AutoFillSmsOTP in Kotlin with Custom Editables for Android

	package com.db.smsotpautofillkotlin.editable
	import android.annotation.SuppressLint
	import android.content.Context
	import android.graphics.Canvas
	import android.graphics.Paint
	import android.graphics.Rect
	import android.graphics.Typeface
	import android.support.annotation.ColorInt
	import android.support.v4.content.ContextCompat
	import android.text.*
	import android.util.AttributeSet
	import android.view.View
	import android.view.inputmethod.EditorInfo
	import android.view.inputmethod.InputConnection
	import android.view.inputmethod.InputMethodManager
	import com.db.smsotpautofillkotlin.R
	import com.db.smsotpautofillkotlin.interfaces.EditCodeListener
	import android.text.Editable
	import com.db.smsotpautofillkotlin.interfaces.EditCodeWatcher
	/**
	* Created by DB on 04-01-2018.
	*/
	class EditCodeView: View, View.OnClickListener, View.OnFocusChangeListener {
	private val textWatcher = CodeTextWatcher()
	private var inputmethodmanager: InputMethodManager? = null
	private var editCodeInputConnection: EditCodeInputConnection? = null
	private var editCodeListener: EditCodeListener? = null
	private var editCodeWatcher: EditCodeWatcher? = null
	private var editable: Editable? = null
	private var textPaint: Paint? = null
	private var underlinePaint: Paint? = null
	private var cursorPaint: Paint? = null
	private var textSize: Float = 0.toFloat()
	private var textPosY: Float = 0.toFloat()
	private var textColor: Int = 0
	private var sectionWidth: Float = 0.toFloat()
	private var codeLength: Int = 0
	private var symbolWidth: Float = 0.toFloat()
	private var symbolMaskedWidth: Float = 0.toFloat()
	private var underlineHorizontalPadding: Float = 0.toFloat()
	private var underlineReductionScale: Float = 0.toFloat()
	private var underlineStrokeWidth: Float = 0.toFloat()
	private var underlineBaseColor: Int = 0
	private var underlineSelectedColor: Int = 0
	private var underlineFilledColor: Int = 0
	private var underlineCursorColor: Int = 0
	private var underlinePosY: Float = 0.toFloat()
	private var fontStyle: Int = 0
	private var cursorEnabled: Boolean = false
	private var codeHiddenMode: Boolean = false
	private var _isSelected: Boolean = false
	private var codeHiddenMask: String? = null
	private val textBounds = Rect()
	constructor(context: Context): this(context, null){
	}
	constructor(context: Context, attrs: AttributeSet?): this(context, attrs, 0){
	}
	constructor(context: Context, attrs: AttributeSet?, defStyleAttr: Int): super(context, attrs, defStyleAttr){
	init(context, attrs)
	}
	private val cursorAnimation = object : Runnable {
	override fun run() {
	val color = if (cursorPaint!!.getColor() === underlineSelectedColor)
	underlineCursorColor
	else
	underlineSelectedColor
	cursorPaint!!.setColor(color)
	invalidate()
	postDelayed(this, 500)
	}
	}
	private fun init(context: Context, attrs: AttributeSet?) {
	initDefaultAttrs(context)
	initCustomAttrs(context, attrs)
	initPaints()
	initViewsOptions(context)
	if (isInEditMode) {
	editModePreview()
	}
	}
	private fun initDefaultAttrs(context: Context) {
	val resources = context.resources
	underlineReductionScale = DEFAULT_REDUCTION_SCALE!!
	underlineStrokeWidth = resources.getDimension(R.dimen.underline_stroke_width)
	underlineBaseColor = ContextCompat.getColor(context, R.color.underline_base_color)
	underlineFilledColor = ContextCompat.getColor(context, R.color.underline_filled_color)
	underlineCursorColor = ContextCompat.getColor(context, R.color.underline_cursor_color)
	underlineSelectedColor = ContextCompat.getColor(context, R.color.underline_selected_color)
	textSize = resources.getDimension(R.dimen.code_text_size)
	textColor = ContextCompat.getColor(context, R.color.text_main_color)
	codeLength = DEFAULT_CODE_LENGTH!!
	codeHiddenMask = DEFAULT_CODE_MASK
	}
	private fun initCustomAttrs(context: Context, attributeSet: AttributeSet?) {
	if (attributeSet == null) return
	val attributes = context.obtainStyledAttributes(
	attributeSet, R.styleable.EditCodeView)
	underlineStrokeWidth = attributes.getDimension(
	R.styleable.EditCodeView_underlineStroke, underlineStrokeWidth)
	underlineReductionScale = attributes.getFloat(
	R.styleable.EditCodeView_underlineReductionScale, underlineReductionScale)
	underlineBaseColor = attributes.getColor(
