需求背景之前的某一天我们项目经理给我说，客户想要APP有换肤的功能，我们的OA项目要支持换肤功能，于是我就去~~Google搜索~~学习了一波~大家应该都知道，我们常用的手机QQ是支持换肤功能的，而且皮肤主题可以在线下载使用！没错，QQ不是把皮肤主题写死在APP内部的，而是通过插件形式进行换肤功能实现的，而且整个过程不需要重启APP或Activity。也就是说，我们需要做到以下几点：资源的动态加载（可以加载外部的皮肤包插件）实时换肤（无需重启APP或Activity）换肤后的状态保存（下次进入时还是上一次换肤后的效果：持久化加载皮肤插件的配置）换肤效果图什么是皮肤插件包？皮肤插件包其实就是不包含Java代码（当然，如果你不嫌皮肤插件包apk的体积变大，你也可以留着）的一个apk安装包。换肤功能介绍我们APP内换肤针对的一般有以下几种资源：View的背景（background：color、drawable、mipmap）图片资源（src：drawable、mipmap）文字的颜色（textColor：color）插件换肤原理（动态加载皮肤资源）关键点（系统源码）AssetManager.javaResources.javaAppCompatDelegate.javaAppCompatDelegateImpl.javaLayoutInflater.Factory2.javaAppCompatViewInflater.java换肤流程我们加载插件apk皮肤中的资源，其实就是要解析apk包，那么我们怎么解析呢？平时我们获取app的资产文件时是通过AssetManager这个类进行加载的，我们的换肤插件apk也是通过这个类进行加载的。获取color、drawable、mipmap资源则是通过Resources类的一系列方法进行获取的。创建AndroidLibraryModuleNewNewModule...CreateNewModule导入依赖在skinModule中的build.gradle文件内导入必要的依赖（你也可以使用你自己的Log日志打印工具类）dependencies{//AndroidX库：https://github.com/androidx/androidximplementation'androidx.appcompat:appcompat:1.3.1'implementation'androidx.core:core-ktx:1.7.0'implementation'androidx.activity:activity-ktx:1.4.0'implementation'androidx.fragment:fragment-ktx:1.3.6'//日志打印框架（可选）：https://github.com/JakeWharton/timberimplementation'com.jakewharton.timber:timber:4.7.1'}新建Kotlin类文件新建activity、attr、callback、factory、manager、util这几个包新建如下kotlin类SupportSkinActivity.kt：支持换肤的Activity基类，使用者可以继承该类以获得换肤的实现SkinAttr.kt：皮肤属性SkinAttrSupport.kt：皮肤属性支持SkinAttrType.kt：皮肤属性类型SkinView.kt：皮肤View，包括需要换肤的View以及需要换肤的皮肤属性信息ISkinChangedListener.kt：换肤监听器ISkinChangingCallback.kt：换肤回调DefaultSkinConfigFactory.kt：默认皮肤配置工厂SkinConfigFactory.kt：皮肤配置工厂SkinFactory.kt：皮肤工厂SkinManager.kt：皮肤管理器，在Application中进行init初始化SkinResourcesManager.kt：皮肤资源管理器AppCompatActivity.kt：AppCompatActivity支持换肤的扩展函数项目目录创建好的项目目录如下图所示实现源码SupportSkinActivity.kt/***author:ALonelyCat*github:https://github.com/anjiemo/SunnyBeach*time:2021/11/19*desc:支持换肤的Activity基类，使用者可以继承该类以获得换肤的实现*/openclassSupportSkinActivity:AppCompatActivity(),ISkinChangedListener{@CallSuperoverridefunonCreate(savedInstanceState:Bundle?){hookActivity(this)super.onCreate(savedInstanceState)}overridefunonSkinChanged(){}@CallSuperoverridefunonDestroy(){super.onDestroy()removeActivityHook(this)}}SkinAttr.kt/***author:ALonelyCat*github:https://github.com/anjiemo/SunnyBeach*time:2021/11/19*desc:皮肤属性*/classSkinAttr(privatevalresName:String,privatevalresType:String,vartype:SkinAttrType){funapply(view:View?){type.apply(view,resType,resName)}}SkinAttrSupport.kt/***author:ALonelyCat*github:https://github.com/anjiemo/SunnyBeach*time:2021/11/19*desc:皮肤属性支持*/objectSkinAttrSupport{/***获取皮肤属性*/fungetSkinAttrs(resources:Resources,attrs:AttributeSet):List<SkinAttr>{valskinAttrs:MutableList<SkinAttr>=ArrayList()vari=0valn=attrs.attributeCountwhile(i<n){//例：id、layout_width、layout_height、background、color、drawablevalattrName=attrs.getAttributeName(i)//例：@2131296320、@2131297009、@2131230904valattrValue=attrs.getAttributeValue(i)Timber.d("getSkinAttrs：===>attrNameis%sattrValueis%s",attrName,attrValue)if(attrValue.startsWith("@")){varresId=0try{resId=attrValue.substring(1).toInt()}catch(e:NumberFormatException){e.printStackTrace()}catch(e:IndexOutOfBoundsException){e.printStackTrace()}//如果是无效的资源id则跳过if(resId==Resources.ID_NULL){i++continue}//获取资源类型名称valresType=resources.getResourceTypeName(resId)//获取资源的名称valresName=resources.getResourceEntryName(resId)Timber.d("getSkinAttrs：===>resTypeis%sresNameis%s",resType,resName)//具有换肤的前缀，是支持的换肤资源类型if(resName.startsWith(SkinConfigFactory.SKIN_PREFIX)){valattrType=getSupportAttrType(attrName)//如果不是支持换肤的属性类型，则跳过if(attrType==null){i++continue}skinAttrs.add(SkinAttr(resName,resType,attrType))}}i++}returnskinAttrs}/***通过资源属性名称，获取支持换肤的属性类型*/privatefungetSupportAttrType(attrName:String):SkinAttrType?{for(attrTypeinSkinAttrType.values()){if(attrType.resType==attrName){returnattrType}}returnnull}}SkinAttrType.kt/***author:ALonelyCat*github:https://github.com/anjiemo/SunnyBeach*time:2021/11/19*desc:皮肤属性类型*/enumclassSkinAttrType(valresType:String){/***background*/BACKGROUND("background"){overridefunapply(view:View?,resType:String,resName:String){valdrawable:Drawable?=getResourceManager().getDrawableByName(resType,resName)if(view!=null&&drawable!=null){view.background=drawable}}},/***src*/SRC("src"){overridefunapply(view:View?,resType:String,resName:String){valdrawable:Drawable?=getResourceManager().getDrawableByName(resType,resName)if(viewisImageView&&drawable!=null){view.setImageDrawable(drawable)}}},/***textColor*/TEXT_COLOR("textColor"){overridefunapply(view:View?,resType:String,resName:String){valcolorStateList:ColorStateList?=getResourceManager().getColorByResName(resType,resName)if(viewisTextView&&colorStateList!=null){view.setTextColor(colorStateList)}}};fungetResourceManager()=SkinManager.instance.resourcesManagerabstractfunapply(view:View?,resType:String,resName:String)}SkinView.kt/***author:ALonelyCat*github:https://github.com/anjiemo/SunnyBeach*time:2021/11/19*desc:皮肤View，包括需要换肤的View以及需要换肤的皮肤属性信息*/classSkinView(privatevalview:View,privatevalattrs:List<SkinAttr>){funapply(){attrs.forEach{it.apply(view)}}}ISkinChangedListener.kt/***author:ALonelyCat*github:https://github.com/anjiemo/SunnyBeach*time:2021/11/19*desc:换肤监听器*/interfaceISkinChangedListener{/***皮肤变了*/funonSkinChanged()}ISkinChangingCallback.kt/***author:ALonelyCat*github:https://github.com/anjiemo/SunnyBeach*time:2021/11/19*desc:换肤回调*/interfaceISkinChangingCallback{/***开始更换皮肤*/funonStartChangeSkin()/***更换皮肤错误*/funonChangeSkinError(e:Exception)/***更换皮肤完成*/funonChangeSkinComplete()/***默认的换肤回调*/classDefaultSkinChangingCallbackImpl:ISkinChangingCallback{overridefunonStartChangeSkin(){}overridefunonChangeSkinError(e:Exception){}overridefunonChangeSkinComplete(){}}}DefaultSkinConfigFactory.kt/***author:ALonelyCat*github:https://github.com/anjiemo/SunnyBeach*time:2021/11/19*desc:默认皮肤配置工厂*/classDefaultSkinConfigFactory(appContext:Application):SkinConfigFactory{privatevalsp=appContext.getSharedPreferences(PREF_NAME,Context.MODE_PRIVATE)overridefunsavePluginPath(path:String?){sp.edit{putString(KEY_PLUGIN_PATH,path)}}overridefunsavePluginPkg(pkg:String?){sp.edit{putString(KEY_PLUGIN_PKG,pkg)}}overridefunsaveSuffix(suffix:String?){sp.edit{putString(KEY_PLUGIN_SUFFIX,suffix)}}overridefungetPluginPath():String=sp.getString(KEY_PLUGIN_PATH,null)?:""overridefungetPluginPkg():String=sp.getString(KEY_PLUGIN_PKG,null)?:""overridefungetSuffix():String=sp.getString(KEY_PLUGIN_SUFFIX,null)?:""overridefunclearSkinConfig(){sp.edit{clear()}}}SkinConfigFactory.kt/***author:ALonelyCat*github:https://github.com/anjiemo/SunnyBeach*time:2021/11/19*desc:皮肤配置工厂*/interfaceSkinConfigFactory{/***保存皮肤插件的路径*/funsavePluginPath(path:String?)