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I would like to know what causes this if anyone knows. In latest Android Studio 3. If you see this error after moving java files or directories to other locations, then you can guarantee that Android Studio has gotten confused.
Android Studio maintains information about which files are dependent on which other files. And since moving files around is not implemented correctly, moving files causes errors.
This means you not only have to restart, but you need to invalidate those caches to restore or more accurately, rebuild sanity.
There seems to be many causes for this issue. Recently, I added an activity to test with called NewActivity. Those are definitely good things to try, but you may have some other issues you need to resolve before you run those commands.
I think if you put your Activities files to another folder than the default one. You need to import the com. R file to ALL activities using R.
For example, in MainActivity file insert this line:. I was using gradle 3. It was the main culprit. Have you updated your SDK tools recently?
Launch the android SDK manager and make sure you have the latest SDK tools, which is now separate from the platform tools. So the best and effective way is delete the last done xml or drawable in res file.
This is the only way. The effective and right way. Just clean your project and Sync Project with Gradle File. In here you will get a list of anything that is causing issues in your resources and manifest file.
The errors will open up the generated xml files from your build which will show any errors in red. I did have an issue after where Android Studio still showed the error after the fix, even though I could now build and run perfectly fine while the error was still there.
I am running a canary build so putting it down to that for now. Just go to Android Top menu list. I faced this issue when I manually renamed the domain folder of my app.
To fix this issue, I had to. I had to import my R package in android studio. This is a very old question, but it still happens a lot and there is no truly comprehensive answer here.
I have had this problem more times than I want to admit. Importing from Eclipse to Android Studio does not always work smoothly, especially with older versions of Android Studio.
It should look like this for a moderately mature app:. It may not look like this in your IDE. There is a drop-down above the file tree that displays your files in different ways, and it defaults on my system to one called Android that breaks your files out into their different types.
Also make sure that the package tag in your AndroidManifest. If there are errors in either your Gradle files or your AndroidManifest. Gradle files can be broken by upgrading Android Studio sometimes, especially from the pre Sometimes this is because it stops supporting older versions of the Gradle plugin, so you need to update your version numbers.
It can sometimes be hard to find what the current versions are. This is in the dependencies block in the outermost gradle file,.
If your AndroidManifest references a non-existent drawable or string resource or activity, it will break and cause this error. Sometimes if anything references a nonexistent drawable or string resource you will get this error.
If you have a file in your resources that is corrupted, or an invalid xml file, you will get this error. If you have two xml resources with the same name, in directories that do not override each other, you can have this problem.
For instance, you can have the same name in drawable-mhdpi and drawable-xhdpi because they override each other depending on the target device, but if you have the same name in layout and in menu, it will cause a problem.
Rename or delete one of the files. If only some resources are having this problem, those resources are most likely in the wrong directory.
In one case I had to completely reinstall Android Studio. In one case I moved my entire project to a different directory and re-imported it as a new project.
There are a few ways your Gradle file can end up referencing a version of the build-tools that you do not have installed. Correct this by changing Gradle or downloading the appropriate build-tools.
You do this by going to the Build menu at the top and selecting Clean Project. This worked for me. Had the same problem a few times, and this seems to set it right.
Unless you have changed something or called a variable R. This issue usually happens out of nowhere, when it happens to me, so I imagine its just Android studios freaking out.
If you find any red circles with exclamation mark, than you must remove those errors in your code. At last I found this tricky problem is cause by my R.
My project is very a huge one, it supports many multi-languages and multi screen sizes. There are so many resources that my R. The max size of a file in Android Studio is 2.
Started when I added a few images in my drawable folder and tried to access them. Also the images added were having the extension with capital letters.
That seems to have crashed the build, since even if I renamed them, the message was the same and R was inaccessible.
What I did is, in the. But this time the error persisted even after doing all these things and at last i found the culprit.
The problem was in an xml file , where i have given ordinary string value for an android: Messing up things related to resources in xml files is a major reason for this error.
Beware of the fact that it may not be shown as an error in the xml layout file. In most cases the compiler shows you the source of error in the Message.
Try to check it first before attempting other solutions. This was a big headache for me. Try looking really hard at the error report, even the messages titled "info" for any hint about what it might be Click file and then click project structure 2.
If your project ran before you made the changes then comment out the changes you have made and try to rebuild the project. For example - If you are making a list visible with a button click and inserting list values in the adapter, first check if you are able to make it visible or not then check for adapter errors.
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I still really dont know what caused the error to begin with. R in any of my java files. Hey everyone I forgot about asking this question since it was asked so long ago.
I should have accepted my own answer a year ago that is now the comment above this. The issue was with simply that android studio was in such an early stage at the time and as a new developer I never should have never been using it.
Rest assured everything is working fine now and has been. If it is possible please undelete my original answer so I can accept it.
Not finding R isnt your error its an error caused by a Build fault Fix your other errors and you should be fine. I had this this issue too.
Vipassana Vijayarangan Vipassana Vijayarangan 7, 2 10 In the latest versions of Android Studio, at least for me, the following works: Om Sao 1, 11 What was the version of Android Studio you used that time?
Does not work for me Android Studio 0. This just did the trick for me in Android Studio 1. Still works in Android 1.
The code of the. I have also read that this may be caused by an error in the layout. Therefore I also include the code of the layout, which shows no compiler errors and is a pure pre-made layout:.
Furthermore, Im following this tutorial: Thanks and sorry if this is still considered a duplicate post —SOLVED— Im just stupid and, when creating TutorialOne as class, I accidently created the class in the map java instead of com.
