Gradle Build Config for Creating Signed and Aligned APK

build.gradle

android {

    signingConfigs {
        release {
            keyAlias 'KEY_ALIAS'
            keyPassword 'KEY_PASS'
            storeFile file('PATH_TO_KEY.jks')
            storePassword 'STORE_PASS'
        }
    }
    compileSdkVersion 25
    buildToolsVersion "25.0.3"
    ..
    ..
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
            signingConfig signingConfigs.release
        }
    }
}