欠伸展肢体，吟咏心自愉。这篇文章主要讲述安卓开发懒鬼最爱之ButterKnife，依赖注入第三方是库，进一步加速开发速度相关的知识，希望能为你提供帮助。
转载请注明出处：王亟亟的大牛之路还在烦躁一大堆findById的控件操作而烦恼么？平时，我们的那一系列findById是一个“浩大的project”样比例如以下
这是以前一个项目的一个填童虎数据表单的一个Activity，这是一系列的声明

public class UserInfoActivity extends Activity implements OnClickListener { TextView userNameTxt; RelativeLayout sexLayout; TextView sexTxt; RelativeLayout birthdayLayout; TextView birthdayTxt; RelativeLayout provinceLayout; TextView provinceTxt; RelativeLayout cityLayout; TextView cityTxt; RelativeLayout hasCarCardLayout; TextView hasCarCardTxt; RelativeLayout hasCarLayout; TextView hasCarTxt; RelativeLayout buyCarTimeLayout; TextView buyCarTimeTxt; RelativeLayout carBrandLayout; TextView carBrandTxt; RelativeLayout carTypeLayout; TextView carTypeTxt; RelativeLayout carPriceLayout; TextView carPriceTxt; RelativeLayout carCardNumLayout; TextView carCardNumTxt; RelativeLayout carNumLayout; TextView carNumTxt; RelativeLayout familyIncomeLayout; TextView familyIncomeTxt; RelativeLayout carCarImgLayout; ImageView carCarImg; RelativeLayout drivingLicenseLayout; ImageView drivingLicenseImg; LinearLayout backLin; LinearLayout saveBtn; RelativeLayout userNameLayout; LinearLayout sexLinLayout; LinearLayout birthdayLinLayout; LinearLayout provinceLinLayout; LinearLayout cityLinLayout; LinearLayout carCarLinLayout; LinearLayout hasCarLinLayout; LinearLayout buyCarTimeLinLayout; LinearLayout carBrandLinLayout; LinearLayout carTypeLinLayout; LinearLayout carPriceLinLayout; LinearLayout carCardNumLinLayout; LinearLayout carNumLinLayout; LinearLayout familiIncomeLinLayout; LinearLayout carCardImageLinLayout; LinearLayout drivindLicenseLinLayout; LinearLayout professionLinLayout; LinearLayout carInfoLayout; TextView professionTv;

这是一大堆的findById

backLin = (LinearLayout) titleView.findViewById(R.id.backLin); saveBtn = (LinearLayout) titleView.findViewById(R.id.saveBtn); userNameLayout = (RelativeLayout) contentView .findViewById(R.id.userNameLayout); userNameTxt = (TextView) contentView.findViewById(R.id.userNameTxt); sexLayout = (RelativeLayout) contentView.findViewById(R.id.sexLayout); sexTxt = (TextView) contentView.findViewById(R.id.sexTxt); birthdayLayout = (RelativeLayout) contentView .findViewById(R.id.birthdayLayout); birthdayTxt = (TextView) contentView.findViewById(R.id.birthdayTxt); provinceLayout = (RelativeLayout) contentView .findViewById(R.id.provinceLayout); provinceTxt = (TextView) contentView.findViewById(R.id.provinceTxt); cityLayout = (RelativeLayout) contentView.findViewById(R.id.cityLayout); cityTxt = (TextView) contentView.findViewById(R.id.cityTxt); hasCarCardLayout = (RelativeLayout) contentView .findViewById(R.id.carCardLayout); hasCarCardTxt = (TextView) contentView.findViewById(R.id.carCardTxt); hasCarLayout = (RelativeLayout) contentView .findViewById(R.id.hasCarLayout); hasCarTxt = (TextView) contentView.findViewById(R.id.hasCarTxt); buyCarTimeLayout = (RelativeLayout) contentView .findViewById(R.id.buyCarTimeLayout); buyCarTimeTxt = (TextView) contentView.findViewById(R.id.buyCarTimeTxt); carBrandLayout = (RelativeLayout) contentView .findViewById(R.id.carBrandLayout); carBrandTxt = (TextView) contentView.findViewById(R.id.carBrandTxt); carTypeLayout = (RelativeLayout) contentView .findViewById(R.id.carTypeLayout); carTypeTxt = (TextView) contentView.findViewById(R.id.carTypeTxt); carPriceLayout = (RelativeLayout) contentView .findViewById(R.id.carPriceLayout); carPriceTxt = (TextView) contentView.findViewById(R.id.carPriceTxt); carCardNumLayout = (RelativeLayout) contentView .findViewById(R.id.carCardNumLayout); carCardNumTxt = (TextView) contentView.findViewById(R.id.carCardNumTxt); carNumLayout = (RelativeLayout) contentView .findViewById(R.id.carNumLayout); carNumTxt = (TextView) contentView.findViewById(R.id.carNumTxt); familyIncomeLayout = (RelativeLayout) contentView .findViewById(R.id.familyIncomeLayout); familyIncomeTxt = (TextView) contentView .findViewById(R.id.familyIncomeTxt); carCarImgLayout = (RelativeLayout) contentView .findViewById(R.id.carCarImgLayout); carCarImg = (ImageView) contentView.findViewById(R.id.carCarImg); drivingLicenseLayout = (RelativeLayout) contentView .findViewById(R.id.drivingLicenseLayout); drivingLicenseImg = (ImageView) contentView .findViewById(R.id.drivingLicenseImg); sexLinLayout = (LinearLayout) contentView .findViewById(R.id.sexLinLayout); birthdayLinLayout = (LinearLayout) contentView .findViewById(R.id.birthdayLinLayout); provinceLinLayout = (LinearLayout) contentView .findViewById(R.id.provinceLinLayout); cityLinLayout = (LinearLayout) contentView .findViewById(R.id.cityLinLayout); carCarLinLayout = (LinearLayout) contentView .findViewById(R.id.carCarLinLayout); hasCarLinLayout = (LinearLayout) contentView .findViewById(R.id.hasCarLinLayout); buyCarTimeLinLayout = (LinearLayout) contentView .findViewById(R.id.buyCarTimeLinLayout); carBrandLinLayout = (LinearLayout) contentView .findViewById(R.id.carBrandLinLayout); carTypeLinLayout = (LinearLayout) contentView .findViewById(R.id.carTypeLinLayout); carPriceLinLayout = (LinearLayout) contentView .findViewById(R.id.carPriceLinLayout); carCardNumLinLayout = (LinearLayout) contentView .findViewById(R.id.carCardNumLinLayout); carNumLinLayout = (LinearLayout) contentView .findViewById(R.id.carNumLinLayout); familiIncomeLinLayout = (LinearLayout) contentView .findViewById(R.id.familiIncomeLinLayout); drivindLicenseLinLayout = (LinearLayout) contentView .findViewById(R.id.drivindLicenseLinLayout); carCardImageLinLayout = (LinearLayout) contentView .findViewById(R.id.carCardImageLinLayout); professionLinLayout = (LinearLayout) contentView .findViewById(R.id.professionLinLayout); carInfoLayout = (LinearLayout) contentView .findViewById(R.id.carInfoLayout); professionTv = (TextView) contentView.findViewById(R.id.professionTv);

