Android Todos Part 1

Constants

public class Constants {
	public static final String kGetTodosUrl = "https://yoursubdomain.azure-mobile.net/tables/TodoItem?$filter=(complete%20eq%20false)";
	public static final String kAddTodoUrl =  "https://yoursubdomain.azure-mobile.net/tables/TodoItem";
	public static final String kUpdateTodoUrl = "https://yoursubdomain.azure-mobile.net/tables/TodoItem/";
	public static final String kMobileServiceAppId = "YourAppKey";
}

fetchTodos

private void fetchTodos(Intent intent) {
	boolean fetchFailed = false;
	JSONObject[] todos = null;//
	try {
		URL url = new URL(Constants.kGetTodosUrl);

		HttpURLConnection urlConnection = (HttpURLConnection) url
				.openConnection();
		urlConnection.setRequestMethod("GET");
		urlConnection
				.addRequestProperty("Content-Type", "application/json");
		urlConnection.addRequestProperty("ACCEPT", "application/json");
		urlConnection.addRequestProperty("X-ZUMO-APPLICATION",
				Constants.kMobileServiceAppId);

		try {
			InputStream in = new BufferedInputStream(
					urlConnection.getInputStream());
			BufferedReader bufferReader = new BufferedReader(
					new InputStreamReader(in));
			StringBuilder stringBuilderResponse = new StringBuilder();
			String line;
			while ((line = bufferReader.readLine()) != null) {
				stringBuilderResponse.append(line);
			}
			JSONArray jsonArray = new JSONArray(
					stringBuilderResponse.toString());
			todos = new JSONObject[jsonArray.length()];
			for (int i = 0; i < jsonArray.length(); i++) {
				todos[i] = jsonArray.getJSONObject(i);
			}
		} catch (Exception ex) {
			Log.e("TodosFetchService", "Error getting JSON from Server: "+ ex.getMessage());
			fetchFailed = true;
		} finally {
			urlConnection.disconnect();
		}
	} catch (Exception ex) {
		Log.e("TodosFetchService", "Error opening HTTP Connection: " + ex.getMessage());
		fetchFailed = true;
	}
	// Provided a result receiver was sent in, send a response back
	if (mReceiver != null) {
		if (fetchFailed) { 
			mReceiver.send(STATUS_ERROR, Bundle.EMPTY);
			this.stopSelf();
			mReceiver.send(STATUS_FINISHED, Bundle.EMPTY);
		} else {
			Bundle bundle = new Bundle();
			bundle.putBoolean(SERVICE_WAS_SUCCESS_KEY, true);
			bundle.putSerializable("todos", todos);
			mReceiver.send(STATUS_SUCCESS, bundle);
			this.stopSelf();
			mReceiver.send(STATUS_FINISHED, Bundle.EMPTY);
		}
	} else {
		this.stopSelf();
	}
}

onReceiveResult

@Override
public void onReceiveResult(int resultCode, Bundle resultBundle) {
	switch (resultCode) {
	case TodosFetchService.STATUS_RUNNING:
		// Don't do anything, the service is running
		break;
	case TodosFetchService.STATUS_SUCCESS:
		boolean wasSuccess = resultBundle
				.getBoolean(TodosFetchService.SERVICE_WAS_SUCCESS_KEY);
		if (wasSuccess) {
			// Success, update the ListView
			mTodos = (JSONObject[]) resultBundle.getSerializable("todos");
			showTodosInListView(mTodos);
		} else {
			// Failure, show error message
			Toast.makeText(
					getApplicationContext(),
					"There was an error fetching the URL data.  Please try again later.",
					Toast.LENGTH_LONG).show();
		}
		break;
	case TodosFetchService.STATUS_FINISHED:
		break;
	case TodosFetchService.STATUS_ERROR:
		// Error returned from service, show and error message
		Toast.makeText(
				getApplicationContext(),
				"There was an error fetching the Todo data."
						+ "Please try again later.", Toast.LENGTH_LONG)
				.show();
		break;
	}
}

ServiceResultReceiver

public class ServiceResultReceiver extends ResultReceiver {
	private Receiver mReceiver;
	 
    public ServiceResultReceiver(Handler handler) {
        super(handler);
    }
 
    public void setReceiver(Receiver receiver) {
        mReceiver = receiver;
    }
 
    public interface Receiver {
        public void onReceiveResult(int resultCode, Bundle resultBundle);
    }
 
    @Override
    protected void onReceiveResult(int resultCode, Bundle resultBundle) {
        if (mReceiver != null) {
            mReceiver.onReceiveResult(resultCode, resultBundle);
        }
    }
}

showTodosInListView

private void showTodosInListView(JSONObject[] mTodos2) {
	try {
		TreeSet<String> treeSetKeys = new TreeSet<String>();
		for (int i = 0; i < mTodos2.length; i++) {
			treeSetKeys.add(mTodos[i].getString("text"));
		}
		String[] keys = (String[]) treeSetKeys
				.toArray(new String[treeSetKeys.size()]);
		ArrayAdapter adapter = new ArrayAdapter<String>(this,
				android.R.layout.simple_list_item_1, keys);
		setListAdapter(adapter);
	} catch (Exception ex) {
		Log.e("TodoListActivity", ex.getMessage());
	}
}

startTodoFetchService

private void startTodoFetchService() {
	final Intent serviceIntent = new Intent(Intent.ACTION_SYNC, null,
			getApplicationContext(), TodosFetchService.class);
	// put the specifics for the submission service commands
	serviceIntent.putExtra(TodosFetchService.RECEIVER_KEY, mReceiver);
	serviceIntent.putExtra(TodosFetchService.COMMAND_KEY,
			TodosFetchService.PERFORM_SERVICE_ACTIVITY);
	// Start the service
	startService(serviceIntent);
}

TodoListActivity onCreate

@Override
public void onCreate(Bundle savedInstanceState) {
	super.onCreate(savedInstanceState);
	mReceiver = new ServiceResultReceiver(new Handler());
	mReceiver.setReceiver(this);
	startTodoFetchService();
}

TodoListActivity Start

public class TodoListActivity extends ListActivity implements
		ServiceResultReceiver.Receiver {

	private ServiceResultReceiver mReceiver;
	private JSONObject[] mTodos;

TodosFetchService One

public class TodosFetchService extends IntentService {
	// Status Constants
	public static final int STATUS_RUNNING = 0x1;
	public static final int STATUS_FINISHED = 0x2;
	public static final int STATUS_SUCCESS = 0x3;
	public static final int STATUS_ERROR = 0x4;
	// Command Constants
	public static final int PERFORM_SERVICE_ACTIVITY = 0x5;

	public static final String COMMAND_KEY = "service_command";
	public static final String RECEIVER_KEY = "serivce_receiver";
	public static final String SERVICE_WAS_SUCCESS_KEY = "service_was_success";

	private ResultReceiver mReceiver;

	public TodosFetchService() {
		super("TodosFetchService");
	}

	public TodosFetchService(String name) {
		super(name);
	}

	@Override
	protected void onHandleIntent(Intent intent) {
		this.mReceiver = intent.getParcelableExtra(RECEIVER_KEY);
		int command = intent.getIntExtra(COMMAND_KEY, PERFORM_SERVICE_ACTIVITY);
		if (this.mReceiver != null)
			this.mReceiver.send(STATUS_RUNNING, Bundle.EMPTY);
		switch (command) {
		case PERFORM_SERVICE_ACTIVITY:
			fetchTodos(intent);
			break;
		default:
			if (this.mReceiver != null)
				mReceiver.send(STATUS_FINISHED, Bundle.EMPTY);
		}
		this.stopSelf();
	}