使用ViewPager后TabItem图标消失

Question

我的TabLayout是完美的，显示图标，然后我不得不添加一个ViewPagerOnTabSelectedListener，并且我的图标丢失。
有人可以帮我吗？

我试图解决方案，如在我的MainActivity加入这一点，但什么都没有改变：

tabLayout.getTabAt(0).setIcon(R.drawable.home); 

这是我的代码：

public class MainActivity extends AppCompatActivity { 

    private ViewPager pager; 
    private BottomNavigationView navigation; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 
     pager = (ViewPager) findViewById(R.id.pager); 
     navigation = (BottomNavigationView) findViewById(R.id.navigation); 
     BottomNavigationViewHelper.disableShiftMode(navigation); 

     TabLayout tabLayout = new TabLayout(this); 
     tabLayout = (TabLayout) findViewById(R.id.toolbar); 

     tabLayout.setupWithViewPager(pager); 

     tabLayout.addOnTabSelectedListener(
       new TabLayout.ViewPagerOnTabSelectedListener(pager) { 
        @Override 
        public void onTabSelected(TabLayout.Tab tab) { 
         super.onTabSelected(tab); 
         pager.setCurrentItem(tab.getPosition()); 
         Log.i("TAG", "onTabSelected: " + tab.getPosition()); 

        } 
        @Override 
        public void onTabUnselected(TabLayout.Tab tab) { 

        } 

        @Override 
        public void onTabReselected(TabLayout.Tab tab) { 

        } 
       }); 

     final PagerAdapter mAdapter = new MainPagerAdapter(getSupportFragmentManager()); 
     pager.setAdapter(mAdapter); 

     navigation.setOnNavigationItemSelectedListener(new BottomNavigationView.OnNavigationItemSelectedListener() { 

      @Override 
      public boolean onNavigationItemSelected(@NonNull MenuItem item) { 
       switch (item.getItemId()) { 
        case R.id.navigation_adresse: 
         pager.setCurrentItem(0); 
         return true; 
        case R.id.navigation_cognitif: 
         pager.setCurrentItem(1); 
         return true; 
        case R.id.navigation_deplacement: 
         pager.setCurrentItem(2); 
         return true; 
        case R.id.navigation_yeux: 
         pager.setCurrentItem(3); 
         return true; 
       } 
       return false; 
      } 

     }); 
    } 

    class MainPagerAdapter extends FragmentPagerAdapter { 

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

     @Override 
     public Fragment getItem(int position) { 
      switch (position) { 
       case 0: 
        return new MeFragment(); 
       case 1: 
        return new MeFragment(); 
       case 2: 
        return new MeFragment(); 
       case 3: 
       default: 
        return new MeFragment(); 
      } 
     } 
     @Override 
     public int getCount() { 
      return 4; 
     } 
    } 

Layout.xml

<?xml version="1.0" encoding="utf-8"?> 
<android.support.design.widget.CoordinatorLayout 
    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:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:fitsSystemWindows="true" 
    tools:context="com.blabla.bloublou.MainActivity" 
    > 

    <RelativeLayout 
     android:layout_width="match_parent" 
     android:layout_height="match_parent"> 

     <android.support.design.widget.TabLayout 
      android:id="@+id/toolbar" 
      android:layout_width="match_parent" 
      android:layout_height="wrap_content" 
      android:layout_gravity="top" 
      android:background="?attr/colorPrimary"> 

      <android.support.design.widget.TabItem 
       android:id="@+id/home_button" 
       android:icon="@drawable/home" 
       android:title="home"/> 

      <android.support.design.widget.TabItem 
       android:id="@+id/me_button" 
       android:icon="@drawable/me" 
       android:title="moi" /> 

      <android.support.design.widget.TabItem 
       android:id="@+id/configuration_button" 
       android:icon="@drawable/tools" 
       android:title="configuration" 
       /> 

      <android.support.design.widget.TabItem 
       android:id="@+id/help_button" 
       android:icon="@drawable/help" 
       android:title="aide"/> 

    </android.support.design.widget.TabLayout> 

    <android.support.design.widget.BottomNavigationView 
     android:id="@+id/navigation" 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" 
     android:layout_alignParentBottom="true" 
     android:layout_gravity="bottom" 
     android:background="@color/colorPrimary" 
     app:itemIconTint="@color/icon" 
     app:itemTextColor="@color/icon" 
     app:menu="@menu/navigation"> 
    </android.support.design.widget.BottomNavigationView> 

     <com.umanit.emfsc.NonSwipeableViewPager 
      android:id="@+id/pager" 
      android:layout_width="match_parent" 
      android:layout_height="wrap_content" 
      android:layout_above="@+id/navigation" 
      android:layout_below="@+id/toolbar" 
      /> 

     <include layout="@layout/content_main" 
     android:layout_width="match_parent" 
     android:layout_height="match_parent" 
     android:layout_below="@id/toolbar" 
     android:layout_above="@id/navigation" 
     /> 

    </RelativeLayout> 

</android.support.design.widget.CoordinatorLayout> 

Answer 1

 tabLayout.setupWithViewPager(pager); 

      tabLayout.addOnTabSelectedListener(
        new TabLayout.ViewPagerOnTabSelectedListener(pager) { 
         @Override 
         public void onTabSelected(TabLayout.Tab tab) { 
          super.onTabSelected(tab); 
          pager.setCurrentItem(tab.getPosition()); 
          Log.i("TAG", "onTabSelected: " + tab.getPosition()); 

         } 
         @Override 
         public void onTabUnselected(TabLayout.Tab tab) { 

         } 

         @Override 
         public void onTabReselected(TabLayout.Tab tab) { 

         } 
        }); 

      final PagerAdapter mAdapter = new MainPagerAdapter(getSupportFragmentManager()); 
      pager.setAdapter(mAdapter); 
    tabLayout.setupWithViewPager(pager); 

作出以上更改，问题我如果您在寻呼机设置了适配器之前设置了viewpager，请告诉我这是否无效。