Progress bar continua depois de Pagina web carregar

package com.libertynetworkbrasil.libertynetwork;

import android.app.ProgressDialog;
import android.content.ActivityNotFoundException;
import android.content.Intent;
import android.graphics.Bitmap;
import android.net.Uri;
import android.net.http.SslError;
import android.os.Bundle;
import android.os.Handler;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.view.KeyEvent;
import android.view.View;
import android.support.design.widget.NavigationView;
import android.support.v4.view.GravityCompat;
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.webkit.SslErrorHandler;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;

import java.util.TimerTask;

public class MainActivity extends AppCompatActivity
        implements NavigationView.OnNavigationItemSelectedListener {

    //iniciando webview
    private WebView mwebview;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);

        DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
        ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
                this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
        drawer.setDrawerListener(toggle);
        toggle.syncState();

        NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
        navigationView.setNavigationItemSelectedListener(this);

        //webview
        mwebview=(WebView)findViewById(R.id.meuwebView);
        WebSettings webSettings = mwebview.getSettings();
        webSettings.setJavaScriptEnabled(true);
        //melhorando perfomace do webview
        mwebview.getSettings().setRenderPriority(WebSettings.RenderPriority.HIGH);
        mwebview.getSettings().setCacheMode(WebSettings.LOAD_CACHE_ELSE_NETWORK);
        mwebview.getSettings().setAppCacheEnabled(true);
        mwebview.setScrollBarStyle(View.SCROLLBARS_INSIDE_OVERLAY);
        webSettings.setDomStorageEnabled(true);
        webSettings.setLayoutAlgorithm(WebSettings.LayoutAlgorithm.NARROW_COLUMNS);
        webSettings.setUseWideViewPort(true);
        webSettings.setSavePassword(true);
        webSettings.setSaveFormData(true);
        webSettings.setEnableSmoothTransition(true);

        mwebview.loadUrl("https://liberty.division.yt");
        //força abrir pagina no app
        mwebview.setWebViewClient(new MyWebviewClient());
    }

    @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.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) {
            Intent sobre = new Intent(this, sobre.class);
            startActivity(sobre);
            return true;
        }

        return super.onOptionsItemSelected(item);
    }

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

        if (id == R.id.site) {
            mwebview.loadUrl("http://libertynetworkbrasil.com");
        } else if (id == R.id.painel) {
            mwebview.loadUrl("https://liberty.division.yt/pt");

        } else if (id == R.id.pagamentos) {
            mwebview.loadUrl("https://liberty.division.yt/pt/payments");
        } else if (id == R.id.aplicativos) {
            mwebview.loadUrl("https://liberty.division.yt/pt/apps");
        } else if (id == R.id.config) {
            mwebview.loadUrl("https://liberty.division.yt/pt/settings");
        } else if (id == R.id.youtube) {
            Intent intent=null;
            try {
                intent =new Intent(Intent.ACTION_VIEW);
                intent.setPackage("com.google.android.youtube");
                intent.setData(Uri.parse("http://www.youtube.com/user/NetworkLiberty"));
                startActivity(intent);
            } catch (ActivityNotFoundException e) {
                intent = new Intent(Intent.ACTION_VIEW);
                intent.setData(Uri.parse("http://www.youtube.com/user/NetworkLiberty"));
                startActivity(intent);
            }
        }else if (id == R.id.faq) {
            mwebview.loadUrl("https://libertynetworkbrasil.freshdesk.com/support/home");
        }else if (id == R.id.email) {
            Intent send = new Intent(Intent.ACTION_SENDTO);
            String uriText = "mailto:" + Uri.encode("suporte@libertynetworkbrasil.com");
            Uri uri = Uri.parse(uriText);
            send.setData(uri);
            startActivity(Intent.createChooser(send, "Enviar email com..."));
        }

        DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
        drawer.closeDrawer(GravityCompat.START);
        return true;
    }
    boolean loadingFinished = true;
    boolean redirect = false;
    private class MyWebviewClient extends WebViewClient {
        @Override
        public void onReceivedSslError(WebView view, SslErrorHandler handler, SslError error) {
            handler.proceed(); // Ignore SSL certificate errors
        }
        @Override
        public boolean shouldOverrideUrlLoading(WebView view, String url) {
            mwebview.loadUrl(url);
            return true;
            }
        //ProgressDialogue
        ProgressDialog pd = null;
            @Override
            public void onPageStarted (WebView view, String url, Bitmap favicon){
                pd = new ProgressDialog(MainActivity.this);
                pd.setTitle("Aguarde");
                pd.setMessage("Carregando..");
                pd.show();
                super.onPageStarted(view, url, favicon);
            }

            @Override
            public void onPageFinished (WebView view, String url){
                    pd.dismiss();
                    super.onPageFinished(view, url);
            }

    }
    //voltar se apertar botao voltar
    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        if (event.getAction() == KeyEvent.ACTION_DOWN) {
            switch (keyCode) {
                case KeyEvent.KEYCODE_BACK:
                    if (mwebview.canGoBack()) {
                        mwebview.goBack();
                    } else {
                        finish();
                    }
                    return true;
            }
        }
        return super.onKeyDown(keyCode, event);
    }
    }