Butterknife使用

1、简介

ButterKnife是注解中相对简单易懂的很不错的开源框架

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
2. 方便的处理Adapter里的ViewHolder绑定问题
3. 运行时不会影响APP效率，使用配置方便
4. 代码清晰，可读性强

2、下载地址

https://github.com/JakeWharton/butterknife

3、使用步骤

1. 在Setting->Plugins中输入butterknife添加插件>Android ButterKnife Aelezny ->点击安装
2. Module里的build.gradle里面添加> compile 'com.jakewharton:butterknife:7.0.1'

4、常用功能

1）省略findViewById()

（1）Activity中使用

以前

mTextView1 = (TextView) findViewById(R.id.butter_text_view_1);

现在

@InjectView(R.id.butter_text_view_2)
TextView mTextView2;

在设置好布局之后调用：ButterKnife.inject(this);:

注意 View变量声明的时候不能为private或者static.

（2）Fragment中使用

public class SimpleFragment extends Fragment {
 
    @InjectView(R.id.fragment_text_view)
    TextView mTextView;
 
    public SimpleFragment() {
    }
 
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_simple, container, false);
        ButterKnife.inject(this, view);
        mTextView.setText("TextView in Fragment are found!");
        return view;
    }
}

View view = inflater.inflate(R.layout.fragment_simple, container, false);
        ButterKnife.inject(this, view);

@InjectView(R.id.fragment_text_view)
    TextView mTextView;

mTextView.setText("TextView in Fragment are found!");

（3）Adapter ViewHolder中使用

@Override
    public View getView(int position, View convertView, ViewGroup parent) {
        ViewHolder holder;
        if (convertView == null) {
            convertView = mInflater.inflate(R.layout.person_item_layout, null);
            holder = new ViewHolder(convertView);
            convertView.setTag(holder);
        } else {
            holder = (ViewHolder) convertView.getTag();
        }
        Person person = getItem(position);
        if (null != person) {
            holder.name.setText(person.getName());
            holder.age.setText(String.valueOf(person.getAge()));
            holder.location.setText(person.getLocation());
            holder.work.setText(person.getWork());
        }
 
        return convertView;
    }
 
    static class ViewHolder {
        @InjectView(R.id.person_name)
        TextView name;
        @InjectView(R.id.person_age)
        TextView age;
        @InjectView(R.id.person_location)
        TextView location;
        @InjectView(R.id.person_work)
        TextView work;
 
        public ViewHolder(View view) {
            ButterKnife.inject(this, view);
        }
    }

2）省略setOnClickListener()

以前

finishButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            finish();
        }
    });

现在

@OnClick(R.id.basic_finish_a_button)
    void finishA(View view) {
        finish();
    }

ButterKnife.inject(this);

注意 注意这里方法仍然不能是private和static, 并且可以有一个参数View,也可不写.

3）ListView的点击@OnItemClick, CheckBox的@OnCheckedChanged也可以实现省略操作

4）可以一次指定多个id,为多个View绑定一个事件处理方法

@OnClick({R.id.button_enable, R.id.button_disable, R.id.button_alpha_0, R.id.button_alpha_1})
void editViewsClicked() {
    Toast.makeText(this, "You click the Button!", Toast.LENGTH_SHORT).show();
}