Butter Knife

Additional

Language
Java
Version
butterknife-parent-7.0.1 (Jun 30, 2015)
Created
Mar 5, 2013
Updated
Feb 17, 2017
Owner
Jake Wharton (JakeWharton)
Contributors
egor-n
Leonardo Taehwan Kim (TheFinestArtist)
f2prateek
Artem Zinnatullin (artem-zinnatullin)
lexs
swanson
Felipe Lima (felipecsl)
solcott
Bananeweizen
孙善明 (yaming116)
Frankie Sardo (frankiesardo)
aried3r
mlc
Gautam Korlam (kageiit)
imminent
ChristianBecker
Simon Vig Therkildsen (SimonVT)
Boris Korogvich (VEINHORN)
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Butter Knife

Field and method binding for Android views which uses annotation processing to generate boilerplate code for you.

  • Eliminate findViewById calls by using @BindView on fields.
  • Group multiple views in a list or array. 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.
  • Eliminate resource lookups by using resource annotations on fields.
class ExampleActivity extends Activity {
  @BindView(R.id.user) EditText username;
  @BindView(R.id.pass) EditText password;

  @BindString(R.string.login_error) String loginErrorMessage;

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

  @Override public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.simple_activity);
    ButterKnife.bind(this);
    // TODO Use fields...
  }
}

For documentation and additional information see the website.

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

Download

dependencies {
  compile 'com.jakewharton:butterknife:8.5.1'
  annotationProcessor 'com.jakewharton:butterknife-compiler:8.5.1'
}

Snapshots of the development version are available in Sonatype's snapshots repository.

Library projects

To use Butter Knife in a library, add the plugin to your buildscript:

buildscript {
  repositories {
    mavenCentral()
   }
  dependencies {
    classpath 'com.jakewharton:butterknife-gradle-plugin:8.5.1'
  }
}

and then apply it in your module:

apply plugin: 'com.android.library'
apply plugin: 'com.jakewharton.butterknife'

Now make sure you use R2 instead of R inside all Butter Knife annotations.

class ExampleActivity extends Activity {
  @BindView(R2.id.user) EditText username;
  @BindView(R2.id.pass) EditText password;
...
}

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.