audioFX | Level Audio Effects using the Web Audio API

I am making a reminder app with Xamarin. I am trying to send notifications, however every time I run the app I can only push one notification no matter how many reminders the user creates.

Here is my notification code:

I am using android equalizer API to create a high pass filter. But even if I set every band to -1500 it does not seems to work. The audio is playing well but no eq effects. Here is my code.

I'm having trouble enabling reverb on an audio track in my Android app. Does anyone actually know how this works? I've been looking all over the place but the documentation is pretty bad and contradicts itself at multiple points. I've seen old posts about this, but none of them contain any actual answers. Only thing I know so far is that instantiating an effect with session ID 0 and then applying to the audio track is deprecated (well, according to AudioEffect docs, but not PresetReverb docs). Here is my code:

I made this switch on one of my fragment to switch from the dark theme to light theme. The only problem is that when I leave fragment with the switch on when I go back to the fragment, the switch is off instead of being on like I left it.

Here are the images.

When I go on the fragment: Fragment Switch Off

When I flip the switch: Fragment Switch On

Then I leave the Fragment, then come back to the Fragment: Fragment Switch off while supposed to be on

Her is my code:

SettingsFragment.java: