Add double tap to go forward/backward in DefaultPlayerUIController

[PierfrancescoSoffritti]

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[rajeefmk]

@PierfrancescoSoffritti
If you notice the youtube app, its buggy most of the time since half the time, I wasn't sure where to tap and until the tap is made, the control views also doesn't come up.

1. Are we going with similar approach of double tap on screen ?
2. Or should we introduce the -10 & +10s icons to the left and right of the play/pause button ? (Similar to what Amazon prime does ? (The iOS youtube app also has a similar approach except that the +10 and -10s are on the bottom bar).

[PierfrancescoSoffritti]

Solution number 2 is basically already implemented, using setCustomAction1 and setCustomAction2. It's just a matter of doing seekTo(time +- 10). Users of the library can take care of that.

I think solution 1 is more interesting. It shouldn't be too hard to achieve, all is needed are 2 transparent views that cover one half of the screen each. These views can then be used to detect double taps.

I think the trickiest thing to implement (but i may be wrong) may be the detection of multiple double taps. eg: if the user taps 4 times on the right view, the player should seek to currentTime + 20 instead of currentTime + 10.

[rajeefmk]

Ha. That's interesting. I just checked out the latest youtube app and the double tap issue seems to be fixed and it's working beautifully.

Also, about the multiple double tap, I think once the first double tap activates the fast forward (backward) mode, then the player doesn't differentiate between single/double tap. I was able to increment in single 10s counts also.

Let's try and emulate the exact behavior of the native app. Would be happy to take this up.

[PierfrancescoSoffritti]

You're right. After the first two taps it's only one to skip 10 seconds.

Sounds great to me, thanks for helping :)