need this permission:
<uses-permission android:name="android.permission.BLUETOOTH"></uses-permission>
and code snap:
AudioManager audioManager = (AudioManager)context.getSystemService(Context.AUDIO_SERVICE);
if (audioManager.isWiredHeadsetOn()
|| audioManager.isBluetoothA2dpOn()
|| audioManager.isBluetoothScoOn() ) {
// headset connected
}
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