当我运行我的课程时,列表视图第一次填充了一首歌曲,但从那时起我添加了歌曲,他们不会添加到列表视图中,只有第一个在那里。我认为我的活动不会在每次关闭时重新启动。这是我的更新方法:
public void updatelist() {
Cursor cursor = getContentResolver().query(MediaStore.Audio.Media.EXTERNAL_CONTENT_URI, null, null, null,null);
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);
}
这是我的破坏方法
@Override
protected void onDestroy() {
super.onDestroy();
adapter.clear();
}
感谢您的帮助。