/***保存皮肤插件的包名*/funsavePluginPkg(pkg:String?)/***保存皮肤的后缀*/funsaveSuffix(suffix:String?)/***获取皮肤插件的路径*/fungetPluginPath():String/***获取皮肤插件的包名*/fungetPluginPkg():String/***获取皮肤的后缀*/fungetSuffix():String/***清空皮肤配置*/funclearSkinConfig()companionobject{/***插件换肤相关*/constvalSKIN_PREFIX="skin_"constvalPREF_NAME="skin_plugin"constvalKEY_PLUGIN_PATH="plugin_path"constvalKEY_PLUGIN_PKG="plugin_pkg"constvalKEY_PLUGIN_SUFFIX="plugin_suffix"/***插件包的路径（默认在设备sdcard的根目录下，可根据实际情况进行设置）*/valSKIN_PLUGIN_PATH=Environment.getExternalStorageDirectory().toString()+File.separator+"sunnybeach.skin"/***插件包的包名*/constvalSKIN_PLUGIN_PKG="cn.android52.sunnybeach.skin"}}SkinFactory.kt/***author:ALonelyCat*github:https://github.com/anjiemo/SunnyBeach*time:2021/11/19*desc:皮肤工厂*/classSkinFactory(privatevaldelegate:AppCompatDelegate,privatevallistener:ISkinChangedListener?):LayoutInflater.Factory2{privatevalsConstructorSignature=arrayOf(Context::class.java,AttributeSet::class.java)privatevalsClassPrefixList=arrayOf("android.widget.","android.view.","android.webkit.")privatevalsConstructorMap:MutableMap<String,Constructor<outView?>>=arrayMapOf()privatevalmConstructorArgs=arrayOfNulls<Any?>(2)privatevarmCreateViewMethod:Method?=nullprivatevalsCreateViewSignature=arrayOf(View::class.java,String::class.java,Context::class.java,AttributeSet::class.java)privatevalmCreateViewArgs=arrayOfNulls<Any>(4)overridefunonCreateView(name:String,context:Context,attrs:AttributeSet):View?{returnnull}overridefunonCreateView(parent:View?,name:String,context:Context,attrs:AttributeSet):View?{//系统有没有使用setFactory//完成AppCompatfactory的工作varview:View?=null//请参阅AppCompatDelegateImpl类，使用反射调用createView方法try{if(mCreateViewMethod==null){mCreateViewMethod=delegate.javaClass.getMethod("createView",*sCreateViewSignature)}//mCreateViewArgsmCreateViewArgs[0]=parentmCreateViewArgs[1]=namemCreateViewArgs[2]=contextmCreateViewArgs[3]=attrsview=mCreateViewMethod!!.invoke(delegate,*mCreateViewArgs)asView?}catch(e:Exception){e.printStackTrace()}//收集当前View需要换肤的属性集合valskinAttrs:List<SkinAttr>=SkinAttrSupport.getSkinAttrs(context.resources,attrs)//如果当前View需要换肤的属性集合为空，则代表该View不需要换肤，直接返回该Viewif(skinAttrs.isEmpty()){returnnull}if(view==null){view=createViewFromTag(context,name,attrs)}if(view!=null){//当前View具有需要换肤的属性，将该View和需要换肤的属性集合保存起来injectSkin(view,skinAttrs)}returnview}/***请参阅AppCompatViewInflater类中的实现*/privatefuncreateViewFromTag(context:Context,name:String,attrs:AttributeSet):View?{varattrName=nameif(attrName=="view"){attrName=attrs.getAttributeValue(null,"class")}returntry{mConstructorArgs[0]=contextmConstructorArgs[1]=attrsif(-1==attrName.indexOf('.')){for(iinsClassPrefixList.indices){valview:View?=createViewByPrefix(context,attrName,sClassPrefixList[i])if(view!=null){returnview}}null}else{createViewByPrefix(context,name,null)}}catch(e:Exception){//Wedonotwanttocatchthese,letsreturnnullandlettheactualLayoutInflater//trynull}finally{//Don'tretainreferencesoncontext.mConstructorArgs[0]=nullmConstructorArgs[1]=null}}/***请参阅AppCompatViewInflater类中的实现*/@Throws(ClassNotFoundException::class,InflateException::class)privatefuncreateViewByPrefix(context:Context,name:String,prefix:String?):View?