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data class Stopwatch(
    val id: Int,
    var currentMs: Long,
    var isStarted: Boolean
)

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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"
    tools:context=".MainActivity">

    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/recycler"

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<?xml version="1.0" encoding="utf-8"?>
<androidx.cardview.widget.CardView 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="wrap_content"
    android:layout_marginStart="16dp"
    android:layout_marginTop="8dp"
    android:layout_marginEnd="16dp"
    android:layout_marginBottom="8dp">

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<?xml version="1.0" encoding="utf-8"?>
<animation-list xmlns:android="http://schemas.android.com/apk/res/android"
    android:oneshot="false">
    <item
        android:drawable="@color/transparent"
        android:duration="700" />
    <item
        android:drawable="@drawable/circle"
        android:duration="700" />
</animation-list>

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class MainActivity : AppCompatActivity() {

    private lateinit var binding: ActivityMainBinding

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)

        binding = ActivityMainBinding.inflate(layoutInflater)
        setContentView(binding.root)
    }

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// (1)
interface List<T> {
  override fun get(index: Int): T
  // ...
}
  
// (2)
val <T> x: T = someInit()

// (3)

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val okHttpClient = OkHttpClient()
okHttpClient.newCall(requestOne).enqueue(object : Callback {
  
  override fun onFailure(call: Call, e: IOException) {
    Log.e(TAG, e)
  }
  
  override fun onResponse(call: Call, response: Response) {
    client.newCall(requestTwo).execute()  
  }

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<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="io.github.ziginsider.mediabuttons">

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"

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package io.github.ziginsider.mediabuttons

import android.content.BroadcastReceiver
import android.content.Context
import android.content.Intent
import android.util.Log
import android.view.KeyEvent


class UiReceiver : BroadcastReceiver() {

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class MainActivity : AppCompatActivity() {

    private var uiIntentFilter: IntentFilter? = null
    private var receiver = UiReceiver()
    private var mReceiverComponent : ComponentName? = null
    private var mAudioManager: AudioManager? = null

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)