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Prior to this change, the only way to switch SimpleExoPlayerView was to do: oldView.setPlayer(null); newView.setPlayer(player); This would cause the video renderer to have to transition through oldSurface->noSurface->newSurface, which is inefficient (noSurface requires platform decoders to be fully released). After this change we support: newView.setPlayer(player); oldView.setPlayer(null); This results in direct oldSurface->newSurface transitions, which are seamless on Android M and above. The change also adds some robustness against developers ending up with strange behavior as a result of clearing the player from a view in a different ordering than we expect w.r.t. registering of other listeners. ------------- Created by MOE: https://github.com/google/moe MOE_MIGRATED_REVID=154044976