Kotlin 让人既爱有恨之编译速度优化
写kotlin很久了，一直以来都不太满意kotlin的编译速度，特别是项目中大量使用kapt 。但是也能忍受。但自从我的电脑让我玩坏了之后。编译速度一度让我怀疑人生，总感觉星哥顺走了我的内存条。可惜我这里监控盲区😂，废话不多说让我们看看具体步骤
优化前和优化后速度对
优化之前构建总耗时：241909ms·
构建时间：2021-05-14 15:55:48
开始构建----------------------
[:clean]:25ms
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构建结束----------------------
构建总耗时：241909ms
可以看到具体的耗时任务如上，主要是kapt相关的编译和编译kotlin代码
优化后 构建总耗时：22751ms
构建时间：2021-05-14 16:11:02
开始构建----------------------
[:clean]:2ms
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[:component:Chatjoy:compileChatjoyLocalDevelopDebugShaders]:0ms
[:component:Chatjoy:generateChatjoyLocalDevelopDebugAssets]:0ms
[:component:Chatjoy:mergeChatjoyLocalDevelopDebugAssets]:33ms
[:component:Chatjoy:compressChatjoyLocalDevelopDebugAssets]:16ms
[:component:Chatjoy:processChatjoyLocalDevelopDebugJavaRes]:0ms
[:component:Chatjoy:mergeChatjoyLocalDevelopDebugJavaResource]:790ms
[:component:Chatjoy:checkChatjoyLocalDevelopDebugDuplicateClasses]:42ms
[:component:Chatjoy:dexBuilderChatjoyLocalDevelopDebug]:2929ms
[:component:Chatjoy:mergeLibDexChatjoyLocalDevelopDebug]:20ms
[:component:Chatjoy:mergeProjectDexChatjoyLocalDevelopDebug]:91ms
[:component:Chatjoy:mergeChatjoyLocalDevelopDebugJniLibFolders]:430ms
[:component:Chatjoy:mergeChatjoyLocalDevelopDebugNativeLibs]:1875ms
[:component:Chatjoy:stripChatjoyLocalDevelopDebugDebugSymbols]:1093ms
[:component:Chatjoy:validateSigningChatjoyLocalDevelopDebug]:6ms
[:component:Chatjoy:writeChatjoyLocalDevelopDebugAppMetadata]:7ms
[:component:Chatjoy:writeChatjoyLocalDevelopDebugSigningConfigVersions]:7ms
[:component:Chatjoy:desugarChatjoyLocalDevelopDebugFileDependencies]:31ms
[:component:Chatjoy:mergeExtDexChatjoyLocalDevelopDebug]:736ms
[:component:Chatjoy:packageChatjoyLocalDevelopDebug]:1744ms
[:component:Chatjoy:assembleChatjoyLocalDevelopDebug]:0ms
构建结束----------------------
构建总耗时：22751ms
起飞了有木有哈哈！
优化具体步骤
1.在gradle.properties添加如下配置
//开启gradle并行编译，开启daemon，调整jvm内存大小
org.gradle.daemon=true
org.gradle.configureondemand=true
org.gradle.parallel=true
org.gradle.jvmargs=-Xmx4096m -XX:MaxPermSize=1024m -XX:+HeapDumpOnOutOfMemoryError -Dfile.encoding=UTF-8
//开启gradle缓存
org.gradle.caching=true
android.enableBuildCache=true
//开启kotlin的增量和并行编译
kotlin.incremental=true
kotlin.incremental.java=true
kotlin.incremental.js=true
kotlin.caching.enabled=true
kotlin.parallel.tasks.in.project=true //开启kotlin并行编译
//优化kapt
kapt.use.worker.api=true //并行运行kapt1.2.60版本以上支持
kapt.incremental.apt=true //增量编译 kapt1.3.30版本以上支持
//kapt avoiding 如果用kapt依赖的内容没有变化，会完全重用编译内容，省掉最上图中的:app:kaptGenerateStubsDebugKotlin的时间
kapt.include.compile.classpath=false
2.在app gradle添加如下配置
//kapt添加如下配置
kapt {
useBuildCache = true
javacOptions {
option("-Xmaxerrs", 500)
}
}
//在Android代码块中添加如下配置：（可优化transformClassDexBuilderForDebug的时间）
dexOptions {
preDexLibraries true
maxProcessCount 8
