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

有些項目調試時突然找不到源碼，出現的全是 throw new RuntimeException("Stub!") 點擊download，報錯：all packages are not available for download package id sources android-28 找了好幾個地方，stackOver上的大多是說網絡（不通的）問題，要關閉instant run的問題，關閉pr

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