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ButterKnife是一个Android View注入的库。
在使用ButterKnife需要先配置一下Eclipse。
项目右键-Properties-Java Complier-Annotation Processing 确保设置和下图一致
接着展开Annotation Processing选择Factory Path,选中Enable project specific settings。然后点击 Add JARs…,选中ButterKnife的jar包
然后点击ok保存设置，Eclipse将问你是否重新构建新项目，点击Yes。
确保你项目的根目录里有一个.apt_generated的文件夹，文件夹中包含YOURACTIVITY$$ViewInjector.java这样的文件。
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class ExampleActivity extends Activity { @InjectView(R.id.title) TextView title; @InjectView(R.id.subtitle) TextView subtitle; @InjectView(R.id.footer) TextView footer; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.simple_activity); ButterKnife.inject(this); // TODO Use "injected" views... }} |
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public class FancyFragment extends Fragment { @InjectView(R.id.button1) Button button1; @InjectView(R.id.button2) Button button2; @Override View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View view = inflater.inflate(R.layout.fancy_fragment, container, false); ButterKnife.inject(this, view); // TODO Use "injected" views... return view; }} |
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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 convertView; } static class ViewHolder { @InjectView(R.id.title) TextView name; @InjectView(R.id.job_title) TextView jobTitle; public ViewHolder(View view) { ButterKnife.inject(this, view); } }} |
点击事件注入
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@OnClick(R.id.submit)public void sayHi(Button button) { button.setText("Hello!");} |
多个控件具有相同的事件
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@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(); }} |
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public class FancyFragment extends Fragment { @InjectView(R.id.button1) Button button1; @InjectView(R.id.button2) Button button2; @Override View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View view = inflater.inflate(R.layout.fancy_fragment, container, false); ButterKnife.inject(this, view); // TODO Use "injected" views... return view; } @Override void onDestroyView() { super.onDestroyView(); ButterKnife.reset(this); }} |
默认情况下@InjectView和@OnClick注入是必选的，如果view未找到将出现异常。为了避免出现异常，添加一个@Optional注解。
ButterKnife还包含了两个findById方法。
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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); |
为避免混淆的时代码被移除，所以要在proguard-project.txt中添加如下代码避免混淆
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-dontwarn butterknife.internal.**-keep class **$$ViewInjector { *; }-keepnames class * { @butterknife.InjectView *;} |
注，在windows下，某些eclipse版本无法选择 Compiler/Annotation Processing"。下面是两个版本的比较。
adt-bundle-windows-x86_64-20140702 (较新的版本，不可以)
adt-bundle-windows-x86_64-20131030 (2013年的版本，可以)
原因是谷歌在bundled版本中移除了Annotation Processing 选项，目的是为了锁定到他们自己新出的注解系统中： /extras/android/support/annotations/android-support-annotations.jar
github上的解决办法是安装如下图所示的东西：
当然换成android studio应该更好解决。
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原文地址：http://www.cnblogs.com/exmyth/p/4779763.html