}
以上就是优化gradle编译时间的配置.其他不太重要的优化，好像对时间影响不算特别大。大家也可以根据自己的项目做针对优化。
查看自己项目中gradle编译中具体所用的时间
1.创建buildTrace.gradle文件
import java.text.SimpleDateFormat
/**
* 监控构建耗时
*
* 记录构建过程中的每个任务的耗时，并写入文件中 .build_history/buildTimeLog_yy_MM_dd_HH_mm_ss.log中
*
* 使用时将文件放在app目录下,然后在app/build.gradle中添加引用:
* apply from: "./buildTrace.gradle"
*/
class BuildTimeListener implements TaskExecutionListener, BuildListener {
private final String BUILD_LOG_FILE_DIR = ".build_history"
private final String BUILD_LOG_FILE_PATH = "buildTimeLog"
private long taskStartTime;
private long buildStartTime;
private int taskCounts = 0;
private StringBuilder sb = new StringBuilder()
private SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss")
private SimpleDateFormat sdf2 = new SimpleDateFormat("yyyy_MM_dd_HH_mm_ss")
BuildTimeListener() {
buildStartTime = System.currentTimeMillis()
//添加一些版本信息
// sb.append("codeTag:").append(ProjectConfig.codeTag).append("\n")
// sb.append("branch:").append(ProjectConfig.branch).append("\n")
// sb.append("versionName:").append(ProjectConfig.versionName).append("\n")
// sb.append("versionCode:").append(ProjectConfig.versionCode).append("\n")
sb.append("构建时间：" + sdf.format(new Date()) + "\n")
sb.append("开始构建----------------------\n")
}
@Override
void buildStarted(Gradle gradle) {
}
@Override
void settingsEvaluated(Settings settings) {
}
@Override
void projectsLoaded(Gradle gradle) {
}
@Override
void projectsEvaluated(Gradle gradle) {
}
/**
* 构建完成回调
* @param result The result of the build. Never null.
*/
@Override
void buildFinished(BuildResult result) {
if(taskCounts<5) return
long buildCost = System.currentTimeMillis() - buildStartTime
sb.append("构建结束----------------------\n")
sb.append("构建总耗时：" + buildCost + "ms")
//输出到文件
String text = sb.toString()
writeToFile(BUILD_LOG_FILE_PATH, text)
}
/**
* 任务执行开始
* @param task The task about to be executed. Never null.
*/
@Override
void beforeExecute(Task task) {
taskStartTime = System.currentTimeMillis();
}
/**
* 任务执行结束
* @param task The task which was executed. Never null.
* @param state The task state. If the task failed with an exception, the exception is available in this
*/
@Override
void afterExecute(Task task, TaskState state) {
long cost = System.currentTimeMillis() - taskStartTime;
System.out.println("任务：" + task.name + "," + task.path + ",耗时：" + cost);
sb.append("[" + task.path + "]:" + cost + "ms\n")
taskCounts++
}
private void writeToFile(String fname, String text) {
File dir = new File(BUILD_LOG_FILE_DIR)
if (!dir.exists()) {
dir.mkdir()
}
File file = new File(BUILD_LOG_FILE_DIR + File.separator + fname + "_" + sdf2.format(new Date()) + ".log")
file.write(text, true)
}
}
gradle.addListener new BuildTimeListener()
2.在app项目中引用
apply from: 'buildTrace.gradle'
大家如果有更好的方案，还请多多指教！
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