build.gradle

apply plugin: 'com.android.application'

import java.text.DateFormat
import java.text.SimpleDateFormat

def getDateTimestamp() {
    DateFormat df = new SimpleDateFormat("YYYY-MM-dd @ HH:mm:ss a");
    return new String(df.format(new Date()).toString());
}

def getShellCommandOutput(String shellCmd) {
    def cmdResult = ['bash', '-c', shellCmd].execute();
    cmdResult.waitFor();
    return cmdResult.text[0..-2];
}

def getGitCommitHash() {
    return getShellCommandOutput("git show | head -n 1 | sed -e \"s/commit //\" | cut -c-12");
}

def getGitCommitDate() {
    return getShellCommandOutput("git show | grep Date: | head -n 1 | sed -e \"s/Date:[ ]*//\"");
}

android {

    compileSdkVersion 28
    buildToolsVersion "28.0.3"

    defaultConfig {

        applicationId "com.maxieds.MCTLibraryDemo"
        minSdkVersion 25
        targetSdkVersion 28
        versionCode 20
        versionName "1.2.0"

        buildConfigField "String", "BUILD_TIMESTAMP", "\"" + getDateTimestamp() + "\""
        buildConfigField "String", "GIT_COMMIT_HASH", "\"" + getGitCommitHash() + "\""
        buildConfigField "String", "GIT_COMMIT_DATE", "\"" + getGitCommitDate() + "\""

    }

    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }

        packagingOptions {
            exclude 'META-INF/DEPENDENCIES'
            exclude 'META-INF/LICENSE'
            exclude 'META-INF/LICENSE.txt'
            exclude 'META-INF/license.txt'
            exclude 'META-INF/NOTICE'
            exclude 'META-INF/NOTICE.txt'
            exclude 'META-INF/notice.txt'
            exclude 'META-INF/ASL2.0'
            exclude 'META-INF/androidx*'
            exclude 'META-INF/android*'
        }
    }

}

repositories {
    jcenter()
    google()
    maven { url 'https://jitpack.io' }
    dependencies {
        classpath 'com.android.tools.build:gradle:4.10.1'
    }
}

dependencies {
    implementation fileTree(include: ['*.jar'], dir: 'libs')
    implementation 'com.android.support:appcompat-v7:28.0.0'
    implementation 'com.github.maxieds:MifareClassicToolLibrary:1.1.9'
    implementation 'com.nononsenseapps:filepicker:4.1.0'
    classpath 'com.android.tools.build:gradle:4.10.1'
}