method - cannot resolve symbol string android studio

Android Studio suddenly cannot resolve symbols (17)

Android Studio 1.3

  1. Open Module Settings
  2. Click on your module under Modules menu
  3. In the properties tab, set the Source Compatibility and Target Compatibility to your java version.

I did nothing else and it worked for me.

Android Studio 0.4.2 was working fine and today I opened it and almost everything was red and the auto-completion had stopped working. I look at the imports and AS seems to be telling me it can't find all of a sudden (offering me the option to remove the unused imports). ( seems to be fine though).

Things I have tried:

  • Rebuilding the project
  • Cleaning the project
  • Syncing with Gradle Files
  • Closing the Project, closing AS and relaunching / reopening
  • File > Invalidate Caches / Restart
  • Examining Lint, didn't see anything obvious
  • Double checking all support libraries are up to date in the SDK manager
  • Examining my Build.gradle, although no changes and it's the same as usual, the way it was working all the time.

Here it is in case it's relevant:

buildscript {
    repositories {
    dependencies {
        classpath ''
apply plugin: 'android'

repositories {

android {
    compileSdkVersion 19
    buildToolsVersion '19.0.0'

    defaultConfig {
        minSdkVersion 8
        targetSdkVersion 19

dependencies {
    compile ''
    compile ''
    compile ''
    compile ''
    compile project(':libraries:facebook')
    compile files('libs/core.jar')

When I hit "Sync with Gradle" and open "Project Settings" I get a red error telling me I have duplicate library references and to remove the unused ones..

My project compiles and runs fine but I really need the autocomplete working!! Does anyone have any suggestions?

Be aware that the name of files and specially folders can result in this error. For instance, if you have a folder "Helpers" and the package for files in this folder is "com.whatever.helpers" it won't result in any compilation error but will cause the Android studio fail to load the symbols in that folder. One typical reason for that is when you name a folder with first capital letter, commit it on Git and later change the folder name to all lower case. The Git system won't recognize the change resulting in a discrepancy between the local and remote repositories that only the new repository clones will be affect by.

For me it was a "progaurd" build entry in my build.gradle. I removed the entire build section, then did a re-sync and problem solved.

Got the same problem today. Fixed it by changing the jdk location in the project structure from \java\jdk1.7.0_05 to \java\jdk1.7.0_25 (which I didn´t know existed until now).

I´m using Android Studio 0.8.6.

I faced similar problem but I followed following steps in my case :-

1).inside project under .idea folder open modules.xml. 2).check if there are two entries for same iml file. 3).delete one of duplicate entry and close android studio or build gradle file again.

In my case it worked. Hope it helps

I got it solved by setting JDK. I got a pop up saying that Setup JDK when I placed mouse over the error.

I had a much stranger solution. In case anyone runs into this, it's worth double checking your gradle file. It turns out that as I was cloning this git and gradle was runnning, it deleted one line from my build.gradle (app) file.

dependencies {
     provided files(providedFiles)

Obviously the problem here was to just add it back and re-sync with gradle.

I have finally figured out what causes this issue.

Actually, you should avoid pushing .idea/libraries folder to your repository. It creates weird stuff in Android Studio which tends to remove all downloaded libraries.

If you have commit history, just recreate all missing library files and avoid them to be committed again. Otherwise, just remove whole .idea folder and reimport it into AS.

I tried everything listed here. Then I checked my androidmanifest.xml I'd had some stoopid mismatched due to folder renames & package renames.

I'm using Android Studio 3.1.4 and I was experiencing such issue when moving from my develop branch with a lower api target to another branch with target api Oreo. I tried the first solution which worked but it is quite tricky, while the second solution did not solve the problem.

My Solution When the problem popped back again I have tried to modify slightly my app gradle file enough to AS to ask me to sync files, and that did the trick. Then I deleted the change.

I guess that "Sync Project with Gradle Files" might work as well but I haven't tried it myself

Hope it helps

In my multi-module project, the problem was that version of "" in module A was "22.0.0", but in B - "22.2.0".

Solution: make sure
1. version of common libraries is same among modules.
2. each of modules compiles without any errors (try to build each of them from CLI).

None of these methods helped me in Android Studio 0.5.8.

My solution was to delete ~/.AndroidStudioPreview directory (in Ubuntu). Sorry, I have no idea where is it in other OS. This directory stores temporary files and Android Studio settings, so I missed all my settings. But it works!

Please check if you have a project path which has special characters like ! (exclamation mark).

In a similar problem that I experienced, this was the root cause - since many Java applications seem not to tolerate such special characters (For e.g. doing a 'gradlew clean' from the terminal would fail and throw a RunTimeException.). None of the other solutions posted online had helped me. But, once I had removed the ! from the path and did a clean build, Android Studio magically worked.

There is a far easier solution built into Android Studio, and it usually works for me without needing any brute force solution mentioned in other answers - so you should try this first:

click on the "gradle" symbol on the right side of Android Studio, and then on the "Refresh all Gradle projects" tool.

Thought i'd throw this out there too:

the thing that worked for me was changing my build variant back to a variant that was working previously. For some reason i had changed this before (and i forgot why).

either way, the best thing to do is to try to remember what you changed that day (it could be something as minor as cleaning, or going back to a previous git commit)...etc.

it also helps to try to resync gradle and force a rebuild.

try to change your build.gradle with these value:

android { compileSdkVersion 18 buildToolsVersion '21.0.1'

defaultConfig {
    minSdkVersion 18
    targetSdkVersion 18