我正在寻找一个用于学习目的的Android音乐播放器的基本实现。我想要的只是一个带有服务和oncompletionlistener的音乐播放器，可以移动到下一个音轨和通知。但我还没有找到类似的东西。任何帮助将不胜感激。提前谢谢。
答案 0 :(得分：1)
试试这段代码
VideoView videoView = (VideoView)findViewById(R.id.myvideoview);
videoView.setOnCompletionListener(this);//checks when end
File path = new File(mPath + "/" + "your file name");
videoView.setVideoPath(path.getAbsolutePath());
MediaController mediaController = new MediaController(this);
mediaController.setMediaPlayer(videoView);
mediaController.setAnchorView(videoView);
videoView.setMediaController(mediaController);
videoView.requestFocus();
videoView.start();
了解更多信息 http://www.vogella.de/articles/AndroidMedia/article.html
答案 1 :(得分：0)
试试这个：
//class
public class MusicPlayService extends Service {
//media player
private MediaPlayer player;
//song list
private ArrayList<Song> songs;
//current position
private int songPosn;
//binder
private final IBinder musicBind = new MusicBinder(); //very important
//title of current song
private String songTitle="";
private String songAlbumart="";
private String songDuration="";
//shuffle flag and random
private boolean shuffle=false;
private boolean ispaused=false;
private Random rand;
//todo pause music at time of call
Notification mNotification;
static RemoteViews mRemoteViews;
public static int currentPos=0;
NotificationManager mNotifiManager;
public static final int NOTIFICATION_IDFOREGROUND_SERVICE=78945;
public static final String ACTION_STOP="com.yourapp.ACTION_STOP";
public static final String ACTION_PLAY="com.yourapp.ACTION_PLAY";
public static final String ACTION_PAUSE="com.yourapp.ACTION_PAUSE";
public static final String ACTION_RESUME="com.yourapp.ACTION_RESUME";
public static final String ACTION_NEXT="com.yourapp.ACTION_NEXT";
public static final String ACTION_PREV="com.yourapp.ACTION_PREV";
int REQUEST_CODE_STOP=1111;
int REQUEST_CODE_PAUSE=2222;
int REQUEST_CODE_RESUME=3333;
int REQUEST_CODE_NEXT=4444;
int REQUEST_CODE_PREV=6666;
int REQUEST_CODE_ACTVITY=5555;
@Override
public void onCreate() {
super.onCreate();
//todo//see me
mNotifiManager=(NotificationManager)getSystemService(Context.NOTIFICATION_SERVICE);
//initialize position
songPosn=0;
//random
rand=new Random();
//create player
player = new MediaPlayer();
player.setAudioStreamType(AudioManager.STREAM_MUSIC);
//set listeners
player.setOnPreparedListener(this);
player.setOnCompletionListener(this);
player.setOnErrorListener(this);
}
//pass song list
public void setList(ArrayList<Song> theSongs){
songs=theSongs;
}
//binder
public class MusicBinder extends Binder {
MusicPlayService getService() {
return MusicPlayService.this;
}
}
//activity will bind to service
public IBinder onBind(Intent arg0) {
return musicBind;
}
//release resources when unbind
@Override
public boolean onUnbind(Intent intent){
//player.stop();
//player.release();
return false;
}
//set the song
public void setSong(int songIndex){
songPosn=songIndex;
}
//play a song
public void playSong(){
//play
player.reset();
//get song
Song playSong = songs.get(songPosn);
//get title
songTitle=playSong.DISPLAY_NAME;
songDuration=playSong.DURATION;
songAlbumart=playSong.ALBUMART;
//set the data source
try{
player.setDataSource(playSong.Path);
}
catch(Exception e){
Log.e("MUSIC SERVICE", "Error setting data source", e);
}
player.prepareAsync(); //this will call onPrepared
}
@Override
public void onPrepared(MediaPlayer mp) {
//start playback
mp.start();
//notification
showControllerInNotification(songTitle, songDuration,songAlbumart);
}
//playback methods
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 stopPlayer(){
player.stop();
}
public void seek(int posn){
player.seekTo(posn);
}
public void go(){
player.start();
}
//skip to previous track
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();
}
//toggle shuffle
public void setShuffle(){
if(shuffle) shuffle=false;
else shuffle=true;
}
public int onStartCommand(Intent intent, int flags, int startId) {
if (intent != null) {
String action = intent.getAction();
if (!TextUtils.isEmpty(action)) {
if (action.equals(ACTION_PLAY)) {
ispaused=false;
playSong();
}else if(action.equals(ACTION_PAUSE)) {
pausePlayer();
currentPos = getPosn();
ispaused=true;
}else if(action.equals(ACTION_RESUME)) {
seek(currentPos);
ispaused=false;
go();
}
else if(action.equals(ACTION_STOP)) {
ispaused=false;
player.stop();
mNotifiManager.cancel(NOTIFICATION_IDFOREGROUND_SERVICE);
}
else if(action.equals(ACTION_NEXT)) {
ispaused=false;
playNext();
}
else if(action.equals(ACTION_PREV)) {
ispaused=false;
playPrev();
}
}
}
return super.onStartCommand(intent, flags, startId);
}
@Override
public void onDestroy() {
//player.stop();
stopForeground(true);
}
@Override
public void onLowMemory() {
}
private void showControllerInNotification(String title,String duration,String songAlbumart) {
PendingIntent pendingIntent = null;
Intent intent = null;
//Inflate a remote view with a layout which you want to display in the notification bar.
