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I am new to Gradle, I was trying to create a Gradle plugin, I followed all the instructions I found, but got this error at the end, I don't understand why part of the package name cannot be resolved.
And somehow it has become like this now. I'm really confused and don't know what to do, can anyone please explain why? How can I solve it?
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Close Android Studio project File->Close Project
then go to project directory in AndroidStudioProjects folder then find .gradle folder and just delete it.
Now reopen AndroidStudio and open Project . This may help
Just Try this one, package name changed successful and app working fine.
This problem occurs when code is copied including the package name from any other place.
Make sure, you are using package name of your own project.
Else, go for Clean and rebuild.
I got your problem, you cannot use word "android" for your project name. Create a new project and select any other name.
Ok, so I decided to import my github project into my other machine on AS. The problem however is that AS seems to completely forget it's an Android project and treats the project as a simple directory. I can't build, rebuild or even run my project. Additionally my file structure is gone.
I've tried importing based on external models but my Android Manifest can't seem to recognize my strings resource folder either. So importing is out of the question.
Any help is appreciated thanks.
It's because you're missing a lot of the files that AndroidStudio creates with you start a new project.
A simple way to fix this will be to create a new project with the same name, package name, all that, and then just copy over your app folder.
When you reopen the project it will recognise it.
this happened to me due to that the file called build.gradle and other similar files wasn't in the root directory like when I opened my imported project I see these files :
but it should be like this :
so I navigated to the directory that contains the files in the above photos and imported that file as an android project and I succeeded, but there may other reasons for your problem , so you should clarify.
You do not have a build.gradle in the root folder of the project, maybe that is the reason.
Without the build.gradle file android studio cannot perform a correct import of the project.
I have map Project in Eclipse IDE and I Cleaned It From Project Menu.It deleted mY BIN Folder and also Gen Folder.Now I Have tried Much BY Build Manually and also from Android Toold To Fix Project Properties But It is Not fixing the Problem and In Source Files R is Red underlined and Bin and Gen Folder are Not Being Created again.Please any oNe Help me to To Get Out OF this issue.
There may be Some Reasons :-
1.from Project-> checked Build Automatically.
2.There Should not any error in your xml otherwise R file will not build automatically.
3.Refresh the project & Restart eclipse.
First backup(e.g. zip) your whole workspace before you start experimenting. Then try to remove IDE specific files e.g. .project .classpath and setup it again. If it fails create new project with similar configuration and simply copy your libraries and source code into new project. Eclipse IDE is pure magic sometimes.
If you have imported this project, then try import as a general project, not as android project. then in build path see if all libraries are present, then run as android application
you have to try till you succeed process.
Try following steps:-
Make sure there is no error any any of your .xml files .. check in
Problem section..
Make sure all your impoert are correct, Eclipse sometimes do import
android.R; on its own, so remove that..
If that doesnt succed make some changes in Manifest file say remove a
word save it then again add that word save it.. I know it doesnot
make sence as code but making changes in Manifest files rebuilds the
workspace an so is the auto generated files. then clean build your
project.
Restart Eclipse as last resort..
try the following steps to help us
remove if imported import android.R; and after like example if your application package name is com.example.project you need import like import com.example.project.R;
I'm trying the new Android Studio. I've exported a project from eclipse, using the build gradle option. I've then imported it in Android Studio. The R.java file under gen has a j in a little red circle on it. And in my source files, I get "cannot resolve symbol R" wherever I have a reference to a resource, e.g. "R.layout.account_list" etc.
I have never used Intellij before. Would appreciate any help as there obviously aren't many answer yet about Android Studio. Thanks!
Press F4 into Project Structure, Check SDKs on left
Click Modules ---> Source Tab, check gen and src as sources
PS: The answer over a year old and the menus have changed.
File -> invalidate caches
then
Restart application
None of the answers on the web so far have helped. Build > Make Project did not work for me. For me it was as simple as choosing this other option (on Android Studio 1.3.1):
Build > Make Module 'module name'
In my case I had an Activity file imported from Eclipse that had the line:
import android.R;
So all of my R classes were resolving to the SDK, as soon as I commented out that line everything compiled correctly to my package. I only noticed the issue when I was moving the project from my Mac to my Windows machine.
This issue starting occurring for me when I started working with build.gradle to incorporate the data necessary (signingConfigs) to build a signed .apk. After what appeared to be a successful build from the command line, I discovered that going into any class using R.* that all R.* references were unresolved.
