Validator for Android

This is a library of validators for View of Android. Some classes wrap the apache commons validator.

Usage

This library consists of classes and the class to perform them to set the validator to View.

Here is an example of Activity:

// Validators
Validators mValidators = new Validators();

EditText mTextPersonName;
EditText mTextPassword;
Button mButton;

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    mTextPersonName = (EditText) findViewById(R.id.textPersonName);
    mTextPassword = (EditText) findViewById(R.id.textPassword);
    mButton = findViewByIdAndCast(v, R.id.button);

    // Define validators for views
    mValidators.put(mTextPersonName, new Validator[] {
                new RequiredValidator("Be sure to input. "),
                new MaxLengthValidator(30, "Being allowed is to 30 characters. "),
    });
    mValidators.put(mTextPassword, new Validator[] {
                new RequiredValidator("Be sure to input. "),
                new RangeValidator(8, 16, "Being allowed is from 8 to 16 characters. "),
    });

    mButton.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                // Execute Validators
                mValidators.clearError();
                if (mValidators.isValid()) {
                    Toast.makeText(getApplicationContext(), "It has some errors. ", Toast.LENGTH_SHORT).show();
                }
            }
        });    
}

Custom Validator

You can create your own Validator. It can be done by extending the BaseValidator.

public class CustomValidator extends BaseValidator {

    // Argument of the constructor is the error message.
    public CustomValidator(final String errorMessage) {
        super(errorMessage);
    }

    @Override
    protected boolean condition(String value) {
        // Here, you will write a check condition.
        return false;
    }

}

ValidatableEditText

You can use ValidatableEditText. It is extended to EditText, has the validator.

Here is an example of layout.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:validator="http://schemas.android.com/apk/res-auto/net.granoeste.validator"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <net.granoeste.validator.ValidatableEditText
        android:id="@+id/textPersonName"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        validator:message="PersonName is required "
        validator:required="true" />

    <net.granoeste.validator.ValidatableEditText
        android:id="@+id/textPassword"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        validator:label="@string/textPassword"
        validator:minlength="8"
        validator:required="true" />

</LinearLayout>

Here is an example of Activity:

// Validators
Validators mValidators = new Validators();

net.granoeste.validator.ValidatableEditText mTextPersonName;
net.granoeste.validator.ValidatableEditText mTextPassword;
Button mButton;

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    mTextPersonName = (net.granoeste.validator.ValidatableEditText) findViewById(R.id.textPersonName);
    mTextPassword = (net.granoeste.validator.ValidatableEditText) findViewById(R.id.textPassword);
    mButton = findViewByIdAndCast(v, R.id.button);

    // add ValidatableEditText to Validators
    mValidators.put(mTextPersonName);
    mValidators.put(mTextEmailAddress);

    mButton.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                // Execute Validators
                mValidators.clearError();
                if (mValidators.isValid()) {
                    Toast.makeText(getApplicationContext(), "It has some errors. ", Toast.LENGTH_SHORT).show();
                }
            }
        });    
}

License

• Apache Version 2.0

Known

• Some classes wrap the apache commons validator.
• This uses the Jakarta-ORO