“R cannot be resolved to a variable”? [duplicate]

Answer 1

What you really need to do it just install "build-tools" from sdk manager, and r.java will be generated automatically.

Answer 2

My problem was strange and took some time to find. Somehow the package of the src file changed so that the last entry in the package was deleted. So for example initially my class MyActivity.java was in package com.abc.client.test.app but after I added a user permission, the app got removed and the package was renamed to com.abc.client.test. I don't know how it happened. Renaming the package and putting the java file in the correct place fixed the problem.

Answer 3

your android manifest must start with correct package

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="HERE - Correct package NAME"
    android:versionCode="1"
    android:versionName="1.0" >`

Answer 4

Did you just update both sdk and adt(from 21 to 22), then you need to install a new item: Android SDK Build-tools

Refer to: Eclipse giving error, missing R.java file after recent update

Answer 5

I got this when I renamed a project. Although the project is renamed, some references are not. Clearing lint, and then rerunning lint helped. (Right click project > Android Tools > Clear Lint Markers, then Run Lint)

Answer 6

When other solutions fail, select your project and delete it. MAKE SURE YOU DO NOT REMOVE FILES FROM DISK.

Then use file>import>existing android code into workspace, and select the location of your project.