	R.styleable.EditCodeView_underlineBaseColor, underlineBaseColor)
	underlineSelectedColor = attributes.getColor(
	R.styleable.EditCodeView_underlineSelectedColor, underlineSelectedColor)
	underlineFilledColor = attributes.getColor(
	R.styleable.EditCodeView_underlineFilledColor, underlineFilledColor)
	underlineCursorColor = attributes.getColor(
	R.styleable.EditCodeView_underlineCursorColor, underlineCursorColor)
	cursorEnabled = attributes.getBoolean(
	R.styleable.EditCodeView_underlineCursorEnabled, cursorEnabled)
	textSize = attributes.getDimension(
	R.styleable.EditCodeView_textSize, textSize)
	textColor = attributes.getColor(
	R.styleable.EditCodeView_textColor, textColor)
	fontStyle = attributes.getInt(
	R.styleable.EditCodeView_fontStyle, fontStyle)
	codeLength = attributes.getInt(
	R.styleable.EditCodeView_codeLength, DEFAULT_CODE_LENGTH!!)
	codeHiddenMode = attributes.getBoolean(
	R.styleable.EditCodeView_codeHiddenMode, codeHiddenMode)
	val mask = attributes.getString(R.styleable.EditCodeView_codeHiddenMask)
	if (mask != null && mask.length > 0) {
	codeHiddenMask = mask.substring(0, 1)
	}
	attributes.recycle()
	}
	private fun editModePreview() {
	for (i in 0 until codeLength) {
	if (codeHiddenMode) {
	editable!!.append(codeHiddenMask)
	} else {
	editable!!.append(DEFAULT_CODE_SYMBOL)
	}
	}
	}
	@SuppressLint("WrongConstant")
	private fun initPaints() {
	textPaint = Paint()
	textPaint!!.setColor(textColor)
	textPaint!!.setTextSize(textSize)
	textPaint!!.setTypeface(Typeface.create(Typeface.DEFAULT, fontStyle))
	textPaint!!.setAntiAlias(true)
	underlinePaint = Paint()
	underlinePaint!!.setColor(underlineBaseColor)
	underlinePaint!!.setStrokeWidth(underlineStrokeWidth)
	cursorPaint = Paint()
	cursorPaint!!.setColor(underlineBaseColor)
	cursorPaint!!.setStrokeWidth(underlineStrokeWidth)
	}
	private fun initViewsOptions(context: Context) {
	setOnClickListener(this)
	isFocusable = true
	isFocusableInTouchMode = true
	onFocusChangeListener = this
	inputmethodmanager = context.getSystemService(Context.INPUT_METHOD_SERVICE) as? InputMethodManager
	editable = Editable.Factory.getInstance().newEditable("")
	editable!!.setSpan(textWatcher, 0, editable!!.length, Spanned.SPAN_INCLUSIVE_INCLUSIVE)
	Selection.setSelection(editable, 0)
	editCodeInputConnection = EditCodeInputConnection(this, true, codeLength)
	}
	override fun onSizeChanged(w: Int, h: Int, oldw: Int, oldh: Int) {
	super.onSizeChanged(w, h, oldw, oldh)
	measureSizes(w, h)
	}
	override fun onMeasure(widthMeasureSpec: Int, heightMeasureSpec: Int) {
	setMeasuredDimension(measureWidth(widthMeasureSpec), measureHeight(heightMeasureSpec))
	}
	override fun onDraw(canvas: Canvas) {
	drawUnderline(canvas)
	drawText(canvas)
	}
	override fun onFocusChange(v: View, hasFocus: Boolean) {
	_isSelected = hasFocus
	if (hasFocus) {
	if (cursorEnabled) {
	post(cursorAnimation)
	}
	showKeyboard()
	} else {
	if (cursorEnabled) {
	removeCallbacks(cursorAnimation)
	}
	hideKeyboard()
	}
	}
	private fun drawText(canvas: Canvas) {
	if (codeHiddenMode) {
	val symbol = charArrayOf(codeHiddenMask!!.get(0))
	for (i in 0 until editable!!.length) {
	val textPosX = sectionWidth * i + sectionWidth / 2 - symbolMaskedWidth / 2
	canvas.drawText(symbol, 0, 1, textPosX, textPosY, textPaint)
	}
	} else {
	for (i in 0 until editable!!.length) {
	val symbol = charArrayOf(editable!!.get(i))
	val textPosX = sectionWidth * i + sectionWidth / 2 - symbolWidth / 2
	canvas.drawText(symbol, 0, 1, textPosX, textPosY, textPaint)
	}
	}
	}
	private fun drawUnderline(canvas: Canvas) {
	for (i in 0 until codeLength) {
	val startPosX = sectionWidth * i + underlineHorizontalPadding
	val endPosX = startPosX + sectionWidth - underlineHorizontalPadding * 2
	if (cursorEnabled && _isSelected && editable!!.length == i) {
	canvas.drawLine(startPosX, underlinePosY, endPosX, underlinePosY, cursorPaint)
	} else {
	if (editable!!.length <= i && _isSelected) {
	underlinePaint!!.setColor(underlineSelectedColor)
	} else if (editable!!.length <= i && !_isSelected) {
	underlinePaint!!.setColor(underlineBaseColor)
	} else {
	underlinePaint!!.setColor(underlineFilledColor)
	}
	canvas.drawLine(startPosX, underlinePosY, endPosX, underlinePosY, underlinePaint)
	}
	}
	}
	private fun measureSizes(viewWidth: Int, viewHeight: Int) {
	if (underlineReductionScale > 1) underlineReductionScale = 1f
