我正在开发一个运行良好的音频播放器应用程序，但是如果我最小化该应用程序会杀死我的前台服务，那么我将面临一个问题。我不知道为什么会这样，有人可以向我提出任何解决方案吗
MainActivity
import android.Manifest
import android.app.PendingIntent
import android.content.*
import android.graphics.Bitmap
import android.graphics.BitmapFactory
import android.net.Uri
import android.os.Build
import android.os.Bundle
import android.os.Handler
import android.os.IBinder
import android.support.v4.media.MediaDescriptionCompat
import android.support.v4.media.MediaMetadataCompat
import android.support.v4.media.session.MediaSessionCompat
import android.text.Html
import android.util.Log
import android.view.WindowManager
import android.widget.SeekBar
import androidx.appcompat.app.AppCompatActivity
import androidx.core.view.isVisible
import androidx.fragment.app.Fragment
import androidx.fragment.app.FragmentTransaction
import androidx.localbroadcastmanager.content.LocalBroadcastManager
import com.brahmakumaris.fragment.*
import com.brahmakumaris.model.getDashboard.RecentSong
import com.brahmakumaris.service.MusicPlayerService
import com.brahmakumaris.service.MyService
import com.brahmakumaris.util.*
import com.google.android.exoplayer2.DefaultLoadControl
import com.google.android.exoplayer2.ExoPlaybackException
import com.google.android.exoplayer2.Player
import com.google.android.exoplayer2.SimpleExoPlayer
import com.google.android.exoplayer2.ext.mediasession.MediaSessionConnector
import com.google.android.exoplayer2.ext.mediasession.TimelineQueueNavigator
import com.google.android.exoplayer2.extractor.DefaultExtractorsFactory
import com.google.android.exoplayer2.source.ConcatenatingMediaSource
import com.google.android.exoplayer2.source.ProgressiveMediaSource
import com.google.android.exoplayer2.trackselection.DefaultTrackSelector
import com.google.android.exoplayer2.ui.PlayerNotificationManager
import com.google.android.exoplayer2.upstream.DefaultDataSourceFactory
import com.google.android.exoplayer2.util.Util
import kotlinx.android.synthetic.main.activity_main.*
import java.util.*
import kotlin.collections.ArrayList
class MainActivity : AppCompatActivity(), OnFragmentInteractionListener {
override fun onFragmentInteraction(screen: String, model: RecentSong, songList: ArrayList<RecentSong>, position: Int) {
MyLog.e(TAG, screen)
when (screen) {
getString(R.string.speakers) -> {
bottom_navigation.selectedItemId = R.id.nav_speaker
supportFragmentManager.switch(
newFrag = SpeakerPageFragment.newInstance(),
tag = getString(R.string.speakers)
)
}
getString(R.string.classes) -> {
bottom_navigation.selectedItemId = R.id.nav_class
supportFragmentManager.switch(
newFrag = ClassesPageFragment.newInstance(),
tag = getString(R.string.classes)
)
}
getString(R.string.songs) -> {
bottom_navigation.selectedItemId = R.id.nav_song
supportFragmentManager.switch(
newFrag = SongsPageFragment.newInstance(),
tag = getString(R.string.songs)
)
}
getString(R.string.play_song) -> {
if(!model.name.isNullOrBlank()) {
songPosition = position
mSongList = songList
MyLog.e(TAG, "======= ${getString(R.string.play_song)} ${model.name}")
isPlaying = false // to start new song
// play song
if (!lnPlayer.isVisible) {
lnPlayer.isVisible = true
}
titleTxt.setHtmlText(model.name)
if(mBound) {
startService()
mMusicPlayerService.playSong(mSongList,songPosition)
media_button.setImageResource(R.drawable.ic_pause_black_24dp)
}
setPlayPause(!mMusicPlayerService.isPlaying())
initSeekBar()
}
}
else -> {
}
}
}
private val TAG = javaClass.simpleName
private var isPlaying = false
private var mediaSource: ProgressiveMediaSource? = null
// notification
private lateinit var mediaSessionConnector: MediaSessionConnector
private lateinit var mediaSession: MediaSessionCompat
private lateinit var playerNotificationManager: PlayerNotificationManager
private var handler: Handler? = null
private val dashUrl = "http://www.panacherock.com/downloads/mp3/01_All_Tangled_Up.mp3"
var mSongList: ArrayList<RecentSong> = ArrayList()
var songPosition = 0
val MESSAGE_KEY = "message_key"
private lateinit var mMusicPlayerService:MusicPlayerService
private lateinit var mPlayer: SimpleExoPlayer
private var mBound = false
private val mServiceConnection: ServiceConnection = object : ServiceConnection {
override fun onServiceConnected(componentName: ComponentName, iBinder: IBinder) {
val binder = iBinder as MusicPlayerService.MyServiceBinder
mMusicPlayerService = binder.getService()
mPlayer = mMusicPlayerService.getPlayerInstance()!!
