Wie Registerkarte "RE-SELECT" in TabLayout programmgesteuert?

Question

TabLayout.OnTabSelectedListener hat einen Rückruf, die onTabReselected(TabLayout.Tab tab)

Wir ist Registerkarte wieder manuell durch Antippen auf ausgewählte Registerkarte erneut auswählen können.

Also meine Frage ist, wie Registerkarte programmatisch neu zu wählen?

Answer 1

Dies ist, wie ich meine Tabs bekam

Layout für die Tabs arbeiten:

<?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> 

Aktivität mit, dass das Layout:

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) { 
    } 


} 

Pager Code:

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; 
     } 
    } 


}