android 获取蓝牙各种连接状态

蓝牙之间的配对及连接

//蓝牙已打开
		if(mAdapter.isEnabled()){
			
			int a2dp = mAdapter.getProfileConnectionState(BluetoothProfile.A2DP); // 可操控蓝牙设备，如带播放暂停功能的蓝牙耳机
			int headset = mAdapter.getProfileConnectionState(BluetoothProfile.HEADSET); // 蓝牙头戴式耳机，支持语音输入输出
			int health = mAdapter.getProfileConnectionState(BluetoothProfile.HEALTH); // 蓝牙穿戴式设备
			int GATT = mAdapter.getProfileConnectionState(BluetoothProfile.GATT);
			Log.e("lqq","a2dp="+a2dp+",headset="+headset+",health="+health);
			// 查看是否蓝牙是否连接到三种设备的一种，以此来判断是否处于连接状态还是打开并没有连接的状态
			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) {
				setBtState(BluetoothAdapter.STATE_CONNECTED);
			} else if (flag == -1) {
				//蓝牙手机相互配对连接
				NetworkInfo netInfo = ((ConnectivityManager) mContext.getSystemService(Context.CONNECTIVITY_SERVICE)).getNetworkInfo(ConnectivityManager.TYPE_BLUETOOTH);
				if (netInfo == null) {
					setBtState(BluetoothAdapter.STATE_ON); // discontinued
				} else {
					setBtState(BluetoothAdapter.STATE_CONNECTED); // 系统内部，返回连接与否
				}
			}
		} else {
			setBtState(BluetoothAdapter.STATE_OFF);
		}