相关疑难解决方法(0)

如何以编程方式在TabLayout中选择选项卡？

 TabLayout tabLayout = (TabLayout) findViewById(R.id.tabs);
 tabLayout.setupWithViewPager(viewPager);

我正在以下名为FriendListActivity的屏幕上工作：

正如您在此处看到的那样，我是3个名为CHAT，GROUPS和CONTACTS的选项卡。每个选项卡都显示一些内容。例如，Groups选项卡显示了组数。单击每个Group时，将打开Group Chat屏幕.Now In Group Chat屏幕上，我有一个工具栏。请考虑以下代码：

 Toolbar toolbarGroupChat = (Toolbar) findViewById(R.id.toolbarGroupChat);
  setSupportActionBar(toolbarGroupChat);
    getSupportActionBar().setDisplayHomeAsUpEnabled(true);
    getSupportActionBar().setTitle(upperCase(group_name));


  //ViewPager
    viewPager = (ViewPager) findViewById(R.id.viewPager);
    //Initializing PagerAdapter
    PagerAdapter pagerAdapter = new PagerAdapter(getSupportFragmentManager(), tabLayout.getTabCount());
    viewPager.setAdapter(pagerAdapter);

    viewPager.addOnPageChangeListener(new TabLayout.TabLayoutOnPageChangeListener(tabLayout));
    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) {

        }
    });

PagerAdapter.java

    public class PagerAdapter extends FragmentStatePagerAdapter {
    private int noOfTabs;

    public PagerAdapter(FragmentManager fm, int noOfTabs) {
        super(fm);
        this.noOfTabs = noOfTabs;
    }

    @Override
    public Fragment …