Example of using support v4 library with android gradle plugin

build.gradle

buildscript {
    repositories {
        mavenCentral()
    }

    dependencies {
        classpath 'com.android.tools.build:gradle:+'
    }
}

apply plugin: 'android'
dependencies {
    //provided by android gradle plugin
    compile 'com.android.support:support-v4:+'
    //your other dependencies
}