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J'ai eu 2 Activités (à savoir MainActivity qui montre la liste des chansons et un contrôleur multimédia par défaut en bas, et un AndroidBuildingMusicPlayerActivity avec une mise en page personnalisée pour la lecture) et un Bound Un service. Le problème est lié aux fonctions playNext et playPrevios (de la classe MusicService) qui fonctionnaient correctement à partir du contrôleur MainActivity alors qu'il fonctionnait mal (sorte de mélange) de l'autre activité. J'ai ensuite retiré le contrôleur MainActivity (puisque je ne le veux pas). J'ai travaillé sur la correction du playNext et du playPrevios de l'AndroidBuildingMusicPlayerActivity, mais le problème persiste. Comment résoudre ce problème? Merci d'avance.Musique Lecture Suivant et Lecture Précédent ne fonctionnent pas dans le studio Android
Ce sont les codes:
Musicservice:
public void onCreate(){
super.onCreate();
songPosn=0;
player = new MediaPlayer();
initMusicPlayer();
rand=new Random();
}
@Override
public void onDestroy() {
stopForeground(true);
}
public class MusicBinder extends Binder {
MusicService getService() {
return MusicService.this;
}
}
//initializes the MediaPlayer class
public void initMusicPlayer(){
//set player properties
player.setWakeMode(getApplicationContext(),
PowerManager.PARTIAL_WAKE_LOCK);
player.setAudioStreamType(AudioManager.STREAM_MUSIC);
player.setOnPreparedListener(this);
player.setOnCompletionListener(this);
player.setOnErrorListener(this);
}
public void setList(ArrayList<Song> theSongs){
songs=theSongs;
}
//Let's now set the app up to play a track
public void playSong(){
player.reset();
//get song
Song playSong = songs.get(songPosn);
songTitle=playSong.getTitle();
//get id
long currSong = playSong.getID();
//set uri
Uri trackUri = ContentUris.withAppendedId(
android.provider.MediaStore.Audio.Media.EXTERNAL_CONTENT_URI,
currSong);
try{
player.setDataSource(getApplicationContext(), trackUri);
}
catch(Exception e){
Log.e("MUSIC SERVICE", "Error setting data source", e);
}
player.prepareAsync();
}
//We will call this when the user picks a song from the list.
public void setSong(int songIndex){
songPosn=songIndex;
}
public void playPrev(){
songPosn--;
if(songPosn<0) songPosn=songs.size()-1;
playSong();
}
//skip to next
public void playNext(){
if(shuffle){
int newSong = songPosn;
while(newSong==songPosn){
newSong=rand.nextInt(songs.size());
}
songPosn=newSong;
}
else{
songPosn++;
if(songPosn>=songs.size()) songPosn=0;
}
playSong();
}
public int getPosn(){
return player.getCurrentPosition();
}
public int getDur(){
return player.getDuration();
}
public boolean isPng(){
return player.isPlaying();
}
public void pausePlayer(){
player.pause();
}
public void seek(int posn){
player.seekTo(posn);
}
public void go(){
player.start();
}
public void setShuffle(){
if(shuffle) shuffle=false;
else shuffle=true;
}
//When the MediaPlayer is prepared, the onPrepared method will be executed.
@Override
public void onPrepared(MediaPlayer mp) {
//start playback
mp.start();
Intent notIntent = new Intent(this, MainActivity.class);
notIntent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
PendingIntent pendInt = PendingIntent.getActivity(this, 0,
notIntent, PendingIntent.FLAG_UPDATE_CURRENT);
Notification.Builder builder = new Notification.Builder(this);
builder.setContentIntent(pendInt)
.setSmallIcon(R.drawable.play)
.setTicker(songTitle)
.setOngoing(true)
.setContentTitle("Playing").setContentText(songTitle);
Notification not = builder.build();
startForeground(NOTIFY_ID, not);
}
@Override
public void onCompletion(MediaPlayer mp) {
if(player.getCurrentPosition()>0){
mp.reset();
playNext();
}
}
@Override
public boolean onError(MediaPlayer mp, int what, int extra) {
mp.reset();
return false;
}
@Override
public IBinder onBind(Intent intent) {
return musicBind;
}
@Override
public boolean onUnbind(Intent intent){
player.stop();
player.release();
return false;
}
AndroidBuildingMusicPlayerActivity:
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.player);
// All player buttons
btnPlay = (ImageButton) findViewById(R.id.btnPlay);
btnNext = (ImageButton) findViewById(R.id.btnNext);
btnPrevious = (ImageButton) findViewById(R.id.btnPrevious);
btnRepeat = (ImageButton) findViewById(R.id.btnRepeat);
btnShuffle = (ImageButton) findViewById(R.id.btnShuffle);
songProgressBar = (SeekBar) findViewById(R.id.songProgressBar);
songTitleLabel = (TextView) findViewById(R.id.songTitle);
songCurrentDurationLabel = (TextView) findViewById(R.id.songCurrentDurationLabel);
songTotalDurationLabel = (TextView) findViewById(R.id.songTotalDurationLabel);
equalizer = (EqualizerView) findViewById(R.id.equalizer_view);
// Mediaplayer
mp = new MediaPlayer();
utils = new Utilities();
songProgressBar.setOnSeekBarChangeListener(this);
// set Progress bar values
songProgressBar.setProgress(0);
songProgressBar.setMax(100);
// Updating progress bar
updateProgressBar();
}
@Override
protected void onStart() {
super.onStart();
if(playIntent2==null){
playIntent2 = new Intent(this, MusicService.class);
bindService(playIntent2, musicConnection2, Context.BIND_AUTO_CREATE);
startService(playIntent2);
}
}
@Override
protected void onPause() {
super.onPause();
