Как «RE-SELECT» в TabLayout программно?

Question

TabLayout.OnTabSelectedListener имеет одну функцию обратного вызова, которая onTabReselected(TabLayout.Tab tab)

Мы можем повторно вкладку вручную, нажав на выбранную вкладку снова.

Так что мой вопрос заключается в том, как повторно выбрать вкладку программно?

Answer 1

Это, как я получил свои язычки рабочие

Разметки для вкладок:

<?xml version="1.0" encoding="utf-8"?> 
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
     xmlns:app="http://schemas.android.com/apk/res-auto" 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" 
     android:orientation="vertical" 
     android:background="#ffffff"> 

     <android.support.v7.widget.Toolbar 
      android:id="@+id/toolbar" 
      android:layout_width="match_parent" 
      android:layout_height="?attr/actionBarSize" 
      app:layout_scrollFlags="scroll|enterAlways" 
      app:layout_collapseMode="pin" 
      android:background="#000000" 
      app:titleTextColor="#ffffff" 

      app:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar" 
      app:popupTheme="@style/PopupMenuStyle"> 

      <TextView 
       android:layout_width="match_parent" 
       android:layout_height="?attr/actionBarSize" 
       android:id="@+id/textview" 
       android:textColor="@color/colorTrueWhite"/> 

     </android.support.v7.widget.Toolbar> 

     <!-- our tablayout to display tabs --> 
     <android.support.design.widget.TabLayout 
      android:id="@+id/tabLayout" 
      android:layout_width="match_parent" 
      android:layout_height="wrap_content" 
      android:background="@color/colorBlack" 
      android:minHeight="?attr/actionBarSize" 

      app:tabIndicatorColor="@color/colorTrueWhite" 
      app:tabIndicatorHeight="5dp" 
      android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"/> 

     <!-- View pager to swipe views --> 


     <android.support.v4.view.ViewPager 
      android:id="@+id/pager" 
      android:layout_width="match_parent" 
      android:layout_height="fill_parent"/> 


    </LinearLayout> 

активности с использованием этого макета:

public class Main2Activity extends AppCompatActivity implements TabLayout.OnTabSelectedListener { 

    private TabLayout tabLayout; 
    public static ViewPager viewPager; 
    public static Context ctx; 
    Pager adapter; 
    public static int expired, paid; 
    Boolean isConnection; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main2); 

     Toolbar tb = (Toolbar) findViewById(R.id.toolbar); 
     setSupportActionBar(tb); 

     TextView tv = (TextView) findViewById(R.id.textview); 

     //getSupportActionBar().setDisplayHomeAsUpEnabled(true); 


     ctx = getApplicationContext(); 


     StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build(); 
     StrictMode.setThreadPolicy(policy); 


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


     tabLayout.addTab(tabLayout.newTab().setText("title1")); 
     tabLayout.addTab(tabLayout.newTab().setText("title2")); 
     tabLayout.addTab(tabLayout.newTab().setText("title3")); 
     tabLayout.setTabGravity(TabLayout.GRAVITY_FILL); 
     tabLayout.setupWithViewPager(viewPager); 

     adapter = new Pager(getSupportFragmentManager(), tabLayout.getTabCount(), ctx); 
     viewPager.setAdapter(adapter); 


     if(some condition) 
     { 
      viewPager.setCurrentItem(2); 
     } 
     else 
     { 
      viewPager.setCurrentItem(1); 
     } 
     viewPager.setOffscreenPageLimit(2); 

     tabLayout.addOnTabSelectedListener(this); 

     ViewGroup vg = (ViewGroup) tabLayout.getChildAt(0); 
     int tabsCount = vg.getChildCount(); 
     for (int j = 0; j < tabsCount; j++) { 
      ViewGroup vgTab = (ViewGroup) vg.getChildAt(j); 
      int tabChildsCount = vgTab.getChildCount(); 
      for (int i = 0; i < tabChildsCount; i++) { 
       View tabViewChild = vgTab.getChildAt(i); 
       if (tabViewChild instanceof TextView) { 
        ((TextView) tabViewChild).setTypeface(Typeface.DEFAULT, Typeface.BOLD); 
       } 
      } 
     } 
    } 


    @Override 
    public void onTabSelected(TabLayout.Tab tab) { 
     viewPager.setCurrentItem(tab.getPosition()); 
    } 

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

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


} 

пейджера код:

public class Pager extends FragmentStatePagerAdapter 
{ 
    int tabcount; 
    Context ctx; 
    private String [] Titles = {"title1", "title2", "title3"}; 

    public Pager(FragmentManager fm, int tabcount, Context ctx) 
    { 
     super(fm); 
     this.tabcount = tabcount; 
     this.ctx = ctx; 
    } 

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

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

    @Override 
    public Fragment getItem(int position) { 

     switch (position) { 

      case 0: 
       Tab1 tab1 = new Tab1(); 
       return tab1; 

      case 1: 
       Tab2 tab2 = new Tab2(); 
       return tab2; 

      case 2: 
       Tab3 tab3 = new Tab3(); 
       return tab3; 

      default: 
       return null; 
     } 
    } 


}