Android开发之如何自定义数字键盘详解

//就不解释了，通过名字应该看得出来
 public static final int KEYCODE_SHIFT = -1;
 public static final int KEYCODE_MODE_CHANGE = -2;
 public static final int KEYCODE_CANCEL = -3;
 public static final int KEYCODE_DONE = -4;
 public static final int KEYCODE_DELETE = -5;
 public static final int KEYCODE_ALT = -6;

class CustomKeyboardView : KeyboardView {
 private var mKeyBoard: Keyboard? = null

 constructor(context: Context, attrs: AttributeSet) : this(context, attrs,0) {}

 constructor(context: Context, attrs: AttributeSet, defStyle: Int) : super(context, attrs, defStyle) {
 //
 }

 override fun onDraw(canvas: Canvas) {
 super.onDraw(canvas)
 mKeyBoard = this.keyboard
 var keys: MutableList? = null
 if (mKeyBoard != null) {
 keys = mKeyBoard!!.keys
 }
 if (keys != null) {
 for (key in keys) {
 //可以自定义自己的绘制（例如某个按钮绘制背景图片和文字，亦或者更改某个按钮颜色等）
 if (key.codes[0] == -111) {//过滤指定某个键自定义绘制
 }
 }
 }
 }
}

 if (key.codes[0] == -111) {//过滤指定某个键自定义绘制
  //绘制后，原来xml中的keyLabel以及keyIcon会被覆盖,如需显示文字
  //需要自己重新绘制，要后绘制文字，否则文字不显示
  drawBackground(R.drawable.bg_keyboardview1, canvas, key)
  drawTextOrIcon(canvas, key)
 }

 //绘制背景
 fun drawBackground(drawableId: Int, canvas: Canvas, key: Keyboard.Key) {
 var drawable = resources.getDrawable(drawableId)
 var drawableState: IntArray = key.currentDrawableState
 if (key.codes[0] != 0) {
  drawable.state=drawableState
 }
 drawable.bounds = Rect(key.x, key.y, key.x + key.width, key.height + key.y)
 drawable.draw(canvas)
 }

 //绘制文字或图标
 fun drawTextOrIcon(canvas: Canvas, key: Keyboard.Key) {
 var bounds = Rect()
 var paint = Paint()
 paint.color = Color.WHITE
 paint.isAntiAlias = true
 paint.textAlign = Paint.Align.CENTER
 paint.typeface = Typeface.DEFAULT
 if (key.label != null) {
  var label = key.label.toString()
  //为了将字体大小与默认绘制的Label字体大小相同，需要反射获取默认大小。然后在此处设置文字大小
  //还有一种取巧的方法在布局文件keyboardview中设置keyTextSize，labelTextSize
  var field = KeyboardView::class.java.getDeclaredField("mLabelTextSize")
  field.isAccessible = true
  var labelTextSize = field.get(this) as Int
  paint.textSize = labelTextSize.toFloat()
  paint.getTextBounds(label, 0, label.length, bounds)
  canvas.drawText(label, (key.x + key.width / 2).toFloat(), (key.y + key.height / 2 + bounds.height() / 2).toFloat(), paint)
 } else if (key.icon != null) {
  key.icon.bounds = Rect(key.x + (key.width - key.icon.intrinsicWidth) / 2, key.y + (key.height - key.icon.intrinsicHeight) / 2, key.x + (key.width - key.icon.intrinsicWidth) / 2 + key.icon.intrinsicWidth, key.y + (key.height - key.icon.intrinsicHeight) / 2 + key.icon.intrinsicHeight)
  key.icon.draw(canvas)
 }
 }

 constructor(activity: Activity) : this(activity, true, false)
 /**
 * @param activity
 * @param isRandom 是否时随机键盘
 * @param mIsDecimal 是否支持小数输入
 */
 constructor(activity: Activity, isRandom: Boolean, isDecimal: Boolean) {
 mActivity = activity
 mIsRandom = isRandom
 mIsDecimal = isDecimal
 mKeyboard = Keyboard(mActivity, R.xml.keyboard)
 addViewToRoot()
 }

//加载自定义的键盘layout
 private fun addViewToRoot() {
 mKeyBoardViewContainer = mActivity.layoutInflater.inflate(R.layout.keyboardview, null)
 //var frameLayout: FrameLayout = mActivity.window.decorView as FrameLayout//不要直接往DecorView(状态栏，内容，导航栏)中addView，如使用这个则最后显示布局不全（一部分内容在导航栏区域）
 var frameLayout: FrameLayout = mActivity.window.decorView.find(android.R.id.content)
 var lp = FrameLayout.LayoutParams(FrameLayout.LayoutParams.MATCH_PARENT, FrameLayout.LayoutParams.WRAP_CONTENT)
 lp.gravity = Gravity.BOTTOM
 frameLayout.addView(mKeyBoardViewContainer, lp)
 mKeyBoardView = mKeyBoardViewContainer.find(R.id.keyboard_view)
 }

fun attachTo(editText: EditText) {
 //如果editText与上次设置的是同一个对象，并且键盘已经正在在显示，不再执行后续操作
 if (mEditText != null && mEditText == editText && mKeyBoardView.visibility == View.VISIBLE) return
 mEditText = editText
 Log.e(TAG, "attachTo")
 //根据焦点及点击监听，来显示或者隐藏键盘
 onFoucsChange()
 //隐藏系统键盘
 hideSystemSoftKeyboard()
 //显示自定义键盘
 showSoftKeyboard()
 }

 private fun onFoucsChange() {
 mEditText!!.setOnFocusChangeListener { v, hasFocus ->
  Log.e(TAG, "onFoucsChange:$hasFocus" + v)
  //如果获取焦点，并且当前键盘没有显示，则显示，并执行动画
  if (hasFocus && mKeyBoardView.visibility != View.VISIBLE) {
  mKeyBoardView.visibility = View.VISIBLE
  startAnimation(true)
  } else if (!hasFocus && mKeyBoardView.visibility == View.VISIBLE) {
  //如果当前时失去较大，并且当前在键盘正在显示，则隐藏
  mKeyBoardView.visibility = View.GONE
  startAnimation(false)
  }
 }

 mEditText!!.setOnClickListener {
  Log.e(TAG, "setOnClickListener")
  //根据上面焦点的判断，如果已经获取到焦点，并且键盘隐藏。再次点击时，
  // 焦点改变函数不会回调，所以在此判断如果隐藏就显示
  if (mKeyBoardView.visibility == View.GONE) {
  mKeyBoardView.visibility = View.VISIBLE
  startAnimation(true)
  }
 }
 }

 private fun hideSystemSoftKeyboard() {
 //11版本开始需要反射setShowSoftInputOnFocus方法设置false，来隐藏系统软键盘
 if (Build.VERSION.SDK_INT > 10) {
  var clazz = EditText::class.java
  var setShowSoftInputOnFocus: Method? = null
  setShowSoftInputOnFocus = clazz.getMethod("setShowSoftInputOnFocus", Boolean::class.java)
  setShowSoftInputOnFocus.isAccessible = true
  setShowSoftInputOnFocus.invoke(mEditText, false)
 } else {
  mEditText!!.inputType = InputType.TYPE_NULL
 }
 var inputMethodManager = mActivity.applicationContext.inputMethodManager
 inputMethodManager.hideSoftInputFromWindow(mEditText!!.windowToken, 0)
 }

private fun showSoftKeyboard() {
 if (mIsRandom) {
  //生成随机键盘
  generateRandomKey()
 } else {
  //有序键盘
  mKeyBoardView.keyboard = mKeyboard
 }
 mKeyBoardView.isEnabled = true
 //设置预览，如果设置false，则就不现实预览效果
 mKeyBoardView.isPreviewEnabled = true
 //设置可见
 mKeyBoardView.visibility = View.VISIBLE
 //指定键盘弹出动画
 startAnimation(true)
 //设置监听
 mKeyBoardView.setOnKeyboardActionListener(mOnKeyboardActionListener())
 }

 private fun generateRandomKey() {
 var keys = mKeyboard.keys
 var numberKeys = mutableListOf()
 //保存数字
 var nums = mutableListOf()
 //0的ASCII码是48,之后顺序加1
 for (key in keys) {
  //过滤数字键盘
  if (key.label != null && "0123456789".contains(key.label)) {
  nums.add(Integer.parseInt(key.label.toString()))
  numberKeys.add(key)
  }
 }
 var random = Random()
 var changeKey = 0//更改numberKeys对应的数值
 while (nums.size > 0) {
  var size = nums.size
  var randomNum = nums[random.nextInt(size)]
  var key = numberKeys[changeKey++]
  key.codes[0] = 48 + randomNum
  key.label = randomNum.toString()
  nums.remove(randomNum)
 }
 mKeyBoardView.keyboard = mKeyboard
 }

