Je suis en train de faire tout l'art de l'album de chansons, mais elle manifeste l'erreur d'exécution suivant

Question

public void getSongList() { 
    //retrieve song info 
    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); 
     int dataColumn = musicCursor.getColumnIndex 
       (android.provider.MediaStore.Audio.Media.DATA); 
     int artColumn=musicCursor.getColumnIndex 
       (android.provider.MediaStore.Audio.Albums.ALBUM_ART); 
     //add songs to list 
     do { 
      long thisId = musicCursor.getLong(idColumn); 
      String thisTitle = musicCursor.getString(titleColumn); 
      String thisArtist = musicCursor.getString(artistColumn); 
      String thisData = musicCursor.getString(dataColumn); 

       String thisArt = musicCursor.getString(artColumn); 
       File imgFile=new File(thisArt); 
       if(imgFile.exists()){ 
        albumArt= BitmapFactory.decodeFile(imgFile.getAbsolutePath()); 
       } 


      songList.add(new Song(thisId, thisTitle, thisArtist,thisData,albumArt)); 
     } 
     while (musicCursor.moveToNext()); 
     musicCursor.close(); 
    } 
} 

FATAL EXCEPTION: principale

Process: com.example.kishan.experimentonmusicplayer, PID: 3373 


java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.kishan.experimentonmusicplayer/com.example.kishan.experimentonmusicplayer.MainActivity}: java.lang.IllegalStateException: Couldn't read row 0, col -1 from CursorWindow. Make sure the Cursor is initialized correctly before accessing data from it. 
                          at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2584) 
                          at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2666) 
                          at android.app.ActivityThread.-wrap11(ActivityThread.java) 
                          at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1493) 
                          at android.os.Handler.dispatchMessage(Handler.java:111) 
                          at android.os.Looper.loop(Looper.java:207) 
                          at android.app.ActivityThread.main(ActivityThread.java:5769) 
                          at java.lang.reflect.Method.invoke(Native Method) 
                          at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:789) 
                          at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:679) 

Causée par: java.lang.IllegalStateException: Impossible de lire la ligne 0, col -1 à partir de CursorWindow. Assurez-vous que le curseur est initialisé correctement avant d'y accéder.

at android.database.CursorWindow.nativeGetString(Native Method) 
                         at android.database.CursorWindow.getString(CursorWindow.java:438) 
                         at android.database.AbstractWindowedCursor.getString(AbstractWindowedCursor.java:66) 
                         at android.database.CursorWrapper.getString(CursorWrapper.java:137) 
                         at com.example.kishan.experimentonmusicplayer.MainActivity.getSongList(MainActivity.java:161) 
                         at com.example.kishan.experimentonmusicplayer.MainActivity.onCreate(MainActivity.java:81) 
                         at android.app.Activity.performCreate(Activity.java:6583) 
                         at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1114) 
                         at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2531) 
                         at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2666)  
                         at android.app.ActivityThread.-wrap11(ActivityThread.java)  
                         at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1493)  
                         at android.os.Handler.dispatchMessage(Handler.java:111)  
                         at android.os.Looper.loop(Looper.java:207)  
                         at android.app.ActivityThread.main(ActivityThread.java:5769)  
                         at java.lang.reflect.Method.invoke(Native Method)  
                         at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:789)  
                         at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:679)  

Answer 1

Une question a déjà été posée concernant ce problème. Le problème se situe ici: Assurez-vous que le curseur est initialisé correctement avant d'y accéder.

Il y avait une réponse utile à ce posté sur ce lien: Android cursor error - "make sure cursor is initialized correctly before accessing data from it..."