android activity源码疑问，如何找到类的方法的实现？

Question

如图所示 类activity的方法都是throw RuntimeException,这是怎么回事？

Answer 1

Because you have not downloaded the corresponding SDK source code, you can see it after the following two steps
1. Determine the SDK version you are currently using, which is compileSdkVersion

2. Go to SDKManager to download and update the sources of the corresponding version