Butter Knife

参考：

Introduction：http://jakewharton.github.io/butterknife/
JakeWharton/butterknife：https://github.com/JakeWharton/butterknife
依赖注入框架AndroidAnnotations和ButterKnife真的方便了开发者？：https://www.zhihu.com/question/38742543?sort=created

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最近才接触到 ButterKnife，很好用，不过刚入门还是有一些困难，网上查找了不少资料，记录下 ButterKnife 最常用的方法，方便以后使用

下面代码的实现工程：ButterKnifeDemo

源代码编译工程：http://download.csdn.net/detail/u012005313/9824876

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主要内容

1. 基本原理
2. Android Studio 导入 ButterKnife
3. Activity 中使用
4. Fragment 和 Adapter 中使用
5. Android Studio 插件 android-butterknife-zelezny 使用

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基本原理

参考：【腾讯Bugly干货分享】深入理解 ButterKnife，让你的程序学会写代码

ButterKnife 是利用 Java 注解机制来实现辅助代码生成的框架，其在编译期生成代码，对运行时没有任何副作用（注：暂时不理解注解机制，没深入看过 ButterKnife 代码）

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Android Studio 导入 ButterKnife

当前最新版本：8.5.1

新建工程 ButterKnifeDemo：

打开 app->build.gradle，直接添加：

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

或者

打开 File->Project Structure，在 app->Dependencies 中打开 Library Dependency 窗口，输入 butterknife 进行查找

自此，导入完成

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Activity 中使用

ButterKnife 的使用方式非常简单

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.

接下来用具体的实例验证

在 Activity 中使用

在 MainActivity 中实现

• 文本视图（TextView）
• 进度条（ProgressBar）
• 按钮（Button）
• 多选框（CheckBox）
• 单选框（RadioButton）
• 下拉框（Spinner）
• 图像按钮（ImageButton）

利用 ButterKnife 进行组件绑定，同时进行值设置，属性设置，以及接口调用

strings.xml：

<resources>    <string name="app_name">ButterKnifeDemo</string>    <string-array name="array">        <item>卡西</item>        <item>阿道夫</item>        <item>供电所</item>    </string-array>    <string-array name="array2">        <item>啊等发达</item>        <item>噶地方</item>        <item>擦地方</item>    </string-array>    <string-array name="array3">        <item>fadf</item>        <item>cadrfe</item>        <item>gadfa</item>        <item>cafd</item>    </string-array></resources>

activity_main.xml：

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:app="http://schemas.android.com/apk/res-auto"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical"    tools:context="com.uniview.butterknifedemo.MainActivity">    <TextView        android:id="@+id/am_tv"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="TextView" />    <ProgressBar        android:id="@+id/progressBar"        style="?android:attr/progressBarStyle"        android:layout_width="match_parent"        android:layout_height="wrap_content" />    <LinearLayout        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:orientation="horizontal">        <TextView            android:id="@+id/ll_tv1"            android:layout_width="match_parent"            android:layout_height="wrap_content"            android:layout_weight="1"            android:text="TextView" />        <TextView            android:id="@+id/ll_tv2"            android:layout_width="match_parent"            android:layout_height="wrap_content"            android:layout_weight="1"            android:text="TextView" />        <TextView            android:id="@+id/ll_tv3"            android:layout_width="match_parent"            android:layout_height="wrap_content"            android:layout_weight="1"            android:text="TextView" />    </LinearLayout>    <Button        android:id="@+id/button"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="Button" />    <LinearLayout        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:orientation="horizontal">        <CheckBox            android:id="@+id/checkBox3"            android:layout_width="match_parent"            android:layout_height="wrap_content"            android:layout_weight="1"            android:text="CheckBox" />        <CheckBox            android:id="@+id/checkBox2"            android:layout_width="match_parent"            android:layout_height="wrap_content"            android:layout_weight="1"            android:text="CheckBox" />        <CheckBox            android:id="@+id/checkBox"            android:layout_width="match_parent"            android:layout_height="wrap_content"            android:layout_weight="1"            android:text="CheckBox" />    </LinearLayout>    <RadioGroup        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:orientation="vertical"        >        <RadioButton            android:id="@+id/radioButton"            android:layout_width="match_parent"            android:layout_height="wrap_content"            android:layout_weight="1"            android:text="RadioButton" />        <RadioButton            android:id="@+id/radioButton4"            android:layout_width="match_parent"            android:layout_height="wrap_content"            android:layout_weight="1"            android:text="RadioButton" />        <RadioButton            android:id="@+id/radioButton3"            android:layout_width="match_parent"            android:layout_height="wrap_content"            android:layout_weight="1"            android:text="RadioButton" />        <RadioButton            android:id="@+id/radioButton2"            android:layout_width="match_parent"            android:layout_height="wrap_content"            android:layout_weight="1"            android:text="RadioButton" />    </RadioGroup>    <LinearLayout        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:orientation="horizontal">        <Spinner            android:id="@+id/spinner"            android:layout_width="match_parent"            android:layout_height="wrap_content"            android:layout_weight="1" />        <ImageButton            android:id="@+id/imageButton"            android:layout_width="match_parent"            android:layout_height="wrap_content"            android:layout_weight="1"            android:src="@android:drawable/arrow_down_float"            app:srcCompat="@color/colorPrimaryDark" />    </LinearLayout></LinearLayout>