{varconstructor=sConstructorMap[name]returntry{if(constructor==null){//Classnotfoundinthecache,seeifit'sreal,andtrytoadditvalclazz=Class.forName(if(prefix!=null)prefix+nameelsename,false,context.classLoader).asSubclass(View::class.java)constructor=clazz.getConstructor(*sConstructorSignature)sConstructorMap[name]=constructor}constructor!!.isAccessible=trueconstructor.newInstance(*mConstructorArgs)}catch(e:Exception){//Wedonotwanttocatchthese,letsreturnnullandlettheactualLayoutInflater//trynull}}/***将该View和需要换肤的属性集合保存起来*/privatefuninjectSkin(view:View,skinAttrs:List<SkinAttr>){valmanager=SkinManager.instancevarskinViews:MutableList<SkinView>?=manager.getSkinView(listener)if(skinViews==null){skinViews=ArrayList<SkinView>()manager.addSkinView(listener,skinViews)}skinViews.add(SkinView(view,skinAttrs))//检测当前是否需要自动换肤，如果需要则换肤if(manager.isNeedChangeSkin()){manager.skinChange(listener)}}}SkinManager.kt/***author:ALonelyCat*github:https://github.com/anjiemo/SunnyBeach*time:2021/11/19*desc:皮肤管理器，在Application中进行init初始化*/classSkinManagerprivateconstructor():LifecycleObserver{privatelateinitvarmAppContext:ApplicationprivatevarmSkinResourcesManager:SkinResourcesManager?=nullprivatevalmListeners:MutableList<ISkinChangedListener>=arrayListOf()privatevalmSkinViewMaps:MutableMap<ISkinChangedListener?,MutableList<SkinView>>=arrayMapOf()privatelateinitvarmSkinConfigFactory:SkinConfigFactoryprivatevarmCurrentPath:String=""privatevarmCurrentPkg:String=""//后缀privatevarmSuffix:String=""valresourcesManager:SkinResourcesManagerget()=if(!usePlugin()){SkinResourcesManager(mAppContext.resources,mAppContext.packageName,mSuffix)}elsemSkinResourcesManager!!/***请在Application中初始化SkinManager*SkinConfigFactory是可选项，若未指定皮肤配置工厂则使用默认皮肤工厂，该工厂使用SharedPreferences存储皮肤插件信息*/@JvmOverloadsfuninit(appContext:Application,factory:SkinConfigFactory=DefaultSkinConfigFactory(appContext)){mAppContext=appContextmSkinConfigFactory=factorytry{valpluginPath=mSkinConfigFactory.getPluginPath()valpluginPkg=mSkinConfigFactory.getPluginPkg()mSuffix=mSkinConfigFactory.getSuffix()valfile=File(pluginPath)if(file.exists()){loadPlugin(pluginPath,pluginPkg)}}catch(e:Exception){e.printStackTrace()mSkinConfigFactory.clearSkinConfig()}}/***是否已经初始化*/privatefunisInitialized()=::mAppContext.isInitialized&&::mSkinConfigFactory.isInitialized/***加载插件*/@Throws(Exception::class)funloadPlugin(skinPluginPath:String,skinPluginPkg:String){if(skinPluginPath==mCurrentPath&&skinPluginPkg==mCurrentPkg){return}valassetManager=AssetManager::class.java.newInstance()//获取addAssetPath方法valaddAssetPathMethod=assetManager.javaClass.getMethod("addAssetPath",String::class.java)//调用addAssetPath方法，第一个参数是当前对象，第二个参数是插件包的路径addAssetPathMethod.invoke(assetManager,skinPluginPath)valsuperResources=mAppContext.resourcesvaldisplayMetrics=superResources.displayMetricsvalconfiguration=superResources.configurationvalresources=Resources(assetManager,displayMetrics,configuration)mSkinResourcesManager=SkinResourcesManager(resources,skinPluginPkg)mCurrentPath=skinPluginPathmCurrentPkg=skinPluginPkg}/***获取皮肤视图*/fungetSkinView(listener:ISkinChangedListener?):MutableList<SkinView>?