Butterknife 简单使用

介绍

Activity中使用@Bind来对id进行绑定。

class ExampleActivity extends Activity {  @Bind(R.id.title) TextView title;  @Bind(R.id.subtitle) TextView subtitle;  @Bind(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...  }}

在Fragment中使用：

public class FancyFragment extends Fragment {  @Bind(R.id.button1) Button button1;  @Bind(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;  }}

在ViewHolder中使用：

public class MyAdapter extends BaseAdapter {  @Override public View getView(int position, View view, ViewGroup parent) {    ViewHolder holder;    if (view != null) {      holder = (ViewHolder) view.getTag();    } else {      view = inflater.inflate(R.layout.whatever, parent, false);      holder = new ViewHolder(view);      view.setTag(holder);    }    holder.name.setText("John Doe");    // etc...    return view;  }  static class ViewHolder {    @Bind(R.id.title) TextView name;    @Bind(R.id.job_title) TextView jobTitle;    public ViewHolder(View view) {      ButterKnife.bind(this, view);    }  }}

绑定时机：

1. 在 activity 中使用 ButterKnife.bind(this, activity)，进行绑定。
2. Bind a view's children into fields using ButterKnife.bind(this).
3. 自定义view中在onFinishInflate() 进行绑定。

多个View或者数组等进行绑定：

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

The apply method allows you to act on all the views in a list at once.

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

Action and Setter interfaces allow specifying simple behavior.

static final ButterKnife.Action<View> DISABLE = new ButterKnife.Action<View>() {  @Override public void apply(View view, int index) {    view.setEnabled(false);  }};static final ButterKnife.Setter<View, Boolean> ENABLED = new ButterKnife.Setter<View, Boolean>() {  @Override public void set(View view, Boolean value, int index) {    view.setEnabled(value);  }};

An Android Property can also be used with the apply method.

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

LISTENER 绑定

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

在listener 中，所有参数可选。

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

@OnClick(R.id.submit)public void sayHi(Button button) {  button.setText("Hello!");}

多个view绑定同一个监听器

@OnClick({ R.id.door1, R.id.door2, R.id.door3 })public void pickDoor(DoorView door) {  if (door.hasPrizeBehind()) {    Toast.makeText(this, "You win!", LENGTH_SHORT).show();  } else {    Toast.makeText(this, "Try again", LENGTH_SHORT).show();  }}

自定义Views的自身的事件绑定

public class FancyButton extends Button {  @OnClick  public void onClick() {    // TODO do something!  }}

BINDING RESET

Fragment解绑

public class FancyFragment extends Fragment {  @Bind(R.id.button1) Button button1;  @Bind(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;  }  @Override public void onDestroyView() {    super.onDestroyView();    ButterKnife.unbind(this);  }}

OPTIONAL BINDINGS 可选绑定

By default, both @Bind and listener bindings are required. An exception will be thrown if the target view cannot be found.

To suppress this behavior and create an optional binding, add a @Nullable annotation to the field or method.

Note: Any annotation named @Nullable can be used for this purpose. It is encouraged to use the @Nullable annotation from Android's "support-annotations" library, see Android Tools Project.

@Nullable @Bind(R.id.might_not_be_there) TextView mightNotBeThere;@Nullable @OnClick(R.id.maybe_missing) void onMaybeMissingClicked() {  // TODO ...}

MULTI-METHOD LISTENERS

Method annotations whose corresponding listener has multiple callbacks can be used to bind to any one of them. Each annotation has a default callback that it binds to. Specify an alternate using the callback parameter.

@OnItemSelected(R.id.list_view)void onItemSelected(int position) {  // TODO ...}@OnItemSelected(value = R.id.maybe_missing, callback = NOTHING_SELECTED)void onNothingSelected() {  // TODO ...}

BONUS 额外的

Also included are findById methods which simplify code that still has to find views on a View, Activity, or Dialog. It uses generics to infer the return type and automatically performs the cast.

View view = LayoutInflater.from(context).inflate(R.layout.thing, null);TextView firstName = ButterKnife.findById(view, R.id.first_name);TextView lastName = ButterKnife.findById(view, R.id.last_name);ImageView photo = ButterKnife.findById(view, R.id.photo);Add a static import for ButterKnife.findById and enjoy even more fun.

MAVEN 配置

<dependency>  <groupId>com.jakewharton</groupId>  <artifactId>butterknife</artifactId>  <version>7.0.1</version></dependency>

GRADLE配置

compile 'com.jakewharton:butterknife:7.0.1'

Be sure to suppress this lint warning in your build.gradle.

lintOptions {
disable 'InvalidPackage'
}
Some configurations may also require additional exclusions.

packagingOptions {
exclude 'META-INF/services/javax.annotation.processing.Processor'
}

混淆配置

-keep class butterknife.** { *; }-dontwarn butterknife.internal.**-keep class **$$ViewBinder { *; }-keepclasseswithmembernames class * {    @butterknife.* <fields>;}-keepclasseswithmembernames class * {    @butterknife.* <methods>;}

原文是其官方文档： http://jakewharton.github.io/butterknife/