I want to change the path of android:name=".MainActivity" to "settings.MainActivity"

Question

AndroidManifest.xml I want to change the path of android:name=".MainActivity" to "settings.MainActivity"

android:name=".MainActivity"to settings.MainActivity

I created a "settings" folder inside the "src" file and moved the "MainActivity.java" file inside the "settings" file. There is an error. setContentView(R.layout.activity_main) R cannot be resolved to a variable