	if (underlineReductionScale < 0) underlineReductionScale = 0f
	if (codeLength <= 0) {
	throw IllegalArgumentException("Code length must be over than zero")
	}
	symbolWidth = textPaint!!.measureText(DEFAULT_CODE_SYMBOL)
	symbolMaskedWidth = textPaint!!.measureText(codeHiddenMask)
	textPaint!!.getTextBounds(DEFAULT_CODE_SYMBOL, 0, 1, textBounds)
	sectionWidth = (viewWidth / codeLength).toFloat()
	underlinePosY = (viewHeight - paddingBottom).toFloat()
	underlineHorizontalPadding = sectionWidth * underlineReductionScale / 2
	textPosY = (viewHeight / 2 + textBounds.height() / 2).toFloat()
	}
	private fun measureHeight(measureSpec: Int): Int {
	val size = (paddingBottom.toFloat()
	+ paddingTop.toFloat()
	+ textBounds.height().toFloat()
	+ textSize
	+ underlineStrokeWidth).toInt()
	return View.resolveSizeAndState(size, measureSpec, 0)
	}
	private fun measureWidth(measureSpec: Int): Int {
	val size = ((paddingLeft.toFloat() + paddingRight.toFloat() + textSize) * codeLength.toFloat() * 2f).toInt()
	return View.resolveSizeAndState(size, measureSpec, 0)
	}
	fun setEditCodeListener(EditCodeListener: EditCodeListener) {
	this.editCodeListener = EditCodeListener
	}
	fun setCode(code: String) {
	var code = code
	code = code.replace(DEFAULT_REGEX.toRegex(), "")
	editCodeInputConnection!!.setComposingText(code, 1)
	editCodeInputConnection!!.finishComposingText()
	}
	fun clearCode() {
	editCodeInputConnection!!.setComposingRegion(0, codeLength)
	editCodeInputConnection!!.setComposingText("", 0)
	editCodeInputConnection!!.finishComposingText()
	}
	fun getCode(): String {
	return editable.toString()
	}
	fun setReductionScale(scale: Float) {
	var scale = scale
	if (scale > 1) scale = 1f
	if (scale < 0) scale = 0f
	underlineReductionScale = scale
	invalidate()
	}
	fun setCodeHiddenMode(hiddenMode: Boolean) {
	codeHiddenMode = hiddenMode
	invalidate()
	}
	fun setUnderlineBaseColor(@ColorInt colorId: Int) {
	underlineBaseColor = colorId
	invalidate()
	}
	fun setUnderlineFilledColor(@ColorInt colorId: Int) {
	underlineFilledColor = colorId
	invalidate()
	}
	fun setUnderlineSelectedColor(@ColorInt colorId: Int) {
	underlineSelectedColor = colorId
	invalidate()
	}
	fun setUnderlineCursorColor(@ColorInt colorId: Int) {
	underlineCursorColor = colorId
	invalidate()
	}
	fun setTextColor(@ColorInt colorId: Int) {
	textColor = colorId
	invalidate()
	}
	fun setUnderlineStrokeWidth(underlineStrokeWidth: Float) {
	this.underlineStrokeWidth = underlineStrokeWidth
	invalidate()
	}
	fun setCodeLength(length: Int) {
	codeLength = length
	editCodeInputConnection = EditCodeInputConnection(this, true, codeLength)
	editable!!.clear()
	inputmethodmanager!!.restartInput(this)
	invalidate()
	}
	fun setEditCodeWatcher(editCodeWatcher: EditCodeWatcher) {
	this.editCodeWatcher = editCodeWatcher
	}
	fun getCodeLength(): Int {
	return codeLength
	}
	fun showKeyboard() {
	inputmethodmanager!!.showSoftInput(this, 0)
	}
	fun hideKeyboard() {
	inputmethodmanager!!.hideSoftInputFromWindow(
	windowToken,
	InputMethodManager.RESULT_UNCHANGED_SHOWN)
	}
	override fun onClick(v: View) {
	showKeyboard()
	}
	override fun onCreateInputConnection(outAttrs: EditorInfo): InputConnection {
	outAttrs.inputType = InputType.TYPE_CLASS_NUMBER
	outAttrs.imeOptions = EditorInfo.IME_ACTION_DONE
	outAttrs.initialSelStart = 0
	return this.editCodeInputConnection!!
	}
	override fun setSelected(selected: Boolean) {
	_isSelected = selected
	invalidate()
	}
	fun getEditable(): Editable {
	return editable!!
	}
	override fun onCheckIsTextEditor(): Boolean {
	return true
	}
	private inner class CodeTextWatcher : TextWatcher {
	override fun beforeTextChanged(s: CharSequence, start: Int, count: Int, after: Int) {}
	override fun onTextChanged(s: CharSequence, start: Int, before: Int, count: Int) {
	}
	override fun afterTextChanged(s: Editable) {
	invalidate()
	if (editCodeWatcher != null) {
	editCodeWatcher!!.onCodeChanged(s.toString())
	}
	if (editable!!.length == codeLength) {
	if (editCodeListener != null) {
	editCodeListener!!.onCodeReady(editable.toString())
	}
	}
	}
	}
	companion object {
	private val DEFAULT_CODE_LENGTH: Int? = 4
	private val DEFAULT_CODE_MASK = "*"
	private val DEFAULT_CODE_SYMBOL = "0"
	private val DEFAULT_REGEX = "[^0-9]"
	private val DEFAULT_REDUCTION_SCALE: Float? = 0.5f
	}
	}

