FAILURE: Build failed with an exception. * What went wrong: Execution failed for task ':app:installDebug'. > com.android.builder.testing.api.DeviceException: com.android.ddmlib.InstallException: Failed to establish session * Try: Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output
Could not install the app on the device, read the error above for details.
Make sure you have an Android emulator running or a device connected and have
set up your Android development environment:
https://facebook.github.io/React-native/docs/android-setup.html
解決方法