处理 Android 中的互联网连接变化

问题集中在需要一个可以监视互联网连接变化的广播接收器，因为现有代码仅检测连接变化。

为了解决这个问题，这里有一个替代方法：

public class NetworkUtil {
    public static final int TYPE_WIFI = 1;
    public static final int TYPE_MOBILE = 2;
    public static final int TYPE_NOT_CONNECTED = 0;

    public static int getConnectivityStatus(Context context) {
        ConnectivityManager cm = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);

        NetworkInfo activeNetwork = cm.getActiveNetworkInfo();
        if (activeNetwork != null) {
            if (activeNetwork.getType() == ConnectivityManager.TYPE_WIFI)
                return TYPE_WIFI;

            if (activeNetwork.getType() == ConnectivityManager.TYPE_MOBILE)
                return TYPE_MOBILE;
        }
        return TYPE_NOT_CONNECTED;
    }
}

此方法确定设备是否连接到 WiFi 或移动数据。

public class NetworkChangeReceiver extends BroadcastReceiver {

    @Override
    public void onReceive(final Context context, final Intent intent) {
        int status = NetworkUtil.getConnectivityStatus(context);
        if ("android.net.conn.CONNECTIVITY_CHANGE".equals(intent.getAction()) {
            if (status == NetworkUtil.TYPE_NOT_CONNECTED) {
                // Handle loss of internet connectivity
            } else {
                // Handle restoration of internet connectivity
            }
        }
    }
}

此 BroadcastReceiver 监视连接状态变化并根据当前状态触发操作。请记住在 AndroidManifest.xml 中包含适当的权限并注册接收器：