{returnmSkinViewMaps[listener]}/***添加皮肤视图*/funaddSkinView(listener:ISkinChangedListener?,views:MutableList<SkinView>){mSkinViewMaps[listener]=views}/***注册监听器*/funregisterListener(listener:ISkinChangedListener){mListeners.add(listener)}/***取消注册监听器，避免内存泄漏*1、移除监听回调*2、移除View集合*/fununRegisterListener(listener:ISkinChangedListener){mListeners.remove(listener)mSkinViewMaps.remove(listener)}/***换皮肤*/funchangeSkin(suffix:String):SkinManager{clearPluginInfo()mSuffix=suffixmSkinConfigFactory.saveSuffix(suffix)notifyChangedListener()returnthis}/***重置皮肤状态*/funresetSkin(){clearPluginInfo()notifyChangedListener()}/***清除皮肤插件信息*/privatefunclearPluginInfo(){mCurrentPath=""mCurrentPkg=""mSuffix=""mSkinConfigFactory.clearSkinConfig()updatePluginInfo(mCurrentPath,mCurrentPkg)}/***使用默认换肤配置*/funchangeSkin(lifecycle:Lifecycle,callback:ISkinChangingCallback?){changeSkin(SkinConfigFactory.SKIN_PLUGIN_PATH,SkinConfigFactory.SKIN_PLUGIN_PKG,lifecycle,callback)}/***改变皮肤*/funchangeSkin(skinPluginPath:String,skinPluginPkg:String,lifecycle:Lifecycle,callback:ISkinChangingCallback?){check(isInitialized()){"PleaseinitializeinApplication!"}performChangeSkin(this,skinPluginPath,skinPluginPkg,lifecycle,callback)}/***执行换肤*/privatefunperformChangeSkin(skinManager:SkinManager,pluginPath:String,pluginPkg:String,lifecycle:Lifecycle,callback:ISkinChangingCallback?){lifecycle.coroutineScope.launchWhenResumed{callback?.onStartChangeSkin()try{withContext(Dispatchers.IO){skinManager.loadPlugin(pluginPath,pluginPkg)}}catch(e:Exception){e.printStackTrace()callback?.onChangeSkinError(e)return@launchWhenResumed}skinManager.notifyChangedListener()skinManager.updatePluginInfo(pluginPath,pluginPkg)callback?.onChangeSkinComplete()}}/***保存插件信息*/privatefunupdatePluginInfo(path:String?,pkg:String?){mSkinConfigFactory.savePluginPath(path)mSkinConfigFactory.savePluginPkg(pkg)}/***通知更新*/privatefunnotifyChangedListener(){mListeners.forEach{skinChange(it)it.onSkinChanged()}}/***皮肤变了*/funskinChange(listener:ISkinChangedListener?){valskinViews=mSkinViewMaps[listener]if(skinViews==null){Timber.d("skinChange：===>skinViewsisnull")//此处必须返回，否则无法换肤成功return}skinViews.forEach{it.apply()}}/***是否需要换肤*/funisNeedChangeSkin():Boolean=usePlugin()||useSuffix()/***使用插件*/privatefunusePlugin():Boolean=mCurrentPath.trim().isNotEmpty()/***使用后缀*/privatefunuseSuffix():Boolean=mSuffix.trim().isNotEmpty()companionobject{@JvmStaticvalinstancebylazy{SkinManager()}@JvmStaticfunhookActivity(activity:AppCompatActivity,listener:ISkinChangedListener?){valinflater=LayoutInflater.from(activity)hookFactorySet(inflater)valfactory=SkinFactory(activity.delegate,listener)LayoutInflaterCompat.setFactory2(inflater,factory)}privatefunhookFactorySet(inflater:LayoutInflater){//利用反射去修改mFactorySet的值为false，防止抛出异常//IllegalStateException：AfactoryhasalreadybeensetonthisLayoutInflatertry{@SuppressLint("SoonBlockedPrivateApi")valmFactorySet=LayoutInflater::class.java.getDeclaredField("mFactorySet")mFactorySet.isAccessible=truemFactorySet[inflater]=false}catch(e:NoSuchFieldException){e.printStackTrace()}catch(e:IllegalAccessException){e.printStackTrace()}}}}SkinResourcesManager.kt/***author:ALonelyCat*github:https://github.com/anjiemo/SunnyBeach*time:2021/11/19*desc:皮肤资源管理器*/classSkinResourcesManager(privatevalresources:Resources,privatevalpkgName:String,privatevalsuffix:String=""){@SuppressLint("UseCompatLoadingForDrawables")fungetDrawableByName(resType:String?,name:String):Drawable?