The goal is to implement a selection principle that is used in the Google Photo App:
It is an official method defined in the Material Design guidelines for gestures.
On a grid press an hold the finger on a cell [1] and wait. The layout canges slightly to indiacte the dragmode and then the drag can start [2] without lifting the finger across the grid. The cells will be selected as seen at [3].
An attempt to create this function with CustomListView was not successful since the layout change in the transition from longlick to touch couldn't be achieved. The Gesture library and Klaus's example were considered but somehow didn't work in this case.
It would be helpful if someone could help to get a grip on the MD "Long-press drag" gesture.
It is an official method defined in the Material Design guidelines for gestures.
On a grid press an hold the finger on a cell [1] and wait. The layout canges slightly to indiacte the dragmode and then the drag can start [2] without lifting the finger across the grid. The cells will be selected as seen at [3].
It would be helpful if someone could help to get a grip on the MD "Long-press drag" gesture.