解决Program type already present: com.rom4ek.arcnavigationview.R编译报错

我之前碰到过完全一样的情况！成功编译完应用后，我修改了图标颜色，结果应用突然卡顿，只好关掉了模拟器。但之后重新启动模拟器运行项目时，Gradle一直构建失败，模拟器里始终只显示应用的旧版本，新做的改动根本没生效。

当时的报错信息如下：

build failed 11 s 936 ms
Run build 10 s 560 ms
Program type already present: com.rom4ek.arcnavigationview.R
org.gradle.workers.internal.DefaultWorkerExecutor$WorkExecutionException: A failure occurred while executing com.android.build.gradle.internal.transforms.DexArchiveBuilderTransform$DexConversionWorkAction
org.gradle.tooling.BuildException: Failed to process C:\Users\Desktop\Project\testapp\app\build\intermediates\javac\debug\classes
com.android.builder.dexing.DexArchiveBuilderException: Failed to process C:\Users\Desktop\Project\testapp\app\build\intermediates\javac\debug\classes
com.android.builder.dexing.DexArchiveBuilderException: Error while dexing.
com.android.tools.r8.CompilationFailedException: Compilation failed to complete
com.android.tools.r8.utils.AbortException: Error: Program type already present: com.rom4ek.arcnavigationview.R

最后我通过以下步骤解决了问题：

• 点击顶部菜单栏的 Build
• 选择 Clean Project
• 清理完成后再选择 Rebuild Project

等Rebuild完成后重新运行模拟器，新改动就正常生效了，Gradle的构建错误也彻底消失了。

内容的提问来源于stack exchange，提问作者Sach E