Unresolved Reference
How to Fix Unresolved Reference Android Studio – This occurs because Android Studio cannot create the R.java file properly.
Solving “Unresolved Reference” Problem In Android Studio in two ways:
1. Click the Builds menu –> Rebuild Project
If method 1 doesn’t work, try the following:
2. Click the File menu –> Invalidate caches / Restart
But if you can’t use the method above, try checking the following specific problems:
Unresolved Referense : permission
for example, an error that occurs in the code (which I copied from someone’s website), I found errors such as:

While I’ve included in the manifest file:
<uses-permission android:name=”android.permission.ACCESS_FINE_LOCATION” />
So what must be changed is, before the error “Manifest.permission” is written, add the words “android”, so that it becomes:
“android.Manifest.permission.ACCESS_FINE_LOCATION“.
Error will gone.
Unresolved reference: FusedLocationProviderClient
If this is the case, add the following lines to the file build.gradle:
implementation "com.google.android.gms:play-services-location:15.0.1"
Then clik Sync Now.
Done. I hope this article is useful.
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