Android ----- butterknife框架使用

介绍

butterknife也是一个依赖注入框架，借助annonation实现view的快速初始化，解除findViewById的烦恼

工程引入

配置项目根目录的build.gradle，来引入android-apt插件

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buildscript {  repositories {    mavenCentral()   }  dependencies {    classpath 'com.neenbedankt.gradle.plugins:android-apt:1.8'  }}

配置app的build.gradle

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

}

配置module的build.gradle,apply the android-apt plugin,and add the Butter Knifedependencies.

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apply plugin: 'android-apt`android{...}dependencies{ compile 'com.jakewharton:butterknife:8.2.1' apt 'com.jakewharton:butterknife-compiler:8.2.1'}

注意
butter knife尽量不要在library中使用，如果要用，还得转R2,太麻烦了

使用

打开Android studio 左上角File-settings-选择Plugins搜索Android ButterKnife Zelezny然后安装重新启动android studio

setContentView(R.layout.activity_main);

在activity_main中右键Generate选择Generate ButterKnife Injections

使用@BindView注解view

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class ExampleActivity extends Activity {  @BindView(R.id.title) TextView title;  @BindView(R.id.subtitle) TextView subtitle;  @BindView(R.id.footer) TextView footer;  @Override public void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.simple_activity);    ButterKnife.bind(this);    // TODO Use fields...  }}

Resource的注解

@BindBool, @BindColor, @BindDimen, @BindDrawable, @BindInt, @BindString

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class ExampleActivity extends Activity {  @BindString(R.string.title) String title;  @BindDrawable(R.drawable.graphic) Drawable graphic;  @BindColor(R.color.red) int red; // int or ColorStateList field  @BindDimen(R.dimen.spacer) Float spacer; // int (for pixel size) or float (for exact value) field  // ...}

non-activity的注解

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public class FancyFragment extends Fragment {  @BindView(R.id.button1) Button button1;  @BindView(R.id.button2) Button button2;  @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {    View view = inflater.inflate(R.layout.fancy_fragment, container, false);    ButterKnife.bind(this, view);    // TODO Use fields...    return view;  }}

也可以在ViewHolder中使用

View List

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@BindViews({ R.id.first_name, R.id.middle_name, R.id.last_name })List<EditText> nameViews;

使用apply方法，能一次操作整个View的List

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ButterKnife.apply(nameViews, DISABLE);ButterKnife.apply(nameViews, ENABLED, false);

包括设置属性

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ButterKnife.apply(nameViews, View.ALPHA, 0.0f);

Listener的绑定

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@OnClick(R.id.submit)public void submit(View view) {  // TODO submit data to server...}

绑定的释放

由于Fragment的生命周期区别于activity，当我们在Fragment的onCreatView做绑定的时候，要在onDestoryView中设置views为null。Butter Knife 返回一个Unbider实例来解决这个问题，
eg:

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public class FancyFragment extends Fragment {  @BindView(R.id.button1) Button button1;  @BindView(R.id.button2) Button button2;  private Unbinder unbinder;  @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {    View view = inflater.inflate(R.layout.fancy_fragment, container, false);    unbinder = ButterKnife.bind(this, view);    // TODO Use fields...    return view;  }  @Override public void onDestroyView() {    super.onDestroyView();    unbinder.unbind();  }}

更懒的方式

参考：http://www.jianshu.com/p/9ad21e548b69