在Android中验证edittext [英] Validating edittext in Android

问题描述

我是安卓新手我正在尝试为一个项目编写应用程序.

I'm new to android & I'm trying to write an application for a project.

我需要检查用户是否在编辑文本中输入了 7 个数字和一个字母.示例:0000000x

I need to check whether the user has entered 7 numbers followed by one alphabet in edittext. Example: 0000000x

我该怎么做?蒂亚！:)

How should I do that? TIA! :)

推荐答案

可能最好的方法是使用 TextWatcher 传入 addTextChangedListener() 方法.这是一个使用示例:

Probably the best approach would be to use a TextWatcher passed into the addTextChangedListener() method of the EditText. Here is an example use:

editText.addTextChangedListener(new TextWatcher() {
  @Override
  public void afterTextChanged(Editable e) {
    String textFromEditView = e.toString();
    validateText(textFromEditView);
  }

  @Override
  public void beforeTextChanged(CharSequence s, int start, int count, int after) {
    //nothing needed here...
  }

  @Override
  public void onTextChanged(CharSequence s, int start, int before, int count) {
    //nothing needed here...
  }
});

我将把 validateText(String) 方法的实现留给读者作为练习，但我想它应该足够简单.我会使用:

I will leave the implementation of the validateText(String) method as an exercise for the reader, but I imagine it should be easy enough. I would either use:

1. 一个简单的正则表达式.
2. 或者由于这种情况很简单，检查字符串的长度是否为 8，并检查每个字符.有一个简单的实用程序类来检查字符的特征.Character.isDigit(char) 和 Character.isLetter(char)

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