Android: Pass data(extras) to a fragment

Two things. First I don't think you are adding the data that you want to pass to the fragment correctly. What you need to pass to the fragment is a bundle, not an intent. For example if I wanted send an int value to a fragment I would create a bundle, put the int into that bundle, and then set that bundle as an argument to be used when the fragment was created.

Bundle bundle = new Bundle();bundle.putInt(key, value);fragment.setArguments(bundle);

Second to retrieve that information you need to get the arguments sent to the fragment. You then extract the value based on the key you identified it with. For example in your fragment:

Bundle bundle = this.getArguments();if (bundle != null) {    int i = bundle.getInt(key, defaulValue);}

What you are getting changes depending on what you put. Also the default value is usually null but does not need to be. It depends on if you set a default value for that argument.

Lastly I do not think you can do this in onCreateView. I think you must retrieve this data within your fragment's onActivityCreated method. My reasoning is as follows. onActivityCreated runs after the underlying activity has finished its own onCreate method. If you are placing the information you wish to retrieve within the bundle durring your activity's onCreate method, it will not exist during your fragment's onCreateView. Try using this in onActivityCreated and just update your ListView contents later.

I prefer Serializable = no boilerplate code. For passing data to other Fragments or Activities the speed difference to a Parcelable does not matter.

I would also always provide a helper method for a Fragment or Activity, this way you always know, what data has to be passed. Here an example for your ListMusicFragment:

private static final String EXTRA_MUSIC_LIST = "music_list";public static ListMusicFragment createInstance(List<Music> music) {    ListMusicFragment fragment = new ListMusicFragment();    Bundle bundle = new Bundle();    bundle.putSerializable(EXTRA_MUSIC_LIST, music);    fragment.setArguments(bundle);    return fragment;}@Overridepublic View onCreateView(...) {     ...    Bundle bundle = intent.getArguments();    List<Music> musicList = (List<Music>)bundle.getSerializable(EXTRA_MUSIC_LIST);    ...}

There is a simple why that I prefered to the bundle due to the no duplicate data in memory. It consists of a init public method for the fragment

private ArrayList<Music> listMusics = new ArrayList<Music>();private ListView listMusic;public static ListMusicFragment createInstance(List<Music> music) {    ListMusicFragment fragment = new ListMusicFragment();    fragment.init(music);    return fragment;}public void init(List<Music> music){    this.listMusic = music;}@Overridepublic View onCreateView(LayoutInflater inflater, ViewGroup container,     Bundle savedInstanceState){    View view = inflater.inflate(R.layout.musiclistview, container, false);    listMusic = (ListView) view.findViewById(R.id.musicListView);    listMusic.setAdapter(new MusicBaseAdapter(getActivity(), listMusics));    return view;}}

In two words, you create an instance of the fragment an by the init method (u can call it as u want) you pass the reference of your list without create a copy by serialization to the instance of the fragment. This is very usefull because if you change something in the list u will get it in the other parts of the app and ofcourse, you use less memory.