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2014/10/16 ¤W¤È 08:24:13
android Programming Glossary: singletonHow to have Android Service communicate with Activity http://stackoverflow.com/questions/2463175/how-to-have-android-service-communicate-with-activity Intents Using AIDL Using the service object itself as singleton In your case I'd go with option 3. Make a static reference to..
Singletons vs. Application Context in Android? http://stackoverflow.com/questions/3826905/singletons-vs-application-context-in-android Recalling this post enumerating several problems of using singletons and having seen several examples of Android applications using.. having seen several examples of Android applications using singleton pattern I wonder if it's a good idea to use Singletons instead.. in this post http stackoverflow.com questions 2709071 singleton pattern with web application not a good idea but applied to..
Using the Android Application class to persist data http://stackoverflow.com/questions/4208886/using-the-android-application-class-to-persist-data problem of losing data in an activity. I created a global singleton in the Application class and was able to access it from the..
Android: Want to set custom fonts for whole application not runtime http://stackoverflow.com/questions/4395309/android-want-to-set-custom-fonts-for-whole-application-not-runtime instantiate your typeface anywhere I would suggest as a singleton somewhere to avoid unnecessary copies setTypeface roboto break..
Activity restart on rotation Android http://stackoverflow.com/questions/456211/activity-restart-on-rotation-android good practice to expose the instance of this class as a singleton and exposing the application variables you're initializing using..
Android - What's the best way to share data between activities? http://stackoverflow.com/questions/4878159/android-whats-the-best-way-to-share-data-between-activities common ways to achieve this Send data inside intent Use a singleton class Use application singleton Static fields HashMap of WeakReferences.. data inside intent Use a singleton class Use application singleton Static fields HashMap of WeakReferences Persist objects sqlite.. . If passing complex objects save an instance in a singleton somewhere else and access them from the launched activity. Some..
Android backup/restore: how to backup an internal database? http://stackoverflow.com/questions/5282936/android-backup-restore-how-to-backup-an-internal-database transactions. I have no idea how to close them from such a singleton class outside of my app's workflow. How to notify the user that..
Android: How to declare global variables? http://stackoverflow.com/questions/708012/android-how-to-declare-global-variables user already successfully authenticates Thanks android singleton global variables state share improve this question I wrote.. of your application. A static variable for instance a singleton is a common Java way of achieving this. I have found however.. essentially the same effect as using a static variable or singleton but integrates quite well into the existing Android framework...
How to communicate between Android tabs http://stackoverflow.com/questions/1088810/how-to-communicate-between-android-tabs extending the Application class and implementing it as a Singleton you get an object that will exist whenever any of your application..
Using static variables in Android http://stackoverflow.com/questions/2475978/using-static-variables-in-android static variables a recommended practice E.g implementing a Singleton pattern in Java I usually do private static A the_instance public.. So think of it as living as long as your app runs. Is Singleton a good idea People have different views. I think it's fine when..
Using the Android Application class to persist data http://stackoverflow.com/questions/4208886/using-the-android-application-class-to-persist-data activities I used. You can pass data around in a Global Singleton if it is going to be used a lot. public class YourApplication..
http://stackoverflow.com/questions/4948152/need-sample-android-rest-client-project-which-implements-virgil-dobjanschi-rest I should use the Service API. I like the idea of having a Singleton ServiceHelper which binds to a Local Service but I am afraid..
Using Singleton design pattern for SQLiteDatabase http://stackoverflow.com/questions/6905524/using-singleton-design-pattern-for-sqlitedatabase Singleton design pattern for SQLiteDatabase I'm rather newbie on Android.. Further you don't need to worry about making a Singleton database helper with ContentProviders. Simply call getContentResolver.. for you in other words there is no need for designing a Singleton pattern to prevent multiple instances from being created . Hope..
Android: How to declare global variables? http://stackoverflow.com/questions/708012/android-how-to-declare-global-variables disagreement I have with those who encourage the use of Singletons rather than subclassing Application. Read it at your own risk... use of Application subclasses is discouraged in favor of Singleton patterns. Somatik also pointed out something of this nature.. Diane in particular expressed with regards to preferring Singleton over Application subclasses. In my disagreement I will be making..
How to have Android Service communicate with Activity http://stackoverflow.com/questions/2463175/how-to-have-android-service-communicate-with-activity There are three obvious ways to communicate with services Using Intents Using AIDL Using the service object itself as singleton In your case I'd go with option 3. Make a static reference to the service it self and populate it in onCreate void onCreate..
Singletons vs. Application Context in Android? http://stackoverflow.com/questions/3826905/singletons-vs-application-context-in-android vs. Application Context in Android Recalling this post enumerating several problems of using singletons and having seen several examples of Android applications using singleton pattern I wonder if it's a good idea to use Singletons.. post enumerating several problems of using singletons and having seen several examples of Android applications using singleton pattern I wonder if it's a good idea to use Singletons instead of single instances shared through global application state.. would have both mechanisms To be honest I expect the same answer in this post http stackoverflow.com questions 2709071 singleton pattern with web application not a good idea but applied to Android. Am I correct What's different in DalvikVM otherwise..
