mainactivity merchant

import android.content.Intent;
import android.content.res.TypedArray;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentTransaction;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBarDrawerToggle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ListView;

import com.google.android.gms.gcm.GoogleCloudMessaging;
import com.validate.R;

import java.io.IOException;
import java.util.ArrayList;

import validate.com.Charts.BarChartFrag;
import validate.com.WebService_API.API;
import validate.com.merchant.Dashboard_fragment;
import validate.com.merchant.Feedback_fragment;
import validate.com.merchant.Main_Home_fragment;
import validate.com.merchant.Payment_fragment;
import validate.com.merchant.validate_fragment;
import validate.com.slidemenu.NavigationAdapter;
import validate.com.slidemenu.nav_item_class;


public class MainActivity extends AppCompatActivity implements AdapterView.OnItemClickListener {

    private DrawerLayout mDrawerLayout;
    private ListView navList;
    private TypedArray nav_icons;
    private ArrayList<nav_item_class> nav_items;
    private String[] nav_titles;
    private NavigationAdapter navAdapter;
    private ActionBarDrawerToggle mDrawerToggle;
    Toolbar toolbar;

    GoogleCloudMessaging gcm;
    String RegId;
    public static final String PROJECT_NUMBER = "613644132796";
    private API _Api;


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

        //RegisterGCm();
        _Api = new API(this);
        toolbar = (Toolbar) findViewById(R.id.my_toolbar);
        toolbar.setNavigationIcon(R.drawable.ic_drawer);
        setSupportActionBar(toolbar);
        getSupportActionBar().setHomeButtonEnabled(true);
        getSupportActionBar().setDisplayHomeAsUpEnabled(true);
        mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
        mDrawerToggle = new ActionBarDrawerToggle(this, mDrawerLayout, toolbar
                , R.string.drawer_open, R.string.drawer_close);


        navList = (ListView) findViewById(R.id.navlist);
        nav_icons = getResources().obtainTypedArray(R.array.nav_icons);
        nav_titles = getResources().getStringArray(R.array.nav_itmes);

        View header = getLayoutInflater().inflate(R.layout.header, null);
        navList.addHeaderView(header);

        nav_items = new ArrayList<nav_item_class>();
        for(int i=0 ; i<nav_titles.length ;i++){
            nav_items.add(new nav_item_class(nav_titles[i], nav_icons.getResourceId(i, -1)));
        }

        navAdapter = new NavigationAdapter(this, nav_items);
        navList.setOnItemClickListener(this);
        navList.setAdapter(navAdapter);
        if (savedInstanceState == null) {
            displayFragment(1);
        }


    }

    @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 displayFragment(int display) {
        Fragment fragment = null;
        switch (display) {
            case 1:
                fragment = new Main_Home_fragment();
                break;
            case 2:
                fragment = new Dashboard_fragment();
                break;
            case 3:
                fragment = new BarChartFrag();
                break;
            case 4:
                fragment = new Payment_fragment();
                break;
            case 5:
                fragment = new validate_fragment();
                break;
            case 6:
                fragment = new Feedback_fragment();
                break;
            case 7:
              SignOut();
                break;


        }
        if (fragment != null) {

            FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
            ft.replace(R.id.content_frame, fragment);
            ft.commit();

            setTitle(nav_titles[display - 1]);

            mDrawerLayout.closeDrawer(navList);

        }


    }

    private void SignOut() {

        if(_Api == null){
            _Api = new API(this);
        }

        _Api.clear_setting();
        Intent intent = new Intent(MainActivity.this , LoginActivity.class);
        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TOP);
        startActivity(intent);
        finish();
    }


    @Override
    public void onItemClick(AdapterView<?> parent, View view, int position, long id) {

        displayFragment(position);

    }

    public void RegisterGCm() {
        new AsyncTask<Void, Void , Void>() {

            @Override
            protected Void doInBackground(Void... params) {
                String msg = "";

                if (gcm == null) {
                    gcm = GoogleCloudMessaging.getInstance(getApplicationContext());
                }
                try {
                    RegId = gcm.register(PROJECT_NUMBER);
                    msg = "register id" + RegId;
                } catch (IOException e) {
                    e.printStackTrace();
                    msg = e.toString();
                }

                return null;
            }


        }.execute(null,null,null);

    }





}