Question

我有listview，我用sd卡中的歌曲填充它。当有多首歌曲时，它只会为所有歌曲添加相同的信息。所以所有的歌曲都是一样的，一切都是。

    if(cursor.moveToFirst()){
        for(int j=0;j<cursor.getCount();j++){

            int ALBUM_ID =  cursor.getInt((cursor.getColumnIndex(MediaStore.Audio.AlbumColumns.ALBUM_ID)));

            int pathcolumn = cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.DATA);

            String path1 = cursor.getString(pathcolumn);

            String album_url = null;

            Uri sArtworkUri = Uri.parse("content://media/external/audio/albumart");
            Uri uri = ContentUris.withAppendedId(sArtworkUri, ALBUM_ID);

            album_url = uri.toString();
            ContentResolver res = this.getContentResolver();
                // Album
                String album_name = cursor.getString(cursor.getColumnIndex(MediaStore.Audio.AlbumColumns.ALBUM));

                String year = cursor.getString(cursor.getColumnIndex(MediaStore.Audio.AudioColumns.YEAR));
               // String year = cursor.getString(cursor.getColumnIndex(MediaStore.Audio.AlbumColumns.NUMBER_OF_SONGS));


                // artist
                String artist_name = cursor.getString(cursor.getColumnIndex(MediaStore.Audio.ArtistColumns.ARTIST));
                // display name
                String DisplayName = cursor.getString(cursor.getColumnIndex(MediaStore.MediaColumns.DISPLAY_NAME));

                //title
                String Title = cursor.getString(cursor.getColumnIndex(MediaStore.MediaColumns.TITLE));

                songtitle.add(Title);
                artistname.add(artist_name);
                albumname.add(album_name);
                path.add(path1);

            }
            }
              adapter = new ArrayAdapter<String>(this,R.layout.song,songtitle);

                setListAdapter(adapter);


        }

Answer 1

尝试使用：

if(cursor.movetoFirst()) {

    do {

    // all your cursor accessing code

    while(cursor.moveToNest());

  adapter = new ArrayAdapter<String>(this,R.layout.song,songtitle);
  setListAdapter(adapter);

}

而不是你的for-loop

ListView两次添加相同的信息

1 个答案: