When using Android Studio, the source code reports red warnings everywhere, but it is correct when running.

[Abstract: When developing on AS, I encountered this problem. I opened all the Java source files and the right side was all marked in red. I couldn’t find the class and couldn’t reach the method. Because I couldn’t click to jump, I was tangled during development. After a long time, I tried clean, rebuild and other methods but nothing worked. Also]

When I was developing on AS, I encountered this problem. When I opened all the java source files, the right path was marked in red and the class could not be found. , I couldn't find the method because I couldn't click to jump. I struggled for a long time during development. I tried various methods such as clean and rebuild, but none of them worked. I also went online to find tips from experts, but it might not work for me. Another colleague only asked for another AS installation, which was unnecessary and too troublesome. After researching and referring to various methods on the Internet, I am attaching a little trick that I have personally experienced and solved, so as not to panic when encountering such problems and find the wrong direction to solve the problem. (ps: This method was solved with reference to a problem on the Internet, but the original URL cannot be found, so I wrote it here for your reference only)

Small skills article:

1. Click File-> Invalidate Caches / Restart...

2. Restart Gradle and clear the cache

3. After AS restarts, java is no longer popular "everywhere"

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