動態代理—IOC框架

第一個部分- XUtils框架2.0實現：事件注入、資源注入、儲存資料注入 1、注入事件 XUtils2.0框架實現

import android.app.Activity;
import android.preference.Preference;
import android.preference.PreferenceActivity;
import android.preference.PreferenceGroup;
import android.view.View;
import com.lidroid.xutils.util.LogUtils;
import com.lidroid.xutils.view.EventListenerManager;
import com.lidroid.xutils.view.ResLoader;
import com.lidroid.xutils.view.ViewFinder;
import com.lidroid.xutils.view.ViewInjectInfo;
import com.lidroid.xutils.view.annotation.ContentView;
import com.lidroid.xutils.view.annotation.PreferenceInject;
import com.lidroid.xutils.view.annotation.ResInject;
import com.lidroid.xutils.view.annotation.ViewInject;
import com.lidroid.xutils.view.annotation.event.EventBase;

import java.lang.annotation.Annotation;
import java.lang.reflect.Array;
import java.lang.reflect.Field;
import java.lang.reflect.Method;

public class ViewUtils {

    private ViewUtils() {
    }

    public static void inject(View view) {
        injectObject(view, new ViewFinder(view));
    }

    public static void inject(Activity activity) {
        injectObject(activity, new ViewFinder(activity));
    }

    public static void inject(PreferenceActivity preferenceActivity) {
        injectObject(preferenceActivity, new ViewFinder(preferenceActivity));
    }

    public static void inject(Object handler, View view) {
        injectObject(handler, new ViewFinder(view));
    }

    public static void inject(Object handler, Activity activity) {
        injectObject(handler, new ViewFinder(activity));
    }

    public static void inject(Object handler, PreferenceGroup preferenceGroup) {
        injectObject(handler, new ViewFinder(preferenceGroup));
    }

    public static void inject(Object handler, PreferenceActivity preferenceActivity) {
        injectObject(handler, new ViewFinder(preferenceActivity));
    }

    @SuppressWarnings("ConstantConditions")
    private static void injectObject(Object handler, ViewFinder finder) {

        Class<?> handlerType = handler.getClass();

        // inject ContentView
        ContentView contentView = handlerType.getAnnotation(ContentView.class);
        if (contentView != null) {
            try {
                Method setContentViewMethod = handlerType.getMethod("setContentView", int.class);
                setContentViewMethod.invoke(handler, contentView.value());
            } catch (Throwable e) {
                LogUtils.e(e.getMessage(), e);
            }
        }

        // inject view
        Field[] fields = handlerType.getDeclaredFields();
        if (fields != null && fields.length > 0) {
            for (Field field : fields) {
                ViewInject viewInject = field.getAnnotation(ViewInject.class);
                if (viewInject != null) {
                    try {
                        View view = finder.findViewById(viewInject.value(), viewInject.parentId());
                        if (view != null) {
                            field.setAccessible(true);
                            field.set(handler, view);
                        }
                    } catch (Throwable e) {
                        LogUtils.e(e.getMessage(), e);
                    }
                } else {
                    ResInject resInject = field.getAnnotation(ResInject.class);
                    if (resInject != null) {
                        try {
                            Object res = ResLoader.loadRes(
                                    resInject.type(), finder.getContext(), resInject.id());
                            if (res != null) {
                                field.setAccessible(true);
                                field.set(handler, res);
                            }
                        } catch (Throwable e) {
                            LogUtils.e(e.getMessage(), e);
                        }
                    } else {
                        PreferenceInject preferenceInject = field.getAnnotation(PreferenceInject.class);
                        if (preferenceInject != null) {
                            try {
                                Preference preference = finder.findPreference(preferenceInject.value());
                                if (preference != null) {
                                    field.setAccessible(true);
                                    field.set(handler, preference);
                                }
                            } catch (Throwable e) {
                                LogUtils.e(e.getMessage(), e);
                            }
                        }
                    }
                }
            }
        }

