Android检查蓝牙是否已连接 [英] Android check if Bluetooth connected

问题描述

我已经在互联网上搜索了很长一段时间，但是找不到我想要的东西.

I am searching for this on the internet for quite a while, but I can't find what I am looking for.

如果我的设备已经连接到蓝牙设备(/在我启动我的应用程序之前)，我该如何找到我的应用程序.

How can I find out with my app, if my device is already connected to a Bluetooth device (/ was before I start my app).

我希望有类似 bool BluetoothAdapter.isPaired();

推荐答案

如果仅对建立与任意蓝牙设备的连接感兴趣，则可以使用BluetoothAdapter.getProfileConnectionState(profile):

If you are only interested if a connection to an arbitrary bluetooth device is established you can use the BluetoothAdapter.getProfileConnectionState(profile):

    adapter = BluetoothAdapter.getDefaultAdapter();
    if (adapter != null && adapter.isEnabled()) {
        int[] profiles = {BluetoothProfile.A2DP, BluetoothProfile.HEADSET, BluetoothProfile.HEALTH};
        boolean connectionExists = false;
        for (int profileId : profiles) {
            if (BluetoothAdapter.getProfileConnectionState(profileId) == 
                                    BluetoothProfile.STATE_CONNECTED) {
                connectionExists = true;
                break;
            }
        }
    }

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