//首先定義需要的那些按鍵//順序打亂,展示的時候也就是亂序的,可以更安全.//特殊按鍵-> "":表示空白占位按鍵; "-1":表示回退鍵, 也就是刪除.var keys = arrayOf("1", "2", "3", "4", "5", "6", "7", "8", "9", "", "0", "-1")

 keys.forEach {  val keyView: View = when (it) {   "-1" -> {    //刪除    imageView(R.drawable.keyboard_del, R.drawable.keyboard_del_press).apply {     background = null     setBackgroundColor(Color.parseColor("#E2E7ED"))    }   }   "" -> {    //占位View    View(context).apply {     setBackgroundColor(Color.parseColor("#E2E7ED"))    }   }   else -> {    createKeyView(it)   }  }  keyView.tag = it //通過tag, 保存按鍵對應的值  addView(keyView) }private fun createKeyView(key: String): View {  return if (useImageKey) {   val keyRes = when (key) {    "1" -> R.drawable.keyboard_1    "2" -> R.drawable.keyboard_2    "3" -> R.drawable.keyboard_3    "4" -> R.drawable.keyboard_4    "5" -> R.drawable.keyboard_5    "6" -> R.drawable.keyboard_6    "7" -> R.drawable.keyboard_7    "8" -> R.drawable.keyboard_8    "9" -> R.drawable.keyboard_9    else -> R.drawable.keyboard_0   }   imageView(keyRes)  } else {   textView(key)  } } private fun imageView(res: Int, pressRes: Int = -1): ImageView {  return ImageView(context).apply {   if (pressRes == -1) {    setImageResource(res)   } else {    setImageResource(res)    //setImageDrawable(ResUtil.selector(getDrawable(res), getDrawable(pressRes)))   }   scaleType = ImageView.ScaleType.CENTER   keyViewBGDrawable?.let {    background = it.constantState.newDrawable()   }   setOnClickListener(this@KeyboardLayout)  } } private fun textView(text: String): TextView {  return TextView(context).apply {   gravity = Gravity.CENTER   this.text = text   setTextSize(TypedValue.COMPLEX_UNIT_PX, keyTextSize)   keyViewBGDrawable?.let {    background = it.constantState.newDrawable()   }   setTextColor(Color.BLACK)   setOnClickListener(this@KeyboardLayout)  } }

 override fun onMeasure(widthMeasureSpec: Int, heightMeasureSpec: Int) {  //super.onMeasure(widthMeasureSpec, heightMeasureSpec)  var widthSize = MeasureSpec.getSize(widthMeasureSpec)  val widthMode = MeasureSpec.getMode(widthMeasureSpec)  var heightSize = MeasureSpec.getSize(heightMeasureSpec)  val heightMode = MeasureSpec.getMode(heightMeasureSpec)  if (widthMode != MeasureSpec.EXACTLY) {   widthSize = resources.displayMetrics.widthPixels  }  if (heightMode != MeasureSpec.EXACTLY) {   heightSize = (4 * keyViewHeight + 3 * vSpace).toInt()  }  childWidth = ((widthSize - 2 * hSpace - paddingLeft - paddingRight) / 3).toInt()  childHeight = ((heightSize - 3 * vSpace - paddingTop - paddingBottom) / 4).toInt()  childs { _, view ->   view.measure(exactlyMeasure(childWidth), exactlyMeasure(childHeight))  }  setMeasuredDimension(widthSize, heightSize) }

override fun onLayout(changed: Boolean, l: Int, t: Int, r: Int, b: Int) { //一行一行布局, 共4行 for (line in 0..3) {  var top: Int = (paddingTop + line * (childHeight + vSpace)).toInt()  //3列  for (i in 0..2) {   var left: Int = (paddingLeft + i * (childWidth + hSpace)).toInt()   getChildAt(line * 3 + i).layout(left, top, left + childWidth, top + childHeight)  } }}

 override fun onClick(v: View?) {  if (onKeyboardInputListener == null) {   return  }  v?.let { view ->   val tag = view.tag   if (tag is String) {    val isDel = "-1" == tag    onKeyboardInputListener?.onKeyboardInput(tag, isDel)   }  } }

<?xml version="1.0" encoding="utf-8"?><resources> <declare-styleable name="KeyboardLayout">  <attr name="r_key_height" format="dimension"/>  <attr name="r_key_width" format="dimension"/>  <attr name="r_key_text_size" format="dimension"/>  <attr name="r_key_background" format="reference"/>  <attr name="r_background" format="reference"/>  <attr name="r_use_image_key" format="boolean"/> </declare-styleable></resources>

 init {  val typedArray = context.obtainStyledAttributes(attributeSet, R.styleable.KeyboardLayout) //注意1:  keyViewHeight = typedArray.getDimensionPixelOffset(R.styleable.KeyboardLayout_r_key_height, keyViewHeight)  //typedArray.getDimensionPixelOffset(R.styleable.KeyboardLayout_r_key_width, keyViewHeight)  keyTextSize = typedArray.getDimension(R.styleable.KeyboardLayout_r_key_text_size, keyTextSize)  useImageKey = typedArray.getBoolean(R.styleable.KeyboardLayout_r_use_image_key, useImageKey)  keyViewBGDrawable = typedArray.getDrawable(R.styleable.KeyboardLayout_r_key_background)  if (keyViewBGDrawable == null) {   keyViewBGDrawable = getDrawable(R.drawable.base_white_bg_selector)  }  mBackgroundDrawable = typedArray.getDrawable(R.styleable.KeyboardLayout_r_background)  if (mBackgroundDrawable == null) {   mBackgroundDrawable = ColorDrawable(getColor(R.color.base_chat_bg_color))  }  setWillNotDraw(false)  typedArray.recycle() //注意2 }