Sample async task class..sends params and gets data in json format.

justChecking.java

hualalal

LoginAsyncTask.java

  class LoginUser extends AsyncTask<String, Integer, String> {
  	HttpClient client = new DefaultHttpClient();
		JSONObject json;
		
		ArrayList<NameValuePair> params = new ArrayList<NameValuePair>();

		final static String URL = "http://www.your-url-here.com";

		@Override
		protected String doInBackground(String... params) {
			// TODO Auto-generated method stub

			try {
				json = sendJSONtoUrl();
			} catch (ClientProtocolException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			} catch (IOException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			} catch (JSONException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
			try {
				setStudentId(Integer.parseInt(json.getString("id").toString()
						.trim()));
				return json.getString("success").toString().trim();
			} catch (JSONException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
			return null;
		}

		@Override
		protected void onPostExecute(String result) {
			myPd_ring.dismiss();

			// myPd_ring.setVisibility(View.INVISIBLE);
			if (result.equals("0")) {
				// username and password do not match
				Toast.makeText(context, "Username and password do not match!!",
						Toast.LENGTH_SHORT).show();
			} else if (result.equals("1")) {
				// success
				Toast.makeText(context, "Login Successful", Toast.LENGTH_SHORT)
						.show();
				setSignedIn(1);
				Intent intent = new Intent("startScreenActivity");
				startActivity(intent);
			} else {
				Log.e("value of result: ", " shayad result is null ");
			}

		}

	}
		public JSONObject sendJSONtoUrl() throws ClientProtocolException,
			IOException, JSONException {
		HttpPost httpPost = new HttpPost(URL);
		params.add(new BasicNameValuePair("tag", "Login"));

		params.add(new BasicNameValuePair("Password", loginDetails));
		Log.v("value in params", params.toString() + "");
		try {
			httpPost.setEntity(new UrlEncodedFormEntity(params));

		} catch (UnsupportedEncodingException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}

		HttpResponse r = client.execute(httpPost);
		int status = r.getStatusLine().getStatusCode();
		if (status == 200) {
			Log.e("my", "status verified");
			HttpEntity e = r.getEntity();
			String data = EntityUtils.toString(e);
			Log.e("data", data.toString());
			JSONArray datastream1 = new JSONArray(data);

			JSONObject message = datastream1.getJSONObject(0);

			return message;

		} else {
			Log.e("-----", "in else part of sendJsontoUrl");
			return null;

		}

	}