3.ButterKnife

compile 'com.jakewharton:butterknife:8.5.1'
annotationProcessor 'com.jakewharton:butterknife-compiler:8.5.1'

初始化要放在setView()之后
setContentView(R.layout.activity_butter_knife_test);
ButterKnife.bind(this);

查找TextView与Button
@BindView(R.id.tv_test1)
TextView tvTest;
@BindView(R.id.btn_test1)
Button btnTest;

给按钮设置点击监听事件
@OnClick(R.id.btn_test1)
public void onclick(View view){
btnTest.setText("我被点击了");
tvTest.setText("天若有情天亦老");
}

下载注解插件进行一键初始化
打开android的plugins中心，搜索butterknife ,下载前两个插件都可以。 下载完成后，回到activity代码的setContentview处，右键布局文件名，注意一定要把光标停在布局文件名上 ,选择Generate，这时可以看到生成butterknife注解的选项，点击生成butterknife注解

其它用途绑定

绑定res里资源对象

class ExampleActivity extends Activity {
//绑定字符串
@BindString(R.string.title) String title;
//绑定图形
@BindDrawable(R.drawable.graphic) Drawable graphic;
//绑定颜色
@BindColor(R.color.red) int red; // int or ColorStateList field
//绑定长度
@BindDimen(R.dimen.spacer) Float spacer; // int (for pixel size) or float (for exact value) field
// ...
}

绑定Fragment
public class MyFragment extends Fragment {
@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;
}
}

绑定adapter
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);
//利用构造器将item的view传入viewHolder中
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) {
//在构造器中绑定view
  ButterKnife.bind(this, view);
}

}
}

绑定控件ID直接将控件添加至集合或数组中
@BindViews({ R.id.first_name, R.id.middle_name, R.id.last_name })
//nameViews的集中中添加了三个edittext对象
List<EditText> nameViews;

一次性改变集合中所有对象的值-apply
//DISABLE是一个接口的实现类
ButterKnife.apply(nameViews, DISABLE);
ButterKnife.apply(nameViews, ENABLED, false);
Action and Setter interfaces allow specifying simple behavior.

//初始化DISABLE
static final ButterKnife.Action<View> DISABLE = new ButterKnife.Action<View>() {
@Override public void apply(View view, int index) {
//将view设为不可输入
view.setEnabled(false);
}
};
//以下是传入布尔值
static final ButterKnife.Setter<View, Boolean> ENABLED = new ButterKnife.Setter<View, Boolean>() {
@Override public void set(View view, Boolean value, int index) {
view.setEnabled(value);
}
};

//如果是view的自带属性，可以不用实现接口，直接使用

ButterKnife.apply(nameViews, View.ALPHA, 0.0f);

绑定listview的item点击事件
@OnItemSelected(R.id.list_view)
void onItemSelected(int position) {
// TODO ...
}

findviewById的简化
适用于从dialog中找到控件
View view = LayoutInflater.from(context).inflate(R.layout.thing, null);
TextView firstName = ButterKnife.findById(view, R.id.first_name);
TextView lastName = ButterKnife.findById(view, R.id.last_name);
ImageView photo = ButterKnife.findById(view, R.id.photo);