金额输入控制代码

每个人的实现思路不一样,写起来费劲这里做个笔记。

 <EditText
            android:inputType="number"
            android:singleLine="true"
            android:digits="0123456789."
            android:id="@+id/moneyEd"
            android:background="@null"
            android:layout_toLeftOf="@+id/del_money"
            android:layout_toRightOf="@+id/num_key"
            android:layout_marginLeft="@dimen/dimen_20dp"
            android:layout_centerVertical="true"
            android:layout_width="wrap_content"
            android:textColor="@color/color_333333"
            android:textSize="@dimen/font_size_36"
            android:layout_height="wrap_content"/>

moneyEd.addTextChangedListener(object : TextWatcher {
            override fun afterTextChanged(tv: Editable?) {
                var toString = tv.toString()
                if (toString.isNotEmpty()) {
                    moneyEd.removeTextChangedListener(this)
                    val split = toString.split(".")
                    val size = split.size
                    if ("." == toString) toString = "0."
                    var substring = when (size) {
                        1 -> toString
                        2 -> if (split[1].length > 2) toString.substring(0,toString.indexOf(".")+3) else toString
                        3 -> toString.substring(0, toString.lastIndexOf("."))
                        else -> toString.substring(0, toString.indexOf("."))
                    }

                    if (substring.toDouble() > comeMoney.toDouble()) substring = comeMoney
                    moneyEd.setText(substring)
                    moneyEd.setSelection(substring.length)
                    moneyEd.addTextChangedListener(this)
                }
            }

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

            override fun onTextChanged(s: CharSequence?, start: Int, before: Int, count: Int) {
            }
        })

当然用下面这个正则实现更简单

 "".matches("(^[1-9]([0-9]+)?(\\.[0-9]{1,2})?\$)|(^(0){1}\$)|(^[0-9]\\.[0-9]([0-9])?\$)".toRegex())