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我想添加一個automatically play next song選項，當我的Android應用程序完成前一個。我嘗試了很多方法，但都失敗了。請給出完整的代碼，而不是提示。 下面是完整的類：如何在我的Android應用中添加自動播放下一首歌曲選項？
public class AlbumPlayActivity extends AppCompatActivity implements View.OnClickListener {
private List<SongListModel> songs = new ArrayList<SongListModel>();
private SongAdapter songAdapter;
String URL_SONGS;
String URL_ALBUM_ART;
String URL_ALBUM_ART_BIG;
String URL_ALBUM_ART_BLUR;
String URL_MP3;
ListView lvSongs;
MediaPlayer mediaPlayer;
NetworkImageView nivAlbumArt,nivAlbumArtBlur;
private double startTime = 0;
private double finalTime = 0;
private Handler myHandler = new Handler();
public int currentlyPlaying;
private int forwardTime = 5000;
private int backwardTime = 5000;
private SeekBar seekbar;
ImageLoader imageLoader = AppController.getInstance().getImageLoader();
public int oneTimeOnly = 0;
int songID = 0;
ImageButton ibPrev, ibPlay, ibPause, ibNext, ibFastForward, ibFastRewind;
TextView tvStartTime, tvEndTime;
RelativeLayout llList;
ImageButton ibShare;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_album_play);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
getSupportActionBar().setDisplayShowTitleEnabled(false);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
getSupportActionBar().setDisplayShowHomeEnabled(true);
URL_SONGS = getIntent().getExtras().getString("URL_SONG");
URL_ALBUM_ART = getIntent().getExtras().getString("URL_ALBUM_ART");
URL_ALBUM_ART_BIG = getIntent().getExtras().getString("URL_ALBUM_ART_BIG");
URL_ALBUM_ART_BLUR = getIntent().getExtras().getString("URL_ALBUM_ART_BLUR");
imageLoader = AppController.getInstance().getImageLoader();
lvSongs = (ListView) findViewById(R.id.lvSongList);
nivAlbumArt = (NetworkImageView) findViewById(R.id.nivAlbumArt);
ibNext = (ImageButton) findViewById(R.id.ibNext);
ibPlay = (ImageButton) findViewById(R.id.ibPlay);
ibFastRewind = (ImageButton) findViewById(R.id.ibFastRewind);
ibFastForward = (ImageButton) findViewById(R.id.ibFastForward);
ibPrev = (ImageButton) findViewById(R.id.ibPrev);
seekbar = (SeekBar) findViewById(R.id.seekBar);
tvStartTime = (TextView) findViewById(R.id.tvStartTime);
tvEndTime = (TextView) findViewById(R.id.tvEndTime);
llList = (RelativeLayout)findViewById(R.id.llList);
ibShare = (ImageButton)findViewById(R.id.ibShare);
seekbar.setClickable(false);
ibNext.setOnClickListener(this);
ibPlay.setOnClickListener(this);
ibPrev.setOnClickListener(this);
ibFastRewind.setOnClickListener(this);
ibFastForward.setOnClickListener(this);
ibShare.setOnClickListener(this);
songAdapter = new SongAdapter(this, songs);
lvSongs.setAdapter(songAdapter);
loadSongs();
lvSongs.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
songs.get(songID).setVisible(false);
songAdapter.notifyDataSetChanged();
songID = position;
stopPlaying();
URL_MP3 = "http://.../apps/content/mp3/" + songs.get(position).getSong().replace(" ", "%20");
songs.get(songID).setVisible(true);
mediaPlayer = new MediaPlayer();
mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
try {
mediaPlayer.setDataSource(URL_MP3);
} catch (IOException e) {
e.printStackTrace();
}
mediaPlayer.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
@Override
public void onPrepared(MediaPlayer mp) {
mp.start();
ibPlay.setImageResource(R.drawable.ic_pause_circle_outline_white_48dp);
finalTime = mp.getDuration();
startTime = mp.getCurrentPosition();
if (oneTimeOnly == 0) {
seekbar.setMax((int) finalTime);
oneTimeOnly = 1;
}
tvEndTime.setText(String.format("%d:%d",
TimeUnit.MILLISECONDS.toMinutes((long) finalTime),
TimeUnit.MILLISECONDS.toSeconds((long) finalTime) -
TimeUnit.MINUTES.toSeconds(TimeUnit.MILLISECONDS.toMinutes((long) finalTime)))
);
tvStartTime.setText(String.format("%d:%d",
TimeUnit.MILLISECONDS.toMinutes((long) startTime),
TimeUnit.MILLISECONDS.toSeconds((long) startTime) -
