問題描述

我們如何在 android 中的 edittext 上執行 Email Validation ?我已經通過 google &所以，但我沒有找到一種簡單的方法來驗證它.

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.

推薦答案

要執行電子郵件驗證，我們有很多方法，但很簡單 &最簡單的方法是兩種方法.

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

1- 使用 EditText(....).addTextChangedListener 會不斷觸發 EditText 框 中的每個輸入，即 email_id 無效或有效

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:- tech@end.com
*/


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 條件的最簡單方法.使用 getText() 獲取 EditText 框字符串并與為電子郵件提供的模式進行比較.如果模式不匹配或不匹配，按鈕的 onClick 會顯示一條消息.它不會在 EditText 框中的每個字符輸入時觸發.如下所示的簡單示例.

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();
}

這篇關于EditText 上 Android 中的電子郵件地址驗證的文章就介紹到這了，希望我們推薦的答案對大家有所幫助，也希望大家多多支持html5模板網！