如何在Android数字键盘中允许特定字符? [英] How allow a specific character in Android numerical keyboard?

问题描述

我正在开发一个科学应用程序，并且我有一个EditText，因此我必须输入一个输入数值，所以inputType是"number | numberSigned | numberDecimal"，但是问题是当我想输入科学计数法数字时像"45.6E05"一样，由于EditText的InputType，我无法输入"E"字符.

I'm developing an science app, and I have an EditText in wich I must enter an input numeric value, so the inputType is "number|numberSigned|numberDecimal", but the problem is when I want input a scientific notation number like "45.6E05", I can't input "E" character because of EditText's InputType.

当EditText聚焦时，如何允许"E"字符并仅显示数字键盘?

How can to allow "E" character and only to show a numerical keyboard when the EditText is focused?

推荐答案

无法显示带有额外字母E的数字键盘，解决该问题的两种方法是使按钮输入E到您的edittext或使用android:digits属性，例如:

There is no way to show the numerical keyboard with an extra letter E on it, two ways around this are either make a button that inputs E to your edittext or to use the android:digits attribute like such:

android:digits="1234567890E."

括号中的所有字符都是您希望用户能够输入的字符

Where all the characters in the brackets are the ones that you want the user to be able to input

要使用按钮进行操作，只需在其onClickListener中放入以下代码

To make do it using a button, in its onClickListener you just need to put the following code

edittext.setText(edittext.getText().toString() + "E"

另一方面，如果要在光标位置插入字符，则应尝试使用此字符(取自

In the other hand if you want to insert the character in the position of the cursor then you should try this (taken from here)

int start =edittext.getSelectionStart();
String s = "E";
edittext.getText().insert(start, s);

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