asynchttp-usage

package com.stephel.sadix.main;

import java.io.UnsupportedEncodingException;
import java.net.URISyntaxException;
import java.text.SimpleDateFormat;
import java.util.Date;

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

import android.annotation.SuppressLint;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.pm.PackageManager.NameNotFoundException;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.EditText;
import android.widget.ImageButton;
import android.widget.TextView;
import android.widget.Toast;

import com.stephel.sadix.R;
import com.stephel.sadix.constants.ActivityType;
import com.stephel.sadix.constants.AppSettings;
import com.stephel.sadix.constants.Url;
import com.stephel.sadix.dao.LogActivity;
import com.stephel.sadix.dao.LogActivityDao;
import com.stephel.sadix.main.dialogs.AlertDialogFragment;
import com.stephel.sadix.utils.AsyncHttpRequest;
import com.stephel.sadix.utils.AsyncTaskCompleteListener;

public class LoginActivity extends FragmentActivity implements AsyncTaskCompleteListener<String>, DialogInterface.OnClickListener {
    private EditText txtPassword;
    private EditText txtUserName;
    private TextView txtVersion;
    private ImageButton btnLogin;
    private Drawable loginBtnClicked;

    private Context context;
    private App app;
    private static final String logTag = LoginActivity.class.toString();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        //initialize components
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_login);
        context = this;
        txtVersion = ((TextView) findViewById(R.id.txtVersion));
        txtUserName = ((EditText) findViewById(R.id.txtUserName));
        txtPassword = ((EditText) findViewById(R.id.txtPassword));
        //set-up view
        String version = "0";
        try {
            version = context.getPackageManager().getPackageInfo(
                    context.getPackageName(), 0).versionName;
            txtVersion.setText(version);
        } catch (NameNotFoundException e) {
            e.printStackTrace();
        }
        loginBtnClicked = context.getResources().getDrawable(R.drawable.login_btn_clicked);
        btnLogin = ((ImageButton) findViewById(R.id.btnLogin));
        initListener();
    }

    @Override
    public void onResume(){
        super.onResume();
        //TODO check if the device time synched with the server
        //TODO after sync, check if he's logged in
        initSession();
    }

    private void initSession() {
        app = (App)getApplicationContext();
        if(app.getSession().isLoggedIn()){
            launchMainActivity();
        }
    }

    private void launchMainActivity(){
        Intent mainMenuIntent = new Intent(this.getApplicationContext(),
            HomeActivity.class);
        startActivity(mainMenuIntent);
    }

    private void initListener(){
        btnLogin.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                btnLogin.setBackgroundDrawable(loginBtnClicked);
                CharSequence userName = txtUserName.getText();
                CharSequence password = txtPassword.getText();
                //TODO use GSON and dto packages!
                JSONObject jsonLogin = new JSONObject();

                try {
                    jsonLogin.put("UserName", userName);
                    jsonLogin.put("Password", password);
                    jsonLogin.put("SC", AppSettings.SILENT_CODE);
                    jsonLogin.put("AppVersion", AppSettings.APP_VERSION);
                    String request = jsonLogin.toString();
                    AsyncHttpRequest req = new AsyncHttpRequest(context,LoginActivity.this,AsyncHttpRequest.PostMethod,Url.API_POST_LOGIN,request);
                    req.ContentTypeHeader = AsyncHttpRequest.ContentTypeJSON;
                    req.AcceptHeader=AsyncHttpRequest.ContentTypeJSON;
                    //TODO make execute compatible with HONEYCOMB above to maintain concurrent call to API
                    req.execute();
                } catch (JSONException je) {
                    Log.e(logTag,"Error Creating Json : "+je.getMessage());
                } catch (URISyntaxException e) {
                    Log.e(logTag,"Invalid URI : "+e.getMessage());
                } catch (UnsupportedEncodingException e) {
                    Log.e(logTag,"Encoding unsupported : "+e.getMessage());
                }
            }
        });
    }

    @SuppressLint("SimpleDateFormat")
    @Override
    public void onTaskComplete(String result, int Tag) {
        try {
            if(result!=null){
                JSONObject json= new JSONObject(result);
                JSONObject jsonSadixException = json.getJSONObject("SadixException");
                String sdxResult = jsonSadixException.getString("Result");

                if(sdxResult.equals("OK")) {
                    JSONObject jsonSales = json.getJSONObject("Sales");
                    String salesFullName = jsonSales.get("FullName").toString();
                    int salesId = jsonSales.getInt("SalesId");
                    String serverDateTime = jsonSales.getString("ServerDateTime");
                    Log.i(logTag,"Successfully Logging in! Sales Name : "+salesFullName);

                    Date date = new Date();
                    SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss");
                    String currentDateandTime = sdf.format(date);
                    app.getSession().setLoggedIn(true, currentDateandTime, String.valueOf(salesId),
                            salesFullName,serverDateTime);

                    //check if date of device is synched with server to HH level (hence 13 chars taken into account
                    //date part (10 chars) + 'T' (1) + hour part (2))
                    if(!currentDateandTime.substring(0, 13).equals(serverDateTime.substring(0,13))){
                        AlertDialogFragment syncDialog = AlertDialogFragment.getInstance(
                                getString(R.string.dialog_title_sync_server_datetime),
                                getString(R.string.dialog_message_sync_server_datetime)+serverDateTime
                                );
                        syncDialog.show(this.getSupportFragmentManager(),"sync_confirm");
                    } else {
                        //log to database
                        LogActivityDao activityDao = app.getDaoSession().getLogActivityDao();
                        LogActivity activity = new LogActivity(null,ActivityType.LOGIN,"",date);
                        activityDao.insert(activity);
                        Log.d(logTag,"Login activity logged : "+activity.getId());
                        //go to main menu
                        launchMainActivity();
                    }

                } else {
                    String sdxResultMsg = jsonSadixException.getString("Message");
                    Log.w(logTag,"failed Logging in! "+sdxResultMsg);
                    Toast.makeText(this, "Login Failed : " + sdxResult, Toast.LENGTH_LONG).show();
                }
            }
        } catch (JSONException e) {
            Log.e(logTag,"Failed logging in : "+e.getMessage());
        }

    }

    //Handle sync time server dialog
    @Override
    public void onClick(DialogInterface dialog, int whichButton) {
        switch (whichButton){
        case    DialogInterface.BUTTON_POSITIVE:
            dialog.dismiss();
            try {
                startActivity(new Intent(
                        android.provider.Settings.ACTION_DATE_SETTINGS));
            } catch (Exception e) {
                e.printStackTrace();
            }
            break;
        case DialogInterface.BUTTON_NEGATIVE:
            dialog.dismiss();
            break;
        }

    }

}