MainActivity.java：

package com.uniview.butterknifedemo;import android.content.Intent;import android.os.Bundle;import android.support.annotation.NonNull;import android.support.v7.app.AppCompatActivity;import android.util.Log;import android.view.View;import android.widget.AdapterView;import android.widget.ArrayAdapter;import android.widget.Button;import android.widget.CheckBox;import android.widget.ImageButton;import android.widget.ProgressBar;import android.widget.RadioButton;import android.widget.Spinner;import android.widget.TextView;import android.widget.Toast;import java.util.List;import butterknife.BindArray;import butterknife.BindString;import butterknife.BindView;import butterknife.BindViews;import butterknife.ButterKnife;import butterknife.OnClick;import butterknife.OnItemSelected;public class MainActivity extends AppCompatActivity {    private static final String TAG = MainActivity.class.getSimpleName();    @BindView(R.id.am_tv)    TextView textView;    @BindView(R.id.progressBar)    ProgressBar progressBar;    @BindViews({R.id.ll_tv1, R.id.ll_tv2, R.id.ll_tv3})    List<TextView> textViewList;    @BindView(R.id.button)    Button button;    @BindViews({R.id.checkBox, R.id.checkBox2, R.id.checkBox3})    List<CheckBox> checkBoxList;    @BindViews({R.id.radioButton, R.id.radioButton2, R.id.radioButton3, R.id.radioButton4})    List<RadioButton> radioButtonList;    @BindView(R.id.spinner)    Spinner spinner;    @BindView(R.id.imageButton)    ImageButton imageButton;    @BindString(R.string.app_name)    String appName;    @BindArray(R.array.array)    String[] arrays;    @BindArray(R.array.array2)    String[] arrays2;    @BindArray(R.array.array3)    String[] arrays3;    static final ButterKnife.Setter<TextView, String[]> initialText = new ButterKnife.Setter<TextView, String[]>() {        @Override        public void set(@NonNull TextView view, String[] value, int index) {            view.setText(value[index]);        }    };    static final ButterKnife.Setter<TextView, String[]> initialRadio = new ButterKnife.Setter<TextView, String[]>() {        @Override        public void set(@NonNull TextView view, String[] value, int index) {            view.setText(value[index]);        }    };    static final ButterKnife.Action<TextView> visible = new ButterKnife.Action<TextView>() {        @Override        public void apply(@NonNull TextView view, int index) {            view.setVisibility(View.VISIBLE);        }    };    static final ButterKnife.Action<TextView> invisible = new ButterKnife.Action<TextView>() {        @Override        public void apply(@NonNull TextView view, int index) {            view.setVisibility(View.INVISIBLE);        }    };    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        ButterKnife.bind(this);        initView();    }    private void initView() {        textView.setText(appName);//        for (int i = 0; i < 3; i++) {//            textViewList.get(i).setText(arrays[i]);//        }        ButterKnife.apply(textViewList, initialText, arrays);//        ButterKnife.apply(textViewList, actionText);        ButterKnife.apply(checkBoxList, initialText, arrays2);        ButterKnife.apply(radioButtonList, initialRadio, arrays3);        ButterKnife.apply(textViewList, invisible);        ArrayAdapter<CharSequence> spinnerAdapter = ArrayAdapter.createFromResource(this,             