if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED) { // TODO: Consider calling // ActivityCompat#requestPermissions // here to request the missing permissions, and then overriding // public void onRequestPermissionsResult(int requestCode, String[] permissions, // int[] grantResults) // to handle the case where the user grants the permission. See the documentation // for ActivityCompat#requestPermissions for more details. return; } String macAddress = wifiManager.getConnectionInfo().getMacAddress(); 怎么写

你可以在需要获取 MAC 地址的地方添加以下代码：

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

WifiManager wifiManager = (WifiManager) getApplicationContext().getSystemService(Context.WIFI_SERVICE);
String macAddress = wifiManager.getConnectionInfo().getMacAddress();

其中，PERMISSIONS_REQUEST_CODE 是自定义的请求码，用于处理权限请求结果。如果权限没有被授权，会弹出一个权限请求对话框，用户可以选择授权或拒绝。在用户做出选择后，会回调 onRequestPermissionsResult() 方法，你可以在该方法中处理权限请求结果。

@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
    super.onRequestPermissionsResult(requestCode, permissions, grantResults);

    if (requestCode == PERMISSIONS_REQUEST_CODE) {
        if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
            // 权限已授权，可以获取 MAC 地址
            WifiManager wifiManager = (WifiManager) getApplicationContext().getSystemService(Context.WIFI_SERVICE);
            String macAddress = wifiManager.getConnectionInfo().getMacAddress();
            Toast.makeText(this, "MAC Address: " + macAddress, Toast.LENGTH_SHORT).show();
        } else {
            // 权限被拒绝，无法获取 MAC 地址
            Toast.makeText(this, "Permission denied", Toast.LENGTH_SHORT).show();
        }
    }
}