获取当前连接的蓝牙设备

仅作为记录

获取当前连接的蓝牙设备代码如下：

权限：

    <uses-permission android:name="android.permission.BLUETOOTH"/>
    <uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />

方法：

    //检查已连接的蓝牙设备
    private void getConnectBt() {
        int a2dp = bluetoothAdapter.getProfileConnectionState(BluetoothProfile.A2DP);
        int headset = bluetoothAdapter.getProfileConnectionState(BluetoothProfile.HEADSET);
        int health = bluetoothAdapter.getProfileConnectionState(BluetoothProfile.HEALTH);
        int flag = -1;
        if (a2dp == BluetoothProfile.STATE_CONNECTED) {
            flag = a2dp;
        } else if (headset == BluetoothProfile.STATE_CONNECTED) {
            flag = headset;
        } else if (health == BluetoothProfile.STATE_CONNECTED) {
            flag = health;
        }
        if (flag != -1) {
            bluetoothAdapter.getProfileProxy(MainActivity.this, new BluetoothProfile.ServiceListener() {
                @Override
                public void onServiceDisconnected(int profile) {
                    Toast.makeText(MainActivity.this,profile+"",Toast.LENGTH_SHORT).show();
                }

                @Override
                public void onServiceConnected(int profile, BluetoothProfile proxy) {
                    List mDevices = proxy.getConnectedDevices();
                    if (mDevices != null && mDevices.size() > 0) {
                        for (BluetoothDevice device : mDevices) {
                            Toast.makeText(MainActivity.this, device.getName() + "," + device.getAddress(), Toast.LENGTH_SHORT).show();
                        }
                    } else {
                        Toast.makeText(MainActivity.this, "mDevices is null", Toast.LENGTH_SHORT).show();
                    }
                }
            }, flag);
        }
    }

说明：只要成功连接耳机之类的媒体设备，再调用这个方法就能获取到已连接的蓝牙设备名称、mac地址等信息。如果在没有连接任何设备调用该方法不会有任何反应（toast或者log）