检查网络是否连接（wifi或移动数据）android java

Question

我目前正在检测WIFI是否使用以下代码连接：

        BroadcastReceiver wifiStateReceiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            int wifiStateExtra = intent.getIntExtra(WifiManager.EXTRA_WIFI_STATE,
                    WifiManager.WIFI_STATE_UNKNOWN);
            Log.v("Log","Wifi Toggled");

        }
    };

    IntentFilter intentFilter = new IntentFilter(WifiManager.WIFI_STATE_CHANGED_ACTION);
    context.registerReceiver(wifiStateReceiver, intentFilter);

    wifiManager = (WifiManager) context.getSystemService(Context.WIFI_SERVICE);

每当打开或关闭 wifi 时，此代码当前都会告诉我。 我正在寻找这样的东西，它会在我的网络状态发生变化时向我发送通知，即当我连接或没有连接（wifi 或移动数据）到互联网时。 有没有像我可以使用的 NetworkManger 之类的东西来告诉我网络状态是否发生了变化？

Answer 1

Android Internet 连接检查 API 29+

private static final String DEBUG_TAG = "NetworkStatusExample";

ConnectivityManager connMgr =
        (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
boolean isWifiConn = false;
boolean isMobileConn = false;
for (Network network : connMgr.getAllNetworks()) {
    NetworkInfo networkInfo = connMgr.getNetworkInfo(network);
    if (networkInfo.getType() == ConnectivityManager.TYPE_WIFI) {
        isWifiConn |= networkInfo.isConnected();
    }
    if (networkInfo.getType() == ConnectivityManager.TYPE_MOBILE) {
        isMobileConn |= networkInfo.isConnected();
    }
}
Log.d(DEBUG_TAG, "Wifi connected: " + isWifiConn);
Log.d(DEBUG_TAG, "Mobile connected: " + isMobileConn);

Answer 2

查看确定和监控连接状态的官方文档。

确定您是否有互联网连接

ConnectivityManager cm =
 (ConnectivityManager)context.getSystemService(Context.CONNECTIVITY_SERVICE);

NetworkInfo activeNetwork = cm.getActiveNetworkInfo();
boolean isConnected = activeNetwork != null &&
                      activeNetwork.isConnectedOrConnecting();

确定您的互联网连接类型

（设备连接可以通过移动数据、WiMAX、Wi-Fi 和以太网连接提供）

boolean isWiFi = activeNetwork.getType() == ConnectivityManager.TYPE_WIFI;

监控连接的变化

面向 Android 7.0（API 级别 24）及更高版本的应用如果在其清单中声明了广播接收器，则不会收到 CONNECTIVITY_ACTION 广播。 如果应用程序使用 Context.registerReceiver() 注册它们的 BroadcastReceiver 并且该上下文仍然有效，它们仍将接收 CONNECTIVITY_ACTION 广播。

Answer 3

    val connMgr = getSystemService(CONNECTIVITY_SERVICE) as ConnectivityManager

    var isWifiConn = false
    var isMobileConn = false
    for (network in connMgr.allNetworks) {
        val networkInfo = connMgr.getNetworkInfo(network)
        if (networkInfo!!.type == ConnectivityManager.TYPE_WIFI) {
            isWifiConn = isWifiConn or networkInfo!!.isConnected
        }
        if (networkInfo!!.type == ConnectivityManager.TYPE_MOBILE) {
            isMobileConn = isMobileConn or networkInfo!!.isConnected
        }
    }
    Log.d("DEBUG_TAG", "Wifi connected: $isWifiConn")
    Log.d("DEBUG_TAG", "Mobile connected: $isMobileConn")