{Timber.d("getDrawableByName：===>pkgNameis%s",pkgName)try{valfixName=appendSuffix(name)valresId=resources.getIdentifier(fixName,resType,pkgName)Timber.d("getDrawableByName：===>resTypeis%snameis%sresIdis%s",resType,fixName,resId)returnresources.getDrawable(resId)}catch(e:NotFoundException){e.printStackTrace()}returnnull}@SuppressLint("UseCompatLoadingForColorStateLists")fungetColorByResName(resType:String?,name:String):ColorStateList?{Timber.d("getColorByResName：===>pkgNameis%s",pkgName)try{valfixName=appendSuffix(name)valresId=resources.getIdentifier(fixName,resType,pkgName)Timber.d("getColorByResName：===>resTypeis%snameis%sresIdis%s",resType,fixName,resId)returnresources.getColorStateList(resId)}catch(e:NotFoundException){e.printStackTrace()}returnnull}/***追加后缀*/privatefunappendSuffix(name:String):String{varfixName=nameif(!TextUtils.isEmpty(suffix)){fixName+="_$suffix"}returnfixName}}AppCompatActivity.kt/***author:ALonelyCat*github:https://github.com/anjiemo/SunnyBeach*time:2021/11/19*desc:AppCompatActivity支持换肤的扩展函数*//***劫持AppCompatActivity，使其拥有换肤功能，必须在AppCompatActivity的onCreate方法之前调用*/funAppCompatActivity.hookActivity(action:ISkinChangedListener){valmanager=SkinManager.instancemanager.registerListener(action)SkinManager.hookActivity(this,action)}/***取消AppCompatActivity的监听，避免内存泄漏，请在AppCompatActivity的onDestroy方法中调用*/funAppCompatActivity.removeActivityHook(action:ISkinChangedListener){valmanager=SkinManager.instancemanager.unRegisterListener(action)}引入方式将skin这个Module以Library的形式引入app的Module中，例：dependencies{implementationproject(':skin')}使用前初始化Application在Application中调用SkinManager.instance.init(this)初始化皮肤管理器。classApp:Application(){overridefunonCreate(){super.onCreate()SkinManager.instance.init(this)}}别忘了在appmodule的AndroidManifest.xml文件中注册该Application哦~<?xmlversion="1.0"encoding="utf-8"?><manifestxmlns:android="http://schemas.android.com/apk/res/android"package="cn.android52.sunnybeach.skin"><applicationandroid:name=".App"></application></manifest>Activity1、最简单的使用方式就是直接继承自SupportSkinActivity，让其作为基类，其它代码的按照正常业务进行编写即可，例：classTestActivity:SupportSkinActivity(){overridefunonCreate(savedInstanceState:Bundle?){super.onCreate(savedInstanceState)setContentView(R.layout.test_activity)//获取SkinManager实例valmanager=SkinManager.instance//执行manager.changeSkin(lifecycle,this)}}2、在编写的基类中添加如下代码即可实现换肤功能，例：classSupportSkinActivity:AppCompatActivity(),ISkinChangedListener{overridefunonCreate(savedInstanceState:Bundle?){//该函数的调用必须在super.onCreate(savedInstanceState)之前hookActivity(this)super.onCreate(savedInstanceState)}overridefunonSkinChanged(){//皮肤变了}overridefunonStartChangeSkin(){//开始更换皮肤}overridefunonChangeSkinError(e:Exception){//更换皮肤错误}overridefunonChangeSkinComplete(){//更换皮肤完成}overridefunonDestroy(){super.onDestroy()//移除Activity的Hook，避免内存泄漏removeActivityHook(this)}}layout布局文件在布局文件中只需要在需要换肤的资源名称前添加skin_前缀即可，插件包中的资源名称与当前需要换肤的app中使用的资源名称保持一致。皮肤插件包（新建一个普通的appmodule）Tips：去除新建module时默认添加的依赖可以减小皮肤插件包的体积。将需要换肤的资源copy到该module中，然后直接签名打包成apk文件即可。为了避免用户误安装，可以将该apk的后缀进行修改，例：sunnybeach.skin