mPlayer.addListener(playerListener)
mBound = true
MyLog.e(TAG,"onServiceConnected: ")
}
override fun onServiceDisconnected(componentName: ComponentName) {
mBound = false
MyLog.e(TAG,"onServiceDisconnected: ") // calles only in rare case if service destroy unexpectedly
}
}
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
window.addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON)
if (savedInstanceState == null) {
supportFragmentManager.switch(
newFrag = DashboardPageFragment.newInstance(),
tag = getString(R.string.home)
)
}
getIntentData()
bottom_navigation.setOnNavigationItemSelectedListener { item ->
hideKeybord()
when(item.itemId) {
R.id.nav_home -> {
checkFragment()
supportFragmentManager.switch(
newFrag = DashboardPageFragment.newInstance(),
tag = getString(R.string.home)
)
true
}
R.id.nav_song -> {
checkFragment()
supportFragmentManager.switch(
newFrag = SongsPageFragment.newInstance(),
tag = getString(R.string.songs)
)
true
}
R.id.nav_speaker -> {
checkFragment()
supportFragmentManager.switch(
newFrag = SpeakerPageFragment.newInstance(),
tag = getString(R.string.speakers)
)
true
}
R.id.nav_class -> {
checkFragment()
supportFragmentManager.switch(
newFrag = ClassesPageFragment.newInstance(),
tag = getString(R.string.classes)
)
true
}
R.id.nav_search -> {
checkFragment()
supportFragmentManager.switch(
newFrag = SearchPageFragment.newInstance(),
tag = getString(R.string.search)
)
true
}
else -> false
}
}
bottom_navigation.setOnNavigationItemReselectedListener { } //disable reselection tab
media_button.setOnClickListener {
// startService()
setPlayPause(!isPlaying)
}
imgClose.setOnClickListener {
isPlaying = true // to stop song
playerNotificationManager.setPlayer(null)
setPlayPause(!isPlaying)
if (lnPlayer.isVisible) {
lnPlayer.isVisible = false
}
}
}
private fun getIntentData() {
if (intent!=null && intent.hasExtra("internet") && !intent.getBooleanExtra("internet", false)) {
this.changeFragment(
DownloadPageFragment.newInstance(), Constants.DOWNLOAD_TAG
)
}
}
private fun checkFragment() {
val fragment = getSupportFragmentManager().findFragmentByTag(Constants.SUB_CATEGORY_TAG)
if (fragment != null) {
getSupportFragmentManager().beginTransaction().remove(fragment).commit()
}
val fragment2 = getSupportFragmentManager().findFragmentByTag(Constants.DOWNLOAD_TAG)
if (fragment2 != null) {
getSupportFragmentManager().beginTransaction().remove(fragment2).commit()
}
}
private val playerListener by lazy {
object : Player.EventListener {
override fun onPlayerError(error: ExoPlaybackException) {
super.onPlayerError(error)
//onError(error)
}
override fun onPlayerStateChanged(playWhenReady: Boolean, playbackState: Int) {
super.onPlayerStateChanged(playWhenReady, playbackState)
when (playbackState) {
Player.STATE_BUFFERING -> Log.e(TAG,"STATE_BUFFERING")
Player.STATE_ENDED -> Log.e(TAG,"STATE_ENDED")
Player.STATE_IDLE -> Log.e(TAG,"STATE_IDLE")
Player.STATE_READY -> {
// setPlayPause(playWhenReady)
isPlaying = playWhenReady
mPlayer.setPlayWhenReady(playWhenReady)
if (!isPlaying) {
media_button.setImageResource(R.drawable.ic_play_arrow_black_24dp)
} else {
setProgress()
media_button.setImageResource(R.drawable.ic_pause_black_24dp)
}
if (playWhenReady) {
Log.e(TAG, "PlaybackStatus.PLAYING")
} else {
Log.e(TAG, "PlaybackStatus.PAUSED")
}
titleTxt.setHtmlText(mSongList[mPlayer.currentWindowIndex].name)
MyLog.e(TAG, "====== " + mSongList[mPlayer.currentWindowIndex].name)
MyLog.e(TAG, "======111 " + mSongList[mPlayer.currentWindowIndex].descripation)
}
else -> Log.e(TAG, "PlaybackStatus.IDLE")
}
}
}
}
private fun startService() {
val myService = Intent(this, MusicPlayerService ::class.java)
Util.startForegroundService(this,myService)
}
private fun stopService() {
val myService = Intent(this, MusicPlayerService ::class.java)
stopService(myService)
}
private fun setPlayPause(play: Boolean) {
if(mBound) {
if(mMusicPlayerService.isPlaying()) {
mMusicPlayerService.pause()
media_button.setImageResource(R.drawable.ic_play_arrow_black_24dp)
} else {
startService()
playerNotificationManager = mMusicPlayerService.getNotificationInstance()!!
/* if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
startForegroundService(intent)
} else {
startService(intent)
}*/
mMusicPlayerService.play()
setProgress()
media_button.setImageResource(R.drawable.ic_pause_black_24dp)
}
}
/*isPlaying = play
exoPlayer.setPlayWhenReady(play)
if (!isPlaying) {
media_button.setImageResource(R.drawable.ic_play_arrow_black_24dp)
} else {
setProgress()
media_button.setImageResource(R.drawable.ic_pause_black_24dp)
}*/
}
private fun stringForTime(timeMs: Int): String {
val mFormatBuilder: StringBuilder
val mFormatter: Formatter
mFormatBuilder = StringBuilder()
mFormatter = Formatter(mFormatBuilder, Locale.getDefault())
val totalSeconds = timeMs / 1000
val seconds = totalSeconds % 60
val minutes = totalSeconds / 60 % 60
val hours = totalSeconds / 3600
mFormatBuilder.setLength(0)
return if (hours > 0) {
mFormatter.format("%d:%02d:%02d", hours, minutes, seconds).toString()
} else {
mFormatter.format("%02d:%02d", minutes, seconds).toString()
}
}
private fun setProgress() {
seekPlayerProgress.progress = 0
seekPlayerProgress.max = mPlayer.getDuration().toInt() / 1000
position.setText(stringForTime(mPlayer.getCurrentPosition().toInt()))
duration.setText(stringForTime(mPlayer.getDuration().toInt()))
if (handler == null) handler = Handler()
//Make sure you update Seekbar on UI thread
handler!!.post(object : Runnable {
override fun run() {
if (mPlayer != null && ::mPlayer.isInitialized && isPlaying) {
seekPlayerProgress.max = mPlayer.getDuration().toInt() / 1000
val mCurrentPosition = mPlayer.getCurrentPosition().toInt() / 1000
seekPlayerProgress.progress = mCurrentPosition
position.setText(stringForTime(mPlayer.getCurrentPosition().toInt()))
duration.setText(stringForTime(mPlayer.getDuration().toInt()))
handler!!.postDelayed(this, 1000)
}
}
})
}
private fun initSeekBar() {
seekPlayerProgress.requestFocus()
seekPlayerProgress.setOnSeekBarChangeListener(object : SeekBar.OnSeekBarChangeListener {
override fun onProgressChanged(seekBar: SeekBar, progress: Int, fromUser: Boolean) {
if (!fromUser) {
// We're not interested in programmatically generated changes to
// the progress bar's position.
