Here's the sort of thing I'm experiencing:
When I hover over any of the attributes like android:id, for example, I see the following:
Attribute android:id is not allowed here
I've tried cleaning the project, syncing the project with Gradle files, rebuilding the project, and lastly, invalidating caches and restarting. Yet, nothing I do seems to fix it.
Any help would be highly appreciated.
Edit: Problem was solved by deleting, recloning, and rebuilding the project.
I know this question has been asked & answered before. But, none of those answers work for me. Eclipse crashed in the middle of a build and keeps erasing the R.java file. I have tried to clean and rebuild. Does not help. I was using SDK build tools 19.0 upgraded to 20.0. Does not help. I didn't touch anything in the XML files and I do not see any errors in the XML files.
Try another IDE e.g Idea and check if this is due to your Eclipse malfunction not your SDK that you have updated recently
I my case there was something wrong with my XML usually my layout files, when you have a problem in your XML files the clean option does not work properly, check your XML files ( layout and manifest ) and after that clean your project.
Hope this help you
I did get my R.java back. There was a jpeg for another project stuck in a drawable directory. Don't know how it got there. and, still lots of unexplained errors though.
All my other errors were from switch statements using R.something_menu.icon for cases handling user responses. I got a message that as of ADT 14, switch statements can no longer be used. I had to migrate to if...else It works. Don't know why. But, it solved the problem & saved my code.
After adding new items in strings.xml, quite often they don't start working immediately in Android Studio's Preview.
Couldn't resolve resource #string/faq_customer_service
Preview looks like this:
I've obviously tried to re-build the project, and even run gradle clean assembleDebug, but it doesn't seem to help. On emulator & real device the newly-added string resources do work.
Any trick to force Android Studio to reload the resources so that the correct texts show up in Preview?
The only reliable way I've found so far is reloading the project / restarting Android Studio.
Quickest way to do that is File → Invalidate caches / Restart... → Just Restart.
Feel free to post better solutions!
you DO NOT need to close the entire project. It's just way too much for so little problem.
Just refresh the preview (click the "refresh" button)
provided from https://stackoverflow.com/a/34754707/3339597
Right click on project and Synchronize '...Project' worked for me.
There are three steps for solving this problem
Build -->Clean Project
Build -->Rebuild Project
Restart android studio
Couldn't resolve resource #string/faq_customer_service
or
Couldn't resolve resource #id/visible
or
Couldn't resolve resource #id/masked
The solution is if you implement TextInputLayout the above problems may arise ... so Simply add those id or strings to xml files as their property.
Render Problem:
Couldn't resolve resource #string/hello_blank_fragment
Just refresh the Layout.
work for me..
I was having a project open in Android studio. It was generated by the wizard and working fine.
I did some small changes to activity_main.xml and when I changed back to MainActivity.java i get the error in several places that it cannot resolve R. I might have done something to cause this. But I´m not sure what since it appered when I edited the xml.
Does anyone know what might be the solution to this?
I can find the R.java in r/release/packege/com/ and it looks fine.
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.
In addition, make sure you do not have a drawable with an invalid name. I had a drawable with a numeric filename and that didn't sit well with Android so it failed to compile R.java.
Downgrade Your Gradle Plugin Version
No amount of cleaning, rebuilding and restarting would do the trick for me.
The only thing that did the trick was downgrade our Gradle version from 3.4.0-alpha02 to 3.2.1.
So, instead of:
dependencies {
classpath 'com.android.tools.build:gradle:3.4.0-alpha02'
}
We used:
dependencies {
classpath 'com.android.tools.build:gradle:3.2.1'
}
After making that change and then doing a Gradle sync, everything worked.
Not sure if it's related to the alpha release or to that version or if changing your Gradle version at all just forces a refresh that otherwise cannot be done with the other commands, but there ya go.
Make sure in your AndroidManifest.xml the package name is correct. That fixed the problem for me when my R.whatever was marked red!
Try to clean the project by doing the following:
If you are using Windows, open CMD, cd to your project directory and run gradlew clean.
I just had this problem and the reason was that after editing the layout android studio automatically added an import to the source files:
import android.R
Of course the main R class has not all the symbols in your layouts, which made everything a red mess.
Removing that line solved for me.
EDIT:
Seems like eclipse had the same problem early on.
I sometimes get this after updating Android Studio. Not always straight away but after a while (perhaps after a restart of the program).
Here is what has worked for me: Tools - Android - Sync project with Gradle files.
For some reason just clicking the "Sync now" link that shows up after changing the build.gradle file has not done any change for me. Even though the messages says approximately the same thing.
I had the same problem because in my strings.xml I forgot to escape a apostrophe. Use " \' " never " ' " in xml file!
I had that same problem crop up, too (most recently while I was at lunch--came back and WTF?). And since this was a simple Hello, World program, there wasn't many places these errors could hide. The XML files looked fine--I hadn't even touched the manifest. A clean did nothing.
So I commented out a section of my layout.xml to try to narrow down the problem. Sure enough, the errors went away.
And then I simply UNcommented out exactly what I had commented...and everything was hunky-dory. Strange! Perhaps there was some lingering issues that needed to be touched in order to cause a rebuild of the layout file. You'd think basic stuff like that wouldn't happen these days, but they do.
One more thing! It's possible that something may happen to Java as well. It's very hard to know the status of the Java run-time environment; just easier to start again. So here's one more thing to try: restart your computer, restart Android Studio, AND THEN Invalidate Caches and Restart. Yep, the whole-hog.
When all else fails restarting android sometimes helps. During the start files are loaded afresh and this enables detection of the R
This problem occurs when you rename the package name.
After renaming the package name, you must change the older package
name to a newer one.
For me it solved the problem once I changed that.
After that, you might get errors in xml files, that you have to change
the package name there also.
That's it.
I just had the R problem and after a few hours found that the problem was my regional spelling as used in one of my xml files. The problem word was behaviour, which is spelled behavior by Americans.
I am Australian and we are taught ye olde English way of spelling certain words and so I looked past it a number of times before the penny dropped.
Its a small thing, but it can easily sneak up and bite you on the nether regions and is hard to spot and can waste a lot of time.
In my case I had just added some new image files to the drawable folder and accidentally put a GIF in there with my PNGs. I had not incorporated them into the project at all yet. I removed the GIF and then did a clean and rebuild. That fixed it for me.
I had this exact problem when importing a Udacity Example Program. The Message Pane in Android Studio said the error was failing to load a .PNG in a sub-directory deep in the Project Files.
Turns out the PNG with all of the sub-directory path names was greater than the name length limit defined by Windows 7 (260 characters). I gave the Project a shorter name - to free up some space - and then Android Studio happily compiled.
After you tried make project, clean project, rebuild project but still doesn't work.
Try restart Android studio
I got this error when code my Android app:
I do nothing to this strings.xml file.
Can anyone fix this error?
I do refresh and clean but nothing change.
Thanks.
As per your Comment. Here i post my answer. For this problem. Try below steps -
First just remove the project from your workspace.
And, after just import that project again into your work-space.
Sometimes, it happened for me. I tried to do this way. It works.
Hope this helps you.
Most Often this happens to me too.
Try to remove project from workspace and re-import it.
Hope it will work :)
It seems you have used localization is your app.
There are different possibilities for the error to occur:
1)You have not localized all of the strings.
2)Other problems are persisting and you are not ignoring them.
Solution:
Right Click on your project----> Java Compiler-----> Errors/Warning---> Remove all errors
let me know if this works.
What version of the SDK are you compiling against? According to this list, you need at least Android 2.3 for Vietnamese localisation.