view raw EditCodeView.kt hosted with ❤ by GitHub

	package com.db.smsotpautofillkotlin.editable
	import android.view.View
	import android.view.inputmethod.BaseInputConnection
	import android.text.Editable
	import android.view.KeyEvent
	/**
	* Created by DB on 03-01-2018.
	*/
	class EditCodeInputConnection(targetView: View, fullEditor: Boolean, textLength: Int): BaseInputConnection(targetView, fullEditor) {
	private var _editable: Editable? = null
	private var textLength: Int = 0
	init {
	val view = targetView as EditCodeView
	this.textLength = textLength
	this._editable = view.getEditable()
	}
	override fun getEditable(): Editable {
	return this._editable!!
	}
	override fun sendKeyEvent(event: KeyEvent): Boolean {
	if (event.getAction() === KeyEvent.ACTION_DOWN) {
	if (event.getKeyCode() >= KeyEvent.KEYCODE_0 && event.getKeyCode() <= KeyEvent.KEYCODE_9) {
	val c = event.getKeyCharacterMap().getNumber(event.getKeyCode())
	commitText(c.toString(), 1)
	} else if (event.getKeyCode() === KeyEvent.KEYCODE_DEL) {
	deleteSurroundingText(1, 0)
	}
	}
	return super.sendKeyEvent(event)
	}
	override fun commitText(text: CharSequence, newCursorPosition: Int): Boolean {
	return _editable!!.length + text.length <= textLength && super.commitText(text.subSequence(0, 1), newCursorPosition)
	}
	override fun setComposingText(text: CharSequence, newCursorPosition: Int): Boolean {
	var text = text
	if (text.length > textLength) {
	text = text.subSequence(0, textLength)
	}
	return super.setComposingText(text, newCursorPosition)
	}
	override fun setComposingRegion(start: Int, end: Int): Boolean {
	return super.setComposingRegion(start, end)
	}
	override fun finishComposingText(): Boolean {
	return super.finishComposingText()
	}
	}

