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if(avengers!= null && avenger.haveInfinityStones()) {
destroyThanos(avengers);
}

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var timeStone: String = "Dr Strange"
timeStone = null
//Here thanos(null value) will destroy our timeStone then we can't use gaunet (compilation error)

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var timeStone: String? = "Dr Strange"
timeStone = null

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if(avengers?.haveInfinityStones()){
 destroyThanos(avengers)
}
Or
if(avengers!!.haveInfinityStones()){
 destroyThanos(avengers)
}

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val result = nullableVariable?.someMethodCall() ?: fallbackIfNullMethodCall()

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<com.google.android.exoplayer2.ui.StyledPlayerView
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:id="@+id/player_exo"
 app:use_controller="true" />

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private fun initPlayer() {
    player = SimpleExoPlayer.Builder(this).build()
    player?.playWhenReady = true
    player_exo.player = player
    val defaultHttpDataSourceFactory = DefaultHttpDataSourceFactory("ExoPlayerDemoUserAgent")
    val mediaItem = MediaItem.fromUri("uri")
    val mediaSource =
        HlsMediaSource.Factory(defaultHttpDataSourceFactory).createMediaSource(mediaItem)
    player?.setMediaSource(mediaSource)
    player?.seekTo(playbackPosition)

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    override fun onStart() {
        super.onStart()
        if (Util.SDK_INT >= 24) {
            initPlayer()
        }
    }
    override fun onStop() {
        super.onStop()
        if (Util.SDK_INT >= 24) {
            releasePlayer()

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app:show_buffering="when_playing"
app:use_sensor_rotation="true|false"
app:show_subtitle_button="true|false"
app:show_fastforward_button="true|false"
app:show_rewind_button="true|false"
app:fastforward_increment="15000"//in ms i.e 15s
app:rewind_increment="15000"
app:show_next_button="true|false"
app:show_previous_button="true|false"
app:resize_mode="fill|fit|zoom|fixed_height|fixed_width"

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fun DefaultTrackSelector.generateQualityList(): ArrayList<Pair<String, TrackSelectionOverrides.Builder>> {
    //Render Track -> TRACK GROUPS (Track Array)(Video,Audio,Text)->Track
    val trackOverrideList = ArrayList<Pair<String, TrackSelectionOverrides.Builder>>()

    val renderTrack = this.currentMappedTrackInfo
    val renderCount = renderTrack?.rendererCount ?: 0
    for (rendererIndex in 0 until renderCount) {
        if (isSupportedFormat(renderTrack, rendererIndex)) {
            val trackGroupType = renderTrack?.getRendererType(rendererIndex)
            val trackGroups = renderTrack?.getTrackGroups(rendererIndex)