request responds with an invalid authentication message, I would like the utility to be able to initiate a LogIn activity to request a new authentication from the user. Once the LogIn activity has completed, I would like the utility class to be able to handle the LogIn activity's result, and attempt the request again. On May 4, 10:42 am, Timo Prill timo.pr...@googlemail.com wrote: just pass your context over to the utility class via getter/setter or in constructor... Like I said before, I tried this, but the problem is that the activity result cannot be sent to the utility class, which is what I need. -- 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: Is it possible to start an Activity from a non-context class?
Yeah thats what I usually do. I'm also a fan of static methods that get passed a Context object. You can also have your application or activities extend an interface, and have your methods expect that interface. The important thing is that your utility code trigger an execution thread, with access to the right context. I have a related question. What are the consequences, and best practices, of starting activities from a non activity context? The documentation says: http://developer.android.com/reference/android/content/Context.html#startActivity(android.content.Intent) Note that if this method is being called from outside of an Activity Context, then the Intent must include the FLAG_ACTIVITY_NEW_TASK launch flag. This is because, without being started from an existing Activity, there is no existing task in which to place the new activity and thus it needs to be placed in its own separate task. This seems to work, but I'm betting it has some interaction with http://developer.android.com/guide/topics/manifest/activity-element.html android:launchMode but that already confuses me... -MK On May 4, 8:42 am, Timo Prill timo.pr...@googlemail.com wrote: just pass your context over to the utility class via getter/setter or in constructor... Am 04.05.2010 17:40, schrieb TreKing: On Tue, May 4, 2010 at 2:02 AM, Michael J txaggiemich...@gmail.com mailto:txaggiemich...@gmail.com wrote: For example, I have an activity that uses a utility class. I would like to be able to start an activity from the utility class and have the activity result sent back to the utility class. Why are you doing this? What purpose is your utility class serving that it requires starting and retrieving data from another activity? --- -- TreKing - Chicago transit tracking app for Android-powered devices http://sites.google.com/site/rezmobileapps/treking -- 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 -- 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 athttp://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 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
Re: [android-developers] Re: Is it possible to start an Activity from a non-context class?
On Tue, May 4, 2010 at 11:56 AM, Michael J txaggiemich...@gmail.com wrote: In my application, I'm referencing a RESTful web service which requires token authentication. My utility class is simply a utility for sending a REST request. If the request responds with an invalid authentication message, I would like the utility to be able to initiate a LogIn activity to request a new authentication from the user. Once the LogIn activity has completed, I would like the utility class to be able to handle the LogIn activity's result, and attempt the request again. It sounds to me like you're giving this utility class a responsibility it should not have. If it's purpose is to send requests (and report back errors) then that's all it should do. I don't know how you've set up your code, but I would expect a main activity that is responsible for doing the request using the utility class. If that fails (which the utility class would report), the calling activity would then launch the login activity to get the details, which you would get back in onActivityResult, which the main activity would then pass on to the utility class to try the request again. Again, I don't know the details of your code, but I don't see why this class would need to start and get results from an activity. - TreKing - Chicago transit tracking app for Android-powered devices http://sites.google.com/site/rezmobileapps/treking -- 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: Is it possible to start an Activity from a non-context class?
Yea, I've definitely considered that option. I suppose my whole reason for this is to avoid needing to handle an error from the utility class in each of my activities. My application is one main TabActivity that contains 4 tabs, each being it's own activity. You've made me realize that it might be possible for me to have the activities request authentication from the main TabActivity, which would be responsible for starting the login activity. In which case I would only need the main TabActivity to handle the login activity's response. Does this sound like a logical design? Sorry for being an idiot, I'm still trying to get a hold on the Android framework... On May 4, 12:25 pm, TreKing treking...@gmail.com wrote: On Tue, May 4, 2010 at 11:56 AM, Michael J txaggiemich...@gmail.com wrote: In my application, I'm referencing a RESTful web service which requires token authentication. My utility class is simply a utility for sending a REST request. If the request responds with an invalid authentication message, I would like the utility to be able to initiate a LogIn activity to request a new authentication from the user. Once the LogIn activity has completed, I would like the utility class to be able to handle the LogIn activity's result, and attempt the request again. It sounds to me like you're giving this utility class a responsibility it should not have. If it's purpose is to send requests (and report back errors) then that's all it should do. I don't know how you've set up your code, but I would expect a main activity that is responsible for doing the request using the utility class. If that fails (which the utility class would report), the calling activity would then launch the login activity to get the details, which you would get back in onActivityResult, which the main activity would then pass on to the utility class to try the request again. Again, I don't know the details of your code, but I don't see why this class would need to start and get results from an activity. --- -- TreKing - Chicago transit tracking app for Android-powered deviceshttp://sites.google.com/site/rezmobileapps/treking -- 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 athttp://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 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
Re: [android-developers] Re: Is it possible to start an Activity from a non-context class?
On Tue, May 4, 2010 at 12:35 PM, Michael J txaggiemich...@gmail.com wrote: Does this sound like a logical design? I haven't used Tabs, but from your description, yes. And it would surely be better than what you were trying to do in the beginning. Sorry for being an idiot, I'm still trying to get a hold on the Android framework... No apologies necessary - we're all here to learn. - TreKing - Chicago transit tracking app for Android-powered devices http://sites.google.com/site/rezmobileapps/treking -- 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
