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https://github.com/Michatec/Radio.git
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Michatec
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/*
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* SearchResultAdapter.kt
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* Implements the SearchResultAdapter class
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* A SearchResultAdapter is a custom adapter providing search result views for a RecyclerView
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*
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* This file is part of
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* TRANSISTOR - Radio App for Android
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*
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* Copyright (c) 2015-22 - Y20K.org
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* Licensed under the MIT-License
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* http://opensource.org/licenses/MIT
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*/
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package com.michatec.radio.search
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import android.content.Context
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import android.media.AudioAttributes
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import android.media.AudioFocusRequest
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import android.media.AudioManager
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import android.os.Build
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import android.view.LayoutInflater
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import android.view.View
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import android.view.ViewGroup
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import android.widget.Toast
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import androidx.appcompat.app.AppCompatActivity
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import androidx.lifecycle.DefaultLifecycleObserver
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import androidx.lifecycle.LifecycleOwner
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import androidx.media3.common.MediaItem
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import androidx.media3.exoplayer.ExoPlayer
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import androidx.recyclerview.widget.RecyclerView
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import com.google.android.material.textview.MaterialTextView
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import com.michatec.radio.R
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import com.michatec.radio.core.Station
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/*
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* SearchResultAdapter class
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*/
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class SearchResultAdapter(
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private val listener: SearchResultAdapterListener,
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var searchResults: List<Station>) : RecyclerView.Adapter<RecyclerView.ViewHolder>() {
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/* Main class variables */
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private var selectedPosition: Int = RecyclerView.NO_POSITION
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private var exoPlayer: ExoPlayer? = null
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private var paused: Boolean = false
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private var isItemSelected: Boolean = false
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/* Listener Interface */
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interface SearchResultAdapterListener {
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fun onSearchResultTapped(result: Station)
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fun activateAddButton()
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fun deactivateAddButton()
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}
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init {
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setHasStableIds(true)
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}
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/* Overrides onCreateViewHolder from RecyclerView.Adapter */
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override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): RecyclerView.ViewHolder {
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val v = LayoutInflater.from(parent.context)
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.inflate(R.layout.element_search_result, parent, false)
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return SearchResultViewHolder(v)
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}
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/* Overrides getItemCount from RecyclerView.Adapter */
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override fun getItemCount(): Int {
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return searchResults.size
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}
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/* Overrides getItemCount from RecyclerView.Adapter */
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override fun getItemId(position: Int): Long = position.toLong()
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/* Overrides onBindViewHolder from RecyclerView.Adapter */
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override fun onBindViewHolder(holder: RecyclerView.ViewHolder, position: Int) {
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// get reference to ViewHolder
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val searchResultViewHolder: SearchResultViewHolder = holder as SearchResultViewHolder
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val searchResult: Station = searchResults[position]
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// update text
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searchResultViewHolder.nameView.text = searchResult.name
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searchResultViewHolder.streamView.text = searchResult.getStreamUri()
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if (searchResult.codec.isNotEmpty()) {
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if (searchResult.bitrate == 0) {
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// show only the codec when the bitrate is at "0" from radio-browser.info API
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searchResultViewHolder.bitrateView.text = searchResult.codec
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} else {
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// show the bitrate and codec if the result is available in the radio-browser.info API
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searchResultViewHolder.bitrateView.text = buildString {
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append(searchResult.codec)
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append(" | ")
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append(searchResult.bitrate)
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append("kbps")}
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}
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} else {
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// do not show for M3U and PLS playlists as they do not include codec or bitrate
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searchResultViewHolder.bitrateView.visibility = View.GONE
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}
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// mark selected if necessary
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val isSelected = selectedPosition == holder.adapterPosition
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searchResultViewHolder.searchResultLayout.isSelected = isSelected
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// toggle text scrolling (marquee) if necessary
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searchResultViewHolder.nameView.isSelected = isSelected
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searchResultViewHolder.streamView.isSelected = isSelected
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// reduce the shadow left and right because of scrolling (Marquee)
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searchResultViewHolder.nameView.setFadingEdgeLength(10)
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searchResultViewHolder.streamView.setFadingEdgeLength(10)
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// attach touch listener
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searchResultViewHolder.searchResultLayout.setOnClickListener {
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// move marked position
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val previousSelectedPosition = selectedPosition
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selectedPosition = holder.adapterPosition
