What Is an Android Filter?


Quick Answer

In Android development, a filter is an object that constrains data using a filtering pattern. In normal use, Android developers extend the base Android SDK Filter class, overriding the class methods and adding implementations according to their own data filtering requirements.

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Full Answer

In practice, filters are often used to implement functionality for searching through or constraining data sets within Android apps. The Android SDK contains numerous in-built classes that extend the basic Filter class with common functionality, such as InputFilter. A typical use case for an InputFilter subclass would be for limiting the types of characters that can be entered into text fields in an app, such as a login field where acceptable user names may only contain alphanumeric characters.

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