Android注解利器：ButterKnife 的基本使用

   <h2>前言</h2>    <ul>     <li> <p>ButterKnife 简介</p> <p>ButterKnife是一个专注于Android系统的View注入框架,可以减少大量的findViewById以及setOnClickListener代码，可视化一键生成。</p> </li>    </ul>    <ul>     <li> <p>ButterKnife 优势</p> <p>1、强大的View绑定和Click事件处理功能，简化代码，提升开发效率</p> <p>2、方便的处理Adapter里的ViewHolder绑定问题</p> <p>3、运行时不会影响APP效率，使用配置方便</p> <p>4、代码清晰，可读性强</p> </li>    </ul>    <h2>如何添加依赖</h2>    <ul>     <li> <p>在项目的project 的build.gredle 文件中的dependencies标签下添加。</p> <p>classpath 'com.neenbedankt.gradle.plugins:android- apt:1.8 '</p> </li>    </ul>    <p>例如：</p>    <pre>  <code class="language-java">buildscript {      repositories {          jcenter()      }        dependencies {          classpath 'com.android.tools.build:gradle:2.2.2'          classpath 'com.neenbedankt.gradle.plugins:android-apt:1.8'      }  }    allprojects {      repositories {          jcenter()      }  }    task clean(type: Delete) {      delete rootProject.buildDir  }  </code></pre>    <ul>     <li> <p>在module的build.gredle 文件中添加</p> <p>apply plugin: 'android-apt'</p> </li>     <li> <p>在module的build.gredle 文件中的dependencies标签中添加</p> <p>compile 'com.jakewharton:butterknife:8.4.0'</p> <p>apt 'com.jakewharton:butterknife-compiler:8.4.0'</p> </li>    </ul>    <p>例如</p>    <pre>  <code class="language-java">apply plugin: 'com.android.application'  apply plugin: 'android-apt'    android {      compileSdkVersion 24      buildToolsVersion "24.0.3"        defaultConfig {          applicationId "com.zyj.wifi"          minSdkVersion 14          targetSdkVersion 24          versionCode 1          versionName "1.0"      }      buildTypes {          release {              minifyEnabled false              proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'          }      }  }    dependencies {      compile fileTree(dir: 'libs', include: ['*.jar'])            compile 'com.jakewharton:butterknife:8.4.0'      apt 'com.jakewharton:butterknife-compiler:8.4.0'  }  </code></pre>    <h2>如何使用</h2>    <ul>     <li>控件id 注解： @BindView（）</li>    </ul>    <pre>  <code class="language-java">package com.dl.ButterKnifeDemo;    import android.support.v7.app.AppCompatActivity;  import android.os.Bundle;  import android.widget.Button;    import butterknife.BindView;  import butterknife.ButterKnife;    public class ButterknifeActivity extends AppCompatActivity {        @BindView( R.id.button1 )      public Button button1 ;            // 注意：button 的修饰类型不能是：private 或者 static 。 否则会报错：错误: @BindView fields must not be private or static. (com.zyj.wifi.ButterknifeActivity.button1)        @Override      protected void onCreate(Bundle savedInstanceState) {          super.onCreate(savedInstanceState);          setContentView(R.layout.activity_butterknife);          //绑定activity          ButterKnife.bind( this ) ;            button1.setText( "I am a button ");      }  }  </code></pre>    <ul>     <li>多个控件id 注解： @BindViews（）</li>    </ul>    <pre>  <code class="language-java">package com.dl.ButterKnifeDemo;    import android.support.v7.app.AppCompatActivity;  import android.os.Bundle;  import android.widget.Button;  import java.util.List;  import butterknife.BindViews;  import butterknife.ButterKnife;    public class Main2Activity extends AppCompatActivity {        @BindViews({ R.id.button1  , R.id.button2 ,  R.id.button3 })      public List<Button> buttonList ;        @Override      protected void onCreate(Bundle savedInstanceState) {          super.onCreate(savedInstanceState);          setContentView(R.layout.activity_main2);            ButterKnife.bind(this);            buttonList.get( 0 ).setText( "hello 1 ");          buttonList.get( 1 ).setText( "hello 2 ");          buttonList.get( 2 ).setText( "hello 3 ");      }  }  </code></pre>    <ul>     <li>fragment 使用</li>    </ul>    <pre>  <code class="language-java">package com.dl.ButterKnifeDemo;    import android.os.Bundle;  import android.support.v4.app.Fragment;  import android.view.LayoutInflater;  import android.view.View;  import android.view.ViewGroup;  import android.widget.Button;    import butterknife.BindView;  import butterknife.ButterKnife;    public class ButterknifeFragment extends Fragment {        @BindView( R.id.button1 )      public Button button1 ;        @Override      public View onCreateView(LayoutInflater inflater, ViewGroup container,                               Bundle savedInstanceState) {          View view = inflater.inflate(R.layout.fragment_butterknife, container, false);            //绑定fragment          ButterKnife.bind( this , view ) ;          button1.setText( "I am a button ");          return view ;      }  }  </code></pre>    <ul>     <li>@BindString() ：绑定string 字符串</li>    </ul>    <pre>  <code class="language-java">package com.dl.ButterKnifeDemo;    import android.os.Bundle;  import android.support.v7.app.AppCompatActivity;  import android.widget.Button;    import butterknife.BindString;  import butterknife.BindView;  import butterknife.ButterKnife;    public class ButterknifeActivity extends AppCompatActivity {        @BindView( R.id.button1 ) //绑定button 控件      public Button button1 ;        @BindString( R.string.app_name )  //绑定string 字符串      String meg;        @Override      protected void onCreate(Bundle savedInstanceState) {          super.onCreate(savedInstanceState);          setContentView(R.layout.activity_butterknife);            //绑定activity          ButterKnife.bind( this ) ;            button1.setText( meg );      }  }  </code></pre>    <ul>     <li>@BindArray() : 绑定string里面array数组</li>    </ul>    <pre>  <code class="language-java"><resources>      <string name="app_name">WiFi管家</string>            <string-array name="city">          <item>厦门市</item>          <item>福州市</item>          <item>泉州市</item>          <item>漳州市</item>          <item>龙岩市</item>      </string-array>        </resources>        package com.dl.ButterKnifeDemo;    import android.os.Bundle;  import android.support.v7.app.AppCompatActivity;  import android.widget.Button;    import butterknife.BindArray;  import butterknife.BindView;  import butterknife.ButterKnife;    public class ButterknifeActivity extends AppCompatActivity {        @BindView( R.id.button1 ) //绑定button 控件      public Button button1 ;        @BindArray(R.array.city )  //绑定string里面array数组      String [] citys ;        @Override      protected void onCreate(Bundle savedInstanceState) {          super.onCreate(savedInstanceState);          setContentView(R.layout.activity_butterknife);            //绑定activity          ButterKnife.bind( this ) ;            button1.setText( citys[0] );      }  }  </code></pre>    <ul>     <li>@BindBitmap( ) : 绑定Bitmap 资源</li>    </ul>    <pre>  <code class="language-java">package com.dl.ButterKnifeDemo;    import android.graphics.Bitmap;  import android.os.Bundle;  import android.support.v7.app.AppCompatActivity;  import android.widget.ImageView;    import butterknife.BindBitmap;  import butterknife.BindView;  import butterknife.ButterKnife;    public class ButterknifeActivity extends AppCompatActivity {        @BindView( R.id.imageView ) //绑定ImageView 控件      public ImageView imageView ;        @BindBitmap( R.mipmap.wifi )  //绑定Bitmap 资源      public Bitmap wifi_bitmap ;        @Override      protected void onCreate(Bundle savedInstanceState) {          super.onCreate(savedInstanceState);          setContentView(R.layout.activity_butterknife);            //绑定activity          ButterKnife.bind( this ) ;            imageView.setImageBitmap( wifi_bitmap );      }  }  </code></pre>    <ul>     <li>@BindColor( ) : 绑定一个颜色值</li>    </ul>    <pre>  <code class="language-java">package com.dl.ButterKnifeDemo;    import android.os.Bundle;  import android.support.v7.app.AppCompatActivity;  import android.widget.Button;    import butterknife.BindColor;  import butterknife.BindView;  import butterknife.ButterKnife;    public class ButterknifeActivity extends AppCompatActivity {        @BindView( R.id.button1 )  //绑定一个控件      public Button button1 ;        @BindColor( R.color.colorAccent ) int black ;  //绑定一个颜色值        @Override      protected void onCreate(Bundle savedInstanceState) {          super.onCreate(savedInstanceState);          setContentView(R.layout.activity_butterknife);            //绑定activity          ButterKnife.bind( this ) ;            button1.setTextColor(  black );        }  }  </code></pre>    <ul>     <li>@OnClick( ) : 绑定控件点击事件</li>     <li>@OnLongClick( ) ： 绑定控件长按事件</li>    </ul>    <pre>  <code class="language-java">package com.dl.ButterKnifeDemo;    import android.os.Bundle;  import android.support.v7.app.AppCompatActivity;  import android.widget.Toast;    import butterknife.ButterKnife;  import butterknife.OnClick;  import butterknife.OnLongClick;    public class ButterknifeActivity extends AppCompatActivity {        @OnClick(R.id.button1 )   //给 button1 设置一个点击事件      public void showToast(){          Toast.makeText(this, "is a click", Toast.LENGTH_SHORT).show();      }        @OnLongClick( R.id.button1 )    //给 button1 设置一个长按事件      public boolean showToast2(){          Toast.makeText(this, "is a long click", Toast.LENGTH_SHORT).show();          return true  ;      }        @Override      protected void onCreate(Bundle savedInstanceState) {          super.onCreate(savedInstanceState);          setContentView(R.layout.activity_butterknife);            //绑定activity          ButterKnife.bind( this ) ;        }  }  </code></pre>    <ul>     <li> <p>zelezny : Butterknife插件的使用</p> <p>插件的安装</p> </li>    </ul>    <p style="text-align:center"><img src="https://simg.open-open.com/show/cdc6bd7fa7de7f6d3a761d41fccf1d70.png"></p>    <p style="text-align:center"><img src="https://simg.open-open.com/show/180d36b1714a0ace65e28d1fae6ce453.png"></p>    <p>插件的使用</p>    <p>安装完成插件后，会提示重启AS，重启完后，可以写一个布局并且新建一个代码类测试下。测试的过程中要注意的是，需要 将光标移到setContentView(R.layout.acty_login) ，将光标放到R.layout.acty_login，然后右键Generate就有了。要注意一定要将光标放在R.layout.acty_login上面。</p>    <p style="text-align:center"><img src="https://simg.open-open.com/show/84b66a1c0caee9c008da2a266095c9a7.gif"></p>    <p>这里需要注意的是在勾选控件的界面上，有一个CreateViewHolder , 很明显这个是专门为ListView或者RecyclerView的适配器专门提供的。</p>    <p> </p>    <p>来自：http://www.cnblogs.com/mysticCoder/p/6266544.html</p>    <p> </p>