Fragment in kotlin

Question

i'm stuck in my application because i have to do a fragment with the navigation drawer in kotlin.. can anyone help? I have search a lot of things in web but i didn't find anything yet... Down here is two items that i have do in main activity and i want that is present in the fragment too.

override fun onNavigationItemSelected(item: MenuItem): Boolean {
    // Handle navigation view item clicks here.
    when (item.itemId) {
        R.id.home -> {

        }
        R.id.subjects -> {
            val intent = Intent(this, SubjectsActivity::class.java)
            startActivity(intent)
        }
    }

    drawer_layout.closeDrawer(GravityCompat.START)
    return true
}

Answer 1

i have a wikipedia project and this is code it you should know that this is a return function and end code you set true

    //here is for set the drawer option
    val actionBarDrawerToggle = ActionBarDrawerToggle(
        this,
        binding.drawerLayoutMain,
        binding.toolbarMain,
        R.string.openDrawer,
        R.string.closeDrawer
    )


    binding.drawerLayoutMain.addDrawerListener(actionBarDrawerToggle)

    //this code is for hamburger icon for drawer items
    actionBarDrawerToggle.syncState()

    //here is for navigation drawer show to user
    binding.navigationViewMain.setNavigationItemSelectedListener {

        when (it.itemId) {

            R.id.writer_menu -> {

                val intent = Intent(this, writer_activity::class.java)
                startActivity(intent)

                binding.drawerLayoutMain.closeDrawer(binding.navigationViewMain)
            }

            R.id.photographer_menu -> {

                val transaction = supportFragmentManager.beginTransaction()
                transaction.add(R.id.fragment_container_view, FragmentPhotographer())
                transaction.addToBackStack(null)
                transaction.commit()

                //item checkable is true

                binding.navigationViewMain.menu.getItem(1).isChecked = true

                binding.drawerLayoutMain.closeDrawer(binding.navigationViewMain)
            }

            R.id.video_menu -> {

                //show a snakbar to user

                Snackbar
                    .make(binding.root,"You clicked on video maker" , Snackbar.LENGTH_LONG)
                    .setAction("Ok"){
                        Toast.makeText(this, "You clicked ok of SnakBar ", Toast.LENGTH_SHORT).show()
                    }
                    .setActionTextColor(ContextCompat.getColor(this , R.color.md_theme_onPrimary))
                    .setBackgroundTint(ContextCompat.getColor(this, R.color.md_theme_primaryContainer))
                    .show()

                binding.drawerLayoutMain.closeDrawer(binding.navigationViewMain)
            }

            R.id.translator_menu -> {

                val transaction = supportFragmentManager.beginTransaction()
                transaction.add(R.id.fragment_container_view,translatorFragment())
                transaction.addToBackStack(null)
                transaction.commit()


                binding.drawerLayoutMain.closeDrawer(binding.navigationViewMain)
            }

            //---------------menu group

            R.id.wikipedia_menu -> {

                val url = "https://en.wikipedia.org/wiki/Main_Page"
                val intent = Intent(Intent.ACTION_VIEW, Uri.parse(url))
                startActivity(intent)

                binding.drawerLayoutMain.closeDrawer(binding.navigationViewMain)
            }

            R.id.wikimedia_menu -> {

                val url = "https://www.wikimedia.org/"
                val intent = Intent(Intent.ACTION_VIEW, Uri.parse(url))
                startActivity(intent)


                binding.drawerLayoutMain.closeDrawer(binding.navigationViewMain)
            }


        }



        true

    }

Answer 2

You can use this to replace your frame with HomeFragment() mainDisplayFrame should be replace by your FrameID

var fragmentTransaction = supportFragmentManager.beginTransaction()
fragmentTransaction.replace(R.id.mainDisplayFrame,HomeFragment()).commit()
mDrawerLayout!!.closeDrawers()

Answer 3

You can download the source link from here(Navigation Drawer In Android Kotlin)

