问题
I am trying to set the bluetooth discoverable mode to always on in Android 4.0. This should be possible with 4.0, with the command:
Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_DISCOVERABLE);
enableBtIntent.putExtra(BluetoothAdapter.EXTRA_DISCOVERABLE_DURATION, 0);
After executing this I get a dialog that asks if it is OK to start bluetooth with discoverybility always on. If I press yes the bluetooth setting will show the time 0:00 and it will NOT countdown. So far it looks fine, but after 2 min the bluetooth will change to unvisible mode again (if the previous setting was 2 min). Only if the previous setting was always on (set by manually going into the bluetooth settings) the Intent will work.
Does anyone know more about this? Is this a bug or is it how it is supposed to be? Should it not be possible to change the setting to always on by code?
回答1:
Nothing has changed as per the API docs . See this
It defaults to 120 seconds and max is 300 seconds
来源：https://stackoverflow.com/questions/8837386/setting-discoverable-mode-for-bluetooth-to-always-on-seam-to-fail