        // inject event
        Method[] methods = handlerType.getDeclaredMethods();
        if (methods != null && methods.length > 0) {
            for (Method method : methods) {
                Annotation[] annotations = method.getDeclaredAnnotations();
                //便利註解目的：為了獲取我們想要的註解物件
                if (annotations != null && annotations.length > 0) {
                    for (Annotation annotation : annotations) {
                        //獲取註解型別
                        Class<?> annType = annotation.annotationType();
                        if (annType.getAnnotation(EventBase.class) != null) {
                            method.setAccessible(true);
                            try {
                                // ProGuard：-keep class * extends java.lang.annotation.Annotation { *; }
                                Method valueMethod = annType.getDeclaredMethod("value");
                                Method parentIdMethod = null;
                                try {
                                    parentIdMethod = annType.getDeclaredMethod("parentId");
                                } catch (Throwable e) {
                                }
                                //獲取OnClick、OnLongClick......註解身上的value方法
                                //values說白了就是控制元件的id陣列
                                Object values = valueMethod.invoke(annotation);
                                Object parentIds = parentIdMethod == null ? null : parentIdMethod.invoke(annotation);
                                int parentIdsLen = parentIds == null ? 0 : Array.getLength(parentIds);
                                //獲取陣列長度
                                int len = Array.getLength(values);
                                //遍歷id陣列
                                for (int i = 0; i < len; i++) {
                                    ViewInjectInfo info = new ViewInjectInfo();
                                    //獲取陣列中試圖的id(一個的id)
                                    info.value = Array.get(values, i);
                                    info.parentId = parentIdsLen > i ? (Integer) Array.get(parentIds, i) : 0;
                                    EventListenerManager.addEventMethod(finder, info, annotation, handler, method);
                                }
                            } catch (Throwable e) {
                                LogUtils.e(e.getMessage(), e);
                            }
                        }
                    }
                }
            }
        }
    }

}
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繫結事件（通過動態代理實現） EventListenerManager.Java

import android.view.View;
import com.lidroid.xutils.util.LogUtils;
import com.lidroid.xutils.util.DoubleKeyValueMap;
import com.lidroid.xutils.view.annotation.event.EventBase;

import java.lang.annotation.Annotation;
import java.lang.ref.WeakReference;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
import java.util.HashMap;

public class EventListenerManager {

    private EventListenerManager() {
    }

    /**
     * k1: viewInjectInfo
     * k2: interface Type
     * value: listener
     */
    private final static DoubleKeyValueMap<ViewInjectInfo, Class<?>, Object> listenerCache =
            new DoubleKeyValueMap<ViewInjectInfo, Class<?>, Object>();

    public static void addEventMethod(
            ViewFinder finder,
            ViewInjectInfo info,
            Annotation eventAnnotation,
            Object handler,
            Method method) {
        try {
            View view = finder.findViewByInfo(info);
            if (view != null) {
                EventBase eventBase = eventAnnotation.annotationType().getAnnotation(EventBase.class);
                //監聽型別：OnClickListener、OnTouchListener、OnLongClickListener......
               Class<?> listenerType = eventBase.listenerType();
               //事件源（你要給那個View繫結監聽，而且該監聽對應的方法）
               //View.setOnClickListener() View.setOnTouchListener view.setOnLongClickListener
                String listenerSetter = eventBase.listenerSetter();
               //監聽方法：onClick方法、onTouch方法、onLongClick方法
                String methodName = eventBase.methodName();
                
               //addNewMethod該屬性作用：控制是否需要建立代理物件，如果快取存在，我們不需要建立，不存在則建立
               //false：代表建立 true：代表不建立
                boolean addNewMethod = false;
                //從快取中獲取提高了效能、節約了效能
             
