Android Studio - Cannot resolve symbol 'firebase'

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I'm currently upgrading an app to the new Firebase version. I followed the guide, included classpath '' in the dependencies of my project build.gradle as well as compile '' among others in the dependencies of my module build.gradle and also apply plugin: '' at the end of that file.

I get a "cannot resolve symbol 'firebase'" in my imports i.e. import;. Those are not errors that appear when building, so this seems to be working, but they are visible in the code editor of Android Studio.

The imports worked just fine a couple of days ago (except for FirebaseAuth, which was under maintenance). I did not change anything about the code since then (except trying to upgrade to 9.0.2, which lead to the same result). The only thing I did was update some components of the Android SDK, but I can't remember which. The Android SDK as well as Google Repository and Google Play Services are of the newest version. Rebuilding, cleaning and invalidate caches / restart had no effect.

Any ideas how to fix this?

You need to add this dependency in your build.gradle(app)

compile 'com.firebase:firebase-client-android:2.5.0'

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Now with New Android Studio ,Its so easy to add Firebase to your Project.

Below are Simple Steps-

1. On Android Studio’s Tools menu, you’ll see an entry that reads Firebase.

2. Select this, and a Firebase Assistant pane will open to the side of your code editor:

3. On this pane, click the arrow beside ‘Authentication’, and you’ll see a step through for ‘Email and Password Authentication’.

4. Click the ‘Connect to Firebase’ button.

Your browser will open with a ‘Request for Permissions’ dialog:

5.Click ‘Allow’, and then after a ‘Success!’ screen, you’ll be given a dialog with which to connect to Firebase.

6.You will see Connected .Its Done !

For more on Firebase refer here.

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You can open and use the Assistant window in Android Studio by following these steps:

  1. Click Tools > Firebase to open the Assistant window. And it will guide you for sync firebase and your project.

How to solve the error 'Cannot Resolve Symbol' in Android Studio , When you work in Android Studio 1.1.0, the build.gradle project does not successfully compile the Mobile Quality Assurance SDK. We would like to show you a description here but the site won’t allow us.

Make sure you fulfill the following prerequisites before adding firebase to your project.

  1. For working with Firebase you should install Android Studio 1.5 or higher.
  2. Download the latest Google Play services SDK from through Android SDK Manager.
  3. The device should be running Android 2.3 (Gingerbread) or newer, and Google Play services 9.2.0 or newer.

I find out all this after hours of struggle, so thought of sharing with others.

Source: Adding Firebase to your Android App

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Invalidating cache didn't work for me. But deleting .idea/libraries worked like magic.

More info here:

Solved, If your code uses this class, the exception on the IDE "Cannot resolve symbol '​Activity Manager'" will appear due to the absence of importing  Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. Learn more Android Studio: Cannot resolve symbol 'raw'

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