Android Question bluetoothmanager null pointer

[b4a-newbie]

Hello devs.

I am trying b4a and building a simple bt app to talk to an esp32.

Following other threads I did manage to get it working, but lately I have been getting this error that prevents b4a-bridge from replacing the app in the phone/emulator.

I have to manually forcefuly remove the app using adb before being able to compile-debug again.

A long press in the app icon and uninstall trial says "Package installer has stopped". Only adb can help removing it.

B4A Version 10.5
Target SDK Version 29

*** Service (starter) Create ***
bluetoothmanager_initialize (java line: 154)
java.lang.NullPointerException: Attempt to invoke virtual method 'boolean android.bluetooth.BluetoothAdapter.isEnabled()' on a null object reference
at anywheresoftware.b4a.objects.Serial$BluetoothAdmin.IsEnabled(Serial.java:405)

 

[Erel]

1. Don't waste your time on the emulator.
2. Something breaks the OS installed. Might be the icon file. Make sure that it is not too large.
3. If USB debug mode is enabled then use it to check the unfiltered logs and find the error message.