Using the Android Application class to persist data http://stackoverflow.com/questions/4208886/using-the-android-application-class-to-persist-data of a deal. What you described is exactly how I tackled my problem of losing data in an activity. I created a global singleton in the Application class and was able to access it from the activities I used. You can pass data around in a Global Singleton..
Android: Want to set custom fonts for whole application not runtime http://stackoverflow.com/questions/4395309/android-want-to-set-custom-fonts-for-whole-application-not-runtime 0 switch typeface case ROBOTO default You can instantiate your typeface anywhere I would suggest as a singleton somewhere to avoid unnecessary copies setTypeface roboto break case ROBOTO_CONDENSED setTypeface robotoCondensed break..
Activity restart on rotation Android http://stackoverflow.com/questions/456211/activity-restart-on-rotation-android or keyboard visibility changes won't trigger it. It's good practice to expose the instance of this class as a singleton and exposing the application variables you're initializing using getters and setters. NOTE You'll need to specify the name..
Android - What's the best way to share data between activities? http://stackoverflow.com/questions/4878159/android-whats-the-best-way-to-share-data-between-activities share improve this question Here a compilation of most common ways to achieve this Send data inside intent Use a singleton class Use application singleton Static fields HashMap of WeakReferences Persist objects sqlite share preferences file etc... Here a compilation of most common ways to achieve this Send data inside intent Use a singleton class Use application singleton Static fields HashMap of WeakReferences Persist objects sqlite share preferences file etc. TL DR there are two ways of sharing.. of the intent extras user defined objects must implement Parcelable . If passing complex objects save an instance in a singleton somewhere else and access them from the launched activity. Some examples of how and why to implement each approach Send..
Android backup/restore: how to backup an internal database? http://stackoverflow.com/questions/5282936/android-backup-restore-how-to-backup-an-internal-database I'm worried about the following topics Open databases and transactions. I have no idea how to close them from such a singleton class outside of my app's workflow. How to notify the user that a backup is in progress and the database is locked. It might..
Android: How to declare global variables? http://stackoverflow.com/questions/708012/android-how-to-declare-global-variables global in order to avoid login form appearing after the user already successfully authenticates Thanks android singleton global variables state share improve this question I wrote this answer back in '09 when Android was relatively new and.. is how to save state across several Activities and all parts of your application. A static variable for instance a singleton is a common Java way of achieving this. I have found however that a more elegant way in Android is to associate your state.. String state appState.getState ... This has essentially the same effect as using a static variable or singleton but integrates quite well into the existing Android framework. Note that this will not work across processes should your..
How to communicate between Android tabs http://stackoverflow.com/questions/1088810/how-to-communicate-between-android-tabs open each Activity or by extending the Application class. By extending the Application class and implementing it as a Singleton you get an object that will exist whenever any of your application components exist providing a centralized place to store..
Using static variables in Android http://stackoverflow.com/questions/2475978/using-static-variables-in-android static variables in Android In android are using static variables a recommended practice E.g implementing a Singleton pattern in Java I usually do private static A the_instance public static A getInstance if the_instance null the_instance.. goes into the background or pauses but is completely shut down. So think of it as living as long as your app runs. Is Singleton a good idea People have different views. I think it's fine when used appropriately myself. I don't think the answer changes..
Using the Android Application class to persist data http://stackoverflow.com/questions/4208886/using-the-android-application-class-to-persist-data in the Application class and was able to access it from the activities I used. You can pass data around in a Global Singleton if it is going to be used a lot. public class YourApplication extends Application public SomeDataClass data new SomeDataClass..
http://stackoverflow.com/questions/4948152/need-sample-android-rest-client-project-which-implements-virgil-dobjanschi-rest REST request in an Worker Thread of the Activity. Instead I should use the Service API. I like the idea of having a Singleton ServiceHelper which binds to a Local Service but I am afraid that I did not understand the Service concept correct. For..
Using Singleton design pattern for SQLiteDatabase http://stackoverflow.com/questions/6905524/using-singleton-design-pattern-for-sqlitedatabase Singleton design pattern for SQLiteDatabase I'm rather newbie on Android and I'm working on a simple application to get some basic.. you'll need to implement a ContentProvider for your application. Further you don't need to worry about making a Singleton database helper with ContentProviders. Simply call getContentResolver from the Activity and the system will take care of..
Android: How to declare global variables? http://stackoverflow.com/questions/708012/android-how-to-declare-global-variables addressing some criticism and detailing a large philosophical disagreement I have with those who encourage the use of Singletons rather than subclassing Application. Read it at your own risk. ORIGINAL ANSWER The more general problem you are encountering.. conversation with Reto Meier and Diane Hackborn in which use of Application subclasses is discouraged in favor of Singleton patterns. Somatik also pointed out something of this nature earlier although I didn't see it at the time. Because of Reto.. I do wish to disagree extremely strongly with the opinions Diane in particular expressed with regards to preferring Singleton over Application subclasses. In my disagreement I will be making use of concepts best explained in this StackExchange explanation..
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