android.R.array.organizationTypes, android.R.layout.simple_spinner_item);        spinnerAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);        spinner.setAdapter(spinnerAdapter);    }    @OnClick(R.id.am_tv)    void textViewClick() {        String text = textView.getText().toString();        if (text.equals("Hello World")) {            textView.setText("Hello zj");        } else {            textView.setText("Hello World");        }    }    @OnClick({R.id.ll_tv1, R.id.ll_tv2, R.id.ll_tv3})    void textMultipleClick() {//        for (int i = 0; i < 3; i++) {//            textViewList.get(i).setText(arrays2[i]);//        }        ButterKnife.apply(textViewList, initialText, arrays2);    }    @OnClick(R.id.button)    void btnClick(View view) {        int flag = progressBar.getVisibility();        Log.e(TAG, "btnClick: flag = " + flag);        if (flag == progressBar.VISIBLE) {            progressBar.setVisibility(progressBar.INVISIBLE);            ButterKnife.apply(textViewList, visible);        } else {            progressBar.setVisibility(progressBar.VISIBLE);            ButterKnife.apply(textViewList, invisible);        }    }    @OnClick({R.id.checkBox, R.id.checkBox2, R.id.checkBox3})    void onCheckboxClicked(View view) {        switch (view.getId()) {            case R.id.checkBox:                Toast.makeText(this, "you click checkbox + " + ((CheckBox) view).getText(), Toast.LENGTH_SHORT).show();                break;            case R.id.checkBox2:                Toast.makeText(this, "you click checkbox2 + " + ((CheckBox) view).getText(), Toast.LENGTH_SHORT).show();                break;            case R.id.checkBox3:                Toast.makeText(this, "you click checkbox3 + " + ((CheckBox) view).getText(), Toast.LENGTH_SHORT).show();                break;        }    }    @OnClick({R.id.radioButton, R.id.radioButton2, R.id.radioButton3, R.id.radioButton4})    void onRadioClicked(View view) {        switch (view.getId()) {            case R.id.radioButton:                Toast.makeText(this, "you click radiobutton + " + ((RadioButton) view).getText(), Toast.LENGTH_SHORT).show();                break;            case R.id.radioButton2:                Toast.makeText(this, "you click radiobutton2 + " + ((RadioButton) view).getText(), Toast.LENGTH_SHORT).show();                break;            case R.id.radioButton3:                Toast.makeText(this, "you click radiobutton3 + " + ((RadioButton) view).getText(), Toast.LENGTH_SHORT).show();                break;            case R.id.radioButton4:                Toast.makeText(this, "you click radiobutton4 + " + ((RadioButton) view).getText(), Toast.LENGTH_SHORT).show();                break;        }    }    @OnItemSelected(value = R.id.spinner, callback = OnItemSelected.Callback.ITEM_SELECTED)    void onItemSel(AdapterView<?> parent, View view, int position, long id) {        Toast.makeText(this, "position: " + position + " id: " + id, Toast.LENGTH_SHORT).show();    }    @OnClick(R.id.imageButton)    void onImageBtnClicked() {        Intent intent = new Intent(this, Main2Activity.class);        intent.putExtra("image", "image");        startActivity(intent);    }}

首先需要在 onCreate() 中调用 ButterKnife

注意：需要在 ‘setContentView’ 之后

@Overrideprotected void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.activity_main);    ButterKnife.bind(this);    // TODO Use fields...}