看着看着蛋都碎了，简直不能忍。所以今天推荐一个简单易用的库，效果如图

文章图片

不试试非常快非常猛？轻轻点两下，这一大堆玩意都能解决！

来来来，JAR包下载：r=central-proxy& g=com.jakewharton& a=butterknife& v=LATEST">butterknife-7.0.1
Maven:

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

Gradle:

compile ‘com.jakewharton:butterknife:7.0.1‘

项目包下载地址：点击下载
Gif的功能仅仅能在androidStudio使用，Eclipse的小伙伴仅仅能手打了。。

操作方法：
Android Studio: go to Preferences → Plugins → Browse repositories and search for ButterKnife Zelezny
跟我们用图片做背景图一样，下载一个插件就好。

好。废话不多，開始拆作者的例子（楼主小学英文大致的理解讲述下）：

Annotate fields with @Bind and a view ID for Butter Knife to find and automatically cast the corresponding view in your layout.
凝视字段“绑定”和“ Butter Knife”的视图标识。并自己主动在布局中查看对应的视图。

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... } }

分析：使用 @Bind 就能够对控件进行声明，已经findViewById的操作，然后在onCreate（）方法中调用 ButterKnife.bind(this); 使之生效，假设你认为有必要的话能够在onDestory()方法中再调用ButterKnife.unbind(this); 进行解绑操作

You can also perform binding on arbitrary objects by supplying your own view root.
能够通过提供您自己的视图根试图来运行随意对象的绑定。我们能够用在fragment等用到inflater的地方。

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; } }

分析：这边与Activity的区别仅仅是在调用的方法中须要传入被绑定的那个根试图而已。

Another use is simplifying the view holder pattern inside of a list adapter.
在ListView或者其它一些用到 ViewHolder形式的地方都能够用

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); } } }

You can group multiple views into a List or array
能够把一些控件放进一个集合或者数组中

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

Listeners can also automatically be configured onto methods.
也能够自己主动将侦听器配置为方法。

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

All arguments to the listener method are optional.
全部參数的侦听器方法是可选的。

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

Define a specific type and it will automatically be cast.
定义一个特定类型，它将自己主动被转换。

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

Specify multiple IDs in a single binding for common event handling.
指定多个身ID在一个单一的绑定事件处理。

