Mobile APP quality optimization framework - Booster

Thermal paper REVIEW | Click on the title to read

Author: booster (project addresses see text at the end)
link: https: //juejin.im/post/5cea22ebf265da1bb564d4d7

Brief introduction

Booster is a mobile application designed specifically for ease of use, lightweight and scalable quality optimization framework, which aims mainly to solve the complexity and improve the APP brings performance, reliability, package size and other issues.

Why is the Booster?

Quality Optimization is a problem for all application developers have faced for DAU tens of millions APP, the ten thousandth of the rate would mean the collapse of thousands of users are affected, for the long-line of the driver, the driver stability of APP related to the driver's safety and income, so should not be underestimated.

With the rapid development of business, business complexity and improve, we began to think about:

How to ensure the continued quality of APP?
After the collapse of APP, how to quickly locate the problem belongs to the line of business?
Can you identify potential quality issues before on-line in advance?
APP can be no intrusion of global quality optimization without the need to push each line of business?

Based on these considerations, Booster emerged after more than one year continuously polished, Booster success. Due to the current open source project based on static analysis of only a handful in quality optimization, coupled with quality optimization for APP developers, high threshold, so we chose to Booster open, hope that more developers and users benefit from .

Functions and Features

Dynamically loaded modules

To support the need to optimize differentiation, Booster enables dynamic loading of modules, in order to select without the use of a developer arranged in the specified module, see: Booster-Task-All, All-Booster-Transform.

Third-party libraries injection

Booster making process optimization, you may need to inject some specific classes or libraries, in order to solve the problem injection dependency management classes, Booster provides VariantProcessor SPI allows developers to easily expand, please refer to: ThreadVariantProcessor.kt # L12

Performance Testing

Caton rate APP is an important indicator when measuring applications running performance, in order to identify potential Caton problem in advance, Booster achieve the performance detected by static analysis, and generate visual reports to help develop the problem in locating, following figure It shows:

640?wx_fmt=other

The principle is that by analyzing all the class files, build a global Call Graph, and then find out (related methods Application, the four major components, View, Widget, etc.) link in the main thread calls from the Call Graph, and then in these links and then outputs the report in units of categories.

See: Booster-the Transform-lint.

Multi-threaded optimization

Numerous lines of business APP common thread overload problem, and thread management has been one of the developers of the most troublesome problem, although you can go to avoid such problems by setting strict code standards occur, but for complex organizational structures to manufacturers say, a huge cost to implement, and for third-party SDK, the code specification is bloated. In order to completely solve this problem, Booster bytecode by modifying the thread pool to achieve global optimization during compilation, and the thread is to be renamed.

The following sample code:

Rename thread results as shown below:

640?wx_fmt=other

See: Booster-the Transform-the Thread

SharedPreferences optimization

For Android developers, SharedPreferences almost everywhere, and modified in the main thread SharedPreferences will lead Caton even ANR, in order to completely solve this problem, Booster for APP in the global replacement instructions.

详见：booster-transform-shared-preferences。

Constant Field Delete

Whether it is resource index, or other constant field, after the compilation is completed, the value does not exist (except for reflection), therefore, the resource index field instruction Booster will replace constant access instruction, the other constant field is removed from the class , can improve run-time performance on the one hand, on the other hand, can reduce the package volume of the resource index (R) seemingly trivial, in fact, occupy a lot of space, drops to the owner, for example, the resource index related classes there are thousands, after constant field deleted, reduced by about 1MB.

详见：booster-transform-shrink。

Toast Bug fix

In order to solve the bug exists in the Android 7.1: 30150688, Booster of APP in Toast.show () method call instruction global replacement.

See: Booster-the Transform-Toast.

Resource Compression

APP package volume is also a very important indicator, the APP installation, picture resources accounted for a large proportion, usually the case, the picture quality is reduced by 10% -20% will not affect the visual effects, therefore, Booster lossy compression to reduce the size of the image, and the image size is smaller, faster loading, occupies the less memory.
Booster offers two compression schemes:

pngquant lossy compression (requires its own command-line tool pngquant)
cwebp lossy compression (already built)

Two programs have advantages and disadvantages, compatibility issues pngquant program does not exist, but the compression rate is slightly lower than WebP, and WebP version compatibility issues exist in the system, the whole, lossy compression effect is very significant, with drops owners an example, APP package volume is reduced by about 10 MB.

另外，像 Android Support Library 中包含有大量的图片资源，而且支持多种屏幕尺寸，对于 APP 而言，相同的图片资源，保留最大尺寸的即可。以 Android Support Library 为例，去冗余后，APP 包体积减小了 1MB 左右。

详见：booster-task-compression。

WebView 预加载

为了解决 WebView 初始化导致的卡顿问题，Booster 通过注入指令的方式，在主线程空闲时提前加载 WebView。

除上以上特性外，Booster 还提供了一些辅助开发的功能，如：检查依赖项中是否包含 SNAPSHOT 版本等等。

快速入门

在 buildscript 的 classpath 中引入 Booster 插件，然后启用该插件：

buildscript {
    ext.booster_version = '0.4.3'
    repositories {
        google()
        mavenCentral()
        jcenter()
    }
    dependencies {
        classpath "com.didiglobal.booster:booster-gradle-plugin:$booster_version"
        classpath "com.didiglobal.booster:booster-task-all:$booster_version"
        classpath "com.didiglobal.booster:booster-transform-all:$booster_version"
    }
}

apply plugin: 'com.android.application'
apply plugin: 'com.didiglobal.booster'

然后通过执行 assemble task 来构建一个优化过的应用包：

$ ./gradlew assembleRelease

构建完成后，在 build/reports/ 目录下会生成相应的报告：

build/reports/
├── booster-task-compression
│   └── release
│       └── report.txt
├── booster-transform-lint
│   └── release
│       ├── com
│       └── org
├── booster-transform-shared-preferences
│   └── release
│       └── report.txt
├── booster-transform-shrink
│   └── release
│       └── report.txt
├── booster-transform-thread
│   └── release
│       └── report.txt
└── booster-transform-toast
    └── release
        └── report.txt

项目地址：https://github.com/didi/booster

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