Question

我正在尝试从片段中的按钮捕获onClick事件，但是它不起作用。

有什么建议吗？

我有这个主要活动，我通过bottomNavigation调用该片段。 MainActivity.kt：

    class MainActivity : FragmentActivity()  {

    private val mOnNavigationItemSelectedListener = BottomNavigationView.OnNavigationItemSelectedListener { item ->
        when (item.itemId) {
            R.id.navigation_home -> {
                showFragmentSetup()
                return@OnNavigationItemSelectedListener true
            }
        }
        false
    }

    fun showFragmentSetup(){
        val setupFragment = SetupFragment()
        val manager = supportFragmentManager
        val transaction = manager.beginTransaction()
        transaction.replace(R.id.setupFragment, setupFragment)
        transaction.addToBackStack(null)
        transaction.commit()
    }

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

        navigation.setOnNavigationItemSelectedListener(mOnNavigationItemSelectedListener)
    }
}

activity_main.xml是linearLayout的容器，它将包含该片段。

activity_main.xml

    <LinearLayout
        android:id="@+id/setupFragment"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_weight="1"
        android:orientation="vertical"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        />

我的片段很简单，它只有一个按钮，我想从该按钮捕获onClickEvent

    class SetupFragment : Fragment(){

    override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?,
                              savedInstanceState: Bundle?): View? {

        // Inflate the layout for this fragment
        return inflater.inflate(R.layout.fragment_setup, container, false)

        val view: View = inflater!!.inflate(R.layout.fragment_setup, container, false)

        btnSetup.setOnClickListener { view ->
            Log.d("btnSetup", "Selected")
        }

        // Return the fragment view/layout
        return view
    }

    companion object {
        fun newInstance(): SetupFragment {
            return SetupFragment()
        }
    }

}

Answer 1

您要返回，然后才能在此处设置侦听器：

 override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?,
                              savedInstanceState: Bundle?): View? {

        // Inflate the layout for this fragment
        return inflater.inflate(R.layout.fragment_setup, container, false)

        val view: View = inflater!!.inflate(R.layout.fragment_setup, container, false)

        btnSetup.setOnClickListener { view ->
            Log.d("btnSetup", "Selected")
        }

        // Return the fragment view/layout
        return view
    }

尝试这样：

 override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?,
                              savedInstanceState: Bundle?): View? {


        val view: View = inflater!!.inflate(R.layout.fragment_setup, container, false)

        view.btnSetup.setOnClickListener { view ->
            Log.d("btnSetup", "Selected")
        }

        // Return the fragment view/layout
        return view
    }

Answer 2

您没有为该按钮提供视图

lateinit var mView: View
override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
    mView=inflater.inflate(R.layout.product_list,container,false)

    mView.addProduct.setOnClickListener {

        val intent=Intent(activity,ProductAddActivity::class.java)
        startActivity(intent)
    }
    return mView
}

Answer 3

我认为您应该在“ SetupFragment”中使用“ onViewCreated”功能

pref2

片段中的Kotlin按钮onClickListener事件

3 个答案: