Android How can I validate EditText input

Question

I need to do form input validation on a series of EditTexts  I m using OnFocusChangeListeners to trigger the validation after the user types into each one  but this doesn t behave as desired for the last EditText   If I click on the  Done  button while typing into the final EditText then the InputMethod is disconnected  but technically focus is never lost on the EditText  and so validation never occurs    What s the best solution   Should I be monitoring when the InputMethod unbinds from each EditText rather than when focus changes  If so  how

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Updated approach - TextInputLayout   Google has recently launched design support library and there is one component called TextInputLayout and it supports showing an error via setErrorEnabled boolean  and setError CharSequence    How to use it   Step 1  Wrap your EditText with TextInputLayout      lt android support design widget TextInputLayout     android layout width  match parent      android layout height  wrap content      android id    id layoutUserName  gt        lt EditText       android layout width  match parent        android layout height  wrap content        android hint  hint        android id    id editText1    gt      lt  android support design widget TextInputLayout gt    Step 2  Validate input     validating input on a button click public void btnValidateInputClick View view         final TextInputLayout layoutUserName    TextInputLayout  findViewById R id layoutUserName       String strUsername   layoutLastName getEditText   getText   toString         if  TextUtils isEmpty strLastName             Snackbar make view  strUsername  Snackbar LENGTH SHORT  show            layoutUserName setErrorEnabled false         else           layoutUserName setError  Input required            layoutUserName setErrorEnabled true             I have created an example over my Github repository  checkout the example if you wish to

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If you want nice validation popups and images when an error occurs you can use the setError method of the EditText class as I describe here

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for email and password validation try    if  isValidEmail et regemail getText   toString    amp  amp etpass1 getText   toString   length   gt 7         if  validatePassword etpass1 getText   toString             Toast makeText getApplicationContext    Go Ahead                     else          Toast makeText getApplicationContext    InvalidPassword                  else    Toast makeText getApplicationContext    Invalid Email           public boolean validatePassword final String password       Pattern pattern      Matcher matcher      final String PASSWORD PATTERN           0-9        A-Z                    amp           S     4          pattern   Pattern compile PASSWORD PATTERN       matcher   pattern matcher password        return matcher matches       public final static boolean isValidEmail CharSequence target        if  target    null          return false       return android util Patterns EMAIL ADDRESS matcher target  matches

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Why don t you use TextWatcher    Since you have a number of EditText boxes to be validated  I think the following shall suit you     Your activity implements android text TextWatcher interface You add TextChanged listeners to you EditText boxes   txt1 addTextChangedListener this   txt2 addTextChangedListener this   txt3 addTextChangedListener this      Of the overridden methods  you could use the afterTextChanged Editable s  method as follows    Override public void afterTextChanged Editable s           validation code goes here     The Editable s doesn t really help to find which EditText box s text is being changed  But you could directly check the contents of the EditText boxes like  String txt1String   txt1 getText   toString       Validate txt1String   in the same method  I hope I m clear and if I am  it helps      EDIT  For a cleaner approach refer to Christopher Perry s answer below

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This was nice solution from here  InputFilter filter  new InputFilter          public CharSequence filter CharSequence source  int start  int end  Spanned dest  int dstart  int dend             for  int i   start  i  lt  end  i                   String checkMe   String valueOf source charAt i                 Pattern pattern   Pattern compile   ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz123456789                   Matcher matcher   pattern matcher checkMe               boolean valid   matcher matches                if  valid                   Log d      invalid                    return                                      return null              edit setFilters new InputFilter   filter

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I find InputFilter to be more appropriate to validate text inputs on android    Here s a simple example  How do I use InputFilter to limit characters in an EditText in Android   You could add a Toast to feedback the user about your restrictions  Also check the android inputType tag out

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You can get desired behavior by listening when user hit  Done  button on keyboard  also checkout other tips about working with EditText in my post  Android form validation - the right way   Sample code   mTextView setOnEditorActionListener new TextView OnEditorActionListener          Override     public boolean onEditorAction TextView view  int actionId  KeyEvent event            if  actionId    EditorInfo IME ACTION DONE                                    validateAndSubmit                return true                    return false

