Awesome

AwesomeValidation

Introduction

Implement validation for Android within only 3 steps. Developers should focus on their awesome code, and let the library do the boilerplate. And what's more, this could help keep your layout file clean.

Steps

Declare validation style;
Add validations;
Set a point when to trigger validation.

Sample code

// Step 1: designate a style
AwesomeValidation mAwesomeValidation = new AwesomeValidation(BASIC);
// or
AwesomeValidation mAwesomeValidation = new AwesomeValidation(COLORATION);
mAwesomeValidation.setColor(Color.YELLOW);  // optional, default color is RED if not set
// or
AwesomeValidation mAwesomeValidation = new AwesomeValidation(UNDERLABEL);
mAwesomeValidation.setContext(this);  // mandatory for UNDERLABEL style
// setUnderlabelColor is optional for UNDERLABEL style, by default it's holo_red_light
mAwesomeValidation.setUnderlabelColorByResource(android.R.color.holo_orange_light); // optional for UNDERLABEL style
mAwesomeValidation.setUnderlabelColor(ContextCompat.getColor(this, android.R.color.holo_orange_dark)); // optional for UNDERLABEL style
// or
AwesomeValidation mAwesomeValidation = new AwesomeValidation(TEXT_INPUT_LAYOUT);
mAwesomeValidation.setTextInputLayoutErrorTextAppearance(R.style.TextInputLayoutErrorStyle); // optional, default color is holo_red_light if not set
// by default, it automatically sets focus to the first failed input field after validation is triggered
// you can disable this behavior by
AwesomeValidation.disableAutoFocusOnFirstFailure();

// Step 2: add validations
// support regex string, java.util.regex.Pattern and Guava#Range
// you can pass resource or string
mAwesomeValidation.addValidation(activity, R.id.edt_name, "[a-zA-Z\\s]+", R.string.err_name);
mAwesomeValidation.addValidation(activity, R.id.edt_tel, RegexTemplate.TELEPHONE, R.string.err_tel);
mAwesomeValidation.addValidation(activity, R.id.edt_email, android.util.Patterns.EMAIL_ADDRESS, R.string.err_email);
mAwesomeValidation.addValidation(activity, R.id.edt_year, Range.closed(1900, Calendar.getInstance().get(Calendar.YEAR)), R.string.err_year);
mAwesomeValidation.addValidation(activity, R.id.edt_height, Range.closed(0.0f, 2.72f), R.string.err_height);
// or
mAwesomeValidation.addValidation(editText, "regex", "Error info");

// to validate TextInputLayout, pass the TextInputLayout, not the embedded EditText
AwesomeValidation mAwesomeValidation = new AwesomeValidation(TEXT_INPUT_LAYOUT);
mAwesomeValidation.addValidation(activity, R.id.til_email, Patterns.EMAIL_ADDRESS, R.string.err_email);

// to validate the confirmation of another field
String regexPassword = "(?=.*[a-z])(?=.*[A-Z])(?=.*[\\d])(?=.*[~`!@#\\$%\\^&\\*\\(\\)\\-_\\+=\\{\\}\\[\\]\\|\\;:\"<>,./\\?]).{8,}";
mAwesomeValidation.addValidation(activity, R.id.edt_password, regexPassword, R.string.err_password);
// to validate a confirmation field (don't validate any rule other than confirmation on confirmation field)
mAwesomeValidation.addValidation(activity, R.id.edt_password_confirmation, R.id.edt_password, R.string.err_password_confirmation);

// to validate with a simple custom validator function
mAwesomeValidation.addValidation(activity, R.id.edt_birthday, new SimpleCustomValidation() {
    @Override
    public boolean compare(String input) {
        // check if the age is >= 18
        try {
            Calendar calendarBirthday = Calendar.getInstance();
            Calendar calendarToday = Calendar.getInstance();
            calendarBirthday.setTime(new SimpleDateFormat("dd/MM/yyyy", Locale.US).parse(input));
            int yearOfToday = calendarToday.get(Calendar.YEAR);
            int yearOfBirthday = calendarBirthday.get(Calendar.YEAR);
            if (yearOfToday - yearOfBirthday > 18) {
                return true;
            } else if (yearOfToday - yearOfBirthday == 18) {
                int monthOfToday = calendarToday.get(Calendar.MONTH);
                int monthOfBirthday = calendarBirthday.get(Calendar.MONTH);
                if (monthOfToday > monthOfBirthday) {
                    return true;
                } else if (monthOfToday == monthOfBirthday) {
                    if (calendarToday.get(Calendar.DAY_OF_MONTH) >= calendarBirthday.get(Calendar.DAY_OF_MONTH)) {
                        return true;
                    }
                }
            }
        } catch (ParseException e) {
            e.printStackTrace();
        }
        return false;
    }
}, R.string.err_birth);

// to validate with your own custom validator function, warn and clear the warning with your way
mAwesomeValidation.addValidation(activity, R.id.spinner_tech_stacks, new CustomValidation() {
    @Override
    public boolean compare(ValidationHolder validationHolder) {
        if (((Spinner) validationHolder.getView()).getSelectedItem().toString().equals("< Please select one >")) {
            return false;
        } else {
            return true;
        }
    }
}, new CustomValidationCallback() {
    @Override
    public void execute(ValidationHolder validationHolder) {
        TextView textViewError = (TextView) ((Spinner) validationHolder.getView()).getSelectedView();
        textViewError.setError(validationHolder.getErrMsg());
        textViewError.setTextColor(Color.RED);
    }
}, new CustomErrorReset() {
    @Override
    public void reset(ValidationHolder validationHolder) {
        TextView textViewError = (TextView) ((Spinner) validationHolder.getView()).getSelectedView();
        textViewError.setError(null);
        textViewError.setTextColor(Color.BLACK);
    }
}, R.string.err_tech_stacks);

// Step 3: set a trigger
findViewById(R.id.btn_done).setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        mAwesomeValidation.validate();
    }
});

// Optional: remove validation failure information
findViewById(R.id.btn_clr).setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        mAwesomeValidation.clear();
    }
});

Attention

It works perfectly with Fragment, but please pay attention to Fragment's lifecycle. You should set the validate() inside Fragment's onActivityCreated instead of onCreateView or any other early stage.
UNDERLABEL validation style doesn't support ConstraintLayout at the moment, please use other validation styles. There is an open issue here.

Import as dependency

For Gradle it's easy - just add below to your module's build.gradle (it's available on Maven Central):

dependencies {
    implementation 'com.basgeekball:awesome-validation:4.3'
}

Alternatively, it's also available on JitPack:

Add it in your root build.gradle at the end of repositories:

allprojects {
    repositories {
        ...
        maven { url 'https://jitpack.io' }
    }
}

Add the dependency

dependencies {
    implementation 'com.github.thyrlian:AwesomeValidation:v4.3'
    // you can also use the short commit hash to get a specific version
    // implementation 'com.github.thyrlian:AwesomeValidation:GIT_COMMIT_HASH'
}

Screenshots

Release guide

Update version number in build.gradle, gradle.properties and README
Create new git tag: v*.*
Make sure a local.properties file which holds the necessary credentials is present under the library directory
Run ./gradlew clean build && ./gradlew :library:publishReleasePublicationToSonatypeRepository to generate release file and upload it to Nexus Repository