[android-developers] How to make flavor?

I have a script

apply plugin: 'android'

repositories {
    mavenCentral()
}

dependencies {
    compile 'commons-io:commons-io:2.4'
    compile 'com.actionbarsherlock:actionbarsherlock:4.4.0@aar'
    compile 'com.android.support:support-v4:18.0.+'
    compile 'com.google.android.gms:play-services:3.2.+@aar'
    compile project(':ViewPagerIndicator')
    compile project(':AndroidHorizontalListView')
}

android {
    compileSdkVersion 18
    buildToolsVersion "18.1.0"

    productFlavors {
        main {
            packageName "com.example"
        }
        flavor {
            packageName "com.example.flavor"
        }
    }

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

        hospa {
            res.srcDirs = ['hospa/res']
        }

        // Move the tests to tests/java, tests/res, etc...
        instrumentTest.setRoot('tests')

        // Move the build types to build-types/<type>
        // For instance, build-types/debug/java, build-types/debug/AndroidManifest.xml, ...
        // This moves them out of them default location under src/<type>/... which would
        // conflict with src/ being used by the main source set.
        // Adding new build types or product flavors should be accompanied
        // by a similar customization.
        debug.setRoot('build-types/debug')
        release.setRoot('build-types/release')
        flavor.setRoot('build-types/hospa');
    }

    signingConfigs {
        debug {
            storeFile file('../debug.keystore')
        }
    }
}

but when I run assembleFalvorDebug it build a main version app -- it doesn;t contains changes which flavor should have. I think issue in folders structure. I try a lot of different varian but result was the same. Could you please show which folder structure I should have for this case?

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