How can i create dynamically tab with viewpager in android?

Question

Explanation:

Suppose, I have multiple categories which come from my REST. I don\'t know how many categories it\'s mat be 5,7 or sometimes 2 etc. I want

Answer 1

After you get categories size, you can add dynamic tabs as per your categories size as below:

public class MainActivity extends AppCompatActivity {

TabLayout tabLayout;
ViewPager viewPager;
Toolbar toolbar;
int no_of_categories=-1;

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

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

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

    no_of_categories=YOUR_NO_CATEGORIES;

    for (int i = 0; i < no_of_weeks; i++) {
        tabLayout.addTab(tabLayout.newTab().setText("TAB " + String.valueOf(i + 1)));
    }

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

    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) {

        }
    });


   }
}

And your Adapter Class should be like below:

public class ViewPagerAdapter extends FragmentStatePagerAdapter {

    int mNumOfTabs;
    Fragment fragment = null;

    public ViewPagerAdapter(FragmentManager fm, int NumOfTabs) {
        super(fm);
        this.mNumOfTabs = NumOfTabs;
    }

    @Override
    public Fragment getItem(int position) {

        for (int i = 0; i < mNumOfTabs ; i++) {
            if (i == position) {
                fragment = YourFragment.newInstance();
                break;
            }
        }
        return fragment;

    }

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

    @Override
    public CharSequence getPageTitle(int position) {
        return super.getPageTitle(position);
    }
}