The answers here didn't help me. I decided to re-import the project and it magically fixed the issue. File/Import Project... and select the build.gradle file in my apps root folder. I would love to know why re-import fixed this :)
This is probably due to a failed resource build
Once the issue is fixed, a mere Build > Rebuild Project will do the trick
Goto File -> Settings -> Compiler now check use external build
then rebuild project
I've been frustrated on many occasions with this problem, especially when intergating a project library as part of another project. In the most recent occurrence of this plagued problem, my Android lib project was using a WebView. It turns out that Gradle builds the R.class file in a sub directory called "web" whose path does not have anything to do with my source code path. When I imported this, my problem was gone. What have I learned? In the future, simply do a file search for R.class and note the path where it is located. Then import the package into your code using that path. It really sucks that you have to manually perform this. Gradle should automatically import packages it generates.
I was also facing the same issue and I went through lot of answer on stackoverflow. Then i found one solution which help me resolve this issue.
Check package name in AndroidManifest.xml file. I forgot to change it while copy pasting another project into new project.
At first check if there is import android.R; in top of your class this happens when auto import in enable in android studio.
after that comment all lines of your code that you use R variable (you can comment entire class or ...)
then run application it regenerates R variable and you can uncomment your code.
Here's what worked for me in IntelliJ (Not Studio), in addition to the replies presented above:
You need to attach an Android facet to an existing Android module. To do this, select the module from the module list in 'Module Settings', hit the '+' button on top and select 'Android'. See https://www.jetbrains.com/idea/webhelp/enabling-android-support.html.
The solution is to open project structure window. [by press command+; on mac ox s. i don't what's the key shortcut for other platforms. you should be able to find it under "File" menu.]
and click "Modules" under "Project settings" section, then your project is revealed, finally mark the generated R.java as Sources.
I am using Intellij idea 14.0 CE.
The generated R.java is located at build/generated/source/r/debug/com/example/xxx
Really not easy to find for the first time.
Follow the five steps below:
Step 1 ===>Delete(CTRL X) the additional tag(s) in XML manifest file.
Step 2 ===>Open Build-->Clean project.
Step 3 ===>Open XML manifest file and past the last additional tag(s) like:
Tag Manifest file example:
(<uses-permission android:name="android.permission.VIBRATE"></uses-permission>)
Step 4 ===>Step 2 again.
Step 5 ===> Open Tool-->Android-->Sync project with 'Gradle'.
I have had the same problem but after all the steps it's work for me.
On IntelliJ 14
Check if the generated sources are excluded. Usually in Project Structure -> [module] -> Paths -> Compiler output: "Inherit compile output path"
My problem was that I had file 'default.jpg' in drawable folder and for some reason every resource was not resolved. Fixed after deleting that file!
You should check all your files if it don't have errors and again rebuild your project in:
Build > Rebuild Project.
Or in:
File > Settings > Build, Execution, Deployment > Compiler
Check use external build and after rebuild the project.
After you tried Clean and Rebuild without success, check your res folder for corrupted files.
In my case a corrupted .png file caused all the trouble.
Regarding the following, from Crossle Song's answer
Press F4 into Project Structure, Check SDKs on left
Click Modules ---> Source Tab, check gen and src as sources
Despite the message "We will provide a UI to configure project settings later....etc" this worked for me.
None of these answers helped me!
My problem was not a problem! The program could compile completely and run on the device but the IDE has given me an annoying syntax error. It has underlined the lines of codes that included "R.".
The way that I could solve this issue:
I just added these three classes in "myapp/gen/com.example.app/" folder:
BuildConfig
package com.example.app;
public final class BuildConfig {
public final static boolean DEBUG = true;
}
Manifest
package com.example.app;
public final class Manifest {
}
R
package com.example.app;
public final class R {
}
I solve that problem setting JAVA_HOME, CLASSPATH.
People sometimes skip JAVA_HOME and CLASSPATH when setting Java_path.
So try to check Environment Variable.
CLASSPATH -> .;
JAVA_HOME -> C:\Program Files\Java\jdk(version) or where Java installed
and then check the xml file which can have error(Do not naming well-known things such as button,text etc)
In my case (Linux, Android Studio 0.8.6 ) the following helps :
File > Project Structure > Modules > select main module > select its facet > Generated Sources
change value of "Directory for generated files:"
from
MY_PATH/.idea/gen
to
MY_PATH/gen
Without that code is compiled, apk is build and run successfully
but Android Studio editor highlights mypackage.R.anything as "cannot resolve" in all sub-packages classes
I had the same problem and got it fixed by deleting an extra library.