                Object listener = listenerCache.get(info, listenerType);
                DynamicHandler dynamicHandler = null;
                if (listener != null) {
                    dynamicHandler = (DynamicHandler) Proxy.getInvocationHandler(listener);
                    addNewMethod = handler.equals(dynamicHandler.getHandler());
                    if (addNewMethod) {
                        dynamicHandler.addMethod(methodName, method);
                    }
                }
                if (!addNewMethod) {
                    //第一次新增監聽
                    dynamicHandler = new DynamicHandler(handler);
                    dynamicHandler.addMethod(methodName, method);

                    //listener:代理物件
                    listener = Proxy.newProxyInstance(
                            listenerType.getClassLoader(),
                            new Class<?>[]{listenerType},
                            dynamicHandler);

                    //快取
                    listenerCache.put(info, listenerType, listener);
                }

                //繫結監聽
                Method setEventListenerMethod = view.getClass().getMethod(listenerSetter, listenerType);
                setEventListenerMethod.invoke(view, listener);
            }
        } catch (Throwable e) {
            LogUtils.e(e.getMessage(), e);
        }
    }

 
    //WeakReference？為什麼？
    //第一點：及時清理記憶體
    //第二點：Activity很有可能會被意外釋放(意外關閉，而這個時候你剛好執行程式碼到了控制元件的載入)
    //新增弱引用目的：為了防止物件意外被釋放關閉而產生異常（典型：空指標異常）
    public static class DynamicHandler implements InvocationHandler {
        private WeakReference<Object> handlerRef;
        private final HashMap<String, Method> methodMap = new HashMap<String, Method>(1);
        
       //動態代理 持有目標物件：代表Activity或者Fragment
        public DynamicHandler(Object handler) {
            this.handlerRef = new WeakReference<Object>(handler);
        }

        public void addMethod(String name, Method method) {
            methodMap.put(name, method);
        }

        public Object getHandler() {
            return handlerRef.get();
        }

        public void setHandler(Object handler) {
            this.handlerRef = new WeakReference<Object>(handler);
        }

        @Override
        public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
            Object handler = handlerRef.get();
            if (handler != null) {
                String methodName = method.getName();
                method = methodMap.get(methodName);
                //目的：確定代理需要的方法
                if (method != null) {
                    return method.invoke(handler, args);
                }
            }
            return null;
        }
    }
}
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ViewInjectInfo類作用儲存控制元件id類 將來我要擴充套件該類的屬性 控制功能邏輯

public class ViewInjectInfo {
    public Object value;
    public int parentId;

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (!(o instanceof ViewInjectInfo)) return false;

        ViewInjectInfo that = (ViewInjectInfo) o;

        if (parentId != that.parentId) return false;
        if (value == null) return (null == that.value);

        return value.equals(that.value);
    }

    @Override
    public int hashCode() {
        int result = value.hashCode();
        result = 31 * result + parentId;
        return result;
    }
}
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2.優化一下 優化第一步：設定方法訪問許可權：method.setAccessible(true); 允許訪問 private形式 優化第二步：快取優化

缺陷：註解類過於龐大。 框架變得越來越臃腫 第二個部分：XUtils框架3.0實現核心架構原理：整體架構做了重寫 就一個模組進行分析(ViewUtils模組) 問題：我們Android有多少個監聽，你就要定義多少個註解類？（XUtils2.0實現） 2.0註解類過於龐大。 框架變得越來越臃腫

            XUtils3.0之後整體架構大的改進和升級
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四大介面模組都通過簡單工廠類獲取，同受採用了靜態內部類單例模式

package org.xutils;

import android.app.Application;
import android.content.Context;

import org.xutils.common.TaskController;
import org.xutils.common.task.TaskControllerImpl;
import org.xutils.db.DbManagerImpl;
import org.xutils.http.HttpManagerImpl;
import org.xutils.image.ImageManagerImpl;
import org.xutils.view.ViewInjectorImpl;

import java.lang.reflect.Method;

import javax.net.ssl.HostnameVerifier;
import javax.net.ssl.HttpsURLConnection;