return
}
mPlayer.seekTo((progress * 1000).toLong())
}
override fun onStartTrackingTouch(seekBar: SeekBar) {
}
override fun onStopTrackingTouch(seekBar: SeekBar) {
}
})
seekPlayerProgress.setMax(0)
seekPlayerProgress.setMax(mPlayer.getDuration().toInt() / 1000)
}
private var doubleBackToExitPressedOnce = false
override fun onBackPressed() {
val fragment = getSupportFragmentManager().findFragmentByTag(Constants.SUB_CATEGORY_TAG)
if (fragment != null) {
getSupportFragmentManager().beginTransaction().remove(fragment).commit()
return
}
val fragment2 = getSupportFragmentManager().findFragmentByTag(Constants.DOWNLOAD_TAG)
if (fragment2 != null) {
getSupportFragmentManager().beginTransaction().remove(fragment2).commit()
return
}
if (doubleBackToExitPressedOnce) {
super.onBackPressed()
return
}
this.doubleBackToExitPressedOnce = true
this.showSnackBarToast("Please click BACK again to exit")
Handler().postDelayed(Runnable { doubleBackToExitPressedOnce = false }, 2000)
}
override fun onDestroy() {
if(::playerNotificationManager.isInitialized) {
playerNotificationManager.setPlayer(null)
}
killPlayer()
// stopService()
MyLog.e(TAG," #### onDestroy #### ")
super.onDestroy()
}
override fun onStop() {
super.onStop()
if(mBound) {
unbindService(mServiceConnection)
mBound = false
}
LocalBroadcastManager.getInstance(this)
.unregisterReceiver(broadCastReceiver)
MyLog.e(TAG," #### onStop #### ")
}
private fun killPlayer() {
if (mPlayer != null) {
mPlayer.release()
mediaSource = null
}
MyLog.e(TAG,"#### killPlayer ####")
}
private fun getHtmlText(str:String):String {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
return (Html.fromHtml(str, Html.FROM_HTML_MODE_COMPACT)).toString()
} else {
return (Html.fromHtml(str)).toString()
}
}
private fun setMediaSession() {
mediaSession = MediaSessionCompat(this@MainActivity,"MEDIA_SESSION_TAG")
mediaSession.isActive = true
playerNotificationManager.setMediaSessionToken(mediaSession.sessionToken) //enhance media stye notification and provide artwork in lock screen
mediaSessionConnector = MediaSessionConnector(mediaSession)
//timeline is the internal representation of the pllaylist after the player has been prepared
mediaSessionConnector.setQueueNavigator(object : TimelineQueueNavigator(mediaSession){
override fun getMediaDescription(player: Player?, windowIndex: Int): MediaDescriptionCompat {
return getMediaDescriptionData(this@MainActivity, mSongList[windowIndex])
}
})
mediaSessionConnector.setPlayer(exoPlayer/*, null*/) //sync player wth media session
}
fun getMediaDescriptionData(context: Context, sample: RecentSong): MediaDescriptionCompat {
val extras = Bundle()
val options = BitmapFactory.Options()
options.inSampleSize = 8
// val bitmap = BitmapFactory.decodeFile(getBitmap(context, sample.bitmapResource), options)
val bitmap = context.getBitmap(R.drawable.bg)
extras.putParcelable(MediaMetadataCompat.METADATA_KEY_ALBUM_ART, bitmap)
extras.putParcelable(MediaMetadataCompat.METADATA_KEY_DISPLAY_ICON, bitmap)
return MediaDescriptionCompat.Builder()
.setMediaId(sample.song)
.setIconBitmap(bitmap)
.setTitle(sample.name)
.setDescription(sample.descripation)
.setExtras(extras)
.build()
}
override fun onStart() {
super.onStart()