MainActivity.kt:

class MainActivity : AppCompatActivity(), View.OnClickListener {


    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        init()
    }

    private fun init() {
        tv_home.setText("Home Tab")
        tv_title.setText("Home")
        ll_about.setOnClickListener(this)
        ll_home.setOnClickListener(this)
        ll_bookmark.setOnClickListener(this)
        ll_help.setOnClickListener(this)
        rl_menu.setOnClickListener(this)
        rl_header.setOnClickListener(this)

        tv_link.setLinkTextColor(Color.parseColor("#000000"));
        Linkify.addLinks(tv_link, Linkify.ALL)

    }

    override fun onBackPressed() {
        if (drawer_layout.isDrawerOpen(GravityCompat.START)) {
            drawer_layout.closeDrawer(GravityCompat.START)
        } else {
            super.onBackPressed()
        }
    }


    override fun onClick(p0: View?) {
        when (p0?.id) {

            R.id.ll_home -> {
                drawer_layout.closeDrawer(GravityCompat.START)
                tv_home.setText("Home Tab")
                tv_title.setText("Home")


            }
            R.id.ll_about -> {

                val browserIntent = Intent(Intent.ACTION_VIEW, Uri.parse("http://deepshikhapuri.blogspot.in/"))
                startActivity(browserIntent)

            }

            R.id.ll_help -> {
                drawer_layout.closeDrawer(GravityCompat.START)
                tv_home.setText("Help Tab")
                tv_title.setText("Help")

            }

            R.id.ll_bookmark -> {
                drawer_layout.closeDrawer(GravityCompat.START)
                tv_home.setText("Bookmark Tab")
                tv_title.setText("Bookmark")

            }

            R.id.rl_header -> {
            }

            R.id.rl_menu -> {
                if (drawer_layout.isDrawerOpen(GravityCompat.START)) {
                    drawer_layout.closeDrawer(GravityCompat.START)
                } else {
                    drawer_layout.openDrawer(GravityCompat.START)
                }
            }


        }

    }

Thanks!

Answer 4

Is something like this? @NongthonbamTonthoi

class NavViewFragment : AppCompatActivity(), 
NavigationView.OnNavigationItemSelectedListener {

fun AppCompatActivity.addFragment(fragment: Fragment, frameId: Int){
    supportFragmentManager.inTransaction { add(frameId, fragment) }
}



override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setContentView(R.layout.activity_nav_view_fragment)
    setSupportActionBar(toolbar)

    nav_view.setNavigationItemSelectedListener(this)
}

override fun onBackPressed() {
    if (drawer_layout.isDrawerOpen(GravityCompat.START)) {
        drawer_layout.closeDrawer(GravityCompat.START)
    } else {
        super.onBackPressed()
    }
}

override fun onCreateOptionsMenu(menu: Menu): Boolean {
    // Inflate the menu; this adds items to the action bar if it is present.
    menuInflater.inflate(R.menu.nav_view, menu)
    return true
}

override fun onOptionsItemSelected(item: MenuItem): Boolean {
    // Handle action bar item clicks here. The action bar will
    // automatically handle clicks on the Home/Up button, so long
    // as you specify a parent activity in AndroidManifest.xml.
    when (item.itemId) {
        R.id.action_settings -> return true
        else -> return super.onOptionsItemSelected(item)
    }
}

override fun onNavigationItemSelected(item: MenuItem): Boolean {
    // Handle navigation view item clicks here.
    when (item.itemId) {
        R.id.home -> {

        }
        R.id.subjects -> {
            val intent = Intent(this, SubjectsActivity::class.java)
            startActivity(intent)
        }

        }
    drawer_layout.closeDrawer(GravityCompat.START)
    return true
    }
inline fun FragmentManager.inTransaction(func: FragmentTransaction.() -> Unit) {
    val fragmentTransaction = beginTransaction()
    fragmentTransaction.func()
    fragmentTransaction.commit()
}

}