Question

所以我试图通过其中包含多个BaseAdapter的Fragments创建PagerView，但是我遇到了BaseAdapter的一个小问题，我有多个Fragment，但是我将发布1作为示例

class SpellManagement : Fragment(){
    override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
        listViewSpells?.adapter = AllSpells()

        return inflater.inflate(R.layout.activity_spell, container, false)
    }
}

class AllSpells: BaseAdapter() {
        override fun getCount(): Int {
            return player.learnedSpells.size/5+1
        }

        override fun getItemId(position: Int): Long {
            return position.toLong()
        }

        override fun getItem(position: Int): Any {
            return "TEST STRING"
        }

        override fun getView(position: Int, convertView: View?, viewGroup: ViewGroup?): View {
            val rowMain: View

            val index:Int = if(position == 0) 0 else{
                position*5
            }
            if (convertView == null) {
                val layoutInflater = LayoutInflater.from(viewGroup!!.context)
                rowMain = layoutInflater.inflate(R.layout.row_spells_managment, viewGroup, false)
                val viewHolder = ViewHolder(rowMain.buttonSpellsManagment1,rowMain.buttonSpellsManagment2,rowMain.buttonSpellsManagment3,rowMain.buttonSpellsManagment4)
                rowMain.tag = viewHolder
            } else rowMain = convertView
            val viewHolder = rowMain.tag as ViewHolder
            viewHolder.buttonSpellsManagement1.setBackgroundResource(player.learnedSpells[index]!!.drawable)
            viewHolder.buttonSpellsManagement2.setBackgroundResource(player.learnedSpells[index+1]!!.drawable)
            viewHolder.buttonSpellsManagement3.setBackgroundResource(player.learnedSpells[index+2]!!.drawable)
            viewHolder.buttonSpellsManagement4.setBackgroundResource(player.learnedSpells[index+3]!!.drawable)

            viewHolder.buttonSpellsManagement1.setOnClickListener {

            }
            viewHolder.buttonSpellsManagement2.setOnClickListener {

            }
            viewHolder.buttonSpellsManagement3.setOnClickListener {

            }
            viewHolder.buttonSpellsManagement4.setOnClickListener {

            }

            return rowMain
        }

        private class ViewHolder(val buttonSpellsManagement1: Button, val buttonSpellsManagement2: Button, val buttonSpellsManagement3: Button, val buttonSpellsManagement4: Button)
}

我最初使用的是活动，但是在PagerView的情况下，我将其更改为Fragment。我知道的是，我无法调用this等。在某些情况下，我在Java代码中找到的是getActivity（）而不是在Kotlin中找不到的this。因此，可以说它可能位于BaseAdapter的viewGroup!!.context中。任何帮助将不胜感激，谢谢。

XML：

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:screenOrientation="landscape">

    <android.support.constraint.Guideline
        android:id="@+id/guideline9"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        app:layout_constraintGuide_percent="0.8" />

    <android.support.constraint.Guideline
        android:id="@+id/guideline30"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginEnd="15dp"
        android:orientation="horizontal"
        app:layout_constraintEnd_toStartOf="@+id/listViewSpells"
        app:layout_constraintGuide_percent="0.4"
        app:layout_constraintStart_toStartOf="parent" />

    <android.support.constraint.Guideline
        android:id="@+id/guideline10"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginEnd="87dp"
        android:orientation="vertical"
        app:layout_constraintEnd_toStartOf="@+id/guideline7"
        app:layout_constraintGuide_percent="0.1925"
        app:layout_constraintStart_toEndOf="@+id/guideline11" />

    <android.support.constraint.Guideline
        android:id="@+id/guideline11"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="30dp"
        android:layout_marginEnd="83dp"
        android:orientation="vertical"
        app:layout_constraintEnd_toStartOf="@+id/guideline10"
        app:layout_constraintGuide_percent="0.05"
        app:layout_constraintStart_toStartOf="parent" />

    <android.support.constraint.Guideline
        android:id="@+id/guideline13"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginEnd="86dp"
        android:orientation="vertical"
        app:layout_constraintEnd_toStartOf="@+id/guideline14"
        app:layout_constraintGuide_percent="0.4825"
        app:layout_constraintStart_toEndOf="@+id/guideline7" />