对于视图，可以单个绑定，也可以将多个视图同时进行绑定，生成 List 或者 Array 形式：

@BindView(R.id.am_tv)TextView textView;@BindView(R.id.progressBar)ProgressBar progressBar;@BindViews({R.id.ll_tv1, R.id.ll_tv2, R.id.ll_tv3})List<TextView> textViewList;@BindView(R.id.button)Button button;@BindViews({R.id.checkBox, R.id.checkBox2, R.id.checkBox3})List<CheckBox> checkBoxList;@BindViews({R.id.radioButton, R.id.radioButton2, R.id.radioButton3, R.id.radioButton4})List<RadioButton> radioButtonList;@BindView(R.id.spinner)Spinner spinner;@BindView(R.id.imageButton)ImageButton imageButton;

Note：这样操作之后，就不需要再使用 findViewById 了

使用 ButterKnife 同时可以对资源进行绑定：

@BindString(R.string.app_name)String appName;@BindArray(R.array.array)String[] arrays;@BindArray(R.array.array2)String[] arrays2;@BindArray(R.array.array3)String[] arrays3;

不仅可以进行字符串，字符串数组绑定，还可以进行颜色，图像等其他资源绑定

当多个视图同时绑定，生成 List 或者 Array 形式后，ButterKnife 还提供了同时赋值和属性设置的功能

参考：ButterKnife使用详解

赋值函数：

  /** A setter that can apply a value to a list of views. */  public interface Setter<T extends View, V> {    /** Set the {@code value} on the {@code view} which is at {@code index} in the list. */    @UiThread    void set(@NonNull T view, V value, int index);  }

属性设置函数：

   /** An action that can be applied to a list of views. */  public interface Action<T extends View> {    /** Apply the action on the {@code view} which is at {@code index} in the list. */    @UiThread    void apply(@NonNull T view, int index);  }

应用函数：

There are three convenience methods for working with view collections:apply(List, Action) – Applies an action to each view.apply(List, Setter, Object) – Applies a setter value to each view.apply(List, Property, Object) – Applies a property value to each view.

对于视图而言，还可以对接口事件进行绑定

比如对于 TextView 来说，可以进行点击事件的绑定：

@OnClick(R.id.am_tv)void textViewClick() {    ...}

函数名自定义，可以根据需求添加原本接口函数的参数：

@OnClick(R.id.button)void btnClick(View view) {    ...}

如果接口事件中有多个函数，需要进行指定：

@OnItemSelected(value = R.id.spinner, callback = OnItemSelected.Callback.ITEM_SELECTED)    ...}

如果多个视图都要进行同一事件的操作，可以同时绑定：

@OnClick({R.id.radioButton, R.id.radioButton2, R.id.radioButton3, R.id.radioButton4})void onRadioClicked(View view) {    switch (view.getId()) {        case R.id.radioButton:            Toast.makeText(this, "you click radiobutton + " + ((RadioButton) view).getText(), Toast.LENGTH_SHORT).show();            break;        case R.id.radioButton2:            Toast.makeText(this, "you click radiobutton2 + " + ((RadioButton) view).getText(), Toast.LENGTH_SHORT).show();            break;        case R.id.radioButton3:            Toast.makeText(this, "you click radiobutton3 + " + ((RadioButton) view).getText(), Toast.LENGTH_SHORT).show();            break;        case R.id.radioButton4:            Toast.makeText(this, "you click radiobutton4 + " + ((RadioButton) view).getText(), Toast.LENGTH_SHORT).show();            break;    }}

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Fragment 和 Adapter 中使用

ButterKnife 不仅可以用在 Activity 中，还可以使用在 Fragment 和 Adapter 中，接下来实现一个 ViewPager + TabLayout + Fragment + RecyclerView 的组合