To do try this solution go to File > Project Structure (on a mac you can use the command "Apple ;")
Then select app on the left tab. Go to the dependencies tab and delete the extra library.
check the build tools version in build.gradle(for module app). Then go to android sdk manager see if the version is installed if not install it or change the build tools version to the one which is installed like below.
android {
buildToolsVersion "22.0.1"
..
..
..
}
The solution posted by https://stackoverflow.com/users/1373278/hoss
above worked for me. I am reproducing it here because I cannot yet comment on hoss' post:
Remove import android.R;
from your activity file in question.
My setup:
Android Studio 1.2.2
Exported project from one Mac to Git (everything was working). I then imported the project on another Mac from Git. Thats when it stopped resolving the resource files.
I tried everything on this thread:
invalidating cache and restart
Delete .iml files and .idea folder and reimport project
Clean and Rebuild project
Nothing worked except removing import android.R; from my activity java file.
To avoid this issue in the future add .idea folder to your .gitignore file. There is a nice plugin from git for gitignore in Android Studio. Install this plugin and right click in .idea > Add to .gitignore
just clean project and then sync your project with gradle file.
In my case, I found that "android.R.layout.account_list" was referenced instead of "R.layout.account_list". Simply remove "android." can fix the problem. Hope this help because sometimes you may overlook when you are too focusing.
In my case:
I had to Copy Reference the R file; i.e. right click gen/<package>/R and Copy Reference. Then paste that over the R in your code where it fails to resolve.
That solved it for me (after trying everything else here). Still not sure why it worked to be honest.
I had this same issue. The package name was wrong in two of the following three files. I manually updated the package name and everything started working again.
gen/com/example/app/BuildConfig.java
gen/com/example/app/Manifest.java
gen/com/example/app/R.java
I'm not sure what caused them to change as I've never modified these files before.
Had this error when importing project from Eclipse. The reason was some of the xml files had errors. Check ALL your XML files for errors. Including androidmanifest.xml, and values, themes, styles, layouts folders, etc. Warnings in xml are ok, but errors will generate this error.
Afterwards, do a Clean Project and rebuild.
For me, with Android Studio 1.5.1, the solution was to recreate the whole project with a slightly different name.
I think it didn't handle the app name "Kommentator_AS", because several places the package was named"Kommentator" instead.
This question already has answers here:
Developing for Android in Eclipse: R.java not regenerating
(64 answers)
Closed 9 years ago.
In Eclipse, I've created a project from a source and now it shows errors - "R cannot be resolved to a variable". From what I found here, I had cleared and rebuilt the project, but still the R file doesn't appear in the /gen folder.
Any ideas?
Dont worry. First you may clean the project, then run the project. If this does not work then follow the following links:
Here is the best way to solve this problem: [Android Development- Where is my R.Java file?][2]
R.java not regenerating
R cannot be resolved - Android error
R cannot be resolved to a variable
R cannot be resolved to a variable -- mailing list entry
Fixed: R cannot be resolved to a variable
If Clean/Rebuild Project doesn't work try to check our package name in AndroidManifest.xml.
The problem "R cannot be resolved" happens when you change your package name in the AndroidManifest.xml file. It uses your Android package name to create a subdirectory under the "gen" directory where it stores the R.java file.
For me the error got fixed by making some changes in Android SDK Manager.
Whatever be the latest API level available, install its "SDK Platform". For me latest API level available was 16, so I installed its's SDK Platform as shown in the image below. It works fine now.
Cheers, Mayank
Did you just update both sdk and adt(from 21 to 22), then you need to install a new item: Android SDK Build-tools
Refer to:
Eclipse giving error, missing R.java file after recent update
For me somehow the Project properties; Android; Project Build Target was not set. I chose a Android version there (e.g. 4.2) and it fixed it.
for me, the best solution to suggest to people that have problems with the "R" file would be to try the next steps (order doesn't matter) :
update ADT & SDK , Eclipse and Java.
remove gen folder , and create it again .
do a clean-project.
right click the project and choose android-tools -> fix-project-properties .
right click the project and choose properties -> java-build-path -> order-and-export. make sure the order is :
Android 4.3 (always the latest version)
Android private libraries
android dependencies
your library project/s if needed
yourAppProject/gen
yourAppProject/src
make sure all files in the res folder's subfolders have names that are ok : only lowercase letters, digits and underscore ("_") .
always make sure the targetSdk is pointed to the latest API (currently 18) , and set it in the project.properties file
For me, there was a missing slash at the end of my SDK. In Eclipse > Preferences > Android > SDK Location
For example, change
/home/matt/android-sdk-linux
to
/home/matt/android-sdk-linux/
your android manifest must start with correct package
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="HERE - Correct package NAME"
android:versionCode="1"
android:versionName="1.0" >`
I got similar problem and solution I found out was in resources any of
the file aka background, sound etc must not contain capital letters or
any special symbol other than _
What you really need to do it just install "build-tools" from sdk manager,
and r.java will be generated automatically.
