Android Studio升級(jí)到哦最新版3.6.1后，新建了個(gè)項(xiàng)目，發(fā)現(xiàn)無(wú)法執(zhí)行Java類(lèi)的main方法。試了網(wǎng)上的各種方法，比如切換gradle離線模式、gradle.properties中添加android.enableAapt2=false等，我還嘗試了重新情況Gradle緩存、重新下載gradle等方式，都沒(méi)用。

環(huán)境

android studio版本：3.6.1
gradle版本：5.6.4
gradle插件版本：3.6.1

錯(cuò)誤提示

11:41:35 PM: Executing task 'TxtUtil.main()'...

Executing tasks: [TxtUtil.main()] in project /Users/tinytongtong/Documents/workspace/as/self/BlogDemo

FAILURE: Build failed with an exception.

* Where:
Initialization script '/private/var/folders/qw/8_p1t59142d0xntgn799rt1c0000gn/T/TxtUtil_main__.gradle' line: 20

* What went wrong:
A problem occurred configuring project ':app'.
> Could not create task ':app:TxtUtil.main()'.
   > SourceSet with name 'main' not found.

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.

* Get more help at https://help.gradle.org

Deprecated Gradle features were used in this build, making it incompatible with Gradle 6.0.
Use '--warning-mode all' to show the individual deprecation warnings.
See https://docs.gradle.org/5.6.4/userguide/command_line_interface.html#sec:command_line_warnings

BUILD FAILED in 207ms
11:41:35 PM: Task execution finished 'TxtUtil.main()'.

解決方案：

方案一：暫時(shí)的替代方案

Run "XXX.main()" with Coverage

方案二：修改.idea/gradle.xml文件

Android Studio使用gradle作為構(gòu)建工具，所以歸根到底還是gradle配置的問(wèn)題。我先找一個(gè)沒(méi)問(wèn)題的項(xiàng)目，再打開(kāi)新創(chuàng)建的項(xiàng)目，對(duì)比著看他們的gradle配置。經(jīng)過(guò)對(duì)比和嘗試，發(fā)現(xiàn).idea/gradle.xml文件內(nèi)部不同，并且參照老項(xiàng)目進(jìn)行修改是有效的。

老項(xiàng)目的.idea/gradle.xml：

<?xml version="1.0" encoding="UTF-8"?>
<project version="4">
 <component name="GradleMigrationSettings" migrationVersion="1" />
 <component name="GradleSettings">
 <option name="linkedExternalProjectsSettings">
 <GradleProjectSettings>
 <option name="delegatedBuild" value="false" />
 <option name="testRunner" value="PLATFORM" />
 <option name="distributionType" value="DEFAULT_WRAPPED" />
 <option name="externalProjectPath" value="$PROJECT_DIR$" />
 <option name="modules">
  <set>
  <option value="$PROJECT_DIR$" />
  <option value="$PROJECT_DIR$/app" />
  ...
  </set>
 </option>
 <option name="resolveModulePerSourceSet" value="false" />
 </GradleProjectSettings>
 </option>
 </component>
</project>

新項(xiàng)目的.idea/gradle.xml:

<?xml version="1.0" encoding="UTF-8"?>
<project version="4">
 <component name="GradleMigrationSettings" migrationVersion="1" />
 <component name="GradleSettings">
 <option name="linkedExternalProjectsSettings">
 <GradleProjectSettings>
 <option name="testRunner" value="PLATFORM" />
 <option name="distributionType" value="DEFAULT_WRAPPED" />
 <option name="externalProjectPath" value="$PROJECT_DIR$" />
 <option name="modules">
  <set>
  <option value="$PROJECT_DIR$" />
  <option value="$PROJECT_DIR$/app" />
  </set>
 </option>
 <option name="resolveModulePerSourceSet" value="false" />
 </GradleProjectSettings>
 </option>
 </component>
</project>

經(jīng)過(guò)對(duì)比發(fā)現(xiàn)，新項(xiàng)目的<GradleProjectSettings>標(biāo)簽下少了<option name="delegatedBuild" value="false" />這行配置，然后給新項(xiàng)目添加這行配置，運(yùn)行代碼發(fā)現(xiàn)成功了。

根據(jù)配置的字面意思理解，這個(gè)設(shè)置的意思是不委托g(shù)radle進(jìn)行構(gòu)建?，F(xiàn)實(shí)效果也是加了這行配置之后就是jvm執(zhí)行Java類(lèi)的main方法了，而不是gradle當(dāng)做task來(lái)執(zhí)行了。

知識(shí)點(diǎn)補(bǔ)充，參考方法

Android Studio 3.0 無(wú)法運(yùn)行Java代碼main() 方法的解決方案

Android Studio 升級(jí)到3.0 以后發(fā)現(xiàn) 運(yùn)行Java 代碼中的main()方法的時(shí)候grandle 就會(huì)報(bào)錯(cuò)的問(wèn)題

解決方法 :

打開(kāi)工程目錄下的下圖標(biāo)注的文件:

打開(kāi)文件后 在文件中添加

android.enableAapt2=false


最后同步一下 OK!

總結(jié)

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