Main3Activity.java:

package com.uniview.butterknifedemo;import android.support.design.widget.TabLayout;import android.support.v4.view.ViewPager;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import butterknife.BindView;import butterknife.ButterKnife;public class Main3Activity extends AppCompatActivity {    @BindView(R.id.tab_layout)    TabLayout tabLayout;    @BindView(R.id.view_pager)    ViewPager viewPager;    private MyAdapter myAdapter;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main3);        ButterKnife.bind(this);        initView();    }    private void initView() {        myAdapter = new MyAdapter(this, getSupportFragmentManager());        viewPager.setAdapter(myAdapter);        tabLayout.setTabMode(TabLayout.MODE_FIXED);        tabLayout.setupWithViewPager(viewPager);    }}

activity_main3.xml：

<?xml version="1.0" encoding="utf-8"?><LinearLayout 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:orientation="vertical"    tools:context="com.uniview.butterknifedemo.Main3Activity">    <android.support.design.widget.TabLayout        android:id="@+id/tab_layout"        android:layout_width="match_parent"        android:layout_height="wrap_content" />    <android.support.v4.view.ViewPager        android:id="@+id/view_pager"        android:layout_width="match_parent"        android:layout_height="match_parent" /></LinearLayout>

MyAdapter.java：

package com.uniview.butterknifedemo;import android.content.Context;import android.support.design.widget.TabLayout;import android.support.v4.app.Fragment;import android.support.v4.app.FragmentManager;import android.support.v4.app.FragmentPagerAdapter;/** * Created by Lenovo on 2017/4/23. */public class MyAdapter extends FragmentPagerAdapter {    private final String Tabs[] = {"left", "middle", "right"};    private Context context;    public MyAdapter(Context context, FragmentManager fm) {        super(fm);        this.context = context;    }    @Override    public Fragment getItem(int position) {        return ViewPagerFragment.newInstance(position);    }    @Override    public int getCount() {        return Tabs.length;    }    @Override    public CharSequence getPageTitle(int position) {//        return super.getPageTitle(position);        return Tabs[position];    }}

ViewPagerFragment.java：

package com.uniview.butterknifedemo;import android.os.Bundle;import android.support.annotation.Nullable;import android.support.v4.app.Fragment;import android.support.v7.widget.DividerItemDecoration;import android.support.v7.widget.LinearLayoutManager;import android.support.v7.widget.RecyclerView;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.TextView;import java.util.ArrayList;import java.util.Collections;import java.util.List;import butterknife.BindArray;import butterknife.BindView;import butterknife.ButterKnife;import butterknife.Unbinder;/** * Created by Lenovo on 2017/4/22. */public class ViewPagerFragment extends Fragment {    private int status;    @BindView(R.id.text)    TextView textView;    @BindView(R.id.recycler_view)    RecyclerView recyclerView;    @BindArray(R.array.array)    String[] arrays;    @BindArray(R.array.array2)    String[] arrays2;    private Unbinder unbinder;    private DisplayAdapter displayAdapter;    private LinearLayoutManager linearLayoutManager;    public static ViewPagerFragment newInstance(int status) {        ViewPagerFragment viewPagerFragment = new ViewPagerFragment();        Bundle args = new Bundle();        args.putInt("status", status);        viewPagerFragment.setArguments(args);        return viewPagerFragment;    }    @Override    public void onCreate(@Nullable Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        status = getArguments() != null ? getArguments().getInt("status") : 1;    }    @Nullable    @Override    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {//        return super.onCreateView(inflater, container, savedInstanceState);        View v = inflater.inflate(R.layout.fragment_view, container, false);        unbinder = ButterKnife.bind(this, v);        textView.setText("statu: " + status);        linearLayoutManager = new LinearLayoutManager(getContext());        recyclerView.setLayoutManager(linearLayoutManager);        if (status == 0 || status == 2) {            displayAdapter = new DisplayAdapter(getActivity(), java.util.Arrays.asList(arrays));        } else {            displayAdapter = new DisplayAdapter(getActivity(), java.util.Arrays.asList(arrays2));        }        recyclerView.setAdapter(displayAdapter);        return v;    }    @Override    public void onDestroyView() {        super.onDestroyView();        unbinder.unbind();    }}

fragment_view.xml：

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical">    <TextView        android:id="@+id/text"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:gravity="center"        android:text="@string/app_name"        android:textSize="24sp" />    <android.support.v7.widget.RecyclerView        android:id="@+id/recycler_view"        android:layout_width="match_parent"        android:layout_height="match_parent"        android:layout_weight="1" /></LinearLayout>

