Android(安卓)网络连接是否可用的

在 Wifi 列表页看到了当前网络状态 Connected, no Internet,就跟进去看看系统是如何判断网络的可用性的。

http://androidxref.com/8.0.0_r4/xref/frameworks/base/packages/SettingsLib/res/values/strings.xml

<string name="wifi_connected_no_internet">Connected, no Internetstring>

Wifi 列表会刷新可连接的ap列表

http://androidxref.com/8.0.0_r4/xref/frameworks/base/packages/SettingsLib/src/com/android/settingslib/wifi/AccessPoint.java#1088

if (state == DetailedState.CONNECTED) {    IWifiManager wifiManager = IWifiManager.Stub.asInterface(            ServiceManager.getService(Context.WIFI_SERVICE));    NetworkCapabilities nc = null;    try {        nc = cm.getNetworkCapabilities(wifiManager.getCurrentNetwork());    } catch (RemoteException e) {}    if (nc != null) {        if (nc.hasCapability(nc.NET_CAPABILITY_CAPTIVE_PORTAL)) {            return context.getString(                com.android.internal.R.string.network_available_sign_in);        } else if (!nc.hasCapability(NetworkCapabilities.NET_CAPABILITY_VALIDATED)) {            return context.getString(R.string.wifi_connected_no_internet);        }    }}

网络可用相当于

cm.activeNetworkInfo.isConnected && nc.hasCapability(NetworkCapabilities.NET_CAPABILITY_VALIDATED)

但测试了下 NetworkCapabilities 在部分机型是并不是很准，甚至完全不准- -

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