如何为NavigationDrawerActivity的片段中的按钮设置SetOnClickListener？ 在Kotlin

大家好，我做了一个抽屉活动，但在我的片段，我想要一个按钮所以，当我按下按钮，这应该改变文本到嗨或你好，但我不在代码应该存在的地方，当我尝试在FirstFragemt中添加代码。 KT文件，它会抛出一个错误，请帮助我，谢谢

这是我的主要活动：

class MainActivity : AppCompatActivity(),FirstFragment.OnFragmentInteractionListener,SecondFragment.OnFragmentInteractionListener, NavigationView.OnNavigationItemSelectedListener { override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) setSupportActionBar(toolbar) fab.setOnClickListener { view -> Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG).setAction("Action", null).show() } val toggle = ActionBarDrawerToggle(this, drawer_layout, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close) drawer_layout.addDrawerListener(toggle) toggle.syncState() 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.main, 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.first_activity -> { title = "Fragment One" val fragment = FirstFragment() val fragmentTransaction = supportFragmentManager.beginTransaction() fragmentTransaction.replace(R.id.fragmentID, fragment, "FragmentOne") //create first framelayout with id fram in the activity where fragments will be displayed fragmentTransaction.commit() // Handle the camera action } R.id.second_activity -> { title = "Fragment Second" val fragment = SecondFragment() val fragmentTransaction = supportFragmentManager.beginTransaction() fragmentTransaction.replace(R.id.fragmentID, fragment, "FragmentSecond") //create first framelayout with id fram in the activity where fragments will be displayed fragmentTransaction.commit() } R.id.nav_share -> { } R.id.nav_exit -> { System.exit(0) } } drawer_layout.closeDrawer(GravityCompat.START) return true } override fun onFragmentInteraction(uri: Uri) { TODO("not implemented") //To change body of created functions use File | Settings | File Templates. } } 

这是我的FirstFragent文件：

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 class FirstFragment : Fragment() { private var mParam1: String? = null private var mParam2: String? = null private var mListener: OnFragmentInteractionListener? = null override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) if (arguments != null) { mParam1 = arguments.getString(ARG_PARAM1) mParam2 = arguments.getString(ARG_PARAM2) } } override fun onCreateView(inflater: LayoutInflater?, container: ViewGroup?, savedInstanceState: Bundle?): View? { // Inflate the layout for this fragment return inflater!!.inflate(R.layout.fragment_first, container, false) } // TODO: Rename method, update argument and hook method into UI event fun onButtonPressed(uri: Uri) { if (mListener != null) { mListener!!.onFragmentInteraction(uri) } } override fun onAttach(context: Context?) { super.onAttach(context) if (context is OnFragmentInteractionListener) { mListener = context } else { throw RuntimeException(context!!.toString() + " must implement OnFragmentInteractionListener") } } override fun onDetach() { super.onDetach() mListener = null } /** * This interface must be implemented by activities that contain this * fragment to allow an interaction in this fragment to be communicated * to the activity and potentially other fragments contained in that * activity. * * * See the Android Training lesson [Communicating with Other Fragments](http://developer.android.com/training/basics/fragments/communicating.html) for more information. */ interface OnFragmentInteractionListener { // TODO: Update argument type and name fun onFragmentInteraction(uri: Uri) } companion object { // TODO: Rename parameter arguments, choose names that match // the fragment initialization parameters, eg ARG_ITEM_NUMBER private val ARG_PARAM1 = "param1" private val ARG_PARAM2 = "param2" /** * Use this factory method to create a new instance of * this fragment using the provided parameters. * * @param param1 Parameter 1. * @param param2 Parameter 2. * @return A new instance of fragment FirstFragment. */ // TODO: Rename and change types and number of parameters fun newInstance(param1: String, param2: String): FirstFragment { val fragment = FirstFragment() val args = Bundle() args.putString(ARG_PARAM1, param1) args.putString(ARG_PARAM2, param2) fragment.arguments = args return fragment } } 

} //必须为空的公共构造函数

这是我的FirstFragment布局xml文件：

Answer 1

所以，你所缺少的是抓住你的片段的视图，以及它里面的视图（主要是你的按钮和你的TextView），并对它们做些什么。

在你的FirstFragment.kt：

 private lateinit var mTextView: TextView override fun onCreateView(inflater: LayoutInflater?, container: ViewGroup?, savedInstanceState: Bundle?): View? { // Inflate the layout for this fragment val view = inflater!!.inflate(R.layout.fragment_first, container, false) mTextView = findViewById(R.id.text) findViewById(R.id.button).setOnClickListener { mTextView.text = "Hi" } return view } 

Answer 2

在那些片段中创建onViewCreated的overover这里是一个代码：

 override fun onViewCreated(view: View?, savedInstanceState: Bundle?) { super.onViewCreated(view, savedInstanceState) button.setOnClickListener{ text.setText("Hello") } }