3.2.5 Call.Java

This class uses when user selects Call without backup. In this page user can see all his contacts and his phone number. When presses to one of the contacts application will automatically call to this contact.

protected void onCreate (Bundle savedInstanceState) - it is a function of the main interface for querying

public void onClick (View v) - this function starts when you press the button Button, and if the entered information is correct, sends the information to the database and logs the user

public void onPreExecute () - this function creates a PDialog and shows until the program receives data from the Base

protected String doInBackground (String. .. args) - main function is to register

protected void onPostExecute (String file_url) - sends data to the interface

Table 6 – variables of class Call.java

Name	Type	description
jsonParser	JSONParser	To send information to the base
Submit	Button	If the information entered is correct, sends the information to the database and logs the user
Phone	String	phone number contact
name	String	phone name of contact
Reg	Button	Button registration
Login	Button	Button for login
List	ListView	List of all contacts
Pho	TextView	List of phones
url	String	URL php script
Success	Int	For validation
PDialog	ProgressDialog	Animation boot
Login	String	User login
Ok	Boolean	To verify the correct password
Ko	Boolean	To check the stored contacts

3.2.6 JSONParser.java

This class is used for connection with application and php scripts. Application gives parameters and this class converts this to comfortable json format and opens http connection. And sends information to server and receives from server.

Description of the functions and variables of the class JSONParser.java

public JSONObject makeHttpRequest(String url, String method, List<NameValuePair> params) – in JSONParser.java only one method. This method has three parametres: String url is used for getting for what address will send this information, String method is used to know method of connection Get or Post, List<NameValuePair> params is parameters to send.

Table 6 – variables of class JSONParser.java

Name	Type	description
Is	InputStream	For saving InputStream
jObj	JSONObject	For saving object of JSON
Json	String	For saving json
method	String	For knowing what kind of method
httpClient	DefaultHttpClient	For saving httpclient
httpPost	HttpPost	For saving httpPost
httpResponse	HttpResponse	For saving HttpResponse
httpClient	DefaultHttpClient	For saving DefaultHttpClient
paramString	String	All parameters
reader	BufferedReader	Reading from stream
line	String	One line of stream

In Figure - 9 you can see the class JSONParser.java for example of one class

public class JSONParser {

static InputStream is = null;

static JSONObject jObj = null;

static String json = "";

// constructor

public JSONParser() {

}

// function get json from url

// by making HTTP POST or GET mehtod

public JSONObject makeHttpRequest(String url, String method,

List<NameValuePair> params) {

// Making HTTP request

try {

// check for request method

if(method == "POST"){

// request method is POST

// defaultHttpClient

DefaultHttpClient httpClient = new DefaultHttpClient();

HttpPost httpPost = new HttpPost(url);

httpPost.setEntity(new UrlEncodedFormEntity(params));

HttpResponse httpResponse = httpClient.execute(httpPost);

HttpEntity httpEntity = httpResponse.getEntity();

is = httpEntity.getContent();

}else if(method == "GET"){

// request method is GET

DefaultHttpClient httpClient = new DefaultHttpClient();

String paramString = URLEncodedUtils.format(params, "utf-8");

url += "?" + paramString;

HttpGet httpGet = new HttpGet(url);

HttpResponse httpResponse = httpClient.execute(httpGet);

HttpEntity httpEntity = httpResponse.getEntity();

is = httpEntity.getContent();

}

} catch (UnsupportedEncodingException e) {

e.printStackTrace();

} catch (ClientProtocolException e) {

e.printStackTrace();

} catch (IOException e) {

e.printStackTrace();

}

try {

BufferedReader reader = new BufferedReader(new InputStreamReader(

is, "iso-8859-1"), 8);

StringBuilder sb = new StringBuilder();

String line = null;

line = reader.readLine();

sb.append(line + "\n");

is.close();

json = sb.toString();

} catch (Exception e) {

Log.e("Buffer Error", "Error converting result " + e.toString());

}

// try parse the string to a JSON object

try {

jObj = new JSONObject(json);

} catch (JSONException e) {

Log.e("JSON Parser", "Error parsing data " + e.toString());

}

// return JSON String

return jObj;

}

}

Figure 9 - JSONParser.java