/**
 * Created by wyouflf on 15/6/10.
 * 任務控制中心, http, image, db, view注入等介面的入口.
 * 需要在在application的onCreate中初始化: x.Ext.init(this);
 */
public final class x {

    private x() {
    }

    public static boolean isDebug() {
        return Ext.debug;
    }

    public static Application app() {
        if (Ext.app == null) {
            try {
                // 在IDE進行佈局預覽時使用
                Class<?> renderActionClass = Class.forName("com.android.layoutlib.bridge.impl.RenderAction");
                Method method = renderActionClass.getDeclaredMethod("getCurrentContext");
                Context context = (Context) method.invoke(null);
                Ext.app = new MockApplication(context);
            } catch (Throwable ignored) {
                throw new RuntimeException("please invoke x.Ext.init(app) on Application#onCreate()"
                        + " and register your Application in manifest.");
            }
        }
        return Ext.app;
    }

    public static TaskController task() {
        return Ext.taskController;
    }

    public static HttpManager http() {
        if (Ext.httpManager == null) {
            HttpManagerImpl.registerInstance();
        }
        return Ext.httpManager;
    }

    public static ImageManager image() {
        if (Ext.imageManager == null) {
            ImageManagerImpl.registerInstance();
        }
        return Ext.imageManager;
    }

    public static ViewInjector view() {
        if (Ext.viewInjector == null) {
            ViewInjectorImpl.registerInstance();
        }
        return Ext.viewInjector;
    }

    public static DbManager getDb(DbManager.DaoConfig daoConfig) {
        return DbManagerImpl.getInstance(daoConfig);
    }
   //靜態內部類單例模式
    public static class Ext {
        private static boolean debug;
        private static Application app;
        private static TaskController taskController;
        private static HttpManager httpManager;
        private static ImageManager imageManager;
        private static ViewInjector viewInjector;

        private Ext() {
        }

        public static void init(Application app) {
            TaskControllerImpl.registerInstance();
            if (Ext.app == null) {
                Ext.app = app;
            }
        }

        public static void setDebug(boolean debug) {
            Ext.debug = debug;
        }

        public static void setTaskController(TaskController taskController) {
            if (Ext.taskController == null) {
                Ext.taskController = taskController;
            }
        }

        public static void setHttpManager(HttpManager httpManager) {
            Ext.httpManager = httpManager;
        }

        public static void setImageManager(ImageManager imageManager) {
            Ext.imageManager = imageManager;
        }

        public static void setViewInjector(ViewInjector viewInjector) {
            Ext.viewInjector = viewInjector;
        }

        public static void setDefaultHostnameVerifier(HostnameVerifier hostnameVerifier) {
            HttpsURLConnection.setDefaultHostnameVerifier(hostnameVerifier);
        }
    }

    private static class MockApplication extends Application {
        public MockApplication(Context baseContext) {
            this.attachBaseContext(baseContext);
        }
    }
}
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ViewUtils模組為例： 第一個優化改進：整體架構（採用面向介面程式設計 同時採用了一些設計模式） 第二個優化改進：ViewUtils事件註解結構類進行了改進（由使用者配置） 將所有註解事件進行了合併，有使用者指定對應的監聽 預設是OnClickListener監聽 效能提高了（之前是巢狀迴圈）

ViewInjectorImpl.java

/*
 * Copyright (c) 2013. wyouflf (wyouflf@gmail.com)
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.xutils.view;

import android.app.Activity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

import org.xutils.ViewInjector;
import org.xutils.common.util.LogUtil;
import org.xutils.view.annotation.ContentView;
import org.xutils.view.annotation.Event;
import org.xutils.view.annotation.ViewInject;
import org.xutils.x;

import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.util.HashSet;

public final class ViewInjectorImpl implements ViewInjector {

    private static final HashSet<Class<?>> IGNORED = new HashSet<Class<?>>();

    static {
        IGNORED.add(Object.class);
        IGNORED.add(Activity.class);
        IGNORED.add(android.app.Fragment.class);
        try {
            IGNORED.add(Class.forName("android.support.v4.app.Fragment"));
            IGNORED.add(Class.forName("android.support.v4.app.FragmentActivity"));
        } catch (Throwable ignored) {
        }
    }

    private static final Object lock = new Object();
    private static volatile ViewInjectorImpl instance;

    private ViewInjectorImpl() {
    }

    public static void registerInstance() {
        if (instance == null) {
            synchronized (lock) {
                if (instance == null) {
                    instance = new ViewInjectorImpl();
                }
            }
        }
        x.Ext.setViewInjector(instance);
    }

