build.gradle

apply plugin: 'com.android.application'
 
android {
    compileSdkVersion 23
    buildToolsVersion "23.0.2"
 
    defaultConfig {
        applicationId "net.mnafian.buildflavorsample"
        minSdkVersion 16
        targetSdkVersion 23
        versionCode 1
        versionName "1.0"
        buildConfigField("String", "URI", "\"http://isfaa.me\"")
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}
 
dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    testCompile 'junit:junit:4.12'
    compile 'com.android.support:appcompat-v7:23.2.0'
    compile 'com.android.support:design:23.2.0'
}

test.java

static String BASE_URL = BuildConfig.URI;
Log.d(this.getClassName(), BASE_URL);