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Android webservices

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Transcript

  • 1. 1 Android Web Service
  • 2. Topics • HttpClient API • Invocation styles (in HttpClient API) • Response Formats
  • 3. HttpClient API
  • 4. HTTP Operations • Based on Apache HTTP package • HttpClient > Interface for an HTTP client > HTTP clients encapsulate a smorgasbord of objects required to execute HTTP requests while handling cookies, authentication, connection management, and other features > Thread safety of HTTP clients depends on the implementation and configuration of the specific client • DefaultHttpClient > Default implementation of HTTP client
  • 5. Invocation Styles in HttpClient
  • 6. Invocation Styles in HttpClient • Synchronous > public abstract HttpResponse execute (HttpUriRequest request) • Asynchronous > public abstract T execute (HttpUriRequest request, ResponseHandler<? extends T> responseHandler)
  • 7. Sending HTTP Request • HttpRequest • HttpGet > Provides HTTP Get • HttpPost > Provides HTTP Post
  • 8. Receiving HTTP Response • HttpResponse > Deals with responses in HTTP MIME type • RespondHandler interface > Handler that encapsulates the process of generating a response object from a HttpResponse • BasicResponseHandler > A ResponseHandler that returns the response body as a String for successful (2xx) responses. If the response code was >= 300, the response body is consumed and an HttpResponseException is thrown.
  • 9. Example Code - Synchronous HttpClient httpclient = new DefaultHttpClient(); // Prepare a request object HttpGet httpget = new HttpGet(url); // Execute the request HttpResponse response; try { response = httpclient.execute(httpget); // Get hold of the response entity HttpEntity entity = response.getEntity(); if (entity != null) { // A Simple JSON Response Read InputStream instream = entity.getContent(); result = convertStreamToString(instream);
  • 10. Example Code - Asynchronous HttpClient httpclient = new DefaultHttpClient(); // Prepare a request object HttpGet httpget = new HttpGet(url); try { ResponseHandler<String> mResponseHandler = new BasicResponseHandler(); result = httpclient.execute(httpget, mResponseHandler); ...
  • 11. Response Formats
  • 12. Response Formats • XML • JSON • RSS, Atom • ...
  • 13. XML Parsing • SAX • DOM • Pull-parser
  • 14. JSON Parsing • Use org.json.JSONObject class • Example JSONObject json = new JSONObject(result); // A Simple JSONObject Parsing JSONArray nameArray = json.names(); JSONArray valArray = json.toJSONArray(nameArray); // A Simple JSONObject Value Pushing json.put("sample key", "sample value"); // A simple access to the first name jsonResult = nameArray.getString(0);
  • 15. Thank you