Butter Knife

View "injection" library for Android which uses annotation processing to generate boilerplate code for you.

• Eliminate findViewById calls by using @InjectView on fields.
• Group multiple views in a list using @InjectViews. Operate on all of them at once with actions, setters, or properties.
• Eliminate anonymous inner-classes for listeners by annotating methods with @OnClick and others.

class ExampleActivity extends Activity {
  @InjectView(R.id.user) EditText username;
  @InjectView(R.id.pass) EditText password;

  @OnClick(R.id.submit) void submit() {
    // TODO call server...
  }

  @Override public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.simple_activity);
    ButterKnife.inject(this);
    // TODO Use "injected" views...
  }
}

For documentation and additional information see the website.

Remember: A butter knife is like a dagger only infinitely less sharp.

Download

Download the latest JAR or grab via Maven:

<dependency>
  <groupId>com.jakewharton</groupId>
  <artifactId>butterknife</artifactId>
  <version>5.1.0</version>
</dependency>

or Gradle:

compile 'com.jakewharton:butterknife:5.1.0'

License

Copyright 2013 Jake Wharton

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

   http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.