dex2oat

Google is moving from Dalvik to ART (Android Runtime). I was trying to understand, how it is going to improve the performance. The best explanation I found is the below image: One of the main component which has changed is dexopt to dex2oat . Since I don't have much idea about these, can anyone explain the difference and how this is going to improve the performance? dexopt does some optimizations on the dex file. It does things like replacing a virtual invoke instruction with an optimized version that includes the vtable index of the method being called, so that it doesn't have to perform a

Prior to Android 5.0 I was able to load DEX files dynamically using DexClassLoader and calling loadClass() method but with the latest Android version I get a ClassNotFoundException . Here is what I am doing: Generate DEX file. ../android-sdk/android-sdk-linux_86/build-tools/21.1.1/dx --dex --output=bin/output.dex bin/output.jar Create a DexClassLoader. DexClassLoader cl = new DexClassLoader( dexFile.getAbsolutePath(), odexFile.getAbsolutePath(), null, mContext.getClassLoader()); Call cl.loadClass("myMethod"); I am aware that ART uses dex2oat to generate an ELF file that is the loaded by ART

极力推荐Android 开发大总结文章：欢迎收藏 程序员Android 力荐 ，Android 开发者需要的必备技能 用户希望 APP 能够快速响应并加载。 一个启动速度慢的 APP 不符合用户期望，可能会令用户失望，并且可能会导致用户对您的应用程序评价不佳，甚至会卸载你的应用。 本文将讨论如何优化应用的启动时间，首先我们需要了解 APP 启动的相关内容。 通过本篇文章，您将学习到以下内容 App 启动模式分类 应用中冷启动避免白屏、黑屏方案 Framework 层解决冷启动白屏、黑屏方案 App 启动优化原理 App 启动优化简介 App 启动优化方案 在 PMS中 App 启动优化方案 1. App 启动模式分类 App 启动模式分以下 三 类 ： 1.冷启动 2.热启动 3.温热启动 1.冷启动 APP 从零开始， APP 启动之前，系统没有为此 APP 创建独立进程。比如：设备启动后， APP 第一次 Launch 或者 APP 被 Kill 掉后的重启。这种类型的启动优化存在很大挑战，因为 Android 系统或应用还有其他更多的后台进程在运行。 启动流程大致如下： 点击Launcher 上的 icon开加载app --> 立即显示白屏或黑屏等 --> Application onCreate --> Activity Init ----> Activity