如何在android中进行表单验证

我有一份注册表，需要在提交前进行验证。该表格包含以下字段：姓名、电子邮件、联系电话和密码。我需要名称有一个值，电子邮件有正确的格式，联系电话应该是至少 10 个数字的数字，密码至少有 6 个字符。

try this

vUsername = etUsername.getText().toString();
vFirstname = etFirstname.getText().toString();
vEmail = etEmail.getText().toString(); 
vPwd = etPwd.getText().toString();
vCpwd = etCpwd.getText().toString();   

if("".equalsIgnoreCase(vUsername) //vUsername.equalsIgnoreCase("") could lead to NPE
   || "".equalsIgnoreCase(vFirstname)
   || "".equalsIgnoreCase(vEmail)
   || "".equalsIgnoreCase(vPwd)
   || "".equalsIgnoreCase(vCpwd) )
{
    Toast.makeText(userRegistration.this, "All Fields Required.", 
         Toast.LENGTH_SHORT).show();
}
checkemail(vEmail);
if(emailcheck==true)
{
    // your code here
}

public void checkemail(String email)
{
    Pattern pattern = Pattern.compile(".+@.+\\.[a-z]+");
    Matcher matcher = pattern.matcher(email);
    emailcheck = matcher.matches();
}