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JakeWharton

Description

Bind Android views and callbacks to fields and methods.

25.5K Stars 4.7K Forks Apache License 2.0 1.0K Commits 113 Opened issues

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Butter Knife

Attention: This tool is now deprecated. Please switch to view binding. Existing versions will continue to work, obviously, but only critical bug fixes for integration with AGP will be considered. Feature development and general bug fixes have stopped.

Logo

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.

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android {
  ...
  // Butterknife requires Java 8.
  compileOptions {
    sourceCompatibility JavaVersion.VERSION_1_8
    targetCompatibility JavaVersion.VERSION_1_8
  }
}

dependencies { implementation 'com.jakewharton:butterknife:10.2.3' annotationProcessor 'com.jakewharton:butterknife-compiler:10.2.3' }

If you are using Kotlin, replace

annotationProcessor
with
kapt
.

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()
    google()
  }
  dependencies {
    classpath 'com.jakewharton:butterknife-gradle-plugin:10.2.3'
  }
}

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.

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