隠すナビゲーション引き出しとAndroidの断片でのWebViewをロードタブは

Question

public class MainActivity extends AppCompatActivity implements NavigationView.OnNavigationItemSelectedListener { 
    // Remove the below line after defining your own ad unit ID. 
    /* private static final String TOAST_TEXT = "Test ads are being shown. " 
      + "To show live ads, replace the ad unit ID in res/values/strings.xml with your own ad unit ID.";*/ 

    boolean doubleBackToExitPressedOnce = false; 
    //set viewpager adapter 
    ViewPagerAdapter pagerAdapter; 
    private ViewPager viewPager; 
    private DrawerLayout drawer; 
    private TabLayout tabLayout; 
    private String[] pageTitle = {"Home","Movies","Songs", "Comedy"}; 


    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     //requestWindowFeature(Window.FEATURE_NO_TITLE); 
     getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN); 
     setContentView(R.layout.activity_main); 


     // Load an ad into the AdMob banner view. 
     AdView adView = (AdView) findViewById(R.id.adView); 
     AdRequest adRequest = new AdRequest.Builder() 
       .setRequestAgent("android_studio:ad_template").build(); 
     adView.loadAd(adRequest); 

     // Toasts the test ad message on the screen. Remove this after defining your own ad unit ID. 
     // Toast.makeText(this, TOAST_TEXT, Toast.LENGTH_LONG).show(); 

     viewPager = (ViewPager) findViewById(R.id.view_pager); 
     Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar); 
     drawer = (DrawerLayout) findViewById(R.id.drawerLayout); 
     setSupportActionBar(toolbar); 
     //create default navigation drawer toggle 
     ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(this, drawer, toolbar, 
       R.string.navigation_drawer_open, R.string.navigation_drawer_close); 
     drawer.addDrawerListener(toggle); 
     toggle.syncState(); 

     //setting Tab layout (number of Tabs = number of ViewPager pages) 
     tabLayout = (TabLayout) findViewById(R.id.tab_layout); 
     for (int i = 0; i < 4; i++) { 
      tabLayout.addTab(tabLayout.newTab().setText(pageTitle[i])); 
     } 

     //set gravity for tab bar 
     tabLayout.setTabGravity(TabLayout.GRAVITY_FILL); 

     //handling navigation view item event 
     NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view); 
     assert navigationView != null; 
     navigationView.setNavigationItemSelectedListener(this); 

     //set viewpager adapter 
     pagerAdapter = new ViewPagerAdapter(getSupportFragmentManager()); 
     viewPager.setAdapter(pagerAdapter); 

     //change Tab selection when swipe ViewPager 
     viewPager.addOnPageChangeListener(new TabLayout.TabLayoutOnPageChangeListener(tabLayout)); 


     //change ViewPager page when tab selected 

     tabLayout.setOnTabSelectedListener(new TabLayout.OnTabSelectedListener() { 


      @Override 

      public void onTabSelected(TabLayout.Tab tab) { 

       viewPager.setCurrentItem(tab.getPosition()); 

      } 


      @Override 

      public void onTabUnselected(TabLayout.Tab tab) { 


      } 


      @Override 

      public void onTabReselected(TabLayout.Tab tab) { 


      } 

     }); 

    } 






    @Override 

    public boolean onNavigationItemSelected(@NonNull MenuItem item) { 

     int id = item.getItemId(); 


     switch (id) { 

      case R.id.movies: 
       viewPager.setCurrentItem(0); 

       break; 

      case R.id.comedy: 
       viewPager.setCurrentItem(1); 

       break; 

      case R.id.songs: 
       viewPager.setCurrentItem(2); 

       break; 

      case R.id.animation: 
       Intent in = new Intent(this, Animation.class); 

       // intent.putExtra("string", ""); 

       startActivity(in); 
       break; 

      case R.id.albums: 
       Intent intent = new Intent(this, DesActivity.class); 

       // intent.putExtra("string", ""); 

       startActivity(intent); 

       break; 

     } 


     drawer.closeDrawer(GravityCompat.START); 

     return true; 

    } 


    @Override 

    public void onBackPressed() { 

     int position = viewPager.getCurrentItem(); 

     Fragment fragment = pagerAdapter.getItem(position); 

     if (fragment != null) { 

      switch (position) { 

       case 0: 
        if (((Home) fragment).hasBackPage()) return; 

        break; 

       case 1: 
        if (((MoviesActivity) fragment).hasBackPage()) return; 

        break; 
       case 2: 
        if (((SongsActivity) fragment).hasBackPage()) return; 

        break; 
       case 3: 
        if (((ComedyActivity) fragment).hasBackPage()) return; 

        break; 

      } 


      if (position == 0) { 

       if (doubleBackToExitPressedOnce) { 

        super.onBackPressed(); 

        finish(); 

        return; 

       } 

       this.doubleBackToExitPressedOnce = true; 

       Toast.makeText(this, "Touch again to Exit", Toast.LENGTH_SHORT).show(); 


       new Handler().postDelayed(new Runnable() { 


        @Override 

        public void run() { 

         doubleBackToExitPressedOnce = false; 

        } 

       }, 2000); 

      } else { 

       viewPager.setCurrentItem(0); 

      } 

     } 

    } 


} 

Answer 1

は、最初は非表示の両方TabLayoutとNavigationDrawerとWebViewは、コードの下に使用してロードされたショー

mWebView.setWebViewClient(new WebViewClient() { 
      @Override 
      public void onPageFinished(WebView view, String url) { 
       showViews(); 
      } 
     });