I had the same error. Error was that, I had placed a file in res/raw folder with invalid filename.
As soon as I corrected the file name to a valid one, error was resolved!
Allowed characters for naming a file:-
1. a-z
2. . _
3. 0-9
4. no capital letters
Capital letters were the issue in my case!
Sometimes you can accidentially add an import to "R", so if at the top of your code you see some weird import about that that you did not add yourself, delete the reference, and everything should go back to normal
My problem was strange and took some time to find. Somehow the package of the src file changed so that the last entry in the package was deleted. So for example initially my class MyActivity.java was in package com.abc.client.test.app but after I added a user permission, the app got removed and the package was renamed to com.abc.client.test. I don't know how it happened. Renaming the package and putting the java file in the correct place fixed the problem.
I found this problem when trying to run the Notepadv3 programme from Googles 'first lesson'..
For me it was an issue with the xml file, due to the API level I was using. I renamed each case of Match_Parent to the older type of Fill_Parent. Oh and if you have already auto-built the project then you need to delete 'import android.R' on NoteEdit.java and Notepadv3.java, clean the project (click 'Project', then 'clean...') before saving.
Solved it for me. Came from this post Android NDK r4 san-angeles problem
Can't believe Google dosen't warn of this problem - I have been setting up another PC to start programming again and even with a bit of prior knowledge this was a pain.. How do you set the API when importing an existing project??? Can't see where there is any dialogue option when you 'File' 'Import' etc ..
Scamparelli
Check the androidmanifest.xml file and layoutfolder xml files. They should be created properly as the starting and ending clause in xml should be placed properly. Update the files, clean and build. And all set!
I had this problem and none of the other guides helped, and then I realized I didn't have the java jdk installed on my system. If you haven't done this either go download the version corresponding to the version of eclipse you installed (x86 or x64)
It is possible you have an error in your *.xml files: layouts and etc.
Try to modify AndroidManifest file.
For example add space and delete this space. After this OPERATION, save project. Resources will be refreshed. It can help.
I solved the problem with resolving R resource on fc19.x86_64 and ADT v22.0.5-757759 by installing additional libraries after Fedora and ADT upgrade.
yum install ld-linux.so.2
yum install libstdc++.so.6
yum install libz.so.1
Those libraries are required by adb (Android Debug Bridge version 1.0.31).
Then restart Eclipse and perform project clean Project->Clean check project you would like to clean.
Hope it helps :)
Project > Clean...
usually regenerates R.java file located in gen/com.mypackage
In my case, R.java wasn't getting generated because of a hierarchical parent error, which in turn was cured by updated one or more Eclipse plugins (Go Eclipse-->Help-->Check for Updates)
I got this error when I added a js file to the res folder.
An error indicator was set on the res folder icon. In all the classes where I used R I got this error.
I moved the js file to the assets folder and everything worked.
Problem was eclipse was not generating R.java.
To resolve this issue please go to project->clean... and select your project and select ok and then clean and build project and import your package name R file(Ex com.demo.R). It works.
This can happen when the android naming convention isn't followed. Check if you have placed a file/photo into one of the android folders and make sure that the file name contains only lower case letters
I know this is an old question but I just solved my own version of it and perhaps this might help someone.
After two days of tearing my hair out with this, I finally got around it by deleting the raw folder, then recreating it and dropping the file(s) back in.
After that, another Project > Clean and it at last compiled.
I got this when I renamed a project. Although the project is renamed, some references are not. Clearing lint, and then rerunning lint helped. (Right click project > Android Tools > Clear Lint Markers, then Run Lint)
My setup was broken after a recent update where the SDK build tools need to be installed separately after the SDK installation. So build tools update + Eclipse restart fixed this for me.
Credit goes to the Android reply here
When other solutions fail, select your project and delete it. MAKE SURE YOU DO NOT REMOVE FILES FROM DISK.
Then use file>import>existing android code into workspace, and select the location of your project.
I been having this and i did trace it back to the layout files.. It happend to me again however i could not find noting in the layout files. I looked in the string.xml and there was it.. one of the string names started with cap and that was causing the problem.
Fix any XML formatting errors in the XML Files in your /res/menu folder.
Might be a compile time error from the XML file being improperly formatted.