    @Override
    public void inject(View view) {
        injectObject(view, view.getClass(), new ViewFinder(view));
    }

    @Override
    public void inject(Activity activity) {
        //獲取Activity的ContentView的註解
        Class<?> handlerType = activity.getClass();
        try {
            ContentView contentView = findContentView(handlerType);
            if (contentView != null) {
                int viewId = contentView.value();
                if (viewId > 0) {
                    Method setContentViewMethod = handlerType.getMethod("setContentView", int.class);
                    setContentViewMethod.invoke(activity, viewId);
                }
            }
        } catch (Throwable ex) {
            LogUtil.e(ex.getMessage(), ex);
        }

        injectObject(activity, handlerType, new ViewFinder(activity));
    }

    @Override
    public void inject(Object handler, View view) {
        injectObject(handler, handler.getClass(), new ViewFinder(view));
    }

    @Override
    public View inject(Object fragment, LayoutInflater inflater, ViewGroup container) {
        // inject ContentView
        View view = null;
        Class<?> handlerType = fragment.getClass();
        try {
            ContentView contentView = findContentView(handlerType);
            if (contentView != null) {
                int viewId = contentView.value();
                if (viewId > 0) {
                    view = inflater.inflate(viewId, container, false);
                }
            }
        } catch (Throwable ex) {
            LogUtil.e(ex.getMessage(), ex);
        }

        // inject res & event
        injectObject(fragment, handlerType, new ViewFinder(view));

        return view;
    }

    /**
     * 從父類獲取註解View
     */
    private static ContentView findContentView(Class<?> thisCls) {
        if (thisCls == null || IGNORED.contains(thisCls)) {
            return null;
        }
        ContentView contentView = thisCls.getAnnotation(ContentView.class);
        if (contentView == null) {
            return findContentView(thisCls.getSuperclass());
        }
        return contentView;
    }

    @SuppressWarnings("ConstantConditions")
    private static void injectObject(Object handler, Class<?> handlerType, ViewFinder finder) {

        if (handlerType == null || IGNORED.contains(handlerType)) {
            return;
        }

        // 從父類到子類遞迴
        injectObject(handler, handlerType.getSuperclass(), finder);

        // inject view
        Field[] fields = handlerType.getDeclaredFields();
        if (fields != null && fields.length > 0) {
            for (Field field : fields) {

                Class<?> fieldType = field.getType();
                if (
                /* 不注入靜態欄位 */     Modifier.isStatic(field.getModifiers()) ||
                /* 不注入final欄位 */    Modifier.isFinal(field.getModifiers()) ||
                /* 不注入基本型別欄位 */  fieldType.isPrimitive() ||
                /* 不注入陣列型別欄位 */  fieldType.isArray()) {
                    continue;
                }

                ViewInject viewInject = field.getAnnotation(ViewInject.class);
                if (viewInject != null) {
                    try {
                        View view = finder.findViewById(viewInject.value(), viewInject.parentId());
                        if (view != null) {
                            field.setAccessible(true);
                            field.set(handler, view);
                        } else {
                            throw new RuntimeException("Invalid @ViewInject for "
                                    + handlerType.getSimpleName() + "." + field.getName());
                        }
                    } catch (Throwable ex) {
                        LogUtil.e(ex.getMessage(), ex);
                    }
                }
            }
        } // end inject view