@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(); } }

自己也写了一个Demo大致内容也和范例差点儿相同。只是比較直观，能够看一下
MainActivity

public class MainActivity extends AppCompatActivity implements TestFragment.OnFragmentInteractionListener{ @Bind(R.id.textView) TextView textview; @Bind(R.id.button1) Button button1; @Bind(R.id.button2) Button button2; @Bind(R.id.button3) Button button3; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); ButterKnife.bind(this); }@Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.menu_main, menu); return true; }@Override public boolean onOptionsItemSelected(MenuItem item) { // Handle action bar item clicks here. The action bar will // automatically handle clicks on the Home/Up button, so long // as you specify a parent activity in AndroidManifest.xml. int id = item.getItemId(); //noinspection SimplifiableIfStatement if (id == R.id.action_settings) { return true; }return super.onOptionsItemSelected(item); }@OnClick(R.id.button1) public void button1click(Button btn){ btn.setText("BTN1"); }@OnClick({R.id.button1, R.id.button2, R.id.button3 }) public void click(View v) { switch (v.getId()){ case R.id.button1: Toast.makeText(this, "button1", Toast.LENGTH_SHORT).show(); break; case R.id.button2: Toast.makeText(this, "button2",Toast.LENGTH_SHORT).show(); break; case R.id.button3: Toast.makeText(this, "button3",Toast.LENGTH_SHORT).show(); break; } }@Override public void onFragmentInteraction(Uri uri) {} }

内部的fragment

public class TestFragment extends Fragment { // TODO: Rename parameter arguments, choose names that match // the fragment initialization parameters, e.g. ARG_ITEM_NUMBER private static final String ARG_PARAM1 = "param1"; private static final String ARG_PARAM2 = "param2"; @Bind(R.id.fbtn) Button fbtn; // TODO: Rename and change types of parameters private String mParam1; private String mParam2; private OnFragmentInteractionListener mListener; /** * Use this factory method to create a new instance of * this fragment using the provided parameters. * * @param param1 Parameter 1. * @param param2 Parameter 2. * @return A new instance of fragment TestFragment. */ // TODO: Rename and change types and number of parameters public static TestFragment newInstance(String param1, String param2) { TestFragment fragment = new TestFragment(); Bundle args = new Bundle(); args.putString(ARG_PARAM1, param1); args.putString(ARG_PARAM2, param2); fragment.setArguments(args); return fragment; }public TestFragment() { // Required empty public constructor }@Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); if (getArguments() != null) { mParam1 = getArguments().getString(ARG_PARAM1); mParam2 = getArguments().getString(ARG_PARAM2); } }@Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View view = inflater.inflate(R.layout.fragment_test, container, false); ButterKnife.bind(this, view); return view; }@Override public void onDestroyView() { super.onDestroyView(); ButterKnife.unbind(this); }@OnClick(R.id.fbtn) void fbtnClick() { Toast.makeText(getActivity(), "Fragment", Toast.LENGTH_SHORT).show(); fbtn.setText("呵呵哒"); getView().setBackgroundColor(Color.RED); }// TODO: Rename method, update argument and hook method into UI event public void onButtonPressed(Uri uri) { if (mListener != null) { mListener.onFragmentInteraction(uri); } }@Override public void onAttach(Activity activity) { super.onAttach(activity); try { mListener = (OnFragmentInteractionListener) activity; } catch (ClassCastException e) { throw new ClassCastException(activity.toString() + " must implement OnFragmentInteractionListener"); } }@Override public void onDetach() { super.onDetach(); mListener = null; }/** * This interface must be implemented by activities that contain this * fragment to allow an interaction in this fragment to be communicated * to the activity and potentially other fragments contained in that * activity. * < p/> * See the Android Training lesson < a href= https://www.songbingjia.com/android/*"http://developer.android.com/training/basics/fragments/communicating.html" * > Communicating with Other Fragments< /a> for more information. */ public interface OnFragmentInteractionListener { // TODO: Update argument type and name public void onFragmentInteraction(Uri uri); }}

主Activity的布局

< RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" android:paddingBottom="@dimen/activity_vertical_margin" tools:context=".MainActivity"> < TextView android:text="@string/hello_world" android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/textView" /> < Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="button1" android:id="@+id/button1" android:layout_below="@+id/textView" android:layout_alignParentLeft="true" android:layout_alignParentStart="true" /> < Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="button2" android:id="@+id/button2" android:layout_below="@+id/button1" android:layout_alignParentLeft="true" android:layout_alignParentStart="true" /> < Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="button3" android:id="@+id/button3" android:layout_below="@+id/button2" android:layout_alignParentLeft="true" android:layout_alignParentStart="true" /> < fragment android:layout_width="wrap_content" android:layout_height="wrap_content" android:name="test.butterknife.com.testdemo.TestFragment" android:id="@+id/fragment" android:layout_alignParentRight="true" android:layout_alignParentEnd="true" android:layout_below="@+id/button3" android:layout_alignParentLeft="true" android:layout_alignParentStart="true" android:layout_alignParentBottom="true" /> < /RelativeLayout>

大致就是如此，附上源代码地址：http://yunpan.cn/cdPg8bUwJa8sv訪问password 1845【安卓开发懒鬼最爱之ButterKnife，依赖注入第三方是库，进一步加速开发速度】有意參与一些开源项目。easy上手的Team能够找我聊聊。看看能够造福社会不。哈哈哈

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