I am working with React-Native, Android, and Genymotion on Mac. When I run react-native run-android I get this lines at the end of the launch operation:
1.use custom sdk path in genymotion.(Suppose this one won't work means,Try to execute the second one)
2.Manually use this command to execute(SDK PATH/adb she ll am start -n/Package name/MainActivity).
C:\Users\AppData\Local\Android\Sdk/platform-tools/adb she ll am start -n com.example/com.example.ManiActivity
And try to run the application by using react-native run-android.