Android开发，如何知道Wi-Fi已连接了一个热点

      如题，在Android Q(Android 10)以前，通过传统手段是能够轻松知道的。但是Android Q(Android 10)对设备的系统标识（MAC、IMEI、序列号）增加了更多的限制和修改，当我们用传统手段去获取时就行不通了。如果用户不授予相关权限，得到wifi信息中很多字段（如bssid、ssid将是默认值），那如何判断呢？
1：获取WifiManager

// Kotlin扩展函数
val Context.wifi: WifiManager
    get() = applicationContext.getSystemService(Context.WIFI_SERVICE) as WifiManager

2：获取当前连接信息WifiInfo

if (wifi.isWifiEnabled) {
	// Wi-Fi模块开启，获取连接信息
	val info = wifi.connectionInfo
	// 
	if(SupplicantState.DISCONNECTED == wifi.connectionInfo.supplicantState) {
		// 可以判定未连接到热点，不授予位置权限也能成功判断
	}
}

备注：
在Android 10中，bssid，ssid将不可靠，具体可看WifiInfo源码介绍的注释，在没有权限的时候不管是否连接wifi，获取到的bssid是"02:00:00:00:00:00"，获取到的ssid是"< unknown ssid >"

    /**
     * Return the basic service set identifier (BSSID) of the current access point.
     * <p>
     * The BSSID may be
     * <lt>{@code null}, if there is no network currently connected.</lt>
     * <lt>{@code "02:00:00:00:00:00"}, if the caller has insufficient permissions to access the
     * BSSID.<lt>
     * </p>
     *
     * @return the BSSID, in the form of a six-byte MAC address: {@code XX:XX:XX:XX:XX:XX}
     */
    public String getBSSID() {
        return mBSSID;
    }

/**
     * Returns the service set identifier (SSID) of the current 802.11 network.
     * <p>
     * If the SSID can be decoded as UTF-8, it will be returned surrounded by double
     * quotation marks. Otherwise, it is returned as a string of hex digits.
     * The SSID may be
     * <lt>&lt;unknown ssid&gt;, if there is no network currently connected or if the caller has
     * insufficient permissions to access the SSID.<lt>
     * </p>
     * <p>
     * Prior to {@link android.os.Build.VERSION_CODES#JELLY_BEAN_MR1}, this method
     * always returned the SSID with no quotes around it.
     * </p>
     *
     * @return the SSID.
     */
    public String getSSID() {
        if (mWifiSsid != null) {
            String unicode = mWifiSsid.toString();
            if (!TextUtils.isEmpty(unicode)) {
                return "\"" + unicode + "\"";
            } else {
                String hex = mWifiSsid.getHexString();
                return (hex != null) ? hex : WifiSsid.NONE;
            }
        }
        return WifiSsid.NONE;
    }

本文地址：https://blog.csdn.net/xiaocheng0404/article/details/107375780