liyiwin / DiscountSeekbarTextWatcher

DiscountSeekbarTextWatcher

基本說明

主要練習項目：

SeekBar / SeekBarChangeListener

editText / addTextChangedListener

說明：

1.折扣TextView的部分： 折扣TextView 的 text文字 代表 SeekBar的 拖曳的進度

    seekBar.setOnSeekBarChangeListener(object:SeekBar.OnSeekBarChangeListener {
        override fun onStopTrackingTouch(seekBar: SeekBar?) {

               }

        override fun onStartTrackingTouch(seekBar: SeekBar?) {
               }

        override fun onProgressChanged(seekBar: SeekBar?, progress: Int, fromUser: Boolean) {
        
        
            //折扣TextView
            discount.setText(progress.toString()+"%")

       }

    }

  )

2.原價 edittext 輸入 Seekbar 與 結算 TextView 的關係：

Seekbar 拖曳時

    seekBar.setOnSeekBarChangeListener(object:SeekBar.OnSeekBarChangeListener {
        override fun onStopTrackingTouch(seekBar: SeekBar?) {

               }

        override fun onStartTrackingTouch(seekBar: SeekBar?) {
               }

        override fun onProgressChanged(seekBar: SeekBar?, progress: Int, fromUser: Boolean) {

            after.setText("${editText.text.toString().toFloat()*progress/100}")
            
             pg = progress
            //pg 為全域變數，用來儲存 progress 供其他地方使用


       }


    }

  )

當Edittext 輸入 不一樣的價格

   editText.addTextChangedListener(object:TextWatcher{
      override fun onTextChanged(s: CharSequence?, start: Int, before: Int, count: Int) {
          }

      override fun beforeTextChanged(s: CharSequence?, start: Int, count: Int, after: Int) {
         }

      override fun afterTextChanged(s: Editable?) {

          if (editText.text.toString()!= "" )
              after.setText("${editText.text.toString().toFloat()*pg/100}")

              else

              after.setText("0")

     }

   }

  )