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notifyItemChanged(previousSelectedPosition)
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notifyItemChanged(selectedPosition)
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// check if the selected position is the same as before
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val samePositionSelected = previousSelectedPosition == selectedPosition
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if (samePositionSelected) {
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// if the same position is selected again, reset the selection
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resetSelection(false)
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} else {
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// get the selected station from searchResults
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val selectedStation = searchResults[holder.adapterPosition]
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// perform pre-playback here
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performPrePlayback(searchResultViewHolder.searchResultLayout.context, selectedStation.getStreamUri())
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// hand over station
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listener.onSearchResultTapped(searchResult)
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}
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// update isItemSelected based on the selection
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isItemSelected = !samePositionSelected
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// enable/disable the Add button based on isItemSelected
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if (isItemSelected) {
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listener.activateAddButton()
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} else {
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listener.deactivateAddButton()
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}
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}
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}
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private fun performPrePlayback(context: Context, streamUri: String) {
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if (streamUri.contains(".m3u8")) {
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// release previous player if it exists
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stopPrePlayback()
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// show toast when no playback is possible
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Toast.makeText(context, R.string.toastmessage_preview_playback_failed, Toast.LENGTH_SHORT).show()
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} else {
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stopRadioPlayback(context)
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// release previous player if it exists
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stopPrePlayback()
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// create a new instance of ExoPlayer
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exoPlayer = ExoPlayer.Builder(context).build()
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// create a MediaItem with the streamUri
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val mediaItem = MediaItem.fromUri(streamUri)
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// set the MediaItem to the ExoPlayer
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exoPlayer?.setMediaItem(mediaItem)
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// prepare and start the ExoPlayer
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exoPlayer?.prepare()
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exoPlayer?.play()
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// show toast when playback is possible
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Toast.makeText(context, R.string.toastmessage_preview_playback_started, Toast.LENGTH_SHORT).show()
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// listen for app pause events
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val lifecycle = (context as AppCompatActivity).lifecycle
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val lifecycleObserver = object : DefaultLifecycleObserver {
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override fun onPause(owner: LifecycleOwner) {
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if (!paused) {
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paused = true
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stopPrePlayback()
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}
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}
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}
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lifecycle.addObserver(lifecycleObserver)
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}
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}
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fun stopPrePlayback() {
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// stop the ExoPlayer and release resources
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exoPlayer?.stop()
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exoPlayer?.release()
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exoPlayer = null
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}
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private fun stopRadioPlayback(context: Context) {
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// stop radio playback when one is active
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val audioManager = context.getSystemService(Context.AUDIO_SERVICE) as AudioManager
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if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
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val audioAttributes = AudioAttributes.Builder()
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.setUsage(AudioAttributes.USAGE_MEDIA)
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.setContentType(AudioAttributes.CONTENT_TYPE_MUSIC)
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.build()
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val focusRequest = AudioFocusRequest.Builder(AudioManager.AUDIOFOCUS_GAIN_TRANSIENT)
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.setAudioAttributes(audioAttributes)
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.build()
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audioManager.requestAudioFocus(focusRequest)
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} else {
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@Suppress("DEPRECATION")
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// For older versions where AudioFocusRequest is not available
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audioManager.requestAudioFocus(null, AudioManager.STREAM_MUSIC, AudioManager.AUDIOFOCUS_GAIN_TRANSIENT)
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}
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}
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/* Resets the selected position */
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fun resetSelection(clearAdapter: Boolean) {
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val currentlySelected: Int = selectedPosition
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selectedPosition = RecyclerView.NO_POSITION
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if (clearAdapter) {
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val previousItemCount = itemCount
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searchResults = emptyList()
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notifyItemRangeRemoved(0, previousItemCount)
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} else {
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notifyItemChanged(currentlySelected)
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stopPrePlayback()
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}
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}
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/*
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* Inner class: ViewHolder for a radio station search result
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*/
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private inner class SearchResultViewHolder(var searchResultLayout: View) :
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RecyclerView.ViewHolder(searchResultLayout) {
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val nameView: MaterialTextView = searchResultLayout.findViewById(R.id.station_name)
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val streamView: MaterialTextView = searchResultLayout.findViewById(R.id.station_url)
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val bitrateView: MaterialTextView = searchResultLayout.findViewById(R.id.station_bitrate)
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}
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}
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