fragmentdialoglistview.java

public class FragmentListCommandDialog extends DialogFragment implements OnItemClickListener {
	
	public interface CommandClickListener {
		public void onCommandClick(CommandRow command);
	}
	
	/**
	 * You can found this file in the assets folder
	 */
	private static final String BC_COMMAND_LIST_FILENAME = "bccommands.json";
	
	private Debug mDebug = new Debug(FragmentListCommandDialog.class);
	
	private ListView mListView;
	private CommandAdapter mAdapter;
	private ArrayList<CommandRow> mCommands = new ArrayList<>();
	private CommandClickListener mCommandClickListener;

	@Override
	public View onCreateView(LayoutInflater inflater, ViewGroup container,
			Bundle savedInstanceState) {
		
        ViewGroup rootView = (ViewGroup) inflater.inflate(
                R.layout.test, container, false);

		initializeUi(rootView);
		
		mListView.setOnItemClickListener(this);
		
		// load the file asynchronously
		new AsyncTask<String, String, String>() {
			
			@Override
			protected String doInBackground(String... params) {
				try {
					StringBuffer contents = loadCommands();
					configureCommands(contents);
				} catch(Exception e) {
					mDebug.logToFile("Error occurred while opening '%s': %s", 
							BC_COMMAND_LIST_FILENAME,
							e.getMessage());
				}
				return null;
			}
			
			@Override
			protected void onPostExecute(String result) {
				// no need to call Adapter#notifyDataSetChanged
				mListView.setAdapter(mAdapter);
			}
		}.execute("");
        
        return rootView;
	}

	@Override
	public void onItemClick(AdapterView<?> parent, View view, int position, long id) {

		if ( mCommandClickListener != null ) {
			CommandRow command = mCommands.get(position);
			mCommandClickListener.onCommandClick(command);
		}
	}
	
	private void initializeUi(ViewGroup v) {
		mListView = (ListView) v.findViewById(R.id.category_list_view);
		mAdapter = new CommandAdapter(getActivity(), mCommands);
	}
	
	private StringBuffer loadCommands() throws IOException, JSONException {
		StringBuffer content = new StringBuffer(128);
		InputStream inputStream = getActivity()
				.getAssets()
				.open(BC_COMMAND_LIST_FILENAME);
		content.append(IO.convertStreamToString(inputStream));
		return content;
	}
	
	private void configureCommands(StringBuffer content) throws JSONException {

		JSONArray array = new JSONArray(content.toString());
		mCommands.clear();
		for(int i = 0;i < array.length(); ++i) {
			JSONObject object = array.getJSONObject(i);
			String cmdLabel = object.getString("cmdLabel");
			String cmdByte = object.getString("cmdType");
			String cmdAscii = object.getString("cmdAscii");
			String cmdParam = object.getString("cmdParam");
			CommandRow cmd = new CommandRow(
									cmdLabel,
									TypeConverter.hexStringToByte(cmdByte, 0),
									cmdAscii,
									cmdParam);
			mCommands.add(cmd);
		}
		
	}
	
	public void setOnCommandClickListener(CommandClickListener commandClickListener) {
		mCommandClickListener = commandClickListener;
	}
}