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In the task switcher, a user can choose a task by tapping or pulling down the task image. In the later case, the task image already occupies the full screen, so the launcher suppresses an app transition animation by calling ActivityOptions#makeCustomAnimation. However, due to task animation lockdown, this API has no effect when the task opens or closes (the API still works as expected when an activity starts within a same task). The new API ActivityOptions#makeCustomTaskAnimation lets us to customize an animation to run when the task opens or closes. Test: atest ActivityTransitionTests Bug: 170251468 Change-Id: I445e64fdbf6be2d4fdf1936844bcd27dbdf8d69a