I don"t know why I can"t download it, but exoplayer:exoplayer:2.9.0" can find the jar package, but I can"t find the jar package exoplayer-core:2.9.0. In the past, there was no problem with 2.8.4, but we need to upgrade together. Only one upgrade will cause the following problem. I don"t know what it is, but the reason? Solve the problem online.
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