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Topic # 143926 1-May-2014 18:52
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Hi, Im trying to make a basic app

I was reading this about how to make a settings page for an app http://developer.android.com/guide/topics/ui/settings.html and according to this 

 

     

  • If your app supports versions of Android older than 3.0 (API level 10 and lower), you must build the activity as an extension of the PreferenceActivity class.
  • On Android 3.0 and later, you should instead use a traditional Activity that hosts a PreferenceFragmentthat displays your app settings. However, you can also use PreferenceActivity to create a two-pane layout for large screens when you have multiple groups of settings.
So this means if I want my app to support 2.2 and 2.3 (as alot of devices still have) I need to use the PreferenceActivity class, And if I do will my app still be compatible with 4.0, 4.1, 4.2, 4.3 and 4.4?

Ive tried doing this and have had a bit of trouble :/

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  Reply # 1035080 1-May-2014 19:28
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At least 50% of developers have hair I'd wager :) 


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  Reply # 1035127 1-May-2014 20:41
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Its basically saying that they prefer you to do it the new one on Android three and later, but it is not mandatory.

While I am not an Android developer,   use a Façade pattern to give yourself a common interface, underneath the façade, use a Factory method to return the correct  object.  You'll need to create an object that implements the PreferenceActivity (which as far as I make out is the Deprecated version) and an object that implements the PreferenceFragment (which I think is the new way).  - basically, this is a form of run time binding depending on platform version.


    So in your factory method you detect the version and implement the correct one.  However, looking at PreferenceFragment I can't see why that is not backward compatible, if it is, then you can simplify the above.




Software Engineer

 


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