LoginActivy.java

package com.projetofinal.sisodonto.view;

import com.projetofinal.sisodonto.controller.LoginController;

import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import com.projetofinal.sisodonto.view.R;

import org.json.JSONException;
import org.json.JSONObject;

import android.app.Activity;
import android.app.ProgressDialog;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

import com.loopj.android.http.AsyncHttpClient;
import com.loopj.android.http.AsyncHttpResponseHandler;
import com.loopj.android.http.RequestParams;

public class LoginActivity extends Activity implements OnClickListener{

    private Button btEntrar;
    private LoginController controller;
    private EditText etEmail;
    private EditText etSenha;
    private Context context;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_login);

        inicializarComponentes();
        inicializarController();
    }

    public void inicializarComponentes(){
        btEntrar = (Button)findViewById(R.id.btEntrar);
        btEntrar.setOnClickListener(this);

        etEmail = (EditText)findViewById(R.id.etEmail);
        etSenha = (EditText)findViewById(R.id.etSenha);
    }

    public void inicializarController(){
        this.controller = new LoginController(this);
    }

     public void invokeWS(RequestParams params){
         // Make RESTful webservice call using AsyncHttpClient object
         AsyncHttpClient client = new AsyncHttpClient();
         client.get("http://192.168.2.2:9999/useraccount/login/dologin",params ,new AsyncHttpResponseHandler() {
             // When the response returned by REST has Http response code '200'
             @Override
             public void onSuccess(String response) {
                 try {
                          // JSON Object
                         JSONObject obj = new JSONObject(response);
                         // When the JSON response has status boolean value assigned with true
                         if(obj.getBoolean("status")){
                             Toast.makeText(getApplicationContext(), "You are successfully logged in!", Toast.LENGTH_LONG).show();
                             // Navigate to Home screen
                         }
                         // Else display error message
                         else{
                             Toast.makeText(getApplicationContext(), obj.getString("error_msg"), Toast.LENGTH_LONG).show();
                         }
                 } catch (JSONException e) {
                     // TODO Auto-generated catch block
                     Toast.makeText(getApplicationContext(), "Error Occured [Server's JSON response might be invalid]!", Toast.LENGTH_LONG).show();
                     e.printStackTrace();

                 }
             }
             // When the response returned by REST has Http response code other than '200'
             @Override
             public void onFailure(int statusCode, Throwable error,
                 String content) {
                 // When Http response code is '404'
                 if(statusCode == 404){
                     Toast.makeText(getApplicationContext(), "Requested resource not found", Toast.LENGTH_LONG).show();
                 }
                 // When Http response code is '500'
                 else if(statusCode == 500){
                     Toast.makeText(getApplicationContext(), "Something went wrong at server end", Toast.LENGTH_LONG).show();
                 }
                 // When Http response code other than 404, 500
                 else{
                     Toast.makeText(getApplicationContext(), "Unexpected Error occcured! [Most common Error: Device might not be connected to Internet or remote server is not up and running]", Toast.LENGTH_LONG).show();
                 }
             }
         });
    }

    public void loginUser(View view){
        String email = etEmail.getText().toString();
        String password = etSenha.getText().toString();
        RequestParams params = new RequestParams();
         if(Utility.isNotNull(email) && Utility.isNotNull(password)){
               // When Email entered is Valid
               if(Utility.validate(email)){
                   // Put Http parameter username with value of Email Edit View control
                   params.put("username", email);
                   // Put Http parameter password with value of Password Edit Value control
                   params.put("password", password);
                   // Invoke RESTful Web Service with Http parameters
                   invokeWS(params);
               }
               // When Email is invalid
               else{
                   Toast.makeText(getApplicationContext(), "Please enter valid email", Toast.LENGTH_LONG).show();
               }
           } else{
               Toast.makeText(getApplicationContext(), "Please fill the form, don't leave any field blank", Toast.LENGTH_LONG).show();
           }

    }

     public void navigatetoTrocarSenhaActivity(){
            Intent i = new Intent(this.context, TrocarSenhaActivity.class);
            context.startActivity(i);
        }

    public void onClick(View v){
        switch(v.getId()){
        case R.id.btEntrar:
            //controller.entrar();
            this.loginUser(v);
            this.navigatetoTrocarSenhaActivity();
        }
    }

}