android webview

    public class MainActivity extends ActionBarActivity
            implements NavigationDrawerCallbacks {

        Boolean isInternetPresent = false;

        ConnectionDetector cd;

        private NavigationDrawerFragment mNavigationDrawerFragment;
        private Toolbar mToolbar;

        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
            //Accessing WebView
            findViewById(R.id.webview);

            cd = new ConnectionDetector(getApplicationContext());

            mToolbar = (Toolbar) findViewById(R.id.toolbar_actionbar);
            setSupportActionBar(mToolbar);

            mNavigationDrawerFragment = (NavigationDrawerFragment)
                    getFragmentManager().findFragmentById(R.id.fragment_drawer);

            mNavigationDrawerFragment.setup(R.id.fragment_drawer, (DrawerLayout) findViewById(R.id.drawer), mToolbar);

            isInternetPresent = cd.isConnectingToInternet();

            if (isInternetPresent) {
                ImageView NoInt=(ImageView) findViewById(R.id.NoInternet);
                NoInt.setVisibility(View.GONE);

                WebView webView = (WebView) findViewById(R.id.webview);
                WebSettings webSettings = webView.getSettings();
                webSettings.setJavaScriptEnabled(true);
                webView.setWebViewClient(new WebViewClient());
                webView.loadUrl("http://glocalkhabar.com");
            } else {
                AlertDialog.Builder alertDialog = new AlertDialog.Builder(MainActivity.this);
                alertDialog.setTitle("No Internet Connection");
                alertDialog.setMessage("You need an active internet connection to use this application. Please turn on Internet.");
                alertDialog.setIcon(R.drawable.wifi);
                alertDialog.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog,int which) {

                        finish();
                    }
                });

                alertDialog.setPositiveButton("Turn on Internet", new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int which) {
                        startActivityForResult(new Intent(Settings.ACTION_WIRELESS_SETTINGS), 0);

                    }
                });

                alertDialog.show();
            }

        }
        @Override
        public void onNavigationDrawerItemSelected(int position) {
        }

        @Override
        public void onBackPressed() {
            WebView mywebView = (WebView) findViewById(R.id.webview);
            if (mNavigationDrawerFragment.isDrawerOpen())
                mNavigationDrawerFragment.closeDrawer();
            else if (mywebView.canGoBack())
            {
                mywebView.goBack();
            }
            else
            {
                super.onBackPressed();
            }

        }


        @Override
        public boolean onCreateOptionsMenu(Menu menu) {
            if (!mNavigationDrawerFragment.isDrawerOpen()) {
                getMenuInflater().inflate(R.menu.main, menu);
                return true;
            }
            return super.onCreateOptionsMenu(menu);
        }


        @Override
        public boolean onOptionsItemSelected(MenuItem item) {
            int id = item.getItemId();

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

            return super.onOptionsItemSelected(item);
        }


    }