EditText 上 Android 中的电子邮件地址验证

问题描述

我们如何在 android 中的 edittext 上执行 Email Validation ?我已经通过 google &所以，但我没有找到一种简单的方法来验证它.

How can we perform Email Validation on edittext in android ? I have gone through google & SO but I didn't find out a simple way to validate it.

推荐答案

要执行电子邮件验证，我们有很多方法，但很简单 &最简单的方法是两种方法.

To perform Email Validation we have many ways,but simple & easiest way are two methods.

1- 使用 EditText(....).addTextChangedListener 会不断触发 EditText 框 中的每个输入，即 email_id 无效或有效

1- Using EditText(....).addTextChangedListener which keeps triggering on every input in an EditText box i.e email_id is invalid or valid

/**
 * Email Validation ex:- [email protected]
*/


final EditText emailValidate = (EditText)findViewById(R.id.textMessage);

final TextView textView = (TextView)findViewById(R.id.text);

String email = emailValidate.getText().toString().trim();

String emailPattern = "[a-zA-Z0-9._-]+@[a-z]+\.+[a-z]+";

emailValidate .addTextChangedListener(new TextWatcher() {
    public void afterTextChanged(Editable s) {

    if (email.matches(emailPattern) && s.length() > 0)
        {
            Toast.makeText(getApplicationContext(),"valid email address",Toast.LENGTH_SHORT).show();
            // or
            textView.setText("valid email");
        }
        else
        {
             Toast.makeText(getApplicationContext(),"Invalid email address",Toast.LENGTH_SHORT).show();
            //or
            textView.setText("invalid email");
        }
    }
    public void beforeTextChanged(CharSequence s, int start, int count, int after) {
    // other stuffs
    }
    public void onTextChanged(CharSequence s, int start, int before, int count) {
    // other stuffs
    }
});

2- 使用 if-else 条件的最简单方法.使用 getText() 获取 EditText 框字符串并与为电子邮件提供的模式进行比较.如果模式不匹配或不匹配，按钮的 onClick 会显示一条消息.它不会在 EditText 框中的每个字符输入时触发.如下所示的简单示例.

2- Simplest method using if-else condition. Take the EditText box string using getText() and compare with pattern provided for email. If pattern doesn't match or macthes, onClick of button toast a message. It ll not trigger on every input of an character in EditText box . simple example shown below.

final EditText emailValidate = (EditText)findViewById(R.id.textMessage);

final TextView textView = (TextView)findViewById(R.id.text);

String email = emailValidate.getText().toString().trim();

String emailPattern = "[a-zA-Z0-9._-]+@[a-z]+\.+[a-z]+";

// onClick of button perform this simplest code.
if (email.matches(emailPattern))
{
Toast.makeText(getApplicationContext(),"valid email address",Toast.LENGTH_SHORT).show();
}
else
{
Toast.makeText(getApplicationContext(),"Invalid email address", Toast.LENGTH_SHORT).show();
}

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