    <android.support.constraint.Guideline
        android:id="@+id/guideline14"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginEnd="7dp"
        android:orientation="vertical"
        app:layout_constraintEnd_toStartOf="@+id/imageView3"
        app:layout_constraintGuide_percent="0.63"
        app:layout_constraintStart_toEndOf="@+id/guideline13" />

    <android.support.constraint.Guideline
        android:id="@+id/guideline15"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        app:layout_constraintGuide_percent="0.774" />

    <android.support.constraint.Guideline
        android:id="@+id/guideline16"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        app:layout_constraintGuide_percent="0.92" />


    <android.support.constraint.Guideline
        android:id="@+id/guideline7"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginEnd="83dp"
        android:orientation="vertical"
        app:layout_constraintEnd_toStartOf="@+id/guideline13"
        app:layout_constraintGuide_percent="0.34"
        app:layout_constraintStart_toEndOf="@+id/guideline10" />

    <ListView
        android:id="@+id/listViewSpells"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:layout_marginStart="16dp"
        android:layout_marginTop="8dp"
        android:layout_marginEnd="16dp"
        android:layout_marginBottom="8dp"
        app:layout_constraintBottom_toTopOf="@+id/guideline9"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintEnd_toStartOf="@+id/guideline14"
        app:layout_constraintStart_toEndOf="@+id/guideline30"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <TextView
        android:id="@+id/textViewInfoSpell"
        android:layout_width="0dp"
        android:layout_height="141dp"
        android:layout_marginStart="8dp"
        android:layout_marginEnd="8dp"
        app:layout_constraintBottom_toTopOf="@+id/guideline9"
        app:layout_constraintDimensionRatio="H,1:1.25"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="@+id/guideline14"
        app:layout_constraintTop_toTopOf="@+id/guideline30" />

    <ImageView
        android:id="@+id/imageView2"
        android:layout_width="0dp"
        android:layout_height="75dp"
        android:layout_marginStart="8dp"
        android:layout_marginEnd="8dp"
        app:layout_constraintBottom_toTopOf="@+id/guideline30"
        app:layout_constraintDimensionRatio="H,1:1"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="@+id/guideline14"
        app:layout_constraintTop_toBottomOf="@+id/imageView3" />

    <ImageView
        android:id="@+id/imageView3"
        android:layout_width="0dp"
        android:layout_height="47dp"
        android:layout_marginStart="8dp"
        android:layout_marginEnd="7dp"
        app:layout_constraintDimensionRatio="H,"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.0"
        app:layout_constraintStart_toEndOf="@+id/guideline14"
        app:layout_constraintStart_toStartOf="@+id/guideline14"
        app:layout_constraintTop_toTopOf="parent" />

</android.support.constraint.ConstraintLayout>

Answer 1

我认为您需要在声明视图后使适配器工作。在活动中，调用onCreate方法后，我们可以获取其他作品的视图。它的碎片略有不同。扩大您的视野之后，我们才能拥有视野。

首先，将视图创建为onCreateView函数的第一行。

val view = inflater!!.inflate(R.layout.activity_spells, container, false)

第二，从您的onCreateView函数返回该视图。最后，您可以在其他作品之间放置（使用）其他作品。这样，您可以将viwe（您的片段）用作变量view。您的SpellManagement类将如下所示：

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

    val view = inflater!!.inflate(R.layout.R.layout.activity_spells, container, false)
    \**

    Your other codes or works here

    *\
    listViewSpells?.adapter = AllSpells()

    return view
}

}

我认为这可能会有所帮助。加油！

Answer 2

所以...这对我来说真的很奇怪，答案是创建一个新的ListView，其中使用的是旧时不常用的“ view.FindViewById（...）”东西，由于之前从未使用过，插件，使您可以直接编写组件名称，例如“ listView.adapter = ...”，而不是通过“ view.findViewById（...）”来外部定义它。还结合了 MinnKhant 的this answer。最终代码如下：

class SpellManagement : Fragment(){
    override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
        val view = inflater!!.inflate(R.layout.activity_spell_managment, container, false)

        val listView:ListView = view.findViewById(R.id.listViewSpells)
        listView.adapter = AllSpells()
        return view
    }
}

欢呼

编辑：或者只写view.listViewSpells.adapter = AllSpells（）而不是findViewById（...）

通过PagerView，BaseAdapter在Fragment中不起作用

2 个答案: