Safely remove an Android Activity

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I found my answer. To remove an activity, let the name of the activity is activity:

  1. Remove the activity.java file from src folder (java/your.package.name folder for AndroidStudio)
  2. Remove the activity.xml file from layouts folder (layout folder for AndroidStudio)
  3. Remove the activity.xml file from res/menu folder (this is an optional folder)
  4. Remove the <activity></activity> block of the activity from the manifest file
  5. If the <activity> block in the manifest file has a reference (usually in android:label tag) remove the referenced value (usually from values/strings.xml).

According to answers from @ojonugwa ochalifu and @Md Tarik Mahmud you should also right click on app folder then Refractor -> Remove Unused Resources

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