Completely reset Android emulator:
- Open Android AVD Manager.
- Run the emulator you want to use reset.
- Check the "Wipe user data" box.
- Click "Run."
If you just want to uninstall the application:
- Run the emulator.
- Open the Android settings app.
- Select "Applications" ("Applications" on Android 4.0 or later)
- Select "Application Management" (only on Android 3.2 or lower)
- Select the application you want to uninstall.
- Click Delete
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