java.lang.IndexOutOfBoundsException: Index 0 invalide, la taille est 0 Android musicplayer

Question

Je développe une application de musique mais je continue à obtenir cette erreur, je ne comprends pas et ne sais pas comment résoudre. Je suis bloqué pendant 2 jours essayant de réécrire le code mais toujours l'erreur pops-up.Mon logcat apparaît comme java.lang.IndexOutOfBoundsException: Index 0 invalide, la taille est 0. Et s'il vous plaît élaborer le problème principal.

Ce MainActivity.java

package com.developer.bunamay.player; 

     import android.app.SearchManager; 
     import android.content.ComponentName; 
     import android.content.Context; 
     import android.content.Intent; 
     import android.content.ServiceConnection; 
     import android.content.res.Resources; 
     import android.graphics.Bitmap; 
     import android.graphics.PorterDuff; 
     import android.graphics.drawable.BitmapDrawable; 
     import android.os.Bundle; 
     import android.os.Handler; 
     import android.os.IBinder; 
     import android.os.Message; 
     import android.support.v4.content.ContextCompat; 
     import android.support.v7.app.AppCompatActivity; 
     import android.text.TextUtils; 
     import android.util.Log; 
     import android.view.Menu; 
     import android.view.MenuItem; 
     import android.view.View; 
     import android.view.animation.Animation; 
     import android.view.animation.AnimationUtils; 
     import android.widget.AdapterView; 
     import android.widget.Button; 
     import android.widget.ImageView; 
     import android.widget.LinearLayout; 
     import android.widget.ListView; 
     import android.widget.SearchView; 
     import android.widget.SeekBar; 
     import android.widget.TextView; 

     import java.util.List; 



public class MainActivity extends AppCompatActivity implements MusicService.MediaFileListener { 

public static final PlayerUtils PlayerController = PlayerUtils.getInstance(); 

public static final int PICK_FOLDER_REQUEST = 8; 
private MediaFileAdapter mediaFileAdapter = null; 
private TextView playingSong; 
private Button btnPause, btnPlay, btnNext, btnPrevious; 
private Button btnStop; 
private LinearLayout linearLayoutPlayingSong; 
private ListView mediaListView; 
private SeekBar seekbar; 
private TextView textBufferDuration, textDuration; 
private ImageView imageViewAlbumArt; 
private Context context; 

MusicService mService; 
boolean mBound = false; 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 
    context = MainActivity.this; 
    init(); 

    if (!PlayerUtils.isServiceRunning(MusicService.class.getName(), getApplicationContext())) { 
     Intent i = new Intent(getApplicationContext(), MusicService.class); 
     startService(i); 
    } 
} 

private void init() { 
    initViews(); 
    setListeners(); 
    playingSong.setSelected(true); 
    seekbar.getProgressDrawable().setColorFilter(ContextCompat.getColor(context, R.color.colorText), PorterDuff.Mode.SRC_IN); 
    if (PlayerController.SONGS_LIST.size() <= 0) { 
     PlayerController.SONGS_LIST = PlayerController.listOfSongs(getApplicationContext()); 
    } 
    initAdapter(); 
} 

private void initAdapter() { 
    mediaFileAdapter = new MediaFileAdapter(this, R.layout.custom_list, PlayerController.SONGS_LIST); 
    mediaListView.setAdapter(mediaFileAdapter); 
    mediaListView.setTextFilterEnabled(true); 
    mediaListView.setFastScrollEnabled(true); 
} 

