我们如何在 Android
上对 edittext
进行 电子邮件验证
?我已经查阅了 Google 和 SO,但我没有找到一个简单的方法来验证它。
我们如何在 Android
上对 edittext
进行 电子邮件验证
?我已经查阅了 Google 和 SO,但我没有找到一个简单的方法来验证它。
Java:
public static boolean isValidEmail(CharSequence target) {
return (!TextUtils.isEmpty(target) && Patterns.EMAIL_ADDRESS.matcher(target).matches());
}
Kotlin:
fun CharSequence?.isValidEmail() = !isNullOrEmpty() && Patterns.EMAIL_ADDRESS.matcher(this).matches()
编辑:它将在Android 2.2及以上版本中运行!
编辑:添加丢失的;
target == null
替换为 TextUtils.isEmpty(target)
。 - rciovatireturn !TextUtils.isEmpty(target) && Patterns.EMAIL_ADDRESS.matcher(target).matches();
(该代码用于判断目标字符串是否为有效的电子邮件地址) - Madan Sapkota进行电子邮件验证有许多方法,但最简单、最容易的方法是两种方法。
1- 使用 EditText(....).addTextChangedListener
,它会在 EditText框
中的每个输入上触发,即email_id是否有效
/**
* 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
条件语句的最简单方法。使用getText()获取EditText框中的字符串,并将其与提供的电子邮件模式进行比较。如果模式不匹配或匹配,点击按钮时会弹出一个消息提示框。它不会在每个字符输入到EditText框中时触发,下面是一个简单的示例。
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();
}
我是这样做的:
添加这个方法来检查电子邮件地址是否有效:
private boolean isValidEmailId(String email){
return Pattern.compile("^(([\\w-]+\\.)+[\\w-]+|([a-zA-Z]{1}|[\\w-]{2,}))@"
+ "((([0-1]?[0-9]{1,2}|25[0-5]|2[0-4][0-9])\\.([0-1]?"
+ "[0-9]{1,2}|25[0-5]|2[0-4][0-9])\\."
+ "([0-1]?[0-9]{1,2}|25[0-5]|2[0-4][0-9])\\.([0-1]?"
+ "[0-9]{1,2}|25[0-5]|2[0-4][0-9])){1}|"
+ "([a-zA-Z]+[\\w-]+\\.)+[a-zA-Z]{2,4})$").matcher(email).matches();
}
现在使用EditText的String进行检查:
if(isValidEmailId(edtEmailId.getText().toString().trim())){
Toast.makeText(getApplicationContext(), "Valid Email Address.", Toast.LENGTH_SHORT).show();
}else{
Toast.makeText(getApplicationContext(), "InValid Email Address.", Toast.LENGTH_SHORT).show();
}
完成
使用此方法验证电子邮件格式。将电子邮件作为字符串传递,如果格式正确,则返回 true;否则返回 false。
/**
* validate your email address format. Ex-akhi@mani.com
*/
public boolean emailValidator(String email)
{
Pattern pattern;
Matcher matcher;
final String EMAIL_PATTERN = "^[_A-Za-z0-9-]+(\\.[_A-Za-z0-9-]+)*@[A-Za-z0-9]+(\\.[A-Za-z0-9]+)*(\\.[A-Za-z]{2,})$";
pattern = Pattern.compile(EMAIL_PATTERN);
matcher = pattern.matcher(email);
return matcher.matches();
}
尝试这个:
if (!emailRegistration.matches("[a-zA-Z0-9._-]+@[a-z]+\.[a-z]+")) {
editTextEmail.setError("Invalid Email Address");
}
public static boolean isEmailValid(String email) {
boolean isValid = false;
String expression = "^[\\w\\.-]+@([\\w\\-]+\\.)+[A-Z]{2,4}$";
CharSequence inputStr = email;
Pattern pattern = Pattern.compile(expression, Pattern.CASE_INSENSITIVE);
Matcher matcher = pattern.matcher(inputStr);
if (matcher.matches()) {
isValid = true;
}
return isValid;
}
public static boolean isEditTextContainEmail(EditText argEditText) {
try {
Pattern pattern = Pattern.compile("^[_A-Za-z0-9-]+(\\.[_A-Za-z0-9-]+)*@[A-Za-z0-9]+(\\.[A-Za-z0-9]+)*(\\.[A-Za-z]{2,})$");
Matcher matcher = pattern.matcher(argEditText.getText());
return matcher.matches();
} catch (Exception e) {
e.printStackTrace();
return false;
}
}
如果你有任何疑问,请告诉我。
这是我创建的一个样例方法,用于验证电子邮件地址。如果传递的字符串参数是有效的电子邮件地址,则返回true,否则返回false。
private boolean validateEmailAddress(String emailAddress){
String expression="^[\\w\\-]([\\.\\w])+[\\w]+@([\\w\\-]+\\.)+[A-Z]{2,4}$";
CharSequence inputStr = emailAddress;
Pattern pattern = Pattern.compile(expression,Pattern.CASE_INSENSITIVE);
Matcher matcher = pattern.matcher(inputStr);
return matcher.matches();
}
试试这个
public static final Pattern EMAIL_ADDRESS_PATTERN = Pattern.compile(
"[a-zA-Z0-9\\+\\.\\_\\%\\-\\+]{1,256}" +
"\\@" +
"[a-zA-Z0-9][a-zA-Z0-9\\-]{0,64}" +
"(" +
"\\." +
"[a-zA-Z0-9][a-zA-Z0-9\\-]{0,25}" +
")+"
);
在编辑文本中
final String emailText = email.getText().toString();
EMAIL_ADDRESS_PATTERN.matcher(emailText).matches()