        // inject event
        Method[] methods = handlerType.getDeclaredMethods();
        if (methods != null && methods.length > 0) {
            for (Method method : methods) {

                //注意：靜態方法不允許新增控制元件註解，私有方法允許訪問，非私有方法不允許訪問
                if (Modifier.isStatic(method.getModifiers())
                        || !Modifier.isPrivate(method.getModifiers())) {
                    continue;
                }

                //檢查當前方法是否是event註解的方法
                Event event = method.getAnnotation(Event.class);
                if (event != null) {
                    try {
                        // id引數
                        int[] values = event.value();
                        int[] parentIds = event.parentId();
                        int parentIdsLen = parentIds == null ? 0 : parentIds.length;
                        //迴圈所有id，生成ViewInfo並新增代理反射
                        for (int i = 0; i < values.length; i++) {
                            int value = values[i];
                            if (value > 0) {
                                ViewInfo info = new ViewInfo();
                                info.value = value;
                                info.parentId = parentIdsLen > i ? parentIds[i] : 0;
                                method.setAccessible(true);
                                EventListenerManager.addEventMethod(finder, info, event, handler, method);
                            }
                        }
                    } catch (Throwable ex) {
                        LogUtil.e(ex.getMessage(), ex);
                    }
                }
            }
        } // end inject event

    }

}
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在xUtils框架3.0之後，要求我們的方法必須是私有方法（注意：public不行） 讓註解方法只屬於當前類

  //注意：靜態方法不允許新增控制元件註解，私有方法允許訪問，非私有方法不允許訪問
                if (Modifier.isStatic(method.getModifiers())
                        || !Modifier.isPrivate(method.getModifiers())) {
                    continue;
                }

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/*
 * Copyright (c) 2013. wyouflf (wyouflf@gmail.com)
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.xutils.view;

import android.text.TextUtils;
import android.view.View;

import org.xutils.common.util.DoubleKeyValueMap;
import org.xutils.common.util.LogUtil;
import org.xutils.view.annotation.Event;

import java.lang.ref.WeakReference;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;

/*package*/ final class EventListenerManager {

    private final static long QUICK_EVENT_TIME_SPAN = 300;
    private final static HashSet<String> AVOID_QUICK_EVENT_SET = new HashSet<String>(2);

    static {
        AVOID_QUICK_EVENT_SET.add("onClick");
        AVOID_QUICK_EVENT_SET.add("onItemClick");
    }

    private EventListenerManager() {
    }

    /**
     * k1: viewInjectInfo
     * k2: interface Type
     * value: listener
     */
    private final static DoubleKeyValueMap<ViewInfo, Class<?>, Object>
            listenerCache = new DoubleKeyValueMap<ViewInfo, Class<?>, Object>();


    public static void addEventMethod(
            //根據頁面或view holder生成的ViewFinder
            ViewFinder finder,
            //根據當前註解ID生成的ViewInfo
            ViewInfo info,
            //註解物件
            Event event,
            //頁面或view holder物件
            Object handler,
            //當前註解方法
            Method method) {
        try {
            View view = finder.findViewByInfo(info);

            if (view != null) {
                // 註解中定義的介面，比如Event註解預設的介面為View.OnClickListener
                Class<?> listenerType = event.type();
                // 預設為空，註解介面對應的Set方法，比如setOnClickListener方法
                String listenerSetter = event.setter();
                if (TextUtils.isEmpty(listenerSetter)) {
                    listenerSetter = "set" + listenerType.getSimpleName();
                }


                String methodName = event.method();

                boolean addNewMethod = false;
                /*
                    根據View的ID和當前的介面型別獲取已經快取的介面例項物件，
                    比如根據View.id和View.OnClickListener.class兩個鍵獲取這個View的OnClickListener物件
                 */
                Object listener = listenerCache.get(info, listenerType);
                DynamicHandler dynamicHandler = null;
                /*
                    如果介面例項物件不為空
                    獲取介面物件對應的動態代理物件
                    如果動態代理物件的handler和當前handler相同
                    則為動態代理物件新增代理方法
                 */
                if (listener != null) {
                    dynamicHandler = (DynamicHandler) Proxy.getInvocationHandler(listener);
                    addNewMethod = handler.equals(dynamicHandler.getHandler());
                    if (addNewMethod) {
                        dynamicHandler.addMethod(methodName, method);
                    }
                }

