写个简单的黄油刀

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@Retention(RetentionPolicy.RUNTIME)@Target(ElementType.METHOD)public @interface OnClick {    int value();}

@Retention(RetentionPolicy.RUNTIME)@Target(ElementType.METHOD)public @interface OnLongClick {    int value();}

@Target(ElementType.FIELD)@Retention(RetentionPolicy.RUNTIME)public @interface BindString {    int value();}

@Retention(RetentionPolicy.RUNTIME)@Target(ElementType.FIELD)public @interface BindView {    int value();}

@Retention(RetentionPolicy.RUNTIME)@Target(ElementType.METHOD)public @interface OnTouch {    int value();}

package com.example.administrator.mvplibao.utils.my_butter_knife;import android.app.Activity;import android.app.Fragment;import android.content.Context;import android.view.MotionEvent;import android.view.View;import com.example.administrator.mvplibao.utils.my_butter_knife.annotation.BindString;import com.example.administrator.mvplibao.utils.my_butter_knife.annotation.BindView;import com.example.administrator.mvplibao.utils.my_butter_knife.annotation.OnClick;import com.example.administrator.mvplibao.utils.my_butter_knife.annotation.OnLongClick;import com.example.administrator.mvplibao.utils.my_butter_knife.annotation.OnTouch;import java.lang.reflect.Field;import java.lang.reflect.InvocationTargetException;import java.lang.reflect.Method;/** * Created by Administrator on 2016/9/26. */public class MyButterKnife {    public static void bind(Activity activity) {        initFiled(activity, activity.getWindow().getDecorView());        initMethod(activity, activity.getWindow().getDecorView());    }    /**     * 绑定Fragment和其他对象     *     * @param object fragment对象     * @param view   要查找的控件树对象     */    public static void bind(Object object, View view) {        initFiled(object, view);        initMethod(object, view);    }    private static void initMethod(final Object object, View view) {        Class<?> aClass = object.getClass();//获取要反射的对象上的字节码对象        Method[] declaredMethods = aClass.getDeclaredMethods();        for (final Method method : declaredMethods) {//获取所有方法对象            method.setAccessible(true);            OnClick annotation = method.getAnnotation(OnClick.class);//获取方法对象上的注解            if (annotation != null) {                int id = annotation.value();                View temp = view.findViewById(id);//获取View并设置点击事件                temp.setOnClickListener(new View.OnClickListener() {                    @Override                    public void onClick(View v) {                        try {                            method.invoke(object);//反射调用对象上的方法                        } catch (IllegalAccessException e) {                            e.printStackTrace();                        } catch (InvocationTargetException e) {                            e.printStackTrace();                        }                    }                });                continue;            }            OnLongClick annotationL = method.getAnnotation(OnLongClick.class);            if (annotationL != null) {                int id = annotationL.value();                View temp = view.findViewById(id);                temp.setOnLongClickListener(new View.OnLongClickListener() {                    @Override                    public boolean onLongClick(View v) {                        try {                            method.invoke(object);                        } catch (IllegalAccessException e) {                            e.printStackTrace();                        } catch (InvocationTargetException e) {                            e.printStackTrace();                        }                        return true;                    }                });                continue;            }            OnTouch annotationT = method.getAnnotation(OnTouch.class);            if (annotationT != null) {                int id = annotationT.value();                View temp = view.findViewById(id);                temp.setOnTouchListener(new View.OnTouchListener() {                    @Override                    public boolean onTouch(View v, MotionEvent event) {                        try {                            method.invoke(object);                        } catch (IllegalAccessException e) {                            e.printStackTrace();                        } catch (InvocationTargetException e) {                            e.printStackTrace();                        }                        return true;                    }                });                continue;            }        }    }    private static void initFiled(Object object, View view) {        Class<?> aClass = object.getClass();        Field[] declaredFields = aClass.getDeclaredFields();        for (Field field : declaredFields) {            field.setAccessible(true);            //反射加载View            BindView annotation = field.getAnnotation(BindView.class);            if (annotation != null) {                int id = annotation.value();                View temp = view.findViewById(id);                try {                    field.set(object, temp);                } catch (IllegalAccessException e) {                    e.printStackTrace();                }                continue;            }            //反射加载String资源            BindString annotations = field.getAnnotation(BindString.class);            if (annotations != null) {                int id = annotations.value();                Context context = null;                if (object instanceof Context)                    context = (Context) object;                else if (object instanceof Fragment)                    context = ((android.support.v4.app.Fragment) object).getContext();                if (context == null)                    continue;                String str = context.getResources().getString(id);                try {                    field.set(object, str);                } catch (IllegalAccessException e) {                    e.printStackTrace();                }                continue;            }        }    }}

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