if (mRemoteViews == null) {
mRemoteViews = new RemoteViews(getPackageName(),
R.layout.status_bar);
}
if(songAlbumart=="")
mRemoteViews.setImageViewResource(R.id.status_bar_album_art,R.drawable.musicplayericon);
else {
//Drawable image = Drawable.createFromPath(songAlbumart);
Bitmap bitmap = BitmapFactory.decodeFile(songAlbumart);
mRemoteViews.setImageViewBitmap(R.id.status_bar_album_art, bitmap);
//mRemoteViews.setImageViewResource(R.id.status_bar_album_art, image);
}
mRemoteViews.setTextViewText(R.id.status_bar_track_name, title);
float dua= Float.valueOf(duration);
dua=dua/60000;
//mRemoteViews.setTextViewText(R.id.status_bar_progress_music, String.format("%.2f", dua));
mRemoteViews.setImageViewResource(R.id.status_bar_playpause, R.drawable.apollo_holo_dark_pause);
mRemoteViews.setImageViewResource(R.id.status_bar_next, R.drawable.apollo_holo_dark_next);
//Define what you want to do after clicked the button in notification.
//Here we launcher a service by an action named "ACTION_STOP" which will stop the music play.
intent = new Intent(ACTION_STOP);
pendingIntent = PendingIntent.getService(getApplicationContext(),
REQUEST_CODE_STOP, intent,
PendingIntent.FLAG_UPDATE_CURRENT);
mRemoteViews.setOnClickPendingIntent(R.id.status_bar_collapse,
pendingIntent);
//mRemoteViews.setBackgroundColor(0x0000FF00);
Intent intentpause = new Intent(ACTION_PAUSE);
PendingIntent pendingIntentpause = PendingIntent.getService(getApplicationContext(),
REQUEST_CODE_PAUSE, intentpause,
PendingIntent.FLAG_UPDATE_CURRENT);
mRemoteViews.setOnClickPendingIntent(R.id.status_bar_playpause,
pendingIntentpause);
Intent intentnext = new Intent(ACTION_NEXT);
PendingIntent pendingIntentnext = PendingIntent.getService(getApplicationContext(),
REQUEST_CODE_NEXT, intentnext,
PendingIntent.FLAG_UPDATE_CURRENT);
mRemoteViews.setOnClickPendingIntent(R.id.status_bar_next,
pendingIntentnext);
Intent intentprev = new Intent(ACTION_PREV);
PendingIntent pendingIntentprev = PendingIntent.getService(getApplicationContext(),
REQUEST_CODE_PREV, intentprev,
PendingIntent.FLAG_UPDATE_CURRENT);
mRemoteViews.setOnClickPendingIntent(R.id.status_bar_prev,
pendingIntentprev);
Intent intentactivity=new Intent(getApplicationContext(),ListMusic.class);
PendingIntent pendingIntentActivity = PendingIntent.getActivity(getApplicationContext(),
REQUEST_CODE_ACTVITY, intentactivity,
PendingIntent.FLAG_UPDATE_CURRENT);
//Create the notification instance.
mNotification = new NotificationCompat.Builder(getApplicationContext())
.setSmallIcon(R.drawable.notificationimage)
.setOngoing(true)
.setWhen(System.currentTimeMillis())
.setContentIntent(pendingIntentActivity)
.setContent(mRemoteViews)
.build();
//mNotification.bigContentView=mRemoteViews;
//Show the notification in the notification bar.
mNotifiManager.notify(NOTIFICATION_IDFOREGROUND_SERVICE, mNotification);
}
@Override
public void onCompletion(MediaPlayer mp) {
//check if playback has reached the end of a track
if(player.getCurrentPosition()>0){
mp.reset();
playNext();
Log.e("MUSIC PLAYER", "Staring Next Song:"+songTitle);
}
}
@Override
public boolean onError(MediaPlayer mp, int what, int extra) {
Log.e("MUSIC PLAYER", "Playback Error");
mp.reset();
return false;
}
}