There might be an issue with it. This will build your project and create a new bin folder and regenerate the R.
You may have changed your application package name in manifest file. This error comes when the build is not sync properly.
Please sync your project by clicking as shown:. I might have done something to cause this. Most of the time it is due to a bad XML file.
XML files can be layout files, value files, or the Manifest file.
Cannot Resolve Symbol R VideoSolved - cannot resolve symbol R Android Studio
Cannot resolve symbol r - agree, veryHast du schon die Gradle Tasks "rebuild" bzw. Alle meine anderen Projekte, die ohne Werbung nicht haben ähnliche Probleme. Informationsquelle Autor der Antwort Mina Fawzy. R being added by Android Studio or Eclipse Error in xml file. Dieser arbeitete für mich. Scott Biggs 5, 4 42 Error occured after I moved java package into another package. Apr 14, You simply need to do a rebuild and then clean your project.
Thank you, like wise, this was the solution. Check your xml files. For example I had an entry in my strings. Iurii Iurii 2, 17 A missing image one of my XMLs referred to caused this issue for me.
Put the image in the folder, cleaned and R is now happy again. I accidentally had my string defined twice in strings.
X- Thank you for your answer. This really resolved my issue. Scott Biggs Scott Biggs 6, 4 42 Error occured after I moved java package into another package.
Interestingly, in one package R class can be accessed, but it cannot be accessed in package that I moved. In the more recent versions of Android Studio, Invalidate and Restart are now the default menu selection.
This should help at least a few people. I got this error after moving and renaming a project. This solved the R problem after all cleaning and restarting did not.
This takes roughly the same time as getting a cup of coffee - which in turn can be used to take a nice coffee shower with if it still marks R in red Mr Robot 2, 6 24 Open a command terminal, switch to the project directory and execute ".
For example, in MainActivity file insert this line: Ah, and there will be still error message before you first build.
However, you just press build, Android Studio will generate the R file and the build should success. I prefer to debug on real device.
Thanks a lot man: Your code is just scrambled. The answer is fairly simple. That should do the trick.
Also use Git for proper tracking of code. Minto Minto 1, 1 11 And the problem will be resolved. Arunendra Arunendra 1, 15 It should be noted that right clicking on "app" and clicking the synchronise button in the menu does not achieve this.
When something is wrong, you can find out what it is by doing a code analysis run. From the menu at the top choose: Matthew Cawley Matthew Cawley 1, 16 There must have been something stuck in Lint that only this could clear out.
Thank you for this! While this found many general errors, which was expected, the piece that brought down the entire castle was a small Syntax error in an XML file generated by Asset Studio!
Once I resolved this, a Clean Project allowed me to move forward. I have had this with An uppercase letter in my drawable resources.
R being added by Android Studio or Eclipse Error in xml file. Ryan Heitner Ryan Heitner 8, 5 55 I had the issue because there was an error in one of my XML files.
Gundu Bandgar Gundu Bandgar 1, 1 11 Set the new package location for android: The issue will be gone, once the Android studio restarts and builds the fresh index.
Sridhar Sridhar 5, 4 28 Pervy Sage Pervy Sage 5 It should look like this for a moderately mature app: You should normally leave it alone.
This is in the dependencies block in the outermost gradle file, If your AndroidManifest references a non-existent drawable or string resource or activity, it will break and cause this error.
Xml files with reserved words for names can cause this problem. Rename or delete them. TBridges42 TBridges42 1, 12 Pedro 87 2 9. It worked for me too.
I replaces some images in drawable and got that error. Clean Project again and done! Hassan Naqvi Hassan Naqvi 2 I had the same problem, and it happens when I create a new project.
What I do is: That works for me. Elsanty Elsanty 1 9. I had a hard time fixing this myself. Make sure you have no errors in your layout.
Most of the time it is due to a bad XML file. XML files can be layout files, value files, or the Manifest file.
Please check your xml files and try to rebuild the project. Sometimes cleaning the project and rebuilding it also works. The adapter stores each Place suggestion in a PlaceAutocomplete object from which we read the place ID.
Check error code and notify the user of error state and resolution. Pass it to the adapter to enable API access. Disable API access in the client.
Android Studio maintains information about which files are dependent on which other files. And since moving files around is not implemented correctly, moving files causes errors.
This means you not only have to restart, but you need to invalidate those caches to restore. Ask New Question Sign In.
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Answered May 12, How do I solve this error in my Android application: How do I solve the "Cannot symbol R"?
How do I solve an R in Android? How do I resolve radio group rendering problem in android studio? Answered Sep 13, Thank you for your feedback!
An IDE built for professional development. Answered May 30, Hope this will solve your problem.I have had this with An uppercase letter in my drawable resources. For example I had an entry in my strings. Put the image in the folder, cleaned and R is now happy again. Import von Eclipse zu Android Studio funktioniert nicht immer reibungslos, vor allem mit älteren Versionen von Android Studio. Das blaue Start-Icon klicken. Thank you, like wise, this was the solution. Logge Dich hier ein. If it is possible please undelete my original answer so I can accept it. Therefore, even though you immediately corrected the notation after pasting, the debugger has already refreshed. Später soll das noch verbessert werden. More importantly, when you paste code, it immediately runs through a sort of debugger Excuse my bad tech term to show you "presumed errors", which immediately takes in consideration the "Wrong Package", and you get all the errors. This question has been asked before and already has an answer. Es sei denn, Sie haben etwas verändert oder als eine variable R.