private void initViews() { 
    playingSong = (TextView) findViewById(R.id.textNowPlaying); 
    mediaListView = (ListView) findViewById(R.id.listViewMusic); 
    btnPause = (Button) findViewById(R.id.btnPause); 
    btnPlay = (Button) findViewById(R.id.btnPlay); 
    linearLayoutPlayingSong = (LinearLayout) findViewById(R.id.linearLayoutPlayingSong); 
    seekbar = (SeekBar) findViewById(R.id.seekBar); 
    btnStop = (Button) findViewById(R.id.btnStop); 
    textBufferDuration = (TextView) findViewById(R.id.textBufferDuration); 
    textDuration = (TextView) findViewById(R.id.textDuration); 
    imageViewAlbumArt = (ImageView) findViewById(R.id.imageViewAlbumArt); 
    btnNext = (Button) findViewById(R.id.btnNext); 
    btnPrevious = (Button) findViewById(R.id.btnPrevious); 
} 

private Animation setButtonAnimation() { 
    return AnimationUtils.loadAnimation(this, R.anim.button_anim); 
} 

// defines callbacks for service binding, passed to bindService() 
private ServiceConnection mConnection = new ServiceConnection() { 

    @Override 
    public void onServiceConnected(ComponentName className, 
            IBinder service) { 
     MusicService.LocalBinder binder = (MusicService.LocalBinder) service; 
     mService = binder.getService(); 
     mService.setListener(MainActivity.this); 
     mBound = true; 

    } 

    @Override 
    public void onServiceDisconnected(ComponentName arg0) { 
     mBound = false; 
     mService = null; 

    } 
}; 


private void setListeners() { 
    mediaListView.setOnItemClickListener(new AdapterView.OnItemClickListener() { 
     @Override 
     public void onItemClick(AdapterView<?> parent, View item, int position, long id) { 
      PlayerController.SONG_PAUSED = false; 
      PlayerController.SONG_NUMBER = position; 
      boolean isServiceRunning = PlayerUtils.isServiceRunning(MusicService.class.getName(), getApplicationContext()); 
      if (!isServiceRunning) { 
       Intent i = new Intent(getApplicationContext(), MusicService.class); 
       startService(i); 
      } else { 
       PlayerController.SONG_CHANGE_HANDLER.sendMessage(
         PlayerController.SONG_CHANGE_HANDLER.obtainMessage()); 
      } 
      updateUI(); 
      changeButton(); 
     } 
    }); 

    btnPlay.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View v) { 
      PlayerController.playControl(getApplicationContext()); 
     } 
    }); 
    btnPause.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View v) { 
      PlayerController.pauseControl(getApplicationContext()); 
     } 
    }); 
    btnNext.setOnClickListener(new View.OnClickListener() { 

     @Override 
     public void onClick(View v) { 
      v.startAnimation(setButtonAnimation()); 
      PlayerController.nextControl(getApplicationContext()); 
     } 
    }); 
    btnPrevious.setOnClickListener(new View.OnClickListener() { 

     @Override 
     public void onClick(View v) { 
      v.startAnimation(setButtonAnimation()); 
      PlayerController.previousControl(getApplicationContext()); 
     } 
    }); 
    btnStop.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View v) { 
      if (PlayerUtils.isServiceRunning(MusicService.class.getName(), getApplicationContext())) { 
       PlayerController.pauseControl(getApplicationContext()); 
      } 
      linearLayoutPlayingSong.setVisibility(View.GONE); 
     } 
    }); 

    seekbar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() { 
     @Override 
     public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) { 
      if (fromUser) { 
       // clicked position on the seekBar 
       int currentSeekBarPosition = seekBar.getProgress(); 
       // 1% of song duration = song duration/100% 
       int onePercentOfSongDuration = (mService.getDuration()/100); 
       // associate song duration with clicked position on the seekBar 
       int changedPosition = currentSeekBarPosition * onePercentOfSongDuration; 

       // seek to selected position 
       PlayerController.seekToAnyControl(getApplicationContext(), changedPosition); 
      } 
     } 

     @Override 
     public void onStartTrackingTouch(SeekBar seekBar) { 
     } 

     @Override 
     public void onStopTrackingTouch(SeekBar seekBar) { 

     } 
    }); 
} 

@Override 
protected void onPause() { 
    if (mBound) { 
     unbindService(mConnection); 
    } 
    super.onPause(); 
} 

