Simple Android AsyncTask

azurecamp-asynctask.java

	// execute("GET","url","Body")
	private class ApiClient extends AsyncTask<String, Void, String> {

		// This runs in other thread
		@Override
		protected String doInBackground(String... params) {

			String method = params[0];
			String url = params[1];
			String body = params[2];

			try {
				InputStream is = null;

				// Open connection
				URL urlConn = new URL(url);
				HttpURLConnection conn = (HttpURLConnection) urlConn.openConnection();

				// Set header
				conn.setRequestMethod(method);

				if(method.equalsIgnoreCase("POST")) {
					conn.setRequestProperty("Content-Type", "application/json");
				}

				conn.connect();

				// Add POST body
				if(method.equalsIgnoreCase("POST")) {
					byte[] outputBytes = body.getBytes("UTF-8");
					OutputStream os = conn.getOutputStream();
					os.write(outputBytes);
					os.close();
				}

				// Get response
				int response = conn.getResponseCode();
				Log.d(TAG, "The response is: " + response);

				is = conn.getInputStream();

				// Convert the InputStream into a string
				String contentAsString = "";
				BufferedReader buffer = new BufferedReader(new InputStreamReader(is));
				String s = "";
				while ((s = buffer.readLine()) != null) {
					contentAsString += s;
				}

				if (is != null) {
					is.close();
				}

				Log.d(TAG, "The content is: " + contentAsString);
				return contentAsString;

			} catch (IOException e) {
				return "Unable to retrieve web page. URL may be invalid.";
			}
		}

		@Override
		protected void onPreExecute() {
			setProgressBarIndeterminateVisibility(Boolean.TRUE); 
		}

		// This runs in UI thread
		@Override
		protected void onPostExecute(String result) {
			setProgressBarIndeterminateVisibility(Boolean.FALSE); 
			try {
			  
				JSONObject reader = new JSONObject(result);
        
	 			// TODO :: Parse JSON here
        
			} catch (JSONException e) {
				e.printStackTrace();
			}
		}
	}