DisplayAdapter.java：

package com.uniview.butterknifedemo;import android.content.Context;import android.support.v7.widget.RecyclerView;import android.util.Log;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.TextView;import java.util.ArrayList;import java.util.List;import butterknife.BindView;import butterknife.ButterKnife;/** * Created by Lenovo on 2017/4/24. */public class DisplayAdapter extends RecyclerView.Adapter<DisplayAdapter.MyViewHolder> {    private static final String TAG = DisplayAdapter.class.getSimpleName();    private Context context;    private List<String> arrays = new ArrayList<>();    public DisplayAdapter(Context context, List<String> arrs) {        this.context = context;        arrays.addAll(arrs);    }    @Override    public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {//        return null;        View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.layout_recycler_view, parent, false);        MyViewHolder vh = new MyViewHolder(v);        return vh;    }    @Override    public void onBindViewHolder(MyViewHolder holder, int position) {        holder.textView.setText(arrays.get(position));    }    @Override    public int getItemCount() {        return arrays.size();    }    static class MyViewHolder extends RecyclerView.ViewHolder {        @BindView(R.id.text)        TextView textView;        public MyViewHolder(View itemView) {            super(itemView);            ButterKnife.bind(this, itemView);        }    }}

layout_recycler_view.xml：

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="wrap_content"    android:orientation="vertical">    <TextView        android:id="@+id/text"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:gravity="center"        android:minHeight="?android:attr/listPreferredItemHeightSmall"        android:paddingEnd="?android:attr/listPreferredItemPaddingEnd"        android:paddingStart="?android:attr/listPreferredItemPaddingStart"        android:text="@string/app_name"        android:textAppearance="?android:attr/textAppearanceListItemSmall" />    <View        android:layout_width="match_parent"        android:layout_height="1px"        android:background="#000000" /></LinearLayout>

绑定 fragment 格式如下：

  @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;  }

在绑定自身的同时还需要指明父视图。同时，由于 fragment 有一个不同的生命周期，需要在 onDestroyView 方法中解绑 ButterKnife，具体用法如下：

  @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();  }

当前代码操作如下：

@Nullable@Overridepublic View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {//        return super.onCreateView(inflater, container, savedInstanceState);    View v = inflater.inflate(R.layout.fragment_view, container, false);    unbinder = ButterKnife.bind(this, v);    textView.setText("statu: " + status);    linearLayoutManager = new LinearLayoutManager(getContext());    recyclerView.setLayoutManager(linearLayoutManager);    if (status == 0 || status == 2) {        displayAdapter = new DisplayAdapter(getActivity(), java.util.Arrays.asList(arrays));    } else {        displayAdapter = new DisplayAdapter(getActivity(), java.util.Arrays.asList(arrays2));    }    recyclerView.setAdapter(displayAdapter);    return v;}@Overridepublic void onDestroyView() {    super.onDestroyView();    unbinder.unbind();}

使用 RecyclerView 或者 ListView 时，经常会使用 ViewHolder 模型来优化，ButterKnife 也提供了在 ViewHolder 中进行视图绑定的方法：

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 {    @BindView(R.id.title) TextView name;    @BindView(R.id.job_title) TextView jobTitle;    public ViewHolder(View view) {      ButterKnife.bind(this, view);    }  }}

当前代码中 ViewHolder 操作如下：

static class MyViewHolder extends RecyclerView.ViewHolder {    @BindView(R.id.text)    TextView textView;    public MyViewHolder(View itemView) {        super(itemView);        ButterKnife.bind(this, itemView);    }}

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Android Studio 插件 android-butterknife-zelezny 使用

参考：

avast/android-butterknife-zelezny

AS ButterKnife 插件的引入，爬坑。

Android Studio 上有关于 ButterKnife 的插件，推荐 android-butterknife-zelezny，非常有用

安装方法不再介绍，下面提醒一下使用时需要注意的事情：

安装完成后，需要点击在 xml 文件上，鼠标右键点击 Generate...，才会出现 ButterKnife 的选项