@Override 
protected void onResume() { 
    super.onResume(); 
    Intent i = new Intent(getApplicationContext(), MusicService.class); 
    bindService(i, mConnection, Context.BIND_AUTO_CREATE); 

    handleAudioFromOpenWithPopup(); 

    boolean isServiceRunning = PlayerUtils.isServiceRunning(MusicService.class.getName(), getApplicationContext()); 
    if (isServiceRunning) { 
     updateUI(); 
    } else { 
     linearLayoutPlayingSong.setVisibility(View.GONE); 
    } 
    changeButton(); 
    PlayerController.SEEKBAR_HANDLER = new Handler() { 
     @Override 
     public void handleMessage(Message msg) { 

      Integer i[] = (Integer[]) msg.obj; 
      textBufferDuration.setText(PlayerUtils.getDuration(i[0])); 
      textDuration.setText(PlayerUtils.getDuration(i[1])); 
      seekbar.setProgress(i[2]); 
     } 
    }; 
} 

public void updateUI() { 
    MediaFile mediaFile = PlayerController.SONGS_LIST.get(PlayerController.SONG_NUMBER); 
    String nowPlayingTitleText = mediaFile.getTitle() + " " + mediaFile.getArtist() + "-" + mediaFile.getAlbum(); 
    playingSong.setText(nowPlayingTitleText); 
    Bitmap albumArt = PlayerController.getAlbumart(context, mediaFile.getAlbumId()); 
    if (albumArt != null) { 
     imageViewAlbumArt.setBackgroundDrawable(new BitmapDrawable(Resources.getSystem(), albumArt)); 
    } else { 
     Bitmap defaultAlbumArt = PlayerController.getDefaultAlbumArt(context); 
     imageViewAlbumArt.setBackgroundDrawable(new BitmapDrawable(Resources.getSystem(), defaultAlbumArt)); 
    } 
    linearLayoutPlayingSong.setVisibility(View.VISIBLE); 
} 

public void changeButton() { 
    if (PlayerController.SONG_PAUSED) { 
     btnPause.setVisibility(View.GONE); 
     btnPlay.setVisibility(View.VISIBLE); 
    } else { 
     btnPause.setVisibility(View.VISIBLE); 
     btnPlay.setVisibility(View.GONE); 
    } 
} 

public void changeUI() { 
    updateUI(); 
    changeButton(); 
} 

@Override 
public boolean onCreateOptionsMenu(Menu menu) { 
    getMenuInflater().inflate(R.menu.menu_main, menu); 
    SearchManager searchManager = (SearchManager) getSystemService(Context.SEARCH_SERVICE); 

    // init menu items for search 
    MenuItem itemSearchTitle = menu.findItem(R.id.action_search_title); 
    MenuItem itemSearchAlbum = menu.findItem(R.id.action_search_album); 
    MenuItem itemSearchArtist = menu.findItem(R.id.action_search_artist); 

    SearchView searchViewTitle = (SearchView) itemSearchTitle.getActionView(); 
    SearchView searchViewAlbum = (SearchView) itemSearchAlbum.getActionView(); 
    SearchView searchViewArtist = (SearchView) itemSearchArtist.getActionView(); 

    searchViewTitle.setFocusable(true); 
    searchViewAlbum.setFocusable(true); 
    searchViewArtist.setFocusable(true); 

    // init searchable info for each menu item 
    searchViewTitle.setSearchableInfo(searchManager.getSearchableInfo(getComponentName())); 
    searchViewTitle.setQueryHint("title..."); 
    searchViewTitle.setIconified(true); 

    searchViewAlbum.setSearchableInfo(searchManager.getSearchableInfo(getComponentName())); 
    searchViewAlbum.setQueryHint("album..."); 
    searchViewAlbum.setIconified(true); 

    searchViewArtist.setSearchableInfo(searchManager.getSearchableInfo(getComponentName())); 
    searchViewArtist.setQueryHint("artist..."); 
    searchViewArtist.setIconified(true); 

