AlertDialog: How To Remove Black Borders Above and Below View

Question

This question has been asked before: AlertDialog custom title has black border

But was not answered satisfactorily - and is missing some information.

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Answer 1

In my case, that border was caused by the theme of the parent Activity for the AlertDialog. To get rid of the border completely, give it a different theme (in this case, Holo):

AlertDialog.Builder builder = new AlertDialog.Builder(
                                new ContextThemeWrapper(this, android.R.style.Theme_Holo)
                              );

This fixed it for me. Hope this helps!