ナビゲーションのクリックでタブページを表示するにはどうすればいいですか？

Question

私のアプリには3つの断片があります。私はそれらをタブで正常に示しました。今、私はtab1の断片を、1つのナビゲーションドローワの項目に表示し、残りは同じです。しかし、重複の問題があります。私はこの問題を取り除くために？

MainActivity.java

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

    ViewPager viewPager = (ViewPager) findViewById(R.id.pager); 

    // Set the ViewPagerAdapter into ViewPager 
    viewPager.setAdapter(new ViewPagerAdapter(getSupportFragmentManager())); 

    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); 
} 

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




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

    if (id == R.id.nav_camera) { 
     fragmentOne f1 = new fragmentOne(); 
     fragmentTransaction.replace(R.id.fragment_container,f1); 
     fragmentTransaction.addToBackStack(null); 
     fragmentTransaction.commit(); 
     getSupportActionBar().setTitle("Camera"); 

    } else if (id == R.id.nav_gallery) { 
     fragmentTwo f2 = new fragmentTwo(); 
     fragmentTransaction.replace(R.id.fragment_container,f2); 
     fragmentTransaction.addToBackStack(null); 
     fragmentTransaction.commit(); 
     getSupportActionBar().setTitle("Gallery"); 

    } else if (id == R.id.nav_slideshow) { 
    MenuFragment f3 = new MenuFragment(); 
     fragmentTransaction.replace(R.id.fragment_container,f3); 
     fragmentTransaction.addToBackStack(null); 
     fragmentTransaction.commit(); 
     getSupportActionBar().setTitle("List"); 

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

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

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

    } 

    DrawerLayout drawer = (DrawerLayout)  
    findViewById(R.id.drawer_layout); 
    drawer.closeDrawer(GravityCompat.START); 
    return true; 
} 
} 

FragmentOne.java

public class fragmentOne extends Fragment { 
TextView t1; 
public fragmentOne(){ 

} 
@Override 
public View onCreateView(LayoutInflater inflater, ViewGroup container, 
         Bundle savedInstanceState) { 
    // TODO Auto-generated method stub 

    return inflater.inflate(R.layout.fragment_one_layout,container, false); 
} 
} 

ViewPagerAdapter.java

public class ViewPagerAdapter extends FragmentPagerAdapter { 

final int PAGE_COUNT = 3; 
// Tab Titles 
private String tabtitles[] = new String[] { "Tab1", "Tab2", "Tab3" }; 
Context context; 

public ViewPagerAdapter(FragmentManager fm) { 
    super(fm); 
} 

@Override 
public int getCount() { 
    return PAGE_COUNT; 
} 

@Override 
public Fragment getItem(int position) { 
    switch (position) { 

     // Open FragmentTab1.java 
     case 0: 
      fragmentOne fragmenttab1 = new fragmentOne(); 
      return fragmenttab1; 

     // Open FragmentTab2.java 
     case 1: 
      fragmentTwo fragmenttab2 = new fragmentTwo(); 
      return fragmenttab2; 

     // Open FragmentTab3.java 
     case 2: 
      MenuFragment fragmenttab3 = new MenuFragment(); 
      return fragmenttab3; 
    } 
    return null; 
} 

@Override 
public CharSequence getPageTitle(int position) { 
    return tabtitles[position]; 
} 
} 

MainActivity.xml

<?xml version="1.0" encoding="utf-8"?> 
<RelativeLayout xmlns:android= 
"http://schemas.android.com/apk/res/android" 
xmlns:app="http://schemas.android.com/apk/res-auto" 
xmlns:tools="http://schemas.android.com/tools" 
android:id="@+id/content_main" 
android:layout_width="match_parent" 
android:layout_height="match_parent" 
android:paddingBottom="@dimen/activity_vertical_margin" 
android:paddingLeft="@dimen/activity_horizontal_margin" 
android:paddingRight="@dimen/activity_horizontal_margin" 
android:paddingTop="@dimen/activity_vertical_margin" 
app:layout_behavior="@string/appbar_scrolling_view_behavior" 
tools:context="com.example.chaitanya.navbar.MainActivity" 
tools:showIn="@layout/app_bar_main"> 
<android.support.v4.view.ViewPager xmlns:android="http://schemas.android.com/apk/res/android" 
    android:id="@+id/pager" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" > 

    <android.support.v4.view.PagerTabStrip 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" 
     android:layout_gravity="top" 
     android:paddingBottom="10dp" 
     android:paddingTop="10dp" 
     android:textColor="#000000" /> 

</android.support.v4.view.ViewPager> 

<RelativeLayout 

    android:id="@+id/fragment_container" 
    android:layout_width="match_parent" 
    android:layout_height="wrap_content" 
    android:gravity="center|center_horizontal" 
    ></RelativeLayout> 

Answer 1

FragmentTransactionを使用する理由はありますか？あなたは（0または1または2または...）を渡す引数はあなたがNavigationViewでクリックしたアクションに基づいています

viewPager.setCurrentItem(0); 

を呼び出すことができます。 ViewPagerが変更されると、タブが自動的に更新されます。