I've just installed Android Studio and either the files were not correct in the first place or I've messed up the import process.
My project's gen folder is showing the package as com.example.something and my src folder is showing the package as com.myname.something as it should. How can I change the name of the package in the gen folder to match that of the src folder?
I think as a result I'm getting R errors and it's driving me mad!
Thanks muchly.
Try to call from menu Build - > Rebuild Project.
I created a new project and imported the files manually in the end. No R errors now either. If anyone knows of an easier way please let me know though!
The newest version of the gradle plugin (0.4.3) should solve these problem. More information here
Make sure to use "com.android.tools.build:gradle:0.4.+" as dependency in your gradle.build file to get always the latest version.
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.
I am creating new Android application in my Eclipse.Application is created but the R.java file is not creating,I am getting errors R cannot be resolved.
IS there any issue in my android-sdk?
Thanks
Try Clean and Build
if it does not work please close the eclipse and open it again
It should work.
You can try following things.
1)in project tab(topbar) there is clean option try that, if your code is fine it will regenerate R.java file
2)if you imported import android.R.* statements, remove it, You should add your.project.name.R.* instead;
3) there may be errors in your xml files, check error viewer it should show errors there.
Check this. have you imported import android.R;in your project. If have means remove this import android.R;. clean and Rebuild your project
import android.R;
No generated R.java file in my project.
R.Java not generated.
R.java file not getting generated.
When you clean and build your project R.java gets generates automatically. Try the above links.
There are 2 ways to solve this problem:
1) In Project Explorer, Right Click on your Project, then go to Build
Project
2)in project tab Go to clean option, if your code is fine it will regenerate R.java file
Clean your project and try again it will help u
From Eclipse Menu Bar;
Enable Project -> Built -> Built Automatically
I copied my program at work to another computer so I can work on it here. When I try to create New project from existing code I get the dreaded R. cannot be resolved to a variable.
Apparently, R.java is supposed to be in the gen folder but it isn't. Eclipse tells me to import R.java but we all know that isn't correct.
None of the many answers I have seen explain or solve my problem. Any help is greatly appreciated.
I've cleaned the project - as advised - many times after doing other things but it does nothing.
try doing something like this type R and give a control + space. It will give few suggestions among which you may have the R.java file related to your project. Import that R instead of the default android.R . Before doing all these check if your project shows any errors in the xml files. If you have any errors in any of your xml files the R.java file will not be created
R. java gets generated .(Thats what gen stands for 'gen folder') Do not import R.java as suggested by Android, clean your project and rebuild it and the R.java file will be created in the gen folder unless your project has errors.
Let me know how it goes
Do not modify the source (such as importing R.java) if it worked on another computer.
Right click the project and select Android Tools -> Fix Project Properties.
If you do not have errors in your xml files, this should work.
EDIT:
If you do not mind other IDEs, I think IntelliJ IDEA is good for Android developing.(compared to Eclipse) and it should save a lot problems.
Maybe you can also try doing this instead of creating 'New project from existing code':
In your eclipse go to:
File -> Import -> General -> Existing Projects into Workspace -> browse to your project -> Finish
Hope that helps. :)
Try importing your R class manually. Go to a java file in one of your activities and try this in your import statements.
import com.yourpackage.name.R;
Aside from the other solutions, try changing the build of your app through
properties > Android
then revert it back to your original build.
or just in case, try checking your layout or res folder
If I'm not mistaken, R couldn't be built if there is something wrong with the res folder.
Aside from the other solutions, try to delete the package that is causing the problem under the "gen" folder and let eclipse rebuild it.