 inner class mOnKeyboardActionListener : KeyboardView.OnKeyboardActionListener {
 override fun swipeRight() {
  Log.e(TAG, "swipeRight")
 }

 override fun onPress(primaryCode: Int) {
  Log.e(TAG, "onPress")
  //添加震动效果
  mActivity.applicationContext.vibrator.vibrate(50)
  ////指定隐藏（确定）删除不显示预览
  mKeyBoardView.isPreviewEnabled = !(primaryCode == Keyboard.KEYCODE_DONE || primaryCode == Keyboard.KEYCODE_DELETE)
 }

 override fun onRelease(primaryCode: Int) {
  Log.e(TAG, "onRelease")
 }

 override fun swipeLeft() {
  Log.e(TAG, "swipeLeft")
 }

 override fun swipeUp() {
  Log.e(TAG, "swipeUp")
 }

 override fun swipeDown() {
  Log.e(TAG, "swipeDown")
 }

 override fun onKey(primaryCode: Int, keyCodes: IntArray?) {
  Log.e(TAG, "onKey primaryCode:$primaryCode keyCodes:$keyCodes")
  if (mEditText == null) throw RuntimeException("The mEditText is null,Please call attachTo method")

  mEditText?.let {
  var editable: Editable = it.text
  var textString = editable.toString()
  //获取光标位置
  var start = it.selectionStart
  when (primaryCode) {
   //如果是删除键，editable有值并且光标大于0（即光标之前有内容），则删除
   Keyboard.KEYCODE_DELETE -> {
   if (!editable.isNullOrEmpty()) {
    if (start > 0) {
    editable.delete(start - 1, start)
    } else {
    }
   } else {
   }
   }
   Keyboard.KEYCODE_DONE -> {
   hideSoftKeyboard()
   mOnOkClick?.let {
    //点击确定时，写一个回调，如果你对有确定的需求
    it.onOkClick()
   }
   }
   else -> {
   // 由于promaryCode是用的ASCII码，则直接转换字符即可，46是小数点
   if (primaryCode != 46 ) {
    //如果点击的是数字，不是小数点，则直接写入EditText,由于我codes使用的是ASCII码，
    // 则可以直接转换为数字。当然可以你也可以获取label，或者根据你自己随便约定。
    editable.insert(start, Character.toString(primaryCode.toChar()))
   } else {
    //如果点击的是逗号
    if (mIsDecimal && primaryCode == 46) {
    if ("" == textString) {
     //如果点的是小数点，并且当前无内容，自动加0
     editable.insert(start, "0.")
    } else if (!textString.contains(".")) {
     //当前内容不含有小数点，并且光标在第一个位置，依然加0操作
     if (start == 0) {
     editable.insert(start, "0.")
     } else {
     editable.insert(start, ".")
     }
    } else {
     //如果是不允许小数输入，或者允许小数，但是已经有小数点，则不操作
    }
    } else {
    }
   }
   }
  }
  }
 }

 override fun onText(text: CharSequence?) {
  Log.e(TAG, "onText:" + text.toString())
 }

 }
 fun hideSoftKeyboard(): Boolean {
 if (mEditText == null) return false
 var visibility = mKeyBoardView.visibility
 if (visibility == View.VISIBLE) {
  startAnimation(false)
  mKeyBoardView.visibility = View.GONE
  return true
 }
 return false
 }

 fun startAnimation(isIn: Boolean) {
 Log.e(TAG, "startAnimation")
 var anim: Animation
 if (isIn) {
  anim = AnimationUtils.loadAnimation(mActivity, R.anim.anim_bottom_in)
 } else {
  anim = AnimationUtils.loadAnimation(mActivity, R.anim.anim_bottom_out)
 }
 mKeyBoardViewContainer.startAnimation(anim)
 }

 keyboardUtli = KeyBoardUtil(this@KeyBoardDemoActivity)
 et_keyboard.setOnTouchListener { v, event ->
  keyboardUtli?.attachTo(et_keyboard)
  //设置是否可以输入小数
  keyboardUtli?.mIsDecimal = true
  false
 }
 et_keyboard2.setOnTouchListener { v, event ->
  keyboardUtli?.attachTo(et_keyboard2)
  keyboardUtli?.mIsDecimal = false
  false
 }