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I am getting an error all over my Android Project, this project I have been working on for several months now and all of a sudden all my android projects have errors.

I get a "cannot find symbol R" when I call something like: 

 setContentView(R.layout.activity_driver_login);

This was never a problem before.

In My android Manifest file I get an error "URI is not registered" 

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"

I have this problem as well:

enter image description here

and when I click on the App button that I referenced in the picture, I get this.

enter image description here.

Why did this happen all of a sudden and how can I fix this? This isn't specific to this project, this problem occurs on all of my other projects and even on a separate machine I get these errors.

Note I have tried rebuilding the project, but nothing changes.

Mitchell Yuen
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  • Maybe you should try referring to [this](https://stackoverflow.com/questions/17421104/android-studio-marks-r-in-red-with-error-message-cannot-resolve-symbol-r-but) question – Alon Yeager Jul 29 '19 at 16:48

1 Answers1

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So this isn't exactly an answer to the above question, but what I did do that got me back to work, was that I put the code on another machine that I installed Android studio on and the Code worked, and I can compile without any errors. So my feeling is that if you come across the problem mentioned above, then backup your code as it is, uninstall and reinstall Android Studio.

Mitchell Yuen
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