Thanks for writing.
In the current version the legend is based on the Android ListView. Unfortunately the list does not provide many customization options. We can expose the list view adapter but this still won't allow horizontal or other more specific layouts. We will revise the internals of the legend and provide a more flexible API in a future release.
Fortunately the legend is extremely simple at the moment and you can implement it manually fairly quickly. Just create a list view and pass it an adapter that translates from a chart series to a list view item. Then you can use the chart series collection itself.
Please write again if you have more questions.
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