view raw EditCodeInputConnection.kt hosted with ❤ by GitHub

	package com.db.smsotpautofillkotlin.receivers
	import android.content.BroadcastReceiver
	import android.content.Context
	import android.content.Intent
	import android.support.v4.app.NotificationCompat.getExtras
	import android.os.Bundle
	import android.R.attr.data
	import android.telephony.SmsMessage
	import java.util.regex.Pattern
	import com.db.smsotpautofillkotlin.interfaces.SmsListener
	/**
	* Created by DB on 03-01-2018.
	*/
	class SmsReceiver: BroadcastReceiver() {
	@Suppress("DEPRECATION")
	override fun onReceive(context: Context?, intent: Intent?) {
	val data = intent!!.getExtras()
	val pdus = data.get("pdus") as Array<Any>
	for (i in 0 until pdus.size) {
	val smsMessage = SmsMessage.createFromPdu(pdus[i] as ByteArray)
	val sender = smsMessage.getDisplayOriginatingAddress()
	//Check the sender to filter messages which we require to read
	val pattern = Pattern.compile(OTP_SENDER_REGEX)
	val matcher = pattern.matcher(sender)
	while (matcher.find()) {
	val messageBody: String? = smsMessage.getMessageBody()
	//Pass the message text to interface
	if (messageBody != null) {
	mListener!!.messageReceived(messageBody)
	}
	}
	}
	}
	companion object {
	val OTP_SENDER_REGEX: String? = "[0-9a-zA-Z]"
	//interface
	private var mListener: SmsListener? = null
	fun bindListener(listener: SmsListener) {
	mListener = listener
	}
	}
	}

view raw SmsReceiver.kt hosted with ❤ by GitHub

	package com.db.smsotpautofillkotlin
	import android.support.v7.app.AppCompatActivity
	import android.os.Bundle
	import android.util.Log
	import com.db.smsotpautofillkotlin.interfaces.EditCodeWatcher
	import com.db.smsotpautofillkotlin.interfaces.EditCodeListener
	import android.view.WindowManager
	import com.db.smsotpautofillkotlin.editable.EditCodeView
	import com.db.smsotpautofillkotlin.interfaces.SmsListener
	import com.db.smsotpautofillkotlin.receivers.SmsReceiver
	import java.util.regex.Pattern
	class DBSmsOTPActivity : AppCompatActivity() {
	override fun onCreate(savedInstanceState: Bundle?) {
	super.onCreate(savedInstanceState)
	setContentView(R.layout.activity_dbsms_otp)
	window.setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_VISIBLE)
	val editCodeView = findViewById(R.id.dbotp) as EditCodeView
	editCodeView.setEditCodeListener(object : EditCodeListener {
	override fun onCodeReady(code: String) {
	}
	})
	editCodeView.setEditCodeWatcher(object : EditCodeWatcher {
	override fun onCodeChanged(code: String) {
	Log.e("CodeWatcher", " changed : " + code)
	}
	})
	editCodeView.requestFocus()
	SmsReceiver.Companion.bindListener(object : SmsListener {
	override fun messageReceived(messageText: String) {
	//From the received text string you may do string operations to get the required OTP
	//It depends on your SMS format
	Log.e("Message", messageText)
	// Toast.makeText(DbSmsOTPActivity.this,"Message: " + messageText, Toast.LENGTH_LONG).show();
	// If your OTP is six digits number, you may use the below code
	val pattern = Pattern.compile(OTP_REGEX)
	val matcher = pattern.matcher(messageText)
	var otp: String? = null
	while (matcher.find()) {
	otp = matcher.group()
	}
	// Toast.makeText(DbSmsOTPActivity.this, "OTP: " + otp , Toast.LENGTH_LONG).show();
	assert(otp != null)
	editCodeView.setCode(otp!!)
	}
	})
	}
	companion object {
	val OTP_REGEX: String? = "[0-9]{1,6}"
	}
	}

view raw DBSmsOTPActivity.kt hosted with ❤ by GitHub

	package com.db.smsotpautofillkotlin.interfaces
	/**
	* Created by DB on 03-01-2018.
	*/
	interface EditCodeListener {
	fun onCodeReady(code: String)
	}

view raw EditCodeListener.kt hosted with ❤ by GitHub

	package com.db.smsotpautofillkotlin.interfaces
	/**
	* Created by DB on 03-01-2018.
	*/
	interface EditCodeWatcher {
	fun onCodeChanged(code: String)
	}

view raw EditCodeWatcher.kt hosted with ❤ by GitHub

	package com.db.smsotpautofillkotlin.interfaces
	/**
	* Created by DB on 03-01-2018.
	*/
	interface SmsListener {
	fun messageReceived(messageText: String)
	}

view raw SmsListener.kt hosted with ❤ by GitHub

Github Source: Download Source