Android TabLayout with many tabs Kotlin
dependencies
implementation 'com.android.support:design:26.1.0'
PageFragment.kt
import android.os.Bundle import android.support.v4.app.Fragment import android.view.ViewGroup import android.view.LayoutInflater import android.view.View import android.widget.TextView class PageFragment : Fragment() { override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? { val view = inflater.inflate(R.layout.fragment_page, container, false) val page = getArguments().getInt(PAGE_NUM) val tvHello: TextView = view.findViewById(R.id.tv_hello) tvHello.text = "Fragment $page" return view } companion object { val PAGE_NUM = "PAGE_NUM" fun newInstance(page: Int): PageFragment { val fragment = PageFragment() val args = Bundle() args.putInt(PAGE_NUM, page) fragment.setArguments(args) return fragment } } }
PageAdapter.kt
import android.support.v4.app.Fragment import android.support.v4.app.FragmentManager; import android.support.v4.app.FragmentPagerAdapter class PageAdapter(fm: FragmentManager) : FragmentPagerAdapter(fm) { private val tabNames: ArrayList<String> private val fragments: ArrayList<Fragment> init { tabNames = ArrayList() fragments = ArrayList() } fun add(fragment: Fragment, title: String) { tabNames.add(title) fragments.add(fragment) } override fun getCount(): Int { return fragments.size } override fun getItem(position: Int): Fragment { return fragments[position] } override fun getPageTitle(position: Int): CharSequence { return tabNames[position] } }
MainActivity.kt
import android.support.v7.app.AppCompatActivity import android.os.Bundle import kotlinx.android.synthetic.main.activity_main.* class MainActivity : AppCompatActivity() { override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) val pageAdapter = PageAdapter(supportFragmentManager) // create fragments from 0 to 9 for (i in 0 until 10) { pageAdapter.add(PageFragment.newInstance(i), "Tab$i") } view_pager.adapter = pageAdapter tabs.setupWithViewPager(view_pager) } }
fragment_page.xml
<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent"> <TextView android:id="@+id/tv_hello" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerInParent="true" android:text="Hello" /> </RelativeLayout>
activity_main.xml
<?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" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" tools:context="com.example.tablayoutmanytabs.MainActivity"> <android.support.design.widget.TabLayout android:id="@+id/tabs" android:layout_width="match_parent" android:layout_height="wrap_content" android:background="@color/colorPrimary" app:tabTextColor="#fff" app:tabBackground="?attr/selectableItemBackground" app:tabGravity="fill" app:tabSelectedTextColor="@android:color/white" app:tabMode="scrollable" /> <android.support.v4.view.ViewPager android:id="@+id/view_pager" android:layout_width="match_parent" android:layout_height="match_parent" /> </LinearLayout>
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