kotlin底部弹出的列表对话框(单选)(代码片段)

1.实现底部弹出的列表对话框(单选)效果如下：

    <LinearLayout
        android:id="@+id/ll"
        android:layout_width="match_parent"
        android:layout_height="50dp"
        android:orientation="horizontal">

        <TextView
            android:id="@+id/tv1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginStart="10dp"
            android:layout_marginEnd="10dp"
            android:textSize="30dp" />

        <TextView
            android:id="@+id/tv2"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_marginStart="10dp"
            android:layout_marginEnd="10dp"
            android:layout_weight="1.0"
            android:gravity="right"
            android:textSize="30dp"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintStart_toEndOf="@+id/tv1"
            app:layout_constraintTop_toTopOf="parent" />
    </LinearLayout>

3.MainActivity.kt

class MainActivity : AppCompatActivity() 

    private var list: MutableList<Dict> = ArrayList()
    private var x :Int = 0

    override fun onCreate(savedInstanceState: Bundle?) 
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        tv1.text = "宿舍";tv2.text = "小红"//默认
        initDatas()
        //点击底部弹出的列表对话框
        ll.setOnClickListener 
            for (i in 0 until list.size) 
                if (tv2.text == list[i].dataName)//如果tv2.text是小红找到对应list的i的姓名
                    x = i;//i给x的赋值
                    break
                
            
            //底部弹出的列表对话框
            showBottomRadListDialog(tv1.text.toString(), list[x].dataValue, list as List<Dict>, object : OnResultCallback<String> 
                //列表对话框被点击自己选择某一item数据
                override fun onResult(t: Any) 
                    var dataValue :String = t.toString()
                    for (i in 0 until list.size)
                        if (dataValue == list[i].dataValue)
                            //dataValue对应的list[i].dataValue给tv2.text的赋值
                            tv2.text = list[i].dataName
                            break
                        
                    
                
            )
        
    
    //Dict实体类设置数据，可以看到这数据有规律
    private fun initDatas() 
        var sc = Dict("1", "4", "宿舍", "小红", "1");list.add(sc)
        sc = Dict("2", "4", "宿舍", "小彬", "2");list.add(sc)
        sc = Dict("3", "4", "宿舍", "小强", "3");list.add(sc)
        sc = Dict("4", "4", "宿舍", "小华", "4");list.add(sc)
        sc = Dict("5", "4", "宿舍", "小军", "5");list.add(sc)
        sc = Dict("6", "4", "宿舍", "小文", "6");list.add(sc)
        sc = Dict("7", "4", "宿舍", "小可", "7");list.add(sc)
        sc = Dict("8", "4", "宿舍", "小进", "8");list.add(sc)
        sc = Dict("9", "4", "宿舍", "小明", "9");list.add(sc)
        sc = Dict("10", "4", "宿舍", "小一", "10");list.add(sc)
        sc = Dict("11", "4", "宿舍", "小乐", "11");list.add(sc)
    

4.实体类Dict.kt

public class Dict 
    private String id;//可以忽略
    private String dataType;//可以忽略
    private String dataTypeName;//表示“宿舍”两个字
    private String dataName;//表示宿舍里每人的姓名
    private String dataValue;//表示宿舍里人姓名排序
    ......

5.DialogUtil.kt,底部弹出的列表对话框(单选)

fun showBottomRadListDialog(title:String?,selValue:String?,dictList:List<Dict>, callback: OnResultCallback<String>, defaultBackground:Boolean = true)
    var dialog = AnyLayer.dialog()
        .contentView(R.layout.dialog_list)//列表框布局
        .gravity(Gravity.BOTTOM)
        .animStyle(DialogLayer.AnimStyle.BOTTOM)
    //使用默认的背景
    if(defaultBackground)
        dialog.backgroundDimDefault()
    
    dialog.show()
    dialog.getView<TextView>(R.id.tv_dialog_title).text = title?:""
    var rv = dialog.getView<MaxHeightRecyclerView>(R.id.mRecyclerView)
    //PhoneU:屏障像素获取手机大小(分辨率)
    rv.setMaxHeight(PhoneU.getScreenPix(MyApplication.context)!!.heightPixels * 3 / 5 )
    var selValue: String?= selValue
    var mAdapter = RadListAdapter(selValue).apply
        setOnItemClickListener  _, _, position ->
            var dict = getItem(position)
            dict?.let 
                var mValue = it.dataValue
                if(mValue.equals(selValue))
                    selValue = ""
                else
                    selValue = mValue
                
                setCheckSelValue(selValue)
            
        
    
    rv.adapter = mAdapter
    mAdapter.setList(dictList)
    rv.scrollToPosition(mAdapter.getSelectIndex())
    var fl = dialog.getView<FrameLayout>(R.id.fl_dialog_confirm)
    fl.setOnClickListener 
        dialog.dismiss()
        selValue?.let  it1 -> callback.onResult(it1) 
    

5.源代码zip下载：
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