FrancescoJo

/**
 * This logic demonstrates how to draw all nCr combinations from given set.
 * The time complexity of this logic is O(n²).
 * Actual logic invocations are 1/2((n - 2)² + r(n - 2) + 2), where n > 2.
 *
 * Imagine selecting 3 different numbers from a set which has 4 different 
 * numbers. Assume that we've given a set as follows:
 * 
 * let dataSet = {1, 2, 3, 4}
 * 

FrancescoJo

class EvenOddPickGame(private val randomIntGen : RandomValueGenerator<Integer>) {
    fun pick(times: Int): List<String> {
        return ArrayList<String>().apply {
            for (i in 0 until times) {
                val rolled = randomIntGen.nextRandom(lowerBound = 1, upperBound = 2) % 2
                if (rolled == 0) {
                    add("EVEN")
                } else {
                    add("ODD")
                }

FrancescoJo

import android.annotation.TargetApi
import android.os.Build
import android.security.keystore.KeyGenParameterSpec
import android.security.keystore.KeyProperties
import android.util.Base64
import timber.log.Timber
import java.security.GeneralSecurityException
import java.security.KeyStore
import javax.crypto.Cipher
import javax.crypto.KeyGenerator

FrancescoJo

import android.content.SharedPreferences

/**
 * A [android.content.SharedPreferences] wrapper that helps easy reading/writing values.
 *
 * @author Francesco Jo(nimbusob@gmail.com)
 * @since 22 - Mar - 2018
 */
class SecureSharedPreferences(private val sharedPref: SharedPreferences) {
    fun contains(key: String) = sharedPref.contains(key)

FrancescoJo

import android.os.Build
import android.security.KeyPairGeneratorSpec
import android.security.keystore.KeyGenParameterSpec
import android.security.keystore.KeyProperties
import android.util.Base64
import timber.log.Timber
import java.math.BigInteger
import java.security.GeneralSecurityException
import java.security.KeyPairGenerator
import java.security.KeyStore

FrancescoJo

use -assumenosideeffects

https://www.guardsquare.com/en/proguard/manual/usage
http://qiita.com/gfx/items/e412dab7f127b7ae44d8
https://github.com/gfx/ProguardRemovesObjectWait

FrancescoJo

import java.util.regex.Matcher
import java.util.regex.Pattern

// ext makes method callable project wide
ext.getCurrentFlavor = { ->
    Gradle gradle = getGradle()
    String tskReqStr = gradle.getStartParameter().getTaskRequests().toString()

    Pattern pattern;

FrancescoJo

String path = "android.resource://" + context.getPackageName() + "/" + R.raw.raw_resource_id;
Uri rawUri  = Uri.parse(path);

FrancescoJo

<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE resources [
  <!ENTITY appname "WhereDat">
  <!ENTITY author "Oded">
]>

<resources>
    <string name="app_name">&appname;</string>
    <string name="description">The &appname; app was created by &author;</string>
</resources>