ScreenBrightness | ScreenBrightness allows you to monitor brightness | iOS library

I want to change brightness of my screen when I'm opening some fragment which placed in my activity so I placed so code for this in onActivityCreated (I also tried to placed it onResume). But I want to return my screen to previous brightness when user is closing this fragment. But for now brightness applies for all activity. How to apply brittleness only for fragment? Or record brightness result and retrun it, when fragment is closed?

Goal

• If an already connected bluetooth device disconnects, and an Activity is already running, close the Activity

Problem

• When the bluetooth device connection state changes through BluetoothAdapterProperties: CONNECTION_STATE_CHANGE, it seems like a new Activity is created or the current one restarts.

There is nothing in the code that listens and/or should react to bluetooth connection state changes.

The problem manifests itself in the use of BroadcastReceivers which in turn starts the Activity using intents. For some reason the Activity keep running through its lifecycle, spawning up new windows, even if the only change in bluetooth connectivity is BluetoothAdapterProperties: CONNECTION_STATE_CHANGE

I've tested this solely on a Nexus 6P with Android N. I have no idea yet what kind of implications this implementation means for any other devices yet. But I at least need to get this working on one device.

UPDATE

I have done a fair bit of experimentation and found that if I don't register the BroadcastReceiver in AndroidManifest, the problem with onDestroy being called disappears. But, I want to be able to react to Bluetooth connecting devices, so that I can launch my activity and then process input. If the activity gets destroyed every time a new device connects/disconnects, this won't work at all. What's the reasoning for having the BroadcastReceiver finishing an activity if it's already running and can I control that behaviour?

UPDATE 2

I can also conclude that disabling the statically declared BroadcastReceiver using this method https://stackoverflow.com/a/6529365/975641 doesn't improve things. As soon as the Manifest-BroadcastReceiver catches the ACL_CONNECTED intent from Android, and start my custom activity, it will ruthlessly call onDestroy on it when the connection state changes (which is usually just before an ACL_DISCONNECTED). It does not matter if I have ACL_DISCONNECTED declared in the Manifest or not. As long as I have my receiver listening for ACL_CONNECTED intents and I launch my Activity based on that, onDestroy will be called when the connection state changes. So frustrating.

Manifest

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I have problems with getting permission and I cant seem to understand as to why I don't get the permission to change the screen brightness.

My manifest looks like this:

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Goals

• If a bluetooth device connects, and no Activity is running, start Activity
• If a bluetooth device connects, and an Activity is already running, connect to the already running Activity

Problem

• As soon as a device connects, a new Activity starts. I have not been able to make the app reuse the same Activity.

What I have managed to solve

• If a bluetooth device connects, and no Activity is running, start Activity

The problem manifests itself in the use of BroadCastReceivers which in turn starts the Activity using intents. For some reason the Activity keep running through its lifecycle, spawning up new windows, when a new device connects.

I've tested this solely on a Nexus 6P with Android N. I have no idea yet what kind of implications this implementation means for any other devices yet. But I at least need to get this working on one device.

Manifest