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[Request]: network_info_plus: use ConnectivityManager for getWifiIP and getWifiGatewayIP from Android 7 (N), so ethernet works below Android 12

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2026年10月6日 から。

  • #3999 @redge-munch による — オープン

評価

難易度
3/5
見積もり時間
半日
初心者へのやさしさ
22/100
issue の種類
バグ
明瞭さ
明確に書かれている
活発さ
停滞
技術スタック
android, dart, flutter, kotlin
領域
mobile, mobile-dev

調査の方向性

Work is already in open PR #3999; do not start a duplicate. The Android path lives in the network_info_plus plugin: NetworkInfoPlusPlugin.setupChannels() currently constructs ConnectivityManager only from VERSION_CODES.S, and NetworkInfo.getWifiIPAddress() / getGatewayIPAddress() use the same S gate (WifiInfo/dhcpInfo below that). Confirm minSdk 19 still needs the Wi-Fi fallback below N. Done means ethernet IP/gateway work on API 24–30 without crashing getDhcpServerAddress on API 24–29.

索引モデルが issue の本文から書いたものです。

説明

enhancement triage
Plugin

network_info_plus

Use case

If an Android device below version 12 is on ethernet, the plugin can't find the network:

  • getWifiIP() gives back null
  • getWifiSubmask() gives back an empty string
  • getWifiBroadcast() and getWifiIPv6() don't work either
  • getWifiGatewayIP() doesn't give the ethernet gateway

On Android 12 and up it works fine. The Android code uses ConnectivityManager there, and that works for any kind of connection. But it only turns on at Build.VERSION_CODES.S. Below that, the plugin uses WifiInfo and dhcpInfo instead. Those only know about Wi-Fi, so on ethernet they just give back 0.

The thing is, the ConnectivityManager calls are much older than Android 12. getActiveNetwork() is API 23, and the rest are API 21. The only newer one is getDhcpServerAddress(), which the gateway code uses. That one is API 30.

The S check came in with #1151. #420 asks for something similar, but this is just for Android.

Proposal

Turn on the ConnectivityManager code from Android 7 (Build.VERSION_CODES.N, API 24) instead of Android 12. That takes 3 small changes.

1. Get ConnectivityManager from N in NetworkInfoPlusPlugin.setupChannels()

Right now it's only set up on S and above, so it's null on older devices. If you only change the check in NetworkInfo.kt, nothing happens.

var connectivityManager: ConnectivityManager? = null
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
    connectivityManager = context.applicationContext.getSystemService(Context.CONNECTIVITY_SERVICE) as ConnectivityManager
}

2. Change the check in NetworkInfo.getWifiIPAddress()

Only the version number changes. The rest stays the same.

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
    val linkAddresses =
        connectivityManager?.getLinkProperties(connectivityManager.activeNetwork)?.linkAddresses
    // ...unchanged
}

3. Get the gateway from the default route in NetworkInfo.getGatewayIPAddress()

You can't just change the version number here. getDhcpServerAddress() needs API 30, so it would crash on API 24 to 29. The default route works from API 21. It's also a bit better on Android 12+, because it gives you the real gateway and not the DHCP server. Those aren't always the same thing.

return if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
    val linkProperties =
        connectivityManager?.getLinkProperties(connectivityManager.activeNetwork)
    val defaultRoute = linkProperties?.routes?.firstOrNull { route -> route.isDefaultRoute }

    defaultRoute?.gateway?.hostAddress
} else {
    // ...existing dhcpInfo fallback, unchanged
}

Subnet mask, broadcast and IPv6 don't need any changes. They all use the IP from getWifiIPAddress(), so they start working once that does.

The plugin's minSdk is 19, so the old Wi-Fi code still runs on anything below N.

I tried this on ethernet on API 25, 28 and 30, and it works on all of them. Before the change, none of them showed anything. It might work on API 23 (M) too, but I haven't tried that.

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