setCustomSelectionActionModeCallback

Sets a selection action mode callback on a TextView. Also this method can be used to fix a bug in framework SDK 26/27. On these affected devices, the bug causes the menu containing the options for handling ACTION_PROCESS_TEXT after text selection to miss a number of items. This method can be used to fix this wrong behaviour for a text view, by passing any custom callback implementation. If no custom callback is desired, a no-op implementation should be provided. Note that, by default, the bug will only be fixed when the default floating toolbar menu implementation is used. If a custom implementation of Menu is provided, this should provide the method Menu#removeItemAt(int) which removes a menu item by its position, as given by Menu#getItem(int). Also, the following post condition should hold: a call to removeItemAt(i), should not modify the results of getItem(j) for any j Menu interface. However, it is required, and going to be called by reflection, in order to display the correct process text items in the menu.

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