}
//connect to the service
private ServiceConnection musicConnection2 = new ServiceConnection(){
@Override
public void onServiceConnected(ComponentName name, IBinder service) {
MusicService.MusicBinder binder = (MusicService.MusicBinder)service;
//get service
ms = binder.getService();
musicBound2 = true;
}
@Override
public void onServiceDisconnected(ComponentName name) {
musicBound2 = false;
}
};
public void updateProgressBar() {
mHandler.postDelayed(mUpdateTimeTask, 100);
}
/**
* Background Runnable thread
* */
private Runnable mUpdateTimeTask = new Runnable() {
public void run() {
long totalDuration = ms.getDur();
long currentDuration = ms.getPosn();
// Displaying Total Duration time
songTotalDurationLabel.setText(""+utils.milliSecondsToTimer(totalDuration));
// Displaying time completed playing
songCurrentDurationLabel.setText(""+utils.milliSecondsToTimer(currentDuration));
// Updating progress bar
int progress = (int)(utils.getProgressPercentage(currentDuration, totalDuration));
//Log.d("Progress", ""+progress);
songProgressBar.setProgress(progress);
// Running this thread after 100 milliseconds
mHandler.postDelayed(this, 100);
}
};
@Override
public void onProgressChanged(SeekBar seekBar, int progress, boolean fromTouch) {
}
/**
* When user starts moving the progress handler
* */
@Override
public void onStartTrackingTouch(SeekBar seekBar) {
// remove message Handler from updating progress bar
mHandler.removeCallbacks(mUpdateTimeTask);
}
/**
* When user stops moving the progress hanlder
* */
@Override
public void onStopTrackingTouch(SeekBar seekBar) {
mHandler.removeCallbacks(mUpdateTimeTask);
int totalDuration = ms.getDur();
int currentPosition = utils.progressToTimer(seekBar.getProgress(), totalDuration);
// forward or backward to certain seconds
ms.seek(currentPosition);
// update timer progress again
updateProgressBar();
}
public void playClicked(View view){
if(!ms.isPng()){
btnPlay.setImageResource(R.drawable.btn_pause);
ms.go();
equalizer.animateBars();
}
else {
btnPlay.setImageResource(R.drawable.btn_play);
ms.pausePlayer();
equalizer.stopBars();
}
}
public void prvClicked(View view){
ms.playPrev();
}
public void nextClicked(View view){
ms.playNext();
}
MainActivity:
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
if (checkSelfPermission(Manifest.permission.READ_EXTERNAL_STORAGE)
!= PackageManager.PERMISSION_GRANTED) {
requestPermissions(new String[]{Manifest.permission.READ_EXTERNAL_STORAGE},1);
// MY_PERMISSIONS_REQUEST_READ_EXTERNAL_STORAGE is an
// app-defined int constant
return;
}
}
songView = (ListView)findViewById(R.id.song_list);
songList = new ArrayList<Song>();
getSongList();
Collections.sort(songList, new Comparator<Song>(){
public int compare(Song a, Song b){
return a.getTitle().compareTo(b.getTitle());
}
});
SongAdapter songAdt = new SongAdapter(this, songList);
songView.setAdapter(songAdt);
}
@Override
protected void onStart() {
super.onStart();
if(playIntent==null){
playIntent = new Intent(this, MusicService.class);
bindService(playIntent, musicConnection, Context.BIND_AUTO_CREATE);
startService(playIntent);
}
}
@Override
protected void onResume(){
super.onResume();
}
@Override
protected void onPause(){
super.onPause();
}
@Override
protected void onStop() {
super.onStop();
}
@Override
protected void onDestroy() {
stopService(playIntent);
musicSrv=null;
super.onDestroy();
}
//connect to the service
private ServiceConnection musicConnection = new ServiceConnection(){
@Override
public void onServiceConnected(ComponentName name, IBinder service) {
MusicService.MusicBinder binder = (MusicService.MusicBinder)service;
//get service
musicSrv = binder.getService();
//pass list
musicSrv.setList(songList);
musicBound = true;
}
@Override
public void onServiceDisconnected(ComponentName name) {
musicBound = false;
}
};
public void getSongList() {
ContentResolver musicResolver = getContentResolver();
Uri musicUri = android.provider.MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;
Cursor musicCursor = musicResolver.query(musicUri, null, null, null, null);
if(musicCursor!=null && musicCursor.moveToFirst()){
//get columns
int titleColumn = musicCursor.getColumnIndex
(android.provider.MediaStore.Audio.Media.TITLE);
int idColumn = musicCursor.getColumnIndex
(android.provider.MediaStore.Audio.Media._ID);
int artistColumn = musicCursor.getColumnIndex
(android.provider.MediaStore.Audio.Media.ARTIST);
//add songs to list
do {
long thisId = musicCursor.getLong(idColumn);
String thisTitle = musicCursor.getString(titleColumn);
String thisArtist = musicCursor.getString(artistColumn);
songList.add(new Song(thisId, thisTitle, thisArtist));
}
while (musicCursor.moveToNext());
}
}
//when user clicks on a song
public void songPicked(View view){
musicSrv.setSong(Integer.parseInt(view.getTag().toString()));
musicSrv.playSong();
Intent intent = new Intent(this, AndroidBuildingMusicPlayerActivity.class);
startActivity(intent);
}
erreurs que j'ai trouvé:
Attempt to call getDuration without a valid mediaplayer
E/MediaPlayer: error (-38, 0).
Alors je viens juste retiré de la barre de recherche AndroidBuildingMusicPlayerActivity qui a résolu le problème, mais comment puis-je mettre en œuvre la barre de recherche alors?