Hi readers
This is the part two of the Android PHP connection
You can find Part 1
HERE
First we'll see the structure of the project
As you can see we have class representations for the Employee and the Loginresult they are to be used by GSON to generate the objects for us.
The Constants class contains the constants such as the URL of the Web service and the user id of the currently logged in user.
The server access class handles the interaction between the server and the Application
The classes PHPClientActivity and the EmployeeListActivity are for the activities.
In the layouts section we have 3 layouts one for the Login activity , one for the Employee list activity and the third one is for the employee list item which is shown in the list.
Now we'll see the server access class the explanation is given as inline comment
public class ServerAccess {
//Convert an inputstream to a string
public static String convertStreamToString(InputStream is)
{
BufferedReader reader = new BufferedReader(new InputStreamReader(is));
StringBuilder sb = new StringBuilder();
String line = null;
try {
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
}
catch (IOException e) {
Log.e("PHP Client","Error : "+e.getMessage());
}
finally {
try {
is.close();
} catch (IOException e1) {
Log.e("PHP Client","Error : "+e1.getMessage());
}
}
return sb.toString();
}
//Get the response form the server as an object
public Object getResponseObject(ArrayList Parameters,Class c)
{
try{
//Create a HTTP Client
HttpClient httpclient = new DefaultHttpClient();
//Create and object to Post values to the server
//The url is specified in the Constants class to increase modifiability
HttpPost httppost = new HttpPost(Constants.SERVICE_URL);
//Set the attributes to be posted as Parameters
httppost.setEntity(new UrlEncodedFormEntity(Parameters));
//Execute the post and get the response
HttpResponse response = httpclient.execute(httppost);
//Get the response as ans entity
HttpEntity entity = response.getEntity();
//Get the content of the response as a stream
InputStream stream=entity.getContent();
//Convert the stream to a GSON object
String result= convertStreamToString(stream);
//Create a GSON object
Gson gson=new Gson();
//Convert the respose string to a object of the given type
//Here Object class is used so that we can use the same method to get any
//class's object as response
Object responseObject=gson.fromJson(result, c);
//Return the object
return responseObject;
}catch(Exception e){
Log.e("PHP Client", "Error in http connection"+e.toString());
return null;
}
}
//Verify the login and return user id or 0
public int getUserID(String Username,String Password)
{
//Create an arraylist to store the parameters and values as key value pairs
ArrayList parameters=new ArrayList();
//Please make sure the spellings of the keys are correct
//Set the method name
parameters.add(new BasicNameValuePair("method","verifyLogin"));
//Set the username
parameters.add(new BasicNameValuePair("username",Username));
//Set the password
parameters.add(new BasicNameValuePair("password",Password));
//Get the result from the server using the getresponse method
LoginResult o= (LoginResult)getResponseObject(parameters,LoginResult.class);
return Integer.parseInt(o.result);
}
//Get the employees
public Employee[] getEmployees(int id)
{
//Create the arraylist to set the parameters of the post
ArrayList parameters=new ArrayList();
//Set the method name
parameters.add(new BasicNameValuePair("method","getEmployees"));
parameters.add(new BasicNameValuePair("id",String.valueOf(id)));
//Get the array of employee arrays as the result
Employee[] o= (Employee[])getResponseObject(parameters,Employee[].class);
return o;
}
}
Now we'll see the Activity class
Here i've provided the code only for the button click event
ServerAccess ss=new ServerAccess();
Constants.USER_ID=ss.getUserID(txtUsername.getText().toString(), txtPassword.getText().toString());
if(Constants.USER_ID==0)
{
Toast.makeText(getApplicationContext(), "Invalid Username or Password", Toast.LENGTH_LONG).show();
}
else
{
Intent employeeListActivity=new Intent(getApplicationContext(),EmployeesListActivity.class);
startActivity(employeeListActivity);
}
Now we'll see the code for the Listing part
public class EmployeesListActivity extends Activity {
ListView listEmployeeDetails;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.employeeslist);
listEmployeeDetails=(ListView)findViewById(R.id.listViewEmployees);
//Get the employee array from the server access class
ServerAccess ss=new ServerAccess();
Employee[] employeesArray= ss.getEmployees(Constants.USER_ID);
//Set the adapter with our custom view so that the Employee name and his/her address will be shown
listEmployeeDetails.setAdapter(new EmployeeAdapter(this, R.layout.employeeitem, employeesArray));
}
private class EmployeeAdapter extends ArrayAdapter
{
//Array to have the objects
private Employee[] array;
public EmployeeAdapter(Context context, int textViewResourceId,
Employee[] objects) {
super(context, textViewResourceId, objects);
array=objects;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
//Set the view for each item in the list view
View v = convertView;
if (v == null) {
LayoutInflater vi = (LayoutInflater)getSystemService(Context.LAYOUT_INFLATER_SERVICE);
v = vi.inflate(R.layout.employeeitem, null);
}
//Get the Textviews from the row view and set the appropriate values for them
TextView labelName=(TextView) v.findViewById(R.id.labelName);
TextView labelAddress=(TextView)v.findViewById(R.id.labelAddress);
labelName.setText(array[position].name);
labelAddress.setText(array[position].address);
return v;
}
}
}
Make sure you give the Uses internet permission in the manifest file.
App screenshots
Happy Coding
-Guruparan Giritharan-
Please leave a comment
