Android Studio报错：all packages are not available for download package id sources android-28

有些项目调试时突然找不到源码，出现的全是 throw new RuntimeException("Stub!") 点击download，报错：all packages are not available for download package id sources android-28 找了好几个地方，stackOver上的大多是说网络（不通的）问题，要关闭instant run的问题，关闭pr

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