It means you’re trying to install an app with the same packageName as an app that’s already installed on the emulator, but the one you’re trying to install has a lower versionCode (integer value for your version number).
You might have installed from a separate copy of the code where the version number was higher than the copy you’re working with right now. In either case, either:
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uninstall the currently installed copy
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or open up your phone’s Settings > Application Manager to determine the version number for the installed app, and increment your
<manifest android:versionCodeto be higher in the AndroidManifest. -
or https://stackoverflow.com/a/13772620/632951