    // set textChangeListeners for each type of search 
    final SearchView.OnQueryTextListener textChangeListenerTitle = new SearchView.OnQueryTextListener() { 
     @Override 
     public boolean onQueryTextChange(String newText) { 
      if (!TextUtils.isEmpty(newText)) { 
       mediaFileAdapter.getFilter().filter(newText); 
      } 
      return true; 
     } 

     @Override 
     public boolean onQueryTextSubmit(String query) { 
      return true; 
     } 
    }; 

    SearchView.OnQueryTextListener textChangeListenerAlbum = new SearchView.OnQueryTextListener() { 
     @Override 
     public boolean onQueryTextChange(String newText) { 
      if (!TextUtils.isEmpty(newText)) { 
       mediaFileAdapter.getFilter().filter(newText); 
      } 
      return true; 
     } 

     @Override 
     public boolean onQueryTextSubmit(String query) { 
      return true; 
     } 
    }; 

    SearchView.OnQueryTextListener textChangeListenerArtist = new SearchView.OnQueryTextListener() { 
     @Override 
     public boolean onQueryTextChange(String newText) { 
      if (!TextUtils.isEmpty(newText)) { 
       mediaFileAdapter.getFilter().filter(newText); 
      } 
      return true; 
     } 

     @Override 
     public boolean onQueryTextSubmit(String query) { 
      return true; 
     } 
    }; 

    // apply listeners to searchViews 
    searchViewTitle.setOnQueryTextListener(textChangeListenerTitle); 
    searchViewAlbum.setOnQueryTextListener(textChangeListenerAlbum); 
    searchViewArtist.setOnQueryTextListener(textChangeListenerArtist); 

    return super.onCreateOptionsMenu(menu); 

} 

@Override 
public boolean onOptionsItemSelected(MenuItem item) { 

    int id = item.getItemId(); 
    // get music from specific folder 
    if (id == R.id.folder_music) { 
     Intent intent = new Intent(this, FolderPickerActivity.class); 
     startActivityForResult(intent, PICK_FOLDER_REQUEST); 
     return true; 
    } 
    // fetch all music from device 
    if (id == R.id.all_music) { 
     PlayerController.SONGS_LIST = PlayerController.listOfSongs(getApplicationContext()); 
     initAdapter(); 

     return true; 
    } 

    // search songs by title 
    if (id == R.id.action_search_title) { 
     PlayerController.SEARCH_TYPE = "TITLE"; 

     return true; 
    } 
    // search songs by artist 
    if (id == R.id.action_search_artist) { 
     PlayerController.SEARCH_TYPE = "ARTIST"; 

     return true; 
    } 
    // search songs by album 
    if (id == R.id.action_search_album) { 
     PlayerController.SEARCH_TYPE = "ALBUM"; 

     return true; 
    } 

    if (id == R.id.action_sort_title) { 
     MediaFileComparator.sortByTitle(PlayerController.SONGS_LIST); 
     MediaFileAdapter mediaAdapter = (MediaFileAdapter) mediaListView.getAdapter(); 
     mediaAdapter.notifyDataSetChanged(); 

     return true; 
    } 
    if (id == R.id.action_sort_album) { 
     MediaFileComparator.sortByAlbum(PlayerController.SONGS_LIST); 
     MediaFileAdapter mediaAdapter = (MediaFileAdapter) mediaListView.getAdapter(); 
     mediaAdapter.notifyDataSetChanged(); 

     return true; 
    } 
    if (id == R.id.action_sort_artist) { 
     MediaFileComparator.sortByArtist(PlayerController.SONGS_LIST); 
     MediaFileAdapter mediaAdapter = (MediaFileAdapter) mediaListView.getAdapter(); 
     mediaAdapter.notifyDataSetChanged(); 

