Google Android - это несложно

Код: Выделить всё

	private ListView lvFolders;
	private File file;
	private List<String> myList;

	@Override
	public View onCreateView(LayoutInflater inflater, ViewGroup container,
			Bundle savedInstanceState) {

		View v = inflater.inflate(R.layout.folder, null);
		lvFolders = (ListView) v.findViewById(R.id.lvFolders);

		myList = new ArrayList<String>();

		String root_sd = Environment.getExternalStorageDirectory().toString();
		file = new File(root_sd);
		addToSongs(file);

		/*File list[] = file.listFiles();
		for (int i = 0; i < list.length; i++) {
			myList.add(list[i].getName());
		}*/

		lvFolders.setAdapter(new ArrayAdapter<String>(getActivity(),
				android.R.layout.simple_list_item_1, myList));

		lvFolders.setOnItemClickListener(new OnItemClickListener() {

			@Override
			public void onItemClick(AdapterView<?> arg0, View arg1,
					int position, long arg3) {
				File temp_file = new File(file, myList.get(position));

				if (!temp_file.isFile()) {
					file = new File(file, myList.get(position));
					File list[] = file.listFiles();

					myList.clear();

					for (int i = 0; i < list.length; i++) {
						myList.add(list[i].getName());
					}
					Toast.makeText(getActivity(), file.toString(),
							Toast.LENGTH_LONG).show();
					lvFolders.setAdapter(new ArrayAdapter<String>(
							getActivity(), android.R.layout.simple_list_item_1,
							myList));
				}
			}
		});

		return v;

	}

	FilenameFilter textFilter = new FilenameFilter() {
		public boolean accept(File dir, String name) {
			return (name.endsWith(".mp3"));
		}
	};

	private void addToSongs(File home) {
		for (File file : home.listFiles(textFilter)) {
			if (file.isDirectory()) {
				addToSongs(file);
			} else {
				myList.add(file.getName());
			}
		}
	}

Код: Выделить всё

rivate ListView lvFolders;
	private File file;
	private List<File> myList;

	String currentpath = Environment.getExternalStorageDirectory().toString();
	DirectoryItemAdapter adapter;
	private String ext = ".mp3";

	protected void showDir(String path) {
		File dir = new File(path);

		// adapter.clear();

		File[] files = dir.listFiles();

		if (files != null) {
			for (File f : files)
				if (f.isDirectory()) {
					Log.d("Files", f.getName());
					adapter.add(f.getName());
				}
		}

		FilenameFilter fnf = new FilenameFilter() {

			public boolean accept(File dir, String filename) {
				return filename.endsWith(ext);
			}
		};

		File[] filteredFiles = dir.listFiles(fnf);
		if (filteredFiles != null) {
			for (File f : filteredFiles)
				if (!f.isDirectory())
					adapter.add(f);
		}

		adapter.sort(new Comparator<File>() {

			public int compare(File a, File b) {
				if (a.isDirectory() == b.isDirectory())
					return a.getName().toLowerCase()
							.compareTo(b.getName().toLowerCase());
				else
					return a.isDirectory() ? -1 : 1;
			}
		});

		if (dir.getParentFile() != null)
			adapter.insert(new File(".."), 0);

		adapter.notifyDataSetChanged();

		currentpath = path;
	}

	@Override
	public View onCreateView(LayoutInflater inflater, ViewGroup container,
			Bundle savedInstanceState) {

		View v = inflater.inflate(R.layout.folder, null);
		lvFolders = (ListView) v.findViewById(R.id.lvFolders);

		myList = new ArrayList<File>();

		file = new File(currentpath);

		showDir(currentpath);

		lvFolders.setAdapter(new DirectoryItemAdapter(getActivity(),
				android.R.layout.simple_list_item_1, myList));

		lvFolders.setOnItemClickListener(new OnItemClickListener() {

			@Override
			public void onItemClick(AdapterView<?> arg0, View arg1,
					int position, long arg3) {
				lvFolders.setOnItemClickListener(new OnItemClickListener() {

					public void onItemClick(AdapterView<?> a, View view,
							int position, long arg3) {

						File f = adapter.getItem(position);
						// selectedFile = f;

						if (f.getName().equals(".."))
							showDir((new File(currentpath)).getParentFile()
									.getPath());
						else if (f.isDirectory())
							showDir(f.getPath());
						else {
							// ваши действия над файлом
						}
					}
				});
			}
		});

		return v;

	}

Код: Выделить всё

import java.io.File;
import java.util.List;

import android.content.Context;
import android.widget.ArrayAdapter;

public class DirectoryItemAdapter extends ArrayAdapter<File> {

	public DirectoryItemAdapter(Context context, int textViewResourceId,
			List<File> objects) {
		super(context, textViewResourceId, objects);
	}

	public void add(String name) {

	}

}