                // 如果還沒有註冊此代理
                if (!addNewMethod) {

                    dynamicHandler = new DynamicHandler(handler);

                    dynamicHandler.addMethod(methodName, method);

                    // 生成的代理物件例項，比如View.OnClickListener的例項物件
                    listener = Proxy.newProxyInstance(
                            listenerType.getClassLoader(),
                            new Class<?>[]{listenerType},
                            dynamicHandler);

                    listenerCache.put(info, listenerType, listener);
                }

                Method setEventListenerMethod = view.getClass().getMethod(listenerSetter, listenerType);
                setEventListenerMethod.invoke(view, listener);
            }
        } catch (Throwable ex) {
            LogUtil.e(ex.getMessage(), ex);
        }
    }

    public static class DynamicHandler implements InvocationHandler {
        // 存放代理物件，比如Fragment或view holder
        private WeakReference<Object> handlerRef;
        // 存放代理方法
        private final HashMap<String, Method> methodMap = new HashMap<String, Method>(1);

        private static long lastClickTime = 0;

        public DynamicHandler(Object handler) {
            this.handlerRef = new WeakReference<Object>(handler);
        }

        public void addMethod(String name, Method method) {
            methodMap.put(name, method);
        }

        public Object getHandler() {
            return handlerRef.get();
        }

        @Override
        public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
            Object handler = handlerRef.get();
            if (handler != null) {

                String eventMethod = method.getName();
                if ("toString".equals(eventMethod)) {
                    return DynamicHandler.class.getSimpleName();
                }

                method = methodMap.get(eventMethod);
                if (method == null && methodMap.size() == 1) {
                    for (Map.Entry<String, Method> entry : methodMap.entrySet()) {
                        if (TextUtils.isEmpty(entry.getKey())) {
                            method = entry.getValue();
                        }
                        break;
                    }
                }

                if (method != null) {

                    if (AVOID_QUICK_EVENT_SET.contains(eventMethod)) {
                        long timeSpan = System.currentTimeMillis() - lastClickTime;
                        if (timeSpan < QUICK_EVENT_TIME_SPAN) {
                            LogUtil.d("onClick cancelled: " + timeSpan);
                            return null;
                        }
                        lastClickTime = System.currentTimeMillis();
                    }

                    try {
                        return method.invoke(handler, args);
                    } catch (Throwable ex) {
                        throw new RuntimeException("invoke method error:" +
                                handler.getClass().getName() + "#" + method.getName(), ex);
                    }
                } else {
                    LogUtil.w("method not impl: " + eventMethod + "(" + handler.getClass().getSimpleName() + ")");
                }
            }
            return null;
        }
    }
}
複製程式碼

簡化Activity中得監聽事件語句 // 註解中定義的介面，比如Event註解預設的介面為View.OnClickListener Class<?> listenerType = event.type(); // 預設為空，註解介面對應的Set方法，比如setOnClickListener方法 String listenerSetter = event.setter(); if (TextUtils.isEmpty(listenerSetter)) { listenerSetter = "set" + listenerType.getSimpleName(); } 否則 我們要在Activity中這麼寫

  @Event(listenerType = View.OnTouchListener.class, callbackMethod = "onTouch",listenerSetter = "setOnTouchListener",value={R.id.tv_title})
    private boolean touch(View v, MotionEvent event) {
        switch (event.getAction()) {
            case MotionEvent.ACTION_DOWN:
                Toast.makeText(this, "觸控按下!", Toast.LENGTH_LONG).show();
                break;

            default:
                break;
        }
        return true;
    }
複製程式碼