     return true; 
    } 
    if (id == R.id.action_sort_duration) { 
     MediaFileComparator.sortByDuration(PlayerController.SONGS_LIST); 
     MediaFileAdapter mediaAdapter = (MediaFileAdapter) mediaListView.getAdapter(); 
     mediaAdapter.notifyDataSetChanged(); 

     return true; 
    } 
    return super.onOptionsItemSelected(item); 
} 

@Override 
protected void onActivityResult(int requestCode, int resultCode, Intent data) { 
    super.onActivityResult(requestCode, resultCode, data); 
    if (resultCode == RESULT_OK) { 

     if (requestCode == PICK_FOLDER_REQUEST) { 

      String pickedFolder = data.getStringExtra("pickedFolder"); 
      Log.i("PICKER_FOLDER_TAG", pickedFolder); 

      // get last subfolder from path as WHERE arg 
      pickedFolder = getSelectionArg(pickedFolder); 
      Log.i("PICKER_FOLDER_WHERE_TAG", pickedFolder); 

      // reinit music list and adapter with data from specific folder 
      List<MediaFile> songsFromSpecificFolder = PlayerController.getSongsFromSpecificFolder(
        getApplicationContext(), new String[]{pickedFolder} 
      ); 
      if (songsFromSpecificFolder.size() != 0) { 
       PlayerController.SONGS_LIST = songsFromSpecificFolder; 
       PlayerController.SONG_NUMBER = 0; 
       initAdapter(); 
      } 
     } 
    } 
} 

// receive audio action from 'Complete action with' pop-up 
private void handleAudioFromOpenWithPopup() { 
    // receive Intent 
    Intent intent = getIntent(); 
    // check action 
    String action = intent.getAction(); 
    // if it's audio action view 
    if (action != null && action.equals("android.intent.action.VIEW")) { 
     // play song 
     PlayerController.playMusicFromActionPicker(this, intent.getData()); 
    } 
} 

// get last subfolder from path as WHERE arg 
private String getSelectionArg(String path) { 
    String sTag = "%"; 
    // substring last directory in path 
    String lastSubfolder = path.substring(path.lastIndexOf("/") + 1); 
    return sTag + lastSubfolder + sTag; 
} 

@Override 
public void onMediaFileChanged() { 
    changeUI(); 
} 

@Override 
public void onPlayPauseActionChanged() { 
    changeButton(); 
} 

}

J'ai essayé la recherche en ligne varios fois mais je ne comprends toujours. Merci

Answer 1

La cause racine du problème est que quelque part, que ce soit votre code ou un code que votre code utilise fait quelque chose qui est équivalent à ceci:

Object[] array = new Object[0]; 
... 
System.out.println(array[0]); 

Quelque chose a créé un tableau (d'un certain type) avec la taille ZERO, et il (ou peut-être quelque chose d'autre) essaie d'accéder au premier élément (indice zéro) de ce tableau. C'est au-delà de la fin du tableau ... et cela entraîne une exception.

---

Je ne vois pas où vous créez un tableau de longueur nulle dans votre code.

Answer 2

Pourriez-vous regarder la méthode protected void onResume()?

Je pense, vous pouvez avoir un problème dans les lignes suivantes:

Integer i[] = (Integer[]) msg.obj; 
textBufferDuration.setText(PlayerUtils.getDuration(i[0])); 
textDuration.setText(PlayerUtils.getDuration(i[1])); 
seekbar.setProgress(i[2]); 

d'abord essayer d'exécuter le programme en commentant ces lignes. Il peut arriver que, dans certains cas, votre msg.obj soit réellement un tableau dont la longueur est 0. Ensuite, vous obtiendrez java.lang.IndexOutOfBoundsException: Invalid index 0, size is 0. J'espère que cela vous aide.