Importing Facebook library in Android Studio: Could not find property 'ANDROID_BUILD_SDK_VERSION'

I want to import a library project into my app but whenever I try to do so , Android Studio doesn't recognise it

It also gives me errors in build.gradle ..

The Library is : PagerSlidingTabStrip ....

Here are some pictures :

> > >

I have been trying to make it work for 3 days so far !! Please Help Me :)

EDIT:

apply plugin: 'android-library'

dependencies {
compile 'com.android.support:support-v4:19.0.0'
}

android {
compileSdkVersion Integer.parseInt(project.ANDROID_BUILD_SDK_VERSION)
buildToolsVersion project.ANDROID_BUILD_TOOLS_VERSION

defaultConfig {
    minSdkVersion 8
    targetSdkVersion Integer.parseInt(project.ANDROID_BUILD_TARGET_SDK_VERSION)
}

sourceSets {
    main {
        manifest.srcFile 'AndroidManifest.xml'
        java.srcDirs = ['src']
        res.srcDirs = ['res']
    }
}
}

 apply from: 'https://raw.github.com/chrisbanes/gradle-mvn-push/master/gradle-mvn-push.gradle'

EDIT2 :

FAILURE: Build failed with an exception.

* What went wrong:
A problem occurred configuring project ':Sahertoday'.
> Could not resolve all dependencies for configuration ':Sahertoday:_debugCompile'.
> Could not find com.astuetz:pagerslidingtabstrip:1.0.1.
 Required by:
     Saher-3:Sahertoday:unspecified

* Try:
 Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get         more log output.

 BUILD FAILED

First of all, you can add this dependency to your project, without compiling the lib locally.

dependencies {
    compile 'com.astuetz:pagerslidingtabstrip:1.0.1'
}

Otherwise if you would like to compile this lib locally, you have to define these keys in gradle.properties in the root.

ANDROID_BUILD_TARGET_SDK_VERSION=19
ANDROID_BUILD_TOOLS_VERSION=19
ANDROID_BUILD_SDK_VERSION=19

EDIT

There is also a GUI way for doing this. It is accessed by selecting the module facebook in the project tree and pressing f4.
Also you can just right-click the facebook and go to Open Module Settings near the bottom.

It is shown in the pictures. The numbers in the picture are top sdk version at the time of writing.

There is a simpler solution. The constants like ANDROID_BUILD_SDK_VERSION can be replaced with normal version "numbers". So instead of

android {
    compileSdkVersion Integer.parseInt(project.ANDROID_BUILD_SDK_VERSION)
    buildToolsVersion project.ANDROID_BUILD_TOOLS_VERSION

    defaultConfig {
         minSdkVersion 8
         targetSdkVersion Integer.parseInt(project.ANDROID_BUILD_TARGET_SDK_VERSION)
    }

..file can look like this:

android {
    compileSdkVersion 19
    buildToolsVersion '19.1.0'

    defaultConfig {
         minSdkVersion 15
         targetSdkVersion 19
    }

Go the facebook folder which you have imported in your project. Copy the gradle.properties file and paste in into your facebook module.It will remove the errors.

For those who ran into same problems while adding libraries and still can't get it work. The following local include of the .aar file worked for me:

• Just download the .aar file from the maven repo manually.
• In Android Studio go to File -> new Module -> import .JAR or .AAR package and select your downloaded .aar file.

Android Studio does the rest (in the build.gradle) for you. Maybe clean and rebuild your project.

apply plugin: 'com.android.library'

android {
    compileSdkVersion 22
    buildToolsVersion "22.0.1"

    defaultConfig {
        minSdkVersion 8
        targetSdkVersion 4
    }

    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.txt'
        }
    }
}

dependencies {
    compile 'com.android.support:appcompat-v7:22.2.1'
}