Android获取WiFi MAC地址：代码示例及常见错误解决

以下代码演示如何在Android应用中获取WiFi MAC地址：

WifiManager wifiManager = (WifiManager) getApplicationContext().getSystemService(Context.WIFI_SERVICE);
List<ScanResult> scanResults = wifiManager.getScanResults();
for (ScanResult scanResult : scanResults) {
    if (scanResult.SSID.equals('YOUR_WIFI_NAME')) {
        String macAddress = scanResult.BSSID;
        // 处理macAddress
        break;
    }
}

如果您的代码出现错误，很可能是因为缺少必要的权限。您需要在AndroidManifest.xml文件中添加以下权限：

<uses-permission android:name='android.permission.ACCESS_WIFI_STATE' />
<uses-permission android:name='android.permission.ACCESS_COARSE_LOCATION' />
<uses-permission android:name='android.permission.ACCESS_FINE_LOCATION' />
<uses-permission android:name='android.permission.CHANGE_WIFI_STATE' />

此外，您还需要在运行时动态请求权限，以下代码示例：

if (ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
    ActivityCompat.requestPermissions(this, new String[] { Manifest.permission.ACCESS_COARSE_LOCATION }, PERMISSIONS_REQUEST_CODE);
}