BackgroundTask

/**
 * Created by * on 25/03/2016.
 */

public class BackgroundTask extends AsyncTask<String, Void, String> {
    String register = "http://***/register.php";
    String login = "http://***/login.php";
    Context ctx;
    Activity activity;
    AlertDialog.Builder builder;
    ProgressDialog progressDialog;

    public BackgroundTask(Context ctx){
    this.ctx = ctx;
    activity = (Activity)ctx;
    }

    @Override
    protected void onPreExecute() {
        builder = new AlertDialog.Builder(activity);
        progressDialog = new ProgressDialog(ctx);
        progressDialog.setTitle("Wait...");
        progressDialog.setMessage("Connection to server");
        progressDialog.setIndeterminate(true);
        progressDialog.setCancelable(false);
        progressDialog.show();
    }

    @Override
    protected String doInBackground(String... params) {
        String method = params[0];

        if (method.equals("register")){
            try {
                URL url = new URL(register);
                HttpURLConnection httpURLConnection = (HttpURLConnection)url.openConnection();
                httpURLConnection.setRequestMethod("POST");
                httpURLConnection.setDoOutput(true);
                httpURLConnection.setDoInput(true);
                OutputStream outputStream = httpURLConnection.getOutputStream();
                BufferedWriter bufferedWriter = new BufferedWriter(new OutputStreamWriter(outputStream, "UTF-8"));
                String mail = params[1];
                String name = params[2];
                String password = params[3];
                String data = URLEncoder.encode("mail", "UTF-8")+"="+URLEncoder.encode(mail, "UTF-8")+"&"+
                        URLEncoder.encode("name", "UTF-8")+"="+URLEncoder.encode(name, "UTF-8")+"&"+
                        URLEncoder.encode("password", "UTF-8")+"="+URLEncoder.encode(password, "UTF-8");
                bufferedWriter.write(data);
                bufferedWriter.flush();
                bufferedWriter.close();
                outputStream.close();
                InputStream inputStream = httpURLConnection.getInputStream();
                BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream));
                StringBuilder stringBuilder = new StringBuilder();
                String line = "";
                while ( (line=bufferedReader.readLine())!=null ){
                    stringBuilder.append(line+"\n");
                }
                httpURLConnection.disconnect();;
                Thread.sleep(5000);
                return  stringBuilder.toString().trim();

            } catch (MalformedURLException e) {
                e.printStackTrace();
            } catch (ProtocolException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
        else if(method.equals("login")){
            try {
                URL url = new URL(login);
                HttpURLConnection httpURLConnection = (HttpURLConnection)url.openConnection();
                httpURLConnection.setRequestMethod("POST");
                httpURLConnection.setDoOutput(true);
                httpURLConnection.setDoInput(true);
                OutputStream outputStream = httpURLConnection.getOutputStream();
                BufferedWriter bufferedWriter = new BufferedWriter(new OutputStreamWriter(outputStream, "UTF-8"));
                String mail, password;
                mail = params[1];
                password = params[2];
                String data = URLEncoder.encode("mail", "UTF-8")+"="+URLEncoder.encode(mail, "UTF-8")+"&"+
                        URLEncoder.encode("password", "UTF-8")+"="+URLEncoder.encode(password, "UTF-8");
                bufferedWriter.write(data);
                bufferedWriter.flush();
                bufferedWriter.close();
                outputStream.close();

                InputStream inputStream = httpURLConnection.getInputStream();
                BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream));
                StringBuilder stringBuilder = new StringBuilder();
                String line = "";
                while ( (line=bufferedReader.readLine())!=null ){
                    stringBuilder.append(line+"\n");

                }
                httpURLConnection.disconnect();;
                Thread.sleep(5000);
                return  stringBuilder.toString().trim();

            } catch (MalformedURLException e) {
                e.printStackTrace();
            } catch (ProtocolException e) {
                e.printStackTrace();
            } catch (UnsupportedEncodingException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }

        return null;
    }

    @Override
    protected void onProgressUpdate(Void... values) {
        super.onProgressUpdate(values);
    }

    @Override
    protected void onPostExecute(String json) {
        try {
            progressDialog.dismiss();
            JSONObject jsonObject = new JSONObject(json);
            JSONArray jsonArray =  jsonObject.getJSONArray("server_response");
            JSONObject jo = jsonArray.getJSONObject(0);
            String code = jo.getString("code");
            String message = jo.getString("message");
            if (code.equals("reg_true")){
                showDialog("Register succes", message, code);
            }
            else if (code.equals("reg_false")){
                showDialog("Register fail", message, code);
            }
            else if (code.equals("login_true")){
                Intent intent = new Intent(activity, MainActivity.class);
                intent.putExtra("message", message);
                activity.startActivity(intent);

