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2014/10/16 ¤W¤È 08:24:13
android Programming Glossary: singletonsSingletons 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.. singleton pattern I wonder if it's a good idea to use Singletons instead of single instances shared through global application.. can easiliy be re created when you actually need them. Singletons are a nightmare for testing and if lazily initialized will introduce..
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... objects etc. It works great. I am not arguing that using Singletons cannot work fine or are not a legitimate alternative. I am arguing.. or are not a legitimate alternative. I am arguing that Singletons do not provide as strong a contract with the Android system..
SharedPreferences value is not updated http://stackoverflow.com/questions/10186215/sharedpreferences-value-is-not-updated as the commit itself. As SharedPreferences instances are singletons within a process it's safe to replace any instance of commit..
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.. framework engineer thanks. We are bit by bit removing all singletons from our project in favor of lightweight task scoped objects.. Visibility has been mentioned as another problem and since singletons imply global random access to shared state subtle bugs may arise..
Should accessing SharedPreferences be done off the UI Thread? http://stackoverflow.com/questions/4371273/should-accessing-sharedpreferences-be-done-off-the-ui-thread loading though... once loaded SharedPreferences are singletons and cached process wide. so you want to get it loaded as early..
getApplication() vs. getApplicationContext() http://stackoverflow.com/questions/5018545/getapplication-vs-getapplicationcontext no need to subclass Application . In most situation static singletons can provide the same functionality in a more modular way. If..
Static references are cleared--does Android unload classes at runtime if unused? http://stackoverflow.com/questions/5105097/static-references-are-cleared-does-android-unload-classes-at-runtime-if-unused shouldn't happen otherwise this common way of implementing singletons wouldn't work on any JVM right Any idea why this is happening..
Android: How to declare global variables? http://stackoverflow.com/questions/708012/android-how-to-declare-global-variables Diane ends with The framework itself has tons and tons of singletons for all the little shared data it maintains for the app such..
Android: Accessing resources without an Activity or Context refeerence http://stackoverflow.com/questions/7531959/android-accessing-resources-without-an-activity-or-context-refeerence Also this completely ruins various Design Patterns such as singletons having to supply parameters when getting the instance. Putting..
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.. 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 subclassing android.os.Application and obtaining it.. our project in favor of lightweight task scoped objects which can easiliy be re created when you actually need them. Singletons are a nightmare for testing and if lazily initialized will introduce state indeterminism with subtle side effects which..
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.. for the app such as caches of loaded resources pools of objects etc. It works great. I am not arguing that using Singletons cannot work fine or are not a legitimate alternative. I am arguing that Singletons do not provide as strong a contract with.. great. I am not arguing that using Singletons cannot work fine or are not a legitimate alternative. I am arguing that Singletons do not provide as strong a contract with the Android system as using an Application subclass and further that using Singletons..
SharedPreferences value is not updated http://stackoverflow.com/questions/10186215/sharedpreferences-value-is-not-updated will block until all async commits are completed as well as the commit itself. As SharedPreferences instances are singletons within a process it's safe to replace any instance of commit with apply if you were already ignoring the return value. You..
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.. with Dianne Hackborn and yes I realize she's an Android framework engineer thanks. We are bit by bit removing all singletons from our project in favor of lightweight task scoped objects which can easiliy be re created when you actually need them... moving calls to getInstance from one scope to another . Visibility has been mentioned as another problem and since singletons imply global random access to shared state subtle bugs may arise when not properly synchronized in concurrent applications...
Should accessing SharedPreferences be done off the UI Thread? http://stackoverflow.com/questions/4371273/should-accessing-sharedpreferences-be-done-off-the-ui-thread be doing a blogpost with sample code of how to do this. Regarding loading though... once loaded SharedPreferences are singletons and cached process wide. so you want to get it loaded as early as possible so you have it in memory before you need it...
getApplication() vs. getApplicationContext() http://stackoverflow.com/questions/5018545/getapplication-vs-getapplicationcontext shouldn't need to subclass Application There is normally no need to subclass Application . In most situation static singletons can provide the same functionality in a more modular way. If your singleton needs a global context for example to register..
Static references are cleared--does Android unload classes at runtime if unused? http://stackoverflow.com/questions/5105097/static-references-are-cleared-does-android-unload-classes-at-runtime-if-unused not really deep into Java's memory model but I suppose that shouldn't happen otherwise this common way of implementing singletons wouldn't work on any JVM right Any idea why this is happening exactly PS one can work around this by keeping global references..
Android: How to declare global variables? http://stackoverflow.com/questions/708012/android-how-to-declare-global-variables Application subclass as well. Again there is no difference. Diane ends with The framework itself has tons and tons of singletons for all the little shared data it maintains for the app such as caches of loaded resources pools of objects etc. It works..
Android: Accessing resources without an Activity or Context refeerence http://stackoverflow.com/questions/7531959/android-accessing-resources-without-an-activity-or-context-refeerence code. Plus all those potential hanging references. Also this completely ruins various Design Patterns such as singletons having to supply parameters when getting the instance. Putting a static reference So is there a way or does the whole community..
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