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因為每個按鍵都考慮到需要支持背景設置等其他個性設置和Touch手勢的處理, 所以我決定采用 每個按鍵 對應一個View的思路實現. 否則可以使用Canvas.drawText實現
這樣可以提高擴展性和可自定義性
1.根據效果圖先定義按鍵
//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")更新對應的按鍵, 創建對應的view
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) } }2.按鍵元素創建好之后, 開始自定義ViewGroup的標準操作
onMeasure:測量每個按鍵的寬度和高度
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) }onLayout:決定按鍵在ViewGroup中的坐標位置
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) } }}3:事件監聽和回調
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) } } }4:xml中的屬性聲明
需要在 values 文件夾中創建一個任意文件名的xml文件
<?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>
declare-styleable 都是標準寫法, name對應的就是自定義view的類型, 都是標準寫法, 不同的format對應不同的get方法. 熟悉了就很容易使用.
5:xml中的屬性讀取
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 }注意1,2: 都是必備的寫法, 中間部分才是對應的屬性讀取操作.
源碼地址 https://github.com/angcyo/KeyboardLayout （本地下載）
總結
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