FragmentTransaction无法在Kotlin Android项目中编译 [英] FragmentTransaction won't Compile in Kotlin Android Project

问题描述

在使用Android学习Kotlin的过程中，编译失败以及通常无用的错误文本使我感到困惑.错误文本显示以下内容:

In the process of learning Kotlin with Android, the failure to compile and generally unhelpful error text have left me stumped. The error text says the following:

以下任何一个函数都不能通过参数调用提供.在以下位置定义的add(Fragment !, String！)android.app.FragmentTransaction add(Int，Fragment！)在android.app.FragmentTransaction

None of the following functions can be called with the arguments supplied. add(Fragment!, String!) defined in android.app.FragmentTransaction add(Int, Fragment!) defined in android.app.FragmentTransaction

在两种情况下， Fragment！文本均以红色突出显示.我知道Kotlin用！来引用Java类，但是我似乎无法理解为什么它对我提供输入的方式不满意.

In both instances the Fragment! text is highlighted in red. I am aware that Kotlin refers to Java classes with an !, but I can't seem to understand why it is not happy with the way in which I provided the inputs.

任何见识将不胜感激.

    fun displayEditRoutine(){

    //Set our variables
    var ft = fragmentManager.beginTransaction()

    //Basic "newInstance" constructor to avoid omitting necessary variables
    var frag = EditRoutine.newInstance(mRoutineID,this)

    //Here is where error occurs
    ft.add(R.id.are_container, frag).commit()

}

所引用的EditRoutine类:

The EditRoutine class being referenced:

class EditRoutine : Fragment() {

//Variables
private var mRoutineID: String? = null
private var mListener: OnEditRoutineFragmentListener? = null

//Views
@BindView(R.id.fer_routineName) internal var vRoutine: TextInputEditText? = null

override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    if (arguments != null) {
        mRoutineID = arguments.getString(Keys.b_RoutineID)
    }
}

override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?,
                          savedInstanceState: Bundle?): View? {
    val v = inflater.inflate(R.layout.fragment_edit_routine, container, false)
    ButterKnife.bind(activity)
    return v
}

// TODO: Rename method, update argument and hook method into UI event
fun onButtonPressed(): Unit{
    if (mListener != null && vRoutine!!.text.toString() != "") {
        val contentValues = ContentValues()
        contentValues.put(Routine.Table.KEY_NAME, vRoutine!!.text.toString())

        //Pass the values into the interface
        mListener!!.onDoneClicked(contentValues)
    }
}

override fun onAttach(context: Context) {
    super.onAttach(context)
    if (context is OnEditRoutineFragmentListener) {
        mListener = context
    } else {
        throw RuntimeException(context.toString() + " must implement OnEditRoutineFragmentListener")
    }
}

override fun onDetach() {
    super.onDetach()
    mListener = null
}

//Internal Methods


//Interface
interface OnEditRoutineFragmentListener {
    // TODO: Update argument type and name
    fun onDoneClicked(cv: ContentValues)

}

companion object {

    /**
     * @param routineID = passed ID. If null, don't load content values
     * *
     * @return A new instance of fragment EditRoutine.
     */
    fun newInstance(routineID: String, ctx: Context): EditRoutine {
        val fragment = EditRoutine()
        val args = Bundle()
        args.putString(Keys.b_RoutineID, routineID)
        fragment.arguments = args
        return fragment
    }
}

推荐答案

尝试一下: ft.add(R.id.container_all，片段为片段).commit()

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