bindService(Intent(this,MusicPlayerService::class.java),mServiceConnection,Context.BIND_AUTO_CREATE)
LocalBroadcastManager.getInstance(this)
.registerReceiver(broadCastReceiver, IntentFilter(MusicPlayerService().MUSIC_COMPLETED))
}
val broadCastReceiver = object : BroadcastReceiver() {
override fun onReceive(contxt: Context?, intent: Intent?) {
MyLog.e(TAG,"onReceive: ${intent?.getBooleanExtra(MESSAGE_KEY,false)}")
if(intent!!.getBooleanExtra(MESSAGE_KEY,false)) {
setPlayPause(intent.getBooleanExtra(MESSAGE_KEY,false))
if (intent.getBooleanExtra(MESSAGE_KEY,false)) {
Log.e(TAG, "PlaybackStatus.PLAYING")
} else {
Log.e(TAG, "PlaybackStatus.PAUSED")
}
titleTxt.setHtmlText(mSongList[mPlayer.currentWindowIndex].name)
MyLog.e(TAG,"====== "+mSongList[mPlayer.currentWindowIndex].name)
MyLog.e(TAG,"======111 "+mSongList[mPlayer.currentWindowIndex].descripation)
}
}
}
}
MusicPlayerService
import android.app.PendingIntent
import android.app.Service
import android.content.Context
import android.content.Intent
import android.graphics.Bitmap
import android.graphics.drawable.Drawable
import android.net.Uri
import android.os.Binder
import android.os.IBinder
import androidx.localbroadcastmanager.content.LocalBroadcastManager
import com.brahmakumaris.MainActivity
import com.brahmakumaris.R
import com.brahmakumaris.model.getDashboard.RecentSong
import com.brahmakumaris.util.MyLog
import com.brahmakumaris.util.getBitmap
import com.brahmakumaris.util.getPlaintextfromHtmlHtmlText
import com.bumptech.glide.Glide
import com.bumptech.glide.request.target.CustomTarget
import com.bumptech.glide.request.transition.Transition
import com.google.android.exoplayer2.Player
import com.google.android.exoplayer2.SimpleExoPlayer
import com.google.android.exoplayer2.extractor.DefaultExtractorsFactory
import com.google.android.exoplayer2.source.ConcatenatingMediaSource
import com.google.android.exoplayer2.source.ProgressiveMediaSource
import com.google.android.exoplayer2.ui.PlayerNotificationManager
import com.google.android.exoplayer2.upstream.DefaultDataSourceFactory
import com.google.android.exoplayer2.util.Util
class MusicPlayerService : Service() {
private val TAG = javaClass.simpleName
private val mContext: Context = this
private val mBinder = MyServiceBinder()
val MUSIC_COMPLETED = "music completed"
val mPlayer: SimpleExoPlayer by lazy { SimpleExoPlayer.Builder(this).build() }
private lateinit var playerNotificationManager: PlayerNotificationManager
var mSongList: ArrayList<RecentSong> = ArrayList()
override fun onCreate() {
super.onCreate()
MyLog.d(TAG,"onCreate: ")
}
fun playSong(mSongList: ArrayList<RecentSong> = ArrayList(), position: Int = 0)/* mContext: Context = this*/ {
this.mSongList = mSongList
val dataSourceFactory = DefaultDataSourceFactory(mContext, Util.getUserAgent(mContext,getString(R.string.app_name)))
val concateMediaSource = ConcatenatingMediaSource()
for (i in mSongList) {
val mediaSource = ProgressiveMediaSource
.Factory(
DefaultDataSourceFactory(mContext, dataSourceFactory),
DefaultExtractorsFactory()
)
.createMediaSource(/*i.uri*/Uri.parse(i.musicFile))
concateMediaSource.addMediaSource(mediaSource)
}
mPlayer.prepare(concateMediaSource)
mPlayer.seekToDefaultPosition(position)
mPlayer.playWhenReady =true
setNotification()
}
private fun setNotification() {
playerNotificationManager = PlayerNotificationManager.createWithNotificationChannel(
this,"channel_id",R.string.channelName,R.string.channelDescription,11,
object : PlayerNotificationManager.MediaDescriptionAdapter{
override fun createCurrentContentIntent(player: Player): PendingIntent? {
val intent = Intent(mContext, MainActivity::class.java)
return PendingIntent.getActivity(mContext,0,intent, PendingIntent.FLAG_UPDATE_CURRENT)
}
override fun getCurrentContentText(player: Player): String? {
// return mSongList[player.currentWindowIndex].descripation // descrption
return mSongList[player.currentWindowIndex].descripation.getPlaintextfromHtmlHtmlText() // descrption
}
override fun getCurrentContentTitle(player: Player): String {
// return mSongList[player.currentWindowIndex].name // title
return mSongList[player.currentWindowIndex].name.getPlaintextfromHtmlHtmlText()
}
override fun getCurrentLargeIcon(
player: Player,
callback: PlayerNotificationManager.BitmapCallback
): Bitmap? {
return mContext.getBitmap(R.drawable.bg)
}
} ,object : PlayerNotificationManager.NotificationListener {
override fun onNotificationStarted(notificationId: Int, notification: Notification) {
startForeground(notificationId,notification)
}
override fun onNotificationPosted(notificationId: Int, notification: Notification, ongoing: Boolean) {
startForeground(notificationId,notification)
}
override fun onNotificationCancelled(notificationId: Int, dismissedByUser: Boolean) {
stopSelf()
}
override fun onNotificationCancelled(notificationId: Int) {
stopSelf()
}
}
)
//show hide button
playerNotificationManager.setUseStopAction(false) //stop song
playerNotificationManager.setRewindIncrementMs(0) //hide rewind button
playerNotificationManager.setFastForwardIncrementMs(0) //hide fast forward button
playerNotificationManager.setPlayer(mPlayer)
}
inner class MyServiceBinder : Binder() {
fun getService(): MusicPlayerService = this@MusicPlayerService
}
fun getPlayerInstance(): SimpleExoPlayer? {
return mPlayer
}
fun getNotificationInstance(): PlayerNotificationManager? {
return playerNotificationManager
}
override fun onStartCommand(intent: Intent?, flags: Int, startId: Int): Int {
MyLog.d(TAG,"onStartCommand: ")
return START_NOT_STICKY
}
override fun onBind(intent: Intent?): IBinder? {
MyLog.d(TAG,"onBind: ")
return mBinder
}
override fun onUnbind(intent: Intent?): Boolean {
MyLog.d(TAG,"onUnbind: ")
return true
}
override fun onRebind(intent: Intent?) {
MyLog.d(TAG,"onRebind: ")
super.onRebind(intent)
}
override fun onDestroy() {
MyLog.e(TAG,"onDestroy: ")
super.onDestroy()
mPlayer.release()
if(::playerNotificationManager.isInitialized) {
playerNotificationManager.setPlayer(null)
}
}
// public client method
fun isPlaying():Boolean {
return mPlayer.isPlaying
}
fun play() {
mPlayer.setPlayWhenReady(true)
}
fun pause() {
mPlayer.setPlayWhenReady(false)
}
}
[如果我最小化该应用程序，那么它将取消绑定打印，然后直接进入onDestroy为什么会发生这种情况，任何人都可以帮助我，
高度赞赏任何帮助。
您应该将startForeground（）与一个通知一起使用，以永不停止运行的Android服务。
startForeground(1, notification)
请看一下。https://robertohuertas.com/2019/06/29/android_foreground_services/
我希望这会对您有所帮助。
我只是删除了onStop的取消绑定和注销的代码，并设置了onDestroy，它对我有用。