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);
    }
}

Answer 2

if I were you I would try something like this:

its not a perfect solution just an idea of how you can do it, you would need to further modify it.

Create number of fagments = total number of categeries and name them like fragment0, fragment1 so on to the total number of categeries.

and then get the number of categeries first lets say

int count = number of categeries;

and then add fragments to ViewPager like this

ViewPagerAdapter adapter = new ViewPagerAdapter(getSupportFragmentManager());
    for(int i=0; i <= count; i++){
        adapter.addFragment(new Fragment(i)(), "ONE");
        viewPager.setAdapter(adapter);
    }
}

and to name the fragments i.e tab title you can make list of fragment titles, something like this

private final String[] title = {"One", "Two","Three"};

ViewPagerAdapter adapter = new ViewPagerAdapter(getSupportFragmentManager());
        for(int i=0; i < count; i++){
            adapter.addFragment(new Fragment(i)(), title[i]);
            viewPager.setAdapter(adapter);
        }
    }

I hope it helps

Answer 3

For Kotlin

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

class CategoryActivity : AppCompatActivity() {

    lateinit var binding: ActivityCategoryBinding
    var numberOfCat: Int? = -1


    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        binding = DataBindingUtil.setContentView(this,R.layout.activity_category)

        numberOfCat = 10
        for (i in 0..numberOfCat!!){
            tabs_main.addTab(tabs_main.newTab().setText("Hello Fragment"))
        }
        var pagerViewAdapter = CategoryViewPagerAdapter(supportFragmentManager,tabs_main.tabCount,str)
        viewpager_main.adapter = pagerViewAdapter
        viewpager_main.adapter = pagerViewAdapter

        tabs_main.addOnTabSelectedListener(object: TabLayout.OnTabSelectedListener{
            override fun onTabReselected(p0: TabLayout.Tab?) {

            }

            override fun onTabSelected(p0: TabLayout.Tab?) {
                viewpager_main.currentItem = p0!!.position
            }

            override fun onTabUnselected(p0: TabLayout.Tab?) {

            }
        })

    }
}

And here is your adapter class:

class CategoryViewPagerAdapter(fm: FragmentManager, numberOfTabs: Int, title: String): FragmentPagerAdapter(fm) {

    var fragment: Fragment? = null
    var noOfTabs: Int = numberOfTabs
    var title: String = title

    override fun getItem(position: Int): Fragment {
        for (i in 0..noOfTabs){
            if (i == position){
                fragment = CommonFragmentForCategory.newInstance(title = title)
                break
            }
        }
        return fragment!!
    }

    override fun getCount(): Int {
        return noOfTabs
    }

    override fun getPageTitle(position: Int): CharSequence? {
        return super.getPageTitle(position)
    }
}

Answer 4

if you want to dynamic tablayout and viewpager you can use this below code for a kotlin;

  for (i in 0 until tabLayout.size) {
        tabLayout.addTab(tabLayout.newTab().setText(tablayoutNameHere))
    }

This area if you want non scrollable you can handle use it;

    var tabLayoutConfig = Runnable {
        if (tabLayoutPrivilege.width < resources.displayMetrics.widthPixels) {
            tabLayoutPrivilege.tabMode = TabLayout.MODE_FIXED
            val mParams = tabLayoutPrivilege.layoutParams
            mParams.width = ViewGroup.LayoutParams.MATCH_PARENT
            tabLayoutPrivilege.layoutParams = mParams
        } else {
            tabLayoutPrivilege.tabMode = TabLayout.MODE_SCROLLABLE
        }
    }

    tabLayoutPrivilege.post(tabLayoutConfig)




val dynamicPrivilegeFragmentAdapter = DynamicPrivilegeFragmentAdapter(supportFragmentManager, tabCount,yourListHere)
        vpPrivilege.adapter = dynamicPrivilegeFragmentAdapter