蓝牙耳机：getProfileConnectionState始终返回连接状态

Question

我试图检查是否有蓝牙耳机连接到设备

    BluetoothAdapter mAdapter;
    mAdapter = BluetoothAdapter.getDefaultAdapter();
    Log.d("TAG","HEADSET: " + mAdapter.getProfileConnectionState(BluetoothProfile.HEADSET));
    Log.d("TAG","HEALTH: " + mAdapter.getProfileConnectionState(BluetoothProfile.HEALTH));
    Log.d("TAG","A2DP: " + mAdapter.getProfileConnectionState(BluetoothProfile.A2DP));

这总是返回HEADSET 2（已连接），Health 0（已断开连接）和A2DP 0（已断开连接）。无论是否连接了蓝牙耳机都没关系，只有当蓝牙被禁用时，耳机连接状态才为0