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This looks really promising and just what the doc ordered for me  EditText Validator     public void onClickNext View v        FormEditText   allFields        etFirstname  etLastname  etAddress  etZipcode  etCity                  boolean allValid   true      for  FormEditText field  allFields            allValid   field testValidity    amp  amp  allValid                 if  allValid               YAY       else              EditText are going to appear with an exclamation mark and an explicative message           custom validators plus these built in   regexp  for custom regexp numeric  for an only numeric field alpha  for an alpha only field alphaNumeric  guess what  personName  checks if the entered text is a person first or last name  personFullName  checks if the entered value is a complete full name  email  checks that the field is a valid email creditCard  checks that the field contains a valid credit card using Luhn Algorithm phone  checks that the field contains a valid phone number domainName  checks that field contains a valid domain name   always passes the test in API Level  lt  8   ipAddress  checks that the field contains a valid ip address webUrl  checks that the field contains a valid url   always passes the test in API Level  lt  8   date  checks that the field is a valid date datetime format   if customFormat is set  checks with customFormat   nocheck  It does not check anything except the emptyness of the field

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I have created this library for android where you can validate a material design EditText inside and EditTextLayout easily like this       compile  com github TeleClinic SmartEditText 0 1 0    then you can use it like this    lt com teleclinic kabdo smartmaterialedittext CustomViews SmartEditText     android id    id passwordSmartEditText      android layout width  match parent      android layout height  wrap content      app setLabel  Password      app setMandatoryErrorMsg  Mandatory field      app setPasswordField  true      app setRegexErrorMsg  Weak password      app setRegexType  MEDIUM PASSWORD VALIDATION    gt    lt com teleclinic kabdo smartmaterialedittext CustomViews SmartEditText     android id    id ageSmartEditText      android layout width  match parent      android layout height  wrap content      app setLabel  Age      app setMandatoryErrorMsg  Mandatory field      app setRegexErrorMsg  Is that really your age  D       app setRegexString      d      gt    Then you can check if it is valid like this       ageSmartEditText check     For more examples and customization check the repository https   github com TeleClinic SmartEditText

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I needed to do intra-field validation and not inter-field validation to test that my values were unsigned floating point values in one case and signed floating point values in another   Here s what seems to work for me        lt EditText         android id    id x           android background   android drawable editbox background           android gravity  right           android inputType  numberSigned numberDecimal         gt    Note  you must not have any spaces inside  numberSigned numberDecimal    For example   numberSigned   numberDecimal  won t work   I m not sure why

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I wrote a class that extends EditText which supports natively some validation methods and is actually very flexible    Current  as I write   natively supported through xml attributes validation methods are    alpha alpha numeric numeric generic regexp string emptyness   You can check it out here   Hope you enjoy it

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In order to reduce the verbosity of the validation logic I have authored a library for Android  It takes care of most of the day to day validations using Annotations and built-in rules  There are constraints such as  TextRule   NumberRule   Required   Regex   Email   IpAddress   Password  etc    You can add these annotations to your UI widget references and perform validations  It also allows you to perform validations asynchronously which is ideal for situations such as checking for unique username from a remote server   There is a example on the project home page on how to use annotations  You can also read the associated blog post where I have written sample codes on how to write custom rules for validations   Here is a simple example that depicts the usage of the library    Required order   1   Email order   2  private EditText emailEditText    Password order   3   TextRule order   4  minLength   6  message    Enter at least 6 characters    private EditText passwordEditText    ConfirmPassword order   5  private EditText confirmPasswordEditText    Checked order   6  message    You must agree to the terms    private CheckBox iAgreeCheckBox    The library is extendable  you can write your own rules by extending the Rule class

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TextWatcher is a bit verbose for my taste  so I made something a bit easier to swallow   public abstract class TextValidator implements TextWatcher       private final TextView textView       public TextValidator TextView textView            this textView   textView             public abstract void validate TextView textView  String text         Override     final public void afterTextChanged Editable s            String text   textView getText   toString            validate textView  text               Override     final public void beforeTextChanged CharSequence s  int start  int count  int after       Don t care            Override     final public void onTextChanged CharSequence s  int start  int before  int count       Don t care          Just use it like this   editText addTextChangedListener new TextValidator editText         Override public void validate TextView textView  String text              Validation code here

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In main xml file  You can put the following attrubute to validate only alphabatics character can accept in edittext   Do this      android entries  abcdefghijklmnopqrstuvwxyz

[android] Android: How can I validate EditText input?

Updated approach - TextInputLayout:

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Examples related to android-edittext