Sources for Android API 23 Platform not found (Android Studio 2.0)
<p>Android Studio doesn't redirect me to API sources correctly. When I hit any function it decompiles .class file bytecode instead of accessing the right file from sdk/sources tree. 
<a href="https://i.stack.imgur.com/7pywB.png" rel="noreferrer"><img src="https://i.stack.imgur.com/7pywB.png" alt=""></a>
Hitting "download" and "refreshing" options does nothing. It's particularly annoying for implementing listeners since it generates functions' headers without variables' manes from documentation (i.e. var1, var2 etc.). I have installed API 23 (SDK platform, tools, docs, sources). I have set compile and target SDK to 23.
 I tried to reinstall SDK tools, update AS from canary channel, invalidate cache but nothing helped so far. 
I switched to API 21 and it works fine. </p>

<p>What am I missing?</p>

<p>My build.gradle:</p>

<pre><code>apply plugin: 'com.android.application'

android {
    compileSdkVersion 23
    buildToolsVersion '23.0.2'

    defaultConfig {
        applicationId "com.myapp.app"
        minSdkVersion 10
        targetSdkVersion 23
        versionCode 1
        versionName "1.0"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    compile fileTree(include: ['*.jar'], dir: 'libs')
    testCompile 'junit:junit:4.12'
    compile 'com.android.support:appcompat-v7:23.3.0'
    compile 'com.android.support:design:23.3.0'
    compile 'com.squareup.picasso:picasso:2.5.2'
    compile project(':volley')
    compile 'com.jakewharton:butterknife:7.0.1'
}
</code></pre>

<p>Below you can find gradle output for a blank project (without 3rd party libs) with the same API 23 set and the same behaviour.</p>

<pre><code>Executing tasks: [clean, :app:generateDebugSources, :app:generateDebugAndroidTestSources, :app:mockableAndroidJar, :app:prepareDebugUnitTestDependencies]

Configuration on demand is an incubating feature.
Incremental java compilation is an incubating feature.
:clean
:app:clean
:app:preBuild UP-TO-DATE
:app:preDebugBuild UP-TO-DATE
:app:checkDebugManifest
:app:preReleaseBuild UP-TO-DATE
:app:prepareComAndroidSupportAnimatedVectorDrawable2330Library
:app:prepareComAndroidSupportAppcompatV72330Library
:app:prepareComAndroidSupportDesign2330Library
:app:prepareComAndroidSupportRecyclerviewV72330Library
:app:prepareComAndroidSupportSupportV42330Library
:app:prepareComAndroidSupportSupportVectorDrawable2330Library
:app:prepareDebugDependencies
:app:compileDebugAidl
:app:compileDebugRenderscript
:app:generateDebugBuildConfig
:app:mergeDebugShaders
:app:compileDebugShaders
:app:generateDebugAssets
:app:mergeDebugAssets
:app:generateDebugResValues UP-TO-DATE
:app:generateDebugResources
:app:mergeDebugResources
:app:processDebugManifest
:app:processDebugResources
:app:generateDebugSources
:app:preDebugAndroidTestBuild UP-TO-DATE
:app:prepareDebugAndroidTestDependencies
:app:compileDebugAndroidTestAidl
:app:processDebugAndroidTestManifest
:app:compileDebugAndroidTestRenderscript
:app:generateDebugAndroidTestBuildConfig
:app:mergeDebugAndroidTestShaders
:app:compileDebugAndroidTestShaders
:app:generateDebugAndroidTestAssets
:app:mergeDebugAndroidTestAssets
:app:generateDebugAndroidTestResValues UP-TO-DATE
:app:generateDebugAndroidTestResources
:app:mergeDebugAndroidTestResources
:app:processDebugAndroidTestResources
:app:generateDebugAndroidTestSources
:app:mockableAndroidJar
:app:preDebugUnitTestBuild UP-TO-DATE
:app:prepareDebugUnitTestDependencies

BUILD SUCCESSFUL
</code></pre>