erorr when react-native run-android

Question

when react-native run-android erorr

Task :app:installDebug FAILED

Task :app:installDebug FAILED

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/5.4.1/userguide/command_line_interface.html#sec:command_line_warnings 27 actionable tasks: 2 executed, 25 up-to-date

FAILURE: Build failed with an exception.

• What went wrong: Execution failed for task ':app:installDebug'.

  com.android.builder.testing.api.DeviceException: No connected devices!

• 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

BUILD FAILED in 2s

error Failed to install the app. Make sure you have an Android emulator running or a device connected. Run CLI with --verbose flag for more details. Error: Command failed: gradlew.bat app:installDebug -PreactNativeDevServerPort=8081

FAILURE: Build failed with an exception.

• What went wrong: Execution failed for task ':app:installDebug'.

  com.android.builder.testing.api.DeviceException: No connected devices!

• 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

Answer 1

react-native run-android is basically running ./gradlew installDebug. And the error says it all. There is no connected devices so it is not able to install the app.

Answer 2

There are not connected Android devices or emulators running.

If you are using an Android Emulator, make sure that your emulator is up and running. If you are running on a real device, make sure that the Developer Mode is enabled on your device and USB Debugging is enabled.

Run adb devices to see the list of currently connected Android instances.

Answer 3

Thank you very much for answering the question very soon. The simulator was not run The problem was solved