用户输入的实时编辑

问题描述

是否有可能自动插入字符到的EditText 作为用户输入数据

Is it possible to auto insert characters into an EditText as the user inputs data?

即。如果用户输入一个长的数字，如 123456789012 ，是有可能出现这个数字，因为他是键入它在编辑文本框中，但有一个破折号每4个人物？

I.e. if the user is entering a long number such as 123456789012, is it possible for this number to appear as he is typing it in the edit text box, but with a dash every 4th character?

所以，当你键入数字，你会上面看到它被输入到的EditText 框，但应该是这样的：1234-5678-9012

So as you type the number above you would see it being entered in the EditText box but would look like this: 1234-5678-9012.

目前我有一个应用程序，你可以输入一个长的数字，然后preSS一个按钮，并将其插入破折号你，但我很好奇，如果它可以在您键入做？

Currently I have an app where you can enter a long number and then press a button and it inserts the dashes for you, but I'm curious if it could be done as you type?

非常感谢您的帮助。

推荐答案

通过标记机器人，我认为你正在讨论关于Android EDITTEXT，是让你可以通过监听TextChangedListener做到这一点，

By tagging android, I think you are discussing about android editText, is so you can do it by listening the TextChangedListener,

编辑：退格键

editText.addTextChangedListener(new TextWatcher() {
            int len=0;
            @Override
            public void afterTextChanged(Editable s) {
                String str = editText.getText().toString();
                 if(str.length()==4&& len <str.length()){//len check for backspace
                    editText.append("-");
                }
            }

            @Override
            public void beforeTextChanged(CharSequence arg0, int arg1, int arg2, int arg3) {

             String str = editText.getText().toString();
              len = str.length();
            }

            @Override
            public void onTextChanged(CharSequence s, int start, int before, int count) {
            }


        });

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