In an ExpandableListView , is there a way to hide the group indicator for groups with no children?
Source: Tips4all
Source: Tips4all
I have a 2.67 GHz Celeron processor, 1.21 GB of RAM on a x86 Windows XP Professional machine. My understanding is that the Android emulator should start fairly quickly on such a machine, but for me it does not. I have followed all instructions in setting up the IDE, SDKs, JDKs and such and have had some success in staring the emulator quickly but is very particulary. How can I, if possible, fix this problem?
The android:groupIndicator property takes a state enabled drawable. That is, you can set different image for different states.
ReplyDeleteWhen the group has no children, the corresponding state is 'state_empty'
See these reference links:
http://developer.android.com/reference/android/widget/ExpandableListView.html#attr_android:groupIndicator
http://developer.android.com/reference/android/R.attr.html#state_empty
For state_empty, you can set a different image which is not confusing, or, simply use transparent color to display nothing...
Add this item in your stateful drawable along with others....
<item android:state_empty="true" android:drawable="@android:color/transparent"/>
So, your statelist can be like this:
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_empty="true" android:drawable="@android:color/transparent"/>
<item android:state_expanded="true" android:drawable="@drawable/my_icon_max" />
<item android:drawable="@drawable/my_icon_min" />
</selector>
In case you are using an ExpandableListActivity, you can set the groupindicator in onCreate as follows:
getExpandableListView().setGroupIndicator(getResources().getDrawable(R.drawable.my_group_statelist));
I have tested this to be working.
As mentioned in a different answer, since Android treats an un-expanded list group as empty, the icon is not drawn even if the group has children.
ReplyDeleteThis link solved the problem for me:
http://mylifewithandroid.blogspot.com/2011/06/hiding-group-indicator-for-empty-groups.html
Basically you have to set the default drawable as transparent, move the drawable into your group view as an ImageView and toggle the image in your adapter.