feat: Allow fullscreen immersive mode in splash screen

Feature Request

Describe the Feature Request

Android has an option to hide navigation bar and action bar to allow for full screen experience, they call it immersive: https://developer.android.com/training/system-ui/immersive

This is common for many apps and we can do it now in MainActivity.java however while splash screen is launching, it is still showing the navbar. Recent changes with addition of splashFullScreen allow us to hide action bar however.

Platform Support Requested

• Android
• iOS
• Electron
• Web

Describe Preferred Solution

ideally we could make another flag that allows to hide it?

Describe Alternatives

Not sure if any exist

Related Code

I was able to implement this in my MainActivity.java file like this:

package com.asimetriq.skimitar;

import android.graphics.Color;
import android.os.Build;
import android.os.Bundle;
import android.view.View;

import com.asimetriq.skimitar.ASQPlugins.GoogleAuth;
import com.asimetriq.skimitar.ASQPlugins.SafeArea;
import com.getcapacitor.BridgeActivity;
import com.getcapacitor.Plugin;

import java.util.ArrayList;

public class MainActivity extends BridgeActivity {


  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    hideSystemUI();

    /**
     * Initialize capacitor bridge
     */
    this.init(savedInstanceState, new ArrayList<Class<? extends Plugin>>() {{
      // Additional plugins you've installed go here
      // Ex: add(TotallyAwesomePlugin.class);
      add(GoogleAuth.class);
      add(SafeArea.class);
    }});
  }

  @Override
  public void onWindowFocusChanged(boolean hasFocus) {
    super.onWindowFocusChanged(hasFocus);
    if (hasFocus) {
      hideSystemUI();
    }
  }

  /**
   * Hide android navbar and toolbar for full screen experience
   */
  private void hideSystemUI() {
    final int flags = View.SYSTEM_UI_FLAG_LAYOUT_STABLE
            | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
            | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
            | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION
            | View.SYSTEM_UI_FLAG_FULLSCREEN
            | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY;
    View decorView = getWindow().getDecorView();

    decorView.setSystemUiVisibility(flags);
    decorView.setOnSystemUiVisibilityChangeListener((int visibility) ->  {
      if((visibility & View.SYSTEM_UI_FLAG_FULLSCREEN) == 0) {
        decorView.setSystemUiVisibility(flags);
      }
    });
  }
}

Additional Context

[0xAsimetriq]

I am open to implement this if you give me some pointers and we agree on how this implementation looks.

[ionitron-bot[bot]]

Thanks for the issue! This issue is being locked to prevent comments that are not relevant to the original issue. If this is still an issue with the latest version of Capacitor, please create a new issue and ensure the template is fully filled out.