Access issues in an Android app

I remember reading somewhere that Scala cannot access >protected
static< members. This is a know limitation of interoperability with
java, there is a ticked on track with the consensus it wont be fixed.
You could try to work around by writing a java class that exposes the
required protected static members and access them via your wrapper.

On Wed, Mar 10, 2010 at 5:45 PM, Nolan Darilek wrote:
> Hi, all. I'm having issues calling into the Android API from Scala, and
> suspect that perhaps the accessibility rules for variables may be
> conflicting somehow, but I'm not sure.
>
> I'm writing code that performs different contact lookups for different
> Android API versions, since how contacts are looked up changed in V5. Here's
> the code I have:
>
>          val column = if(sdkVersion >= Build.VERSION_CODES.ECLAIR)
>            ContactsContract.PhoneLookup.DISPLAY_NAME
>          else
>            Contacts.PeopleColumns.DISPLAY_NAME
>          name = cursor.getString(cursor.getColumnIndex(column))
>
> I get the following with this code:
>
> [error]
> /home/nolan/Projects/Spiel/src/main/scala/info/spielproject/spiel/telephony.scala:34:
> value DISPLAY_NAME is not a member of object
> android.provider.ContactsContract.PhoneLookup
> [error]             ContactsContract.PhoneLookup.DISPLAY_NAME
> [error]                                          ^
> [error] one error found
>
> The API docs here seem to suggest that this should work, though:
>
> http://developer.android.com/reference/android/provider/ContactsContract...
>
> Now, when I chase DISPLAY_NAME through the javadoc, I see that it is
> actually defined in ContactsContract.ContactsColumns:
>
> http://developer.android.com/reference/android/provider/ContactsContract...
>
> which is declared as a protected interface. This would seem to explain why I
> can't access this constant on PhoneLookup, though I don't see why it should
> work in Java and not in Scala.
>
> Compare this to Contacts.PeopleColumns, the method for Android 1.5 and below
> which at least compiles:
>
> http://developer.android.com/reference/android/provider/Contacts.PeopleC...
>
> which is a public static interface.
>
> So am I doing something wrong? Is the PhoneLookup javadoc wrong, and should
> I not be able to access DISPLAY_NAME there? Or is there some Scala trick I
> need to use to access this constant?
>
> Here's another tutorial that uses Contacts.DISPLAY_NAME. This doesn't seem
> to work in Scala either, same error:
>
> http://www.higherpass.com/Android/Tutorials/Working-With-Android-Contact...
>
> So it looks like I'm doing this correctly according to several sources, but
> it just isn't working at all.
>
> Thanks.
>
>
>

Indeed!
http://lampsvn.epfl.ch/trac/scala/ticket/1806
And it is in the Java interoperability FAQ as well!
http://www.scala-lang.org/faq/4

On Wed, Mar 10, 2010 at 9:33 PM, Lex <lexn82@gmail.com> wrote:

I remember reading somewhere that Scala cannot access >protected
static< members. This is a know limitation of interoperability with
java, there is a ticked on track with the consensus it wont be fixed.
You could try to work around by writing a java class that exposes the
required protected static members and access them via your wrapper.

On Wed, Mar 10, 2010 at 5:45 PM, Nolan Darilek <nolan@thewordnerd.info> wrote:
> Hi, all. I'm having issues calling into the Android API from Scala, and
> suspect that perhaps the accessibility rules for variables may be
> conflicting somehow, but I'm not sure.
>
> I'm writing code that performs different contact lookups for different
> Android API versions, since how contacts are looked up changed in V5. Here's
> the code I have:
>
>          val column = if(sdkVersion >= Build.VERSION_CODES.ECLAIR)
>            ContactsContract.PhoneLookup.DISPLAY_NAME
>          else
>            Contacts.PeopleColumns.DISPLAY_NAME
>          name = cursor.getString(cursor.getColumnIndex(column))
>
> I get the following with this code:
>
> [error]
> /home/nolan/Projects/Spiel/src/main/scala/info/spielproject/spiel/telephony.scala:34:
> value DISPLAY_NAME is not a member of object
> android.provider.ContactsContract.PhoneLookup
> [error]             ContactsContract.PhoneLookup.DISPLAY_NAME
> [error]                                          ^
> [error] one error found
>
> The API docs here seem to suggest that this should work, though:
>
> http://developer.android.com/reference/android/provider/ContactsContract.PhoneLookup.html
>
> Now, when I chase DISPLAY_NAME through the javadoc, I see that it is
> actually defined in ContactsContract.ContactsColumns:
>
> http://developer.android.com/reference/android/provider/ContactsContract.ContactsColumns.html#DISPLAY_NAME
>
> which is declared as a protected interface. This would seem to explain why I
> can't access this constant on PhoneLookup, though I don't see why it should
> work in Java and not in Scala.
>
> Compare this to Contacts.PeopleColumns, the method for Android 1.5 and below
> which at least compiles:
>
> http://developer.android.com/reference/android/provider/Contacts.PeopleColumns.html
>
> which is a public static interface.
>
> So am I doing something wrong? Is the PhoneLookup javadoc wrong, and should
> I not be able to access DISPLAY_NAME there? Or is there some Scala trick I
> need to use to access this constant?
>
> Here's another tutorial that uses Contacts.DISPLAY_NAME. This doesn't seem
> to work in Scala either, same error:
>
> http://www.higherpass.com/Android/Tutorials/Working-With-Android-Contacts/4/
>
> So it looks like I'm doing this correctly according to several sources, but
> it just isn't working at all.
>
> Thanks.
>
>
>

--
Daniel C. Sobral

I travel to the future all the time.