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androidlistviewarraylistlistadaptersettext

Update TextView in Android with amount of bluetooth devices found via ListAdapter or BluetoothAdapter

I want to create a TextView in an Android app which shows how many bluetooth devices are found and list them in the UI.

Inside the MainActivity(only acivity), there is an ArrayList inside a private class ListAdapter extends BaseAdapter. Besides in that class there is also a private BluetoothAdapter.LeScanCallback with onLeScan method that includes ListAdapter.notifyDataSetChanged(). The ListAdapter uses a listView to bind the results of bluetooth scanning to the UI. The issue now is that I don't know how to create a trigger that sends the currently found/displayed (and constantly changing) amount of devices in a simple TextView above (!) the ArrayList and updates it every time the amount of devices in the list varies.

Do you have any suggestions? I have only found examples from different cases, and mostly with updating through buttons.

Solution

  • You should crate an listener for when a new Bluetooth scan is done. That listener should update the UI, TextView. Read more about Android Callbacks here.