前言
ButterKnife 簡介

ButterKnife是一個專注於Android系統的View注入框架,可以減少大量的findViewById以及setOnClickListener程式碼，視覺化一鍵生成。

專案github地址：

ButterKnife 優勢

1、強大的View繫結和Click事件處理功能，簡化程式碼，提升開發效率
2、方便的處理Adapter裡的ViewHolder繫結問題
3、執行時不會影響APP效率，使用配置方便
4、程式碼清晰，可讀性強

如何新增依賴

在module的build.gredle 檔案中的dependencies標籤中新增

compile 'com.jakewharton:butterknife:8.4.0'
 

如何使用
控制元件id 註解： @BindView（）

package com.zyj.wifi;

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 的修飾型別不能是：private 或者 static 。 否則會報錯：錯誤: @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);
        //繫結activity
 

        ButterKnife.bind( this ) ;

        button1.setText( "I am a button ");
    }
}

多個控制元件id 註解： @BindViews（）

package com.zyj.wifi;

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 ");
    }
}

fragment 使用

package com.zyj.wifi;

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);

        //繫結fragment
        ButterKnife.bind( this , view ) ;
        button1.setText( "I am a button ");
        return view ;
    }
}

@BindString() ：繫結string 字串

package com.zyj.wifi;

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 ) //繫結button 控制元件
    public Button button1 ;

    @BindString( R.string.app_name )  //繫結string 字串
    String meg;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_butterknife);

        //繫結activity
        ButterKnife.bind( this ) ;

        button1.setText( meg );
    }
}

@BindArray() : 繫結string裡面array陣列

<resources>
    <string name="app_name">WiFi管家</string>

    <string-array name="city">
        <item>廈門市</item>
        <item>福州市</item>
        <item>泉州市</item>
        <item>漳州市</item>
        <item>龍巖市</item>
    </string-array>

</resources>

package com.zyj.wifi;

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 ) //繫結button 控制元件
    public Button button1 ;

    @BindArray(R.array.city )  //繫結string裡面array陣列
    String [] citys ;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_butterknife);

        //繫結activity
        ButterKnife.bind( this ) ;

        button1.setText( citys[0] );
    }
}

@BindBitmap( ) : 繫結Bitmap 資源

package com.zyj.wifi;

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 ) //繫結ImageView 控制元件
    public ImageView imageView ;

    @BindBitmap( R.mipmap.wifi )  //繫結Bitmap 資源
    public Bitmap wifi_bitmap ;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_butterknife);

        //繫結activity
        ButterKnife.bind( this ) ;

        imageView.setImageBitmap( wifi_bitmap );
    }
}

@BindColor( ) : 繫結一個顏色值

package com.zyj.wifi;

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 )  //繫結一個控制元件
    public Button button1 ;

    @BindColor( R.color.colorAccent ) int black ;  //繫結一個顏色值

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_butterknife);

        //繫結activity
        ButterKnife.bind( this ) ;

        button1.setTextColor(  black );

    }
}

@OnClick( ) : 繫結控制元件點選事件
@OnLongClick( ) ： 繫結控制元件長按事件

package com.zyj.wifi;

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 )   //給 button1 設定一個點選事件
    public void showToast(){
        Toast.makeText(this, "is a click", Toast.LENGTH_SHORT).show();
    }

    @OnLongClick( R.id.button1 )    //給 button1 設定一個長按事件
    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);

        //繫結activity
        ButterKnife.bind( this ) ;

    }
}

zelezny : Butterknife外掛的使用
可以在Androidstudio中安裝zelezny外掛視覺化view注入。