jakewharton/butterknife

Butter Knife was an Android library that reduced repetitive boilerplate code when connecting a user interface layout (the visual elements of an Android screen) to the Java code that controls them. In Android development, developers traditionally had to write many lines of "findViewById" calls, code that searches through the UI layout to locate each button, text box, or image by its ID, then assigns it to a variable. Butter Knife replaced all of that with simple annotations (labels you add directly above a variable or method). For example, instead of writing multi-line lookup code for a text field, you would place "@BindView" above a variable and Butter Knife would wire everything up automatically at compile time, generating the repetitive code for you behind the scenes using a technique called annotation processing. Similarly, instead of creating anonymous listener objects to respond to button clicks, you could annotate a method with "@OnClick" and that method would be called automatically when the button was tapped. Note: Butter Knife is now officially deprecated. Google has since built a native replacement called view binding directly into Android, which accomplishes the same goal more safely and without a third-party library. Existing code using Butter Knife will continue to work, but new projects should use view binding instead. The tech stack is Java.