A modern, robust Android utility library — works from both Kotlin and Java.
Zero memory leaks. All utils are stateless or use WeakReference / applicationContext where needed.
Kotlin DSL (settings.gradle.kts):
dependencyResolutionManagement {
repositories {
google()
mavenCentral()
maven { url = uri("https://jitpack.io") }
}
}Groovy DSL (settings.gradle):
dependencyResolutionManagement {
repositories {
google()
mavenCentral()
maven { url 'https://jitpack.io' }
}
}Kotlin DSL:
implementation("com.github.xihadulislam:AndroidUtils:v3.1.1")Groovy DSL:
implementation 'com.github.xihadulislam:AndroidUtils:v3.1.1'| Utility | Description |
|---|---|
SharedPreferences |
Thread-safe key-value storage |
Encryption |
AES-128, MD5, SHA-1/256/512, Base64 |
Validation |
Email, phone, URL, password strength, credit card, IP |
Network |
Internet availability checks |
Clipboard |
Copy, paste, clear |
View / Animations |
Fade, scale, shake, visibility, enable/disable |
Bitmap |
Resize, rotate, crop circle, save to gallery |
StatusBar |
Edge-to-edge, immersive mode, icon color |
Notification |
Channel creation, show/progress/cancel |
Storage |
Internal/external space, cache size, clear cache |
Number |
Formatting, Bangla digits, number-to-words |
Time |
Date formatting, relative time, date helpers |
String |
Mask, initials, slug, camelCase, snake_case |
Payment |
Tax calculations, cash suggestions |
Color |
Lighten, darken, hex conversion |
Device |
Device info, emulator detection |
AppInfo |
Version, debug check, Play Store, app settings |
Intent |
Activity navigation, social sharing |
Screenshot |
Capture views, screen protection |
Debounce |
Per-instance debounce, no global state |
SnackBar |
Styled success/error/warning/info bars |
Text |
Spannable helpers, rich text formatting |
Log |
Debug, error, info, long-message logging |
val prefs = AndroidUtils.getSharePrefSetting(context)
prefs.setString("token", "abc123")
val token = prefs.getString("token")
prefs.setBoolean("logged_in", true)
prefs.setInt("count", 5)
prefs.setLong("timestamp", System.currentTimeMillis())
prefs.setDouble("balance", 99.99)
prefs.remove("token")
prefs.clear()// Java
SharePrefSettings prefs = AndroidUtils.getSharePrefSetting(context);
prefs.setString("token", "abc123");
String token = prefs.getString("token", "");AndroidUtils.isValidEmail("user@example.com") // true
AndroidUtils.isValidPhone("+8801712345678") // true
AndroidUtils.isValidUrl("https://example.com") // true
AndroidUtils.isValidCreditCard("4111111111111111") // true
AndroidUtils.isStrongPassword("MyPass@123") // true
val strength = AndroidUtils.getPasswordStrength("abc") // WEAK
with(ValidationUtil) {
"01712345678".isValidBDPhone() // BD number check
"192.168.1.1".isValidIPv4()
"#FF5733".isValidHexColor()
"1234".isValidPin()
ValidationUtil.getCardType("4111111111111111") // VISA
}// Java
AndroidUtils.isValidEmail("user@example.com");
AndroidUtils.isStrongPassword("MyPass@123");AndroidUtils.copyToClipboard(context, "Hello!")
val text = AndroidUtils.pasteFromClipboard(context)
AndroidUtils.clearClipboard(context)
// Full API
with(ClipboardUtil) {
context.copyText("text", label = "my label")
context.hasText()
}// Java
AndroidUtils.copyToClipboard(context, "Hello!");
String text = AndroidUtils.pasteFromClipboard(context);val encrypted = AndroidUtils.encrypt("hello world")
val decrypted = AndroidUtils.decrypt(encrypted)
with(EncryptionUtil) {
// Custom key & IV (both exactly 16 chars)
val enc = "secret".encrypt(key = "myCustomKey12345", iv = "myCustomIV123456")
val dec = enc?.decrypt(key = "myCustomKey12345", iv = "myCustomIV123456")
val md5 = "password".md5
val sha256 = "password".sha256
val sha512 = "password".sha512
val b64 = "hello".toBase64()
val raw = b64.fromBase64()
val key = EncryptionUtil.generateAesKey() // secure random 16-char key
}AndroidUtils.isInternetAvailable(context)
with(AppUtil) {
context.isOnline()
context.isOnline(
failBlock = { showNoInternet() },
successBlock = { fetchData() }
)
}with(ViewUtil) {
view.visible(); view.gone(); view.invisible()
view.toggleVisibility()
view visibleIf isLoggedIn
view goneIf isLoading
button.enable(); button.disable()
view.resize(200, 100)
view.setMargins(left = 16, top = 8, right = 16, bottom = 8)
view.fadeIn()
view.fadeOut()
view.scaleIn(duration = 300L)
view.scaleOut()
view.shake()
}with(BitmapUtil) {
bitmap.resize(300, 300)
bitmap.scaleToFit(512)
bitmap.rotate(90f)
bitmap.flip(horizontal = true)
bitmap.toCircle()
bitmap.toRoundedCorners(24f)
bitmap.toJpegByteArray(quality = 80)
bitmap.saveToGallery(context, "photo_name") // returns Uri?