TimeUnit.MINUTES.toSeconds(TimeUnit.MILLISECONDS.toMinutes((long) startTime)))
);
seekbar.setProgress((int) startTime);
myHandler.postDelayed(UpdateSongTime, 100);
}
});
mediaPlayer.prepareAsync();
}
});
seekbar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
@Override
public void onStopTrackingTouch(SeekBar seekBar) {
}
@Override
public void onStartTrackingTouch(SeekBar seekBar) {
}
@Override
public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
if(mediaPlayer != null && fromUser){
mediaPlayer.seekTo(progress);
}
}
});
}
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.ibPrev:
songs.get(songID).setVisible(false);
songAdapter.notifyDataSetChanged();
songID--;
if(songID<0){
songID=0;
}
if (songID >= 0) {
startPlaying("http://.../apps/content/mp3/" + songs.get(songID).getSong().replace(" ", "%20"));
songs.get(songID).setVisible(true);
songAdapter.notifyDataSetChanged();
}
break;
case R.id.ibPlay:
if (mediaPlayer.isPlaying()) {
if (mediaPlayer != null) {
mediaPlayer.pause();
Log.i("Status:", " Paused");
ibPlay.setImageResource(R.drawable.ic_play_circle_outline_white_48dp);
}
} else {
if (mediaPlayer != null) {
mediaPlayer.start();
Log.i("Status:", " Playing");
ibPlay.setImageResource(R.drawable.ic_pause_circle_outline_white_48dp);
finalTime = mediaPlayer.getDuration();
startTime = mediaPlayer.getCurrentPosition();
if (oneTimeOnly == 0) {
seekbar.setMax((int) finalTime);
oneTimeOnly = 1;
}
tvEndTime.setText(String.format("%d:%d",
TimeUnit.MILLISECONDS.toMinutes((long) finalTime),
TimeUnit.MILLISECONDS.toSeconds((long) finalTime) -
TimeUnit.MINUTES.toSeconds(TimeUnit.MILLISECONDS.toMinutes((long) finalTime)))
);
tvStartTime.setText(String.format("%d:%d",
TimeUnit.MILLISECONDS.toMinutes((long) startTime),
TimeUnit.MILLISECONDS.toSeconds((long) startTime) -
TimeUnit.MINUTES.toSeconds(TimeUnit.MILLISECONDS.toMinutes((long) startTime)))
);
seekbar.setProgress((int) startTime);
myHandler.postDelayed(UpdateSongTime, 100);
}
}
break;
case R.id.ibShare:
Intent sendIntent = new Intent();
sendIntent.setAction(Intent.ACTION_SEND);
sendIntent.putExtra(Intent.EXTRA_TEXT, "Welcome to music radio");
sendIntent.setType("text/plain");
startActivity(sendIntent);
break;
case R.id.ibNext:
songs.get(songID).setVisible(false);
songAdapter.notifyDataSetChanged();
songID++;
if (songID==songs.size()){
ibNext.setEnabled(false);
}
if (songID <= songs.size()) {
startPlaying("http://..../apps/content/mp3/" + songs.get(songID).getSong().replace(" ", "%20"));
songs.get(songID).setVisible(true);
songAdapter.notifyDataSetChanged();
}
break;
case R.id.ibFastForward:
int temp = (int) startTime;
if ((temp + forwardTime) <= finalTime) {
startTime = startTime + forwardTime;
mediaPlayer.seekTo((int) startTime);
} else {
Toast.makeText(getApplicationContext(), "Cannot jump forward 5 seconds", Toast.LENGTH_SHORT).show();
}
break;
case R.id.ibFastRewind:
int temp1 = (int) startTime;
if ((temp1 - backwardTime) > 0) {
startTime = startTime - backwardTime;
mediaPlayer.seekTo((int) startTime);
} else {
Toast.makeText(getApplicationContext(), "Cannot jump backward 5 seconds", Toast.LENGTH_SHORT).show();
}
break;
}
}
public void loadSongs() {
JsonArrayRequest jsonArrayRequest = new JsonArrayRequest(URL_SONGS, new Response.Listener<JSONArray>() {
@Override
public void onResponse(JSONArray response) {
nivAlbumArt.setImageUrl(URL_ALBUM_ART_BIG, imageLoader);
Glide.with(AlbumPlayActivity.this).load(URL_ALBUM_ART_BLUR).asBitmap().into(new SimpleTarget<Bitmap>(700,300) {
@Override
public void onResourceReady(Bitmap resource, GlideAnimation<? super Bitmap> glideAnimation) {
Drawable drawable = new BitmapDrawable(resource);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
llList.setBackground(drawable);
}
}
});
for (int i = 0; i < response.length(); i++) {
try {
JSONObject jObj = response.getJSONObject(i);
