Analysis of the impact of the Multidex framework on the performance of Java libraries

The Multidex framework is a solution to support Android applications that use more than 65,536 methods.Before introducing its impact on the performance of the Java library, we first need to understand the working principle of Multidex. The DEX file applied by Android contains compiled bytecodes and related resources. Each DEX file can contain up to 65,536 methods.When the number of methods of application exceeds this limit, compile errors will be caused.To solve this problem, Android introduced the Multidex framework. The Multidex framework allows applications to load multiple DEX files during runtime and combine them into a single dex file.In this way, the application can bypass the number of methods. However, using the Multidex framework will have a certain impact on the performance of the application.Below we will discuss several influencing factors. 1. Application startup time extension: When the application uses Multidex, it requires extra time to load and merge multiple DEX files.This will lead to the extension of the start time of the application.In order to reduce delay, you can load the dex file by asynchronous loading. public class MyApplication extends Application { @Override protected void attachBaseContext(Context base) { super.attachBaseContext(base); MultiDex.install(this); } } 2. Increase memory consumption: merged multiple DEX files can cause increased memory consumption.Each DEX file takes up memory, and additional memory is required to perform combined operations when merging.If the application DEX file is large, it may lead to insufficient memory. 3. Increased class loading time: When the application uses Multidex, the loading time of the class will increase, because the system needs to load and analyze more DEX files.This may cause performance bottlenecks during runtime.In order to reduce the loading time, you can consider using optimization tools during the application construction process to reduce the number of methods. In summary, the Multidex framework has a certain impact on the performance of the Java class library, which is mainly reflected in the application startup time, increased memory consumption, and increasing class loading time.But these effects can be reduced by reasonable optimization methods.