Re: [android-developers] ListView with "selected" state does not work when list item view has a background

Miha,

On Tuesday, May 21, 2013 12:57:38 PM UTC+4, Miha wrote:

Kostya, how do you handle "checked" states then? I see two possible solutions:

1) in OnItemClickListener, call adapter.setChecked(position), which
sets the checked item position and then calls notifyDataSetChanged()
2) in OnItemClickListener call setChecked on the view itself plus call
adapter.setChecked(position) and define the checked state in the
getView()

I call setChecked directly, because my "checkbox" tracking is in the same layout (although it's not a checkbox)

To track selected items (for getView to do the right thing during scrolling, and to know what items user actions apply to), I'm using a LongSparseArray... Don't think it matters much (except ListView tracks checked items by position, whereas I prefer "stable" database IDs).

I'm not using any choice modes inside ListView, because I also have an ActionMode UI implementation for Android 2.*, and it's abstracted away from the actual list... I guess the usefulness of sharing this is starting to rapidly diminish :)

 

I see option 2 as a minor performance improvement over option1. How
did you handle it?

@Romain, is there a way to use state_activated in API level 10 via
some sort of compatibility package? Could I create such a
compatibility lib myself perhaps?

In my experience the resource system will filter out attributes that aren't present in the actual runtime platform... So for example, you can use android:actionBarStyle=... when running on 2.*... and I expect android:attr_activated is the same way.

-- K

 

Regards,
 Miha.

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