在kotlin的片段

我卡在我的应用程序,因为我必须做一个片段,在导航抽屉kotlin ..任何人都可以帮忙吗? 我在网上搜索了很多东西,但是我还没有找到任何东西…在这里是两个项目,我已经做了主要活动,我希望在片段中也有。

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 } 

是这样的吗? @Nongthonbam Tonthoi

 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() } }