Create pre build event to copy files to assets folder in Android application

I have this project structure: ProjectFolder/IosFolder,AndroidFolder,CommonFolder Now android app uses files from it's assets folder. But we decide to make Common folder for the same files.

Could you help me to make function witch will copy files from Common folder(this folder is under my project, so in Android Studio I don't see it) to android assets folder before app will be built?

In Common folder will be some .json files and font files.

As I understand, i need to write this function in my build.gradle file something like that:

task copyFiles(type: Copy)

    copyFiles {
        description = 'Copy files'
        from 'Common/'
        into 'Android/{projectName}/app/src/main/assets'
    }

Here is my file:

apply plugin: 'com.android.application'

repositories {
    mavenCentral()
}

android {
    compileSdkVersion 23
    buildToolsVersion "23.0.2"

    defaultConfig {
        applicationId "amc.amc_mobile_promo2"
        minSdkVersion 17
        targetSdkVersion 23
        versionCode 1
        versionName "1.0"
        //For Flurry
        multiDexEnabled = true
    }
    //For Flurry
    /*compileOptions {
        //noinspection GroovyAssignabilityCheck
        sourceCompatibility JavaVersion.VERSION_1_7
        //noinspection GroovyAssignabilityCheck
        targetCompatibility JavaVersion.VERSION_1_7
    }*/
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])

    compile 'com.android.support:support-v4:23.1.1'
    compile 'com.android.support:appcompat-v7:23.1.1'

    compile 'com.facebook.android:facebook-android-sdk:4.7.0'
    compile 'com.mcxiaoke.volley:library:1.0.19'
    compile 'joda-time:joda-time:2.8.2'
    compile 'com.github.orangegangsters:swipy:1.2.0@aar'

    compile 'com.squareup.picasso:picasso:2.5.2'
    compile 'com.squareup.okhttp:okhttp:2.6.0'
    compile 'com.squareup.okhttp:okhttp-urlconnection:2.6.0'

    /*compile 'com.android.support:multidex:1.0.1'
    compile 'com.google.android.gms:play-services-ads:8.3.0'
    compile 'com.google.android.gms:play-services-identity:8.3.0'
    compile 'com.google.android.gms:play-services-gcm:8.3.0'*/
}

And could you tell me where can i see results of executed methods in Gradle Console?

What path i need to use and where in build.gradle file situate this method?

Hope you will help me.

Can you try this configuration:

gradle.projectsEvaluated {
     preBuild.dependsOn(copyFiles)
}

update: there are many commands the copy task can do for you. from the docs here are examples:

task anotherCopyTask(type: Copy) {
    // Copy everything under src/main/webapp
    from 'src/main/webapp'
    // Copy a single file
    from 'src/staging/index.html'
    // Copy the output of a task
    from copyTask
    // Copy the output of a task using Task outputs explicitly.
    from copyTaskWithPatterns.outputs
    // Copy the contents of a Zip file
    from zipTree('src/main/assets.zip')
    // Determine the destination directory later
    into { getDestDir() }
}

if you just want to copy from one source directory to another you can do this :

task copyFiles(type: Copy) {
    from 'pathToMyAssets'
    into 'AndroidStudioAssetsFolderPath'
}

UPDATE do this in your app's build.gradle at the very bottom:

task copyFiles(type: Copy) {
    from 'Users/kostya/repo_amc_mobile_promo/Common/'
    into 'Users/kostya/repo_amc_mobile_promo/Android/AMC_Mobile_Promo2/app/src/main/assets'
}

preBuild.dependsOn(copyFiles)