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<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@color/background_lay"
    tools:context=".MainActivity">

    <Button

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<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
     <item>
         <shape>
             <solid android:color="@color/buttonbackground"/>
             <corners android:radius="16dp"/>
         </shape>

     </item>
</selector>

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<?xml version="1.0" encoding="utf-8"?>
<resources>
    <color name="colorPrimary">#6200EE</color>
    <color name="colorPrimaryDark">#3700B3</color>
    <color name="colorAccent">#03DAC5</color>


    <color name="background_lay">#fff</color>
    <color name="buttonbackground">#00008B</color>
    <color name="button_text">#fff</color>

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    <string name="mode">Enable Dark Mode</string>

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<?xml version="1.0" encoding="utf-8"?>
<resources>
    <color name="colorPrimary">#6200EE</color>
    <color name="colorPrimaryDark">#3700B3</color>
    <color name="colorAccent">#03DAC5</color>

    <color name="background_lay">#00008B</color>
    <color name="buttonbackground">#fff</color>
    <color name="button_text">#00008B</color>
</resources>

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 package com.example.constrainttutorial

import android.content.SharedPreferences
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.widget.Button
import androidx.appcompat.app.AppCompatDelegate

 class MainActivity : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {

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<style name="spinnerTheme" parent= "Widget.MaterialComponents.TextInputLayout.FilledBox.ExposedDropdownMenu">
         <item name="strokeColor">@color/grey</item>
</style>

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    <style name="spinnerTheme" parent= "Widget.MaterialComponents.TextInputLayout.FilledBox.ExposedDropdownMenu">
         <item name="strokeColor">@color/grey</item>
        <item name="endIconDrawable">@drawable/vector__spinner_dropdown</item>
    </style>

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/*
 *  Copyright 2017 Google Inc.
 *
 * 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

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var myEditText = findViewById<EditText>(R.id.myEditText)


myEditText.doOnTextChanged { text, start, before, count ->
            run {
               // run your code here. 
              // the text is the changed text
            
            }