以注解的形式进行初始化

1.首先自定义一个注解

@Retention(RetentionPolicy.RUNTIME)//可以在虚拟中执行
@Target(ElementType.FIELD)//作用在属性变量上
public @interface InjectView {
    public int id();
}

2.向目标控件加上该注解

  @InjectView(id = R.id.main_button)
    private Button start;

3.定义一个注解工具类,这里自定一个 InitUtils

  public static void bind(Activity activity){//使用静态方法
        bindFeild(activity);
    }

    private static void bindFeild(Activity activity) {

        Class aClass = activity.getClass();//使用反射机制获取对象

        Field[] declaredFields = aClass.getDeclaredFields();

        for (Field declaredField : declaredFields) {

            InjectView injectView = declaredField.getAnnotation(InjectView.class);

            if(injectView!=null){
                int id = injectView.id();

                View viewById = activity.findViewById(id);

                declaredField.setAccessible(true);

                try {
                    declaredField.set(activity,viewById);
                } catch (IllegalAccessException e) {
                    e.printStackTrace();
                }
            }

        }
    }

4.最后调用该工具类

  InitUtils.bind(this);