SongListModel songModel = new SongListModel();
Log.i(">>REQ", jObj.toString());
songModel.setAlbum_id(jObj.getString("album_id"));
songModel.setCategory_id(jObj.getString("category_id"));
songModel.setId(jObj.getString("id"));
songModel.setSinger_id(jObj.getString("singer_id"));
songModel.setSong(jObj.getString("song"));
songs.add(songModel);
startPlaying("http://.../apps/content/mp3/" + songs.get(songID).getSong().replace(" ", "%20"));
songs.get(songID).setVisible(true);
} catch (JSONException e) {
e.printStackTrace();
}
}
songAdapter.notifyDataSetChanged();
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
}
});
jsonArrayRequest.setRetryPolicy(new DefaultRetryPolicy(
(int) TimeUnit.SECONDS.toMillis(20),
DefaultRetryPolicy.DEFAULT_MAX_RETRIES,
DefaultRetryPolicy.DEFAULT_BACKOFF_MULT));
AppController.getInstance().addToRequestQueue(jsonArrayRequest);
}
private void startPlaying(final String position) {
stopPlaying();
mediaPlayer = new MediaPlayer();
mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
try {
mediaPlayer.setDataSource(position);
} catch (IOException e) {
e.printStackTrace();
}
mediaPlayer.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
@Override
public void onPrepared(MediaPlayer mp) {
mp.start();
currentlyPlaying=songID; // member field (int)
finalTime = mp.getDuration();
startTime = mp.getCurrentPosition();
ibPlay.setImageResource(R.drawable.ic_pause_circle_outline_white_48dp);
if (oneTimeOnly == 0) {
seekbar.setMax((int) finalTime);
oneTimeOnly = 1;
}
tvEndTime.setText(String.format("%d:%d",
TimeUnit.MILLISECONDS.toMinutes((long) finalTime),
TimeUnit.MILLISECONDS.toSeconds((long) finalTime) -
TimeUnit.MINUTES.toSeconds(TimeUnit.MILLISECONDS.toMinutes((long) finalTime)))
);
tvStartTime.setText(String.format("%d:%d",
TimeUnit.MILLISECONDS.toMinutes((long) startTime),
TimeUnit.MILLISECONDS.toSeconds((long) startTime) -
TimeUnit.MINUTES.toSeconds(TimeUnit.MILLISECONDS.toMinutes((long) startTime)))
);
seekbar.setProgress((int) startTime);
myHandler.postDelayed(UpdateSongTime, 100);
}
});
mediaPlayer.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
@Override
public void onCompletion(MediaPlayer mediaPlayer) {
if(currentlyPlaying >= songs.size()){
} else {
startPlaying(position);
}
}
});
mediaPlayer.prepareAsync();
}
private void stopPlaying() {
if (mediaPlayer != null) {
mediaPlayer.stop();
mediaPlayer.reset();
mediaPlayer.release();
mediaPlayer = null;
myHandler.removeCallbacks(UpdateSongTime);
}
}
@Override
public void onBackPressed() {
stopPlaying();
finish();
}
@Override
public boolean onCreateOptionsMenu (Menu menu) {
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
public boolean onOptionsItemSelected(MenuItem item) {
int id = item.getItemId();
if (id == android.R.id.home) {
stopPlaying();
finish();
return true;
}
if (id == R.id.action_home) {
stopPlaying();
Intent intent = new Intent(AlbumPlayActivity.this,HomeActivity.class);
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK|Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(intent);
finish();
return true;
}
return super.onOptionsItemSelected(item);
}
private Runnable UpdateSongTime = new Runnable() {
public void run() {
startTime = mediaPlayer.getCurrentPosition();
seekbar.setProgress((int) startTime);
tvStartTime.setText(String.format("%d:%d",
TimeUnit.MILLISECONDS.toMinutes((long) startTime),
TimeUnit.MILLISECONDS.toSeconds((long) startTime) -
TimeUnit.MINUTES.toSeconds(TimeUnit.MILLISECONDS.
toMinutes((long) startTime)))
);
myHandler.postDelayed(this, 100);
}
};
}
我想在我的應用程序修改。首先，我提交了一個方法，現在我提交了全班。一個人試圖幫助我，但我沒有成功，沒有正常工作。上次我更新了我的代碼，但它的播放器一次又一次地播放同一首歌曲請遵守我的代碼，並給我最好的建議。我不是專業的專家開發人員。我是應用程序開發的初學者。所以請給我確切的代碼。
什麼是'songs'名單內？也請提供你的startPlaying（）方法代碼 – Droidman
歌曲是'private List songs = new ArrayList （）;' –
我加了startPlaying方法。 Plase，幫助我。如果您需要任何其他信息，請通知我@Droidman –