bitmap.saveToCache(context) // returns File
view.toBitmap()
}with(StatusBarUtil) {
activity.setStatusBarColor(Color.WHITE)
activity.setStatusBarIconsDark(true) // dark icons for light bg
activity.makeStatusBarTransparent()
activity.enableEdgeToEdge()
activity.enterImmersiveMode()
activity.exitImmersiveMode()
activity.hideStatusBar()
activity.showStatusBar()
activity.keepScreenOn()
activity.setNavigationBarColor(Color.BLACK)
val height = activity.getStatusBarHeight()
}// Create channel once (e.g. in Application.onCreate)
AndroidUtils.createNotificationChannel(context, "main_channel", "General")
// Show notification
AndroidUtils.showNotification(context, 1, "main_channel", "Title", "Body", R.drawable.ic_notif)
// Cancel
AndroidUtils.cancelNotification(context, 1)
// Full API
with(NotificationUtil) {
NotificationUtil.showProgress(context, 2, "main_channel", "Uploading", "45%", R.drawable.ic_upload, max = 100, progress = 45)
NotificationUtil.cancelAll(context)
NotificationUtil.areNotificationsEnabled(context)
}val free = AndroidUtils.getFreeInternalStorage()
val cache = AndroidUtils.getCacheSize(context)
AndroidUtils.clearCache(context)
AndroidUtils.formatStorageSize(free) // "1.2 GB"
with(StorageUtil) {
StorageUtil.getTotalInternalStorage()
StorageUtil.getUsedInternalStorage()
StorageUtil.isExternalStorageAvailable()
StorageUtil.getFreeExternalStorage()
}AndroidUtils.maskEmail("xihad@gmail.com") // "xi*****@gmail.com"
AndroidUtils.maskPhone("01712345678") // "*******5678"
AndroidUtils.toInitials("Xihad Islam") // "XI"
AndroidUtils.capitalizeWords("hello world") // "Hello World"
AndroidUtils.toSlug("Hello World! 2024") // "hello-world-2024"
with(StringUtil) {
"helloWorld".toSnakeCase() // "hello_world"
"hello_world".toCamelCase() // "helloWorld"
"4111111111111111".maskCreditCard() // "**** **** **** 1111"
"racecar".isPalindrome() // true
" Hello World ".removeWhitespace()
"abc123def".digitsOnly() // "123"
"abc123def".lettersOnly() // "abcdef"
"Hello World".wordCount() // 2
"Long text here".truncate(8) // "Long tex…"
null.orDefault("fallback") // "fallback"
}AndroidUtils.numberToWords(1500) // "One Thousand Five Hundred"
AndroidUtils.numberInBangla("12-10-2024") // "১২-১০-২০২৪"
AndroidUtils.getDigitBanglaFromEnglish("1234") // "১২৩৪"
AndroidUtils.getDigitEnglishFromBangla("১২৩৪") // "1234"
with(NumberUtils) {
1.appendOrdinal() // "1st"
11.appendOrdinal() // "11th"
1234567.formatWithCommas() // "1,234,567"
1048576L.formatBytes() // "1.0 MB"
3.14159f.roundOff() // "3.14"
3.14159.roundOff(digits = 4) // "3.1416"
}with(TimeUtils) {
val now = TimeUtils.getCurrentTime()
Date().format("dd MMM yyyy") // "07 Apr 2026"
System.currentTimeMillis().toFormattedDate() // "2026-04-07"
pastTimestamp.toRelativeTime() // "2 hours ago"
futureTimestamp.toRelativeTime() // "in 3 days"
TimeUtils.daysBetween(fromDate, toDate)
date.isToday(); date.isPast(); date.isFuture()
TimeUtils.milliSecondToHMS(90000L) // "00:01:30"
TimeUtils.getToday() // "2026-04-07"
}AndroidUtils.getIncludingTax(100.0, 20.0) // VAT included in price
AndroidUtils.getExcludingTax(100.0, 20.0) // VAT on top of price
AndroidUtils.twoDigitDouble(14.4444) // 14.44
AndroidUtils.twoDigitString(14.364) // "14.36"
AndroidUtils.stringToNumber("13.5") // 13.5
with(PaymentUtils) {
PaymentUtils.getCashOption(87.50) // [87.50, 88.00, 90.00, 100.00, Custom]
99.99.toPriceAmount() // "99.99"
1234567.89.toPriceAmount() // "1,234,567.89"
}with(ColorUtil) {
ColorUtil.setStatusBarColor(activity, R.color.primary)
ColorUtil.getRandomColor()
"#FF5733".hexToRGB() // Triple(255, 87, 51)
Color.RED.colorToHexString() // "#FF0000"
Color.BLUE.lighten(0.3f)
Color.RED.darken(0.2f)
Color.BLACK.isDark() // true
