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

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)
    }
}