使用通过ListAdapter或BluetoothAdapter找到的大量蓝牙设备更新Android中的TextView

Question

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.

Answer 1

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.