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Android动态化技术优化

news 来源：原创 2025/6/8 17:16:46

Android动态化技术优化

一、WebView优化基础

1.1 WebView性能瓶颈

初始化耗时
内存占用高
页面加载慢
白屏问题

1.2 WebView基本配置

class OptimizedWebView : WebView {init {// 开启硬件加速setLayerType(LAYER_TYPE_HARDWARE, null)// 配置WebSettingssettings.apply {// 开启JavaScriptjavaScriptEnabled = true// DOM存储domStorageEnabled = true// 缓存模式cacheMode = WebSettings.LOAD_DEFAULT// 开启应用缓存setAppCacheEnabled(true)// 允许混合内容mixedContentMode = WebSettings.MIXED_CONTENT_ALWAYS_ALLOW}}
}

二、WebView性能优化

2.1 预加载机制

class WebViewPool private constructor() {private val webViewPool = Queue<WebView>()fun prepare(context: Context) {if (webViewPool.isEmpty()) {val webView = WebView(context)// 预加载配置webView.loadUrl("about:blank")webViewPool.offer(webView)}}fun acquire(): WebView {return webViewPool.poll() ?: throw IllegalStateException("Pool is empty")}companion object {@Volatileprivate var instance: WebViewPool? = nullfun getInstance() = instance ?: synchronized(this) {instance ?: WebViewPool().also { instance = it }}}
}

2.2 离线包加载

class OfflinePackageManager {fun loadOfflinePackage(url: String): String? {return try {// 1. 检查本地是否存在离线包val localPath = getLocalPackagePath(url)if (isPackageValid(localPath)) {return localPath}// 2. 下载离线包downloadPackage(url)// 3. 解压并校验extractAndVerify(url)getLocalPackagePath(url)} catch (e: Exception) {null}}
}

三、Hybrid开发优化

3.1 JSBridge实现

class JSBridge {@JavascriptInterfacefun callNative(action: String, params: String, callback: String) {when (action) {"getLocation" -> {// 获取位置信息val location = LocationManager.getLocation()// 通过JavaScript回调evaluateJavascript("javascript:$callback('$location')")}"takePhoto" -> {// 调用相机CameraManager.takePhoto { result ->evaluateJavascript("javascript:$callback('$result')")}}}}
}

3.2 通信优化

数据序列化优化
通信协议优化
异步处理机制

四、性能监控

4.1 页面加载监控

class WebViewMonitor {private var pageStartTime: Long = 0fun onPageStarted() {pageStartTime = System.currentTimeMillis()}fun onPageFinished() {val loadTime = System.currentTimeMillis() - pageStartTime// 上报加载时间reportLoadTime(loadTime)}private fun reportLoadTime(time: Long) {// 实现上报逻辑}
}

4.2 内存监控

class MemoryMonitor {fun checkMemoryUsage(webView: WebView) {val runtime = Runtime.getRuntime()val usedMemory = runtime.totalMemory() - runtime.freeMemory()if (usedMemory > MEMORY_THRESHOLD) {// 触发内存回收webView.clearCache(true)System.gc()}}
}

五、实战案例

5.1 电商App商品详情页优化

class ProductDetailOptimizer {private lateinit var webView: WebViewprivate val offlineManager = OfflinePackageManager()fun optimizeProductDetail() {// 1. 预加载WebViewwebView = WebViewPool.getInstance().acquire()// 2. 加载离线包val localHtml = offlineManager.loadOfflinePackage(PRODUCT_DETAIL_URL)if (localHtml != null) {webView.loadUrl("file://$localHtml")} else {webView.loadUrl(PRODUCT_DETAIL_URL)}// 3. 注入优化脚本injectOptimizationScript()}private fun injectOptimizationScript() {val script = """// 图片懒加载function lazyLoadImages() {const images = document.querySelectorAll('img[data-src]');const observer = new IntersectionObserver((entries) => {entries.forEach(entry => {if (entry.isIntersecting) {const img = entry.target;img.src = img.dataset.src;observer.unobserve(img);}});});images.forEach(img => observer.observe(img));}// DOM优化function optimizeDOM() {// 使用文档片段const fragment = document.createDocumentFragment();// 批量操作DOM// ...}""".trimIndent()webView.evaluateJavascript(script, null)}
}