package com.ttyh.customview.animation

import android.content.Context
import android.util.AttributeSet
import android.util.Log
import android.view.LayoutInflater
import android.widget.Button
import android.widget.EditText
import android.widget.RelativeLayout
import com.ttyh.customview.R

/**
 * @author Create by RUOQ
 * @description:
 * @create_date :2022/4/1-10:49
 * @Modified_time : 2022/4/1-10:49
 */
class InputNumberView : RelativeLayout {
    private var mCurrentNumber:Int = 0
    private lateinit var mBtnMinus:Button
    private lateinit var mBtnPlus:Button   //控件延迟初始化
    private lateinit var mEtv:EditText
    var mMin = 0
    var mMax = 30
    var mStep = 1
    private var mDisable = false
    private var mBtnColor = -1
    private var mDefaultValue = 0
    var onNumberChangeListener: ((Int) -> Unit)? = null   //通过高阶函数的方法暴露接口，更新数值的变化

    constructor(context: Context) : this(context, null)
    constructor(context: Context, attrs: AttributeSet?) : this(context, attrs, 0)
    constructor(context: Context, attrs: AttributeSet?, defStyleAttr: Int) : super(
        context,
        attrs,
        defStyleAttr
    ) {

        //初始化属性
        initAttrs()
        //初始化视图
        initView(context)
        //点击事件
        setupEvent()
    }

    private fun setupEvent() {
        mBtnMinus.setOnClickListener {
            mCurrentNumber -= mStep
            if (mCurrentNumber <= mMin) {
                mCurrentNumber = mMin
                it.isEnabled = false

            }
            mBtnPlus.isEnabled = true
            updateEtv()   //更新数据

        }
        mBtnPlus.setOnClickListener {
            mCurrentNumber += mStep
            if (mCurrentNumber >= mMax) {
                mCurrentNumber = mMax
                it.isEnabled = false
            }
            mBtnMinus.isEnabled = true
            updateEtv()  //更新数据
        }
    }

    private fun initView(context: Context) {
        val view = LayoutInflater.from(context).inflate(R.layout.input_number_view, this, true)
        mBtnMinus = view.findViewById(R.id.btn_minus)
        mBtnPlus = view.findViewById(R.id.btn_plus)
        mEtv = view.findViewById(R.id.edit_text)
        updateEtv()  //用户设置默认值时，更新默认值
        Log.d("qin", "$mDisable")
        mBtnPlus.isEnabled = !mDisable
        mBtnPlus.isEnabled = !mDisable
    }

    private fun initAttrs() {
        //获取相关属性
        val a = context.obtainStyledAttributes(R.styleable.InputNumberView)
        mMin = a.getInt(R.styleable.InputNumberView_min, 0)
        mMax = a.getInt(R.styleable.InputNumberView_max, 30)
        mStep = a.getInt(R.styleable.InputNumberView_step, 1)
        mDisable = a.getBoolean(R.styleable.InputNumberView_disable, true)
        Log.d("InputNumberView", "get---$mDisable")
        mBtnColor = a.getResourceId(R.styleable.InputNumberView_btnColor, -1)
        mDefaultValue = a.getInt(R.styleable.InputNumberView_default_value, 0)
        mCurrentNumber = mDefaultValue
        a.recycle()   //回收数据
    }

    fun getNumber(): Int {
        return mCurrentNumber
    }

    fun setNumber(value: Int) {
        mCurrentNumber = value
        updateEtv()
    }

    private fun updateEtv() {
        mEtv.setText("$mCurrentNumber")
        onNumberChangeListener?.invoke(mCurrentNumber)  //更新数值变化
    }

    //设置默认值的函数
    fun setDefaultValue(value:Int){
        mDefaultValue = value
        mCurrentNumber = mDefaultValue
        updateEtv()
    }

    //设置步长的函数
    fun setStep(step:Int){
        mStep = step
    }

}


自定义的属性

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <declare-styleable name="InputNumberView">
       <attr name="min" format="integer"/>
        <attr name="max" format="integer"/>
        <attr name="step" format="integer"/>
        <attr name="disable" format="boolean"/>
        <attr name="btnColor" format="color|reference"/>
        <attr name="default_value" format="integer"/>
    </declare-styleable>
</resources>

//使用

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.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"
    tools:context=".animation.MainActivity"
    >
 <com.ttyh.customview.animation.InputNumberView
     android:id="@+id/left"
     android:layout_width="wrap_content"
     android:layout_height="50dp"
     app:layout_constraintStart_toStartOf="parent"
     app:layout_constraintTop_toTopOf="parent"
     app:layout_constraintEnd_toEndOf="parent"
     app:min="0"
     app:max="40"
     app:disable="true"
     />
</androidx.constraintlayout.widget.ConstraintLayout>

z在具体使用时出现获取不到xml中定义的自定义属性的情况