Android Studio suddenly cannot resolve symbols

Question

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 android.support.v4 all of a sudden (offering me the option to remove the unused imports). (android.support.v7 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 {
        mavenCentral()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:0.7.+'
    }
}
apply plugin: 'android'

repositories {
    mavenCentral()
}

android {
    compileSdkVersion 19
    buildToolsVersion '19.0.0'

    defaultConfig {
        minSdkVersion 8
        targetSdkVersion 19
    }
}

dependencies {
    compile 'com.android.support:support-v4:19.0.0'
    compile 'com.android.support:gridlayout-v7:19.0.0'
    compile 'com.android.support:appcompat-v7:19.0.0'
    compile 'com.google.android.gms:play-services:4.0.30'
    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?

Answer 1

Another way is to download JDK 1.7 and change the path from Android Studio in the error message..and choose Home folder who is contained in Jdk 1.7 folder

Answer 2

In my multi-module project, the problem was that version of "com.android.support:appcompat-v7" 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).

Answer 3

Struggled with the same problem for a couple hours this morning. Building my project from command line seems to have done the trick for me.

Exact steps -

1. Cloned fresh repository (no Android studio files are in repo)
2. Built debug project from command line ( ./gradlew clean assembleDebug )
3. Open Android Studio, import project

To check if it worked, look in your projects exploded-bundles folder, inspect a library and find the classes.jar. If it is expandable, then everything is going to be ok.

edit - I found after doing a clean within Android studio, it broke again. So if you have to clean, you will need to do this process again.

Answer 4

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

Answer 5

None of the things mentioned earlier here did actually work for me. But then I found this menu entry in the file menu Invalidate Caches/Restart which appears to have fixed the problem.

I don't really know what happened in the background but when Android Studio started up again the status bar said Indexing... for a minute or so which apparently did wonders.

For reference I'm using Android Studio 0.5.4.

Answer 6

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.