如何以编程方式连接到已在Android手机中设置的VPN

import os
import sys
import subprocess

def connect_to_vpn(vpn_server_url, vpn_username, vpn_password):
    vpn_cmd = f"adb shell am start -a com.android.vending.billing.InAppBillingService/com.google.android.finsky.activities.WelcomeActivity --es com.android.vending.billing.extra.ITEM_ID {vpn_server_url}"
    vpn_cmd_with_auth = f"adb shell am start -a com.android.vending.billing.InAppBillingService/com.google.android.finsky.activities.WelcomeActivity --es com.android.vending.billing.extra.ITEM_ID {vpn_server_url} --es vpn_auth_token {vpn_password}"
    vpn_cmd_with_pin = f"adb shell am start -a com.android.vending.billing.InAppBillingService/com.google.android.finsky.activities.WelcomeActivity --es com.android.vending.billing.extra.ITEM_ID {vpn_server_url} --es vpn_server_pin {vpn_username}"

    try:
        os.system(vpn_cmd)
        os.system(vpn_cmd_with_auth)
        os.system(vpn_cmd_with_pin)
    except Exception as e:
        print(f"Error connecting to VPN: {e}")
        sys.exit(1)

if __name__ == "__main__":
    vpn_server_url = "your_vpn_server_url"
    vpn_username = "your_vpn_username"
    vpn_password = "your_vpn_password"
    
    connect_to_vpn(vpn_server_url, vpn_username, vpn_password)