imageView.setTint(Color.GREEN)
textView.setDrawableColor(R.color.icon_tint)
}DeviceInfoUtil.getDeviceName() // "Samsung Galaxy S24"
DeviceInfoUtil.getDeviceId(activity) // Android ID
DeviceInfoUtil.getPrimaryAbi() // "arm64-v8a"
DeviceInfoUtil.getSupportedAbis()
DeviceInfoUtil.isEmulator()
DeviceInfoUtil.getDeviceSuperInfo() // full debug stringAndroidUtils.getVersionName(context) // "3.1.1"
AndroidUtils.getVersionCode(context) // 311
AndroidUtils.isDebugBuild(context) // true/false
AndroidUtils.isAppInstalled(context, "com.whatsapp")
AndroidUtils.openPlayStore(context)
AndroidUtils.openAppSettings(context)
with(AppInfoUtil) {
AppInfoUtil.launchApp(context, "com.instagram.android")
AppInfoUtil.isInstalledFromPlayStore(context)
AppInfoUtil.getInstallerPackage(context)
}// Each screen/component holds its own instance
private val debounce = DebounceUtils()
searchView.addTextChangedListener {
debounce.run(400) { doSearch(it) }
}
// Fixed delays
debounce.run300 { doSomething() }
debounce.run500 { doSomethingElse() }
// Cancel
debounce.cancel()// Java
private final DebounceUtils debounce = AndroidUtils.newDebounce();
searchView.addTextChangedListener(text -> {
debounce.run(400, () -> doSearch(text));
});val bitmap = AndroidUtils.takeScreenshotOfView(rootView)
AndroidUtils.protectToScreenshot(activity)AndroidUtils.applyClickEffect(view)
with(AppUtil) {
button.onClick(debounceDuration = 500L) {
// fires once per 500ms
}
}val snack = AndroidUtils.getSnackBar(activity)
snack.snackBar("Default message")
snack.successSnack(rootView, "Saved!")
snack.errorSnack(rootView, "Something went wrong")
snack.warningSnack(rootView, "Check your connection")
snack.infoSnack(rootView, "Tap to learn more") { /* on click */ }val intent = AndroidUtils.getIntent()
intent.startNextActivity(activity, SecondActivity::class.java)
intent.startNextActivity(activity, SecondActivity::class.java, isFinish = true)
intent.afterNextActivity(activity, milliSecond = 2000, SecondActivity::class.java)
intent.startShareIntent(activity, "Check this out!")
intent.startFeedbackActivity(activity, "support@example.com")
intent.startRateAppActivity(activity)
intent.startWhatsAppIntent(activity, "Hello!")
intent.startFacebookIntent(activity, "https://...")
intent.startTwitterIntent(activity, "https://...")val uid = AndroidUtils.uId() // e.g. "42N35260Y390345AM"All methods are annotated with @JvmStatic and use Runnable instead of lambdas where needed:
// Init
AndroidUtils.init();
// Basic usage
AndroidUtils.toast(context, "Hello");
AndroidUtils.isInternetAvailable(context);
AndroidUtils.copyToClipboard(context, "text");
AndroidUtils.isValidEmail("user@example.com");
AndroidUtils.getVersionName(context);
// SharedPreferences
SharePrefSettings prefs = AndroidUtils.getSharePrefSetting(context);
prefs.setString("key", "value");
// Debounce — each caller holds its own instance
private final DebounceUtils debounce = AndroidUtils.newDebounce();
debounce.run(300, () -> doSearch());
// Post delayed
AndroidUtils.postDelayed(2000, () -> doSomething());| Pattern | How handled |
|---|---|
| Activity in SnackBar | WeakReference<Activity> + isFinishing/isDestroyed guard |
| Activity in delayed navigation | WeakReference<Activity> in afterNextActivity |
| MediaPlayer Context | Always uses context.applicationContext |
| Debounce callbacks | Per-instance DebounceUtils — no global state |
| Click effects | WeakReference<View> in ClickEffect |
| SharedPreferences singleton | Uses applicationContext only |
| All other utils | Stateless object — no stored references |
Clone this repo and check out the app module.
xihad islam
Copyright 2024 xihad islam
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.