Provides Dispatchers.Main context for Android applications.

Read Guide to UI programming with coroutines for tutorial on this module.


R8 and ProGuard rules are bundled into this module. R8 is a replacement for ProGuard in Android ecosystem, it is enabled by default since Android gradle plugin 3.4.0 (3.3.0-beta also had it enabled). For best results it is recommended to use a recent version of R8, which produces a smaller binary.

When optimizations are enabled with R8 version 1.6.0 or later the following debugging features are permanently turned off to reduce the size of the resulting binary:

  • ../../docs/debugging.md#debug-mode

  • ../../docs/debugging.md#stacktrace-recovery

  • The internal assertions in the library are also permanently removed.

You can examine the corresponding rules in this resources/META-INF/com.android.tools/r8-from-1.6.0/coroutines.pro file.


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Provides Dispatchers.Main context for Android applications.