                //activity.finish();
            }
            else if (code.equals("login_false")){
                showDialog("Login fail", message, code);
            }

        } catch (JSONException e) {
            e.printStackTrace();
        }

    }

    public void showDialog(String title, String message, String code){
        builder.setTitle(title);
        if (code.equals("reg_true") || code.equals("reg_false")){
            builder.setMessage(message);
            builder.setPositiveButton("OK", new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int which) {
                    dialog.dismiss();
                    activity.finish();
                }
            });

        }
        else if (code.equals("login_false")){
            builder.setMessage(message);
            builder.setPositiveButton("OK", new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int which) {
                    EditText mail, password;
                    mail = (EditText) activity.findViewById(R.id.lMail);
                    password = (EditText) activity.findViewById(R.id.lPassword);
                    mail.setText("");
                    password.setText("");
                    dialog.dismiss();
                }
            });

        }
        AlertDialog alertDialog = builder.create();
        alertDialog.show();

    }

}

Login

/**
 * Created by * on 25/03/2016.
 */

public class LoginActivity extends AppCompatActivity {
    EditText Mail,Password;
    Button Login;
    TextView toRegister;
    AlertDialog.Builder builder;

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

        Mail = (EditText) findViewById(R.id.lMail);
        Password = (EditText) findViewById(R.id.lPassword);
        Login = (Button) findViewById(R.id.bLogin);
        toRegister = (TextView)findViewById(R.id.toRegister);

        toRegister.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                startActivity(new Intent(LoginActivity.this, RegisterActivity.class));
            }
        });

        Login.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                if ( Mail.getText().toString().equals("") || Password.getText().toString().equals("") ){
                    builder = new AlertDialog.Builder(LoginActivity.this);
                    builder.setTitle("Attention");
                    builder.setMessage("Rempliser tout les champs");
                    builder.setPositiveButton("OK", new DialogInterface.OnClickListener() {
                        @Override
                        public void onClick(DialogInterface dialog, int which) {
                            dialog.dismiss();

                        }
                    });
                    AlertDialog alertDialog = builder.create();
                    alertDialog.show();
                }
                else{
                    BackgroundTask bt = new BackgroundTask(LoginActivity.this);
                    bt.execute("login" ,Mail.getText().toString(), Password.getText().toString() );
                }
            }
        });
    }

    @Override
    public void onBackPressed() {
        // Disable going back to the MainActivity
        moveTaskToBack(true);
    }

}

Main

public class MainActivity extends AppCompatActivity implements  View.OnClickListener{

    int request_code;

    Toolbar toolbar;
    DrawerLayout drawer;
    ActionBarDrawerToggle toggle;
    FragmentTransaction fragmentTransaction;
    NavigationView navigationView;

    UserLocalStore userLocalStore;
    TextView userName, userMail;

    TextView textView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {

        request_code=1;
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        textView = (TextView)findViewById(R.id.maintxt);
        String message = getIntent().getStringExtra("message");
        textView.setText(message);

        userLocalStore = new UserLocalStore(this);
        userName = (TextView)findViewById(R.id.userName);
        userMail = (TextView)findViewById(R.id.userMail);


        toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);
        drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
        toggle = new ActionBarDrawerToggle(
                this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
        drawer.setDrawerListener(toggle);
        toggle.syncState();
        fragmentTransaction = getSupportFragmentManager().beginTransaction();
        fragmentTransaction.add(R.id.main_container, new FirstFragment());
        fragmentTransaction.commit();
        getSupportActionBar().setTitle("Acceuil");
        navigationView = (NavigationView) findViewById(R.id.nav_view);
        navigationView.setNavigationItemSelectedListener(new NavigationView.OnNavigationItemSelectedListener() {

            @Override
            public boolean onNavigationItemSelected(MenuItem item) {

                switch (item.getItemId()) {
                    case R.id.home:
                        fragmentTransaction = getSupportFragmentManager().beginTransaction();
                        fragmentTransaction.replace(R.id.main_container, new FirstFragment());
                        fragmentTransaction.commit();
                        getSupportActionBar().setTitle("Acceuil");
                        item.setChecked(true);
                        drawer.closeDrawers();
                        break;
                    case R.id.list:
                        fragmentTransaction = getSupportFragmentManager().beginTransaction();
                        fragmentTransaction.replace(R.id.main_container, new SecondFragment());
                        fragmentTransaction.commit();
                        getSupportActionBar().setTitle("Second");
                        item.setChecked(true);
                        drawer.closeDrawers();
                        break;
                    case R.id.map:
                        fragmentTransaction = getSupportFragmentManager().beginTransaction();
                        fragmentTransaction.replace(R.id.main_container, new ThirdFragment());
                        fragmentTransaction.commit();
                        getSupportActionBar().setTitle("Third");
                        item.setChecked(true);
                        drawer.closeDrawers();
                        break;

