JFrame does not show top bar after it is exported as application

Is your question answered by this previous thread: https://discourse.processing.org/t/android-please-tell-me-how-to-make-the-title-bar-visible-in-the-processing-app-help-me/40634 ?

Try running this code in Android mode:

void setup() {
  size(width,height);
  background(109);
}

void draw() {  
}

Change manifest.xml file to look like this:
manifest .NoActionBar.FullScreen was deleted from android:theme.

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