                }
                return false;
            }
        });


        Intent intent = new Intent(this, LoginActivity.class);
        startActivity(intent);
    }


    @Override
    public void onBackPressed() {
        DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
        if (drawer.isDrawerOpen(GravityCompat.START)) {
            drawer.closeDrawer(GravityCompat.START);
        } else {
            super.onBackPressed();
        }
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            return true;
        }

        return super.onOptionsItemSelected(item);
    }

    public void Scanner(View view){
        Intent intent = new Intent(this, Scanner.class);
        startActivityForResult(intent, request_code);
    }

    public void onActivityResult(int requestCode, int resultCode, Intent data){

        if (request_code == requestCode ) {
            // Make sure the request was successful
            if (resultCode == RESULT_OK) {

                Toast.makeText(getBaseContext(), data.getData().toString(), Toast.LENGTH_LONG).show();
            }
        }
    }

    @Override
    public void onClick(View v){
        switch (v.getId()){
            case R.id.logout:
                userLocalStore.clearUserData();
                userLocalStore.setUserLoggedIn(false);
                startActivity(new Intent(this, LoginActivity.class));
                break;
        }
    }

    @Override
    protected void onStart() {
        super.onStart();
        if (authenticate()) {
            displayUserDetails();
        }
    }

    private boolean authenticate() {
        if (userLocalStore.getLoggedInUser() == null) {
            Intent intent = new Intent(this, LoginActivity.class);
            startActivity(intent);
            return false;
        }
        return true;
    }

    private void displayUserDetails() {
        User user = userLocalStore.getLoggedInUser();
        userMail.setText(user.name);
        userName.setText(user.mail);
    }


/**
    @SuppressWarnings("StatementWithEmptyBody")
    @Override
    public boolean onNavigationItemSelected(MenuItem item) {
        // Handle navigation view item clicks here.
        int id = item.getItemId();

        if (id == R.id.home) {
            fragmentTransaction = getSupportFragmentManager().beginTransaction();
            fragmentTransaction.replace(R.id.main_container,new FirstFragment());
            fragmentTransaction.commit();
            getSupportActionBar().setTitle("Acceuil");
            item.setChecked(true);
        } else if (id == R.id.list) {
            fragmentTransaction = getSupportFragmentManager().beginTransaction();
            fragmentTransaction.replace(R.id.main_container ,new SecondFragment());
            fragmentTransaction.commit();
            getSupportActionBar().setTitle("Listes");
            item.setChecked(true);
        } else if (id == R.id.map) {
            fragmentTransaction = getSupportFragmentManager().beginTransaction();
            fragmentTransaction.replace(R.id.main_container,new ThirdFragment());
            fragmentTransaction.commit();
            getSupportActionBar().setTitle("Carte");
            item.setChecked(true);
        } else if (id == R.id.product) {

        } else if (id == R.id.settings) {

        } else if (id == R.id.share) {

        }

        drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
        drawer.closeDrawers();
        return true;
    }
**/
}

Manifest

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.*.comparateurL3F1">

    <uses-permission android:name="android.permission.CAMERA" />
    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="com.google.android.providers.gsf.permission.READ_GSERVICES" />
    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.LOCATION_HARDWARE" />

    <uses-feature
        android:glEsVersion="0x00020000"
        android:required="true" />

    <permission
        android:name="com.example.permission.MAPS_RECEIVE"
        android:protectionLevel="signature" />

    <uses-permission android:name="com.example.permission.MAPS_RECEIVE" />

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme.NoActionBar">
        <meta-data
            android:name="com.google.android.gms.version"
            android:value="@integer/google_play_services_version" />
        <meta-data
            android:name="com.google.android.maps.v2.API_KEY"
            android:value="***" />

        <activity
            android:name=".MainActivity"
            android:label="@string/app_name"
            android:screenOrientation="portrait"
            android:theme="@style/AppTheme.NoActionBar">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

        <activity
            android:name=".LoginActivity"
            android:screenOrientation="portrait"
            android:theme="@style/AppTheme.Dark">
        </activity>
        <activity
            android:name=".RegisterActivity"
            android:screenOrientation="portrait"
            android:theme="@style/AppTheme.Dark">
        </activity>
        <activity
            android:name=".Scanner"
            android:theme="@style/AppTheme.NoActionBar">
        </activity>

    </application>

</manifest>