Preface

When our App makes network requests, it often encounters network disconnection, reconnection, data flow and WIFI changes. So how do we judge the current situation? Next, we will introduce the commonly used network state judgment methods.

• Determine if there is a network connection
• Judge whether WIFI network is available
• Determine whether data flow is available
• Get the type information of the current network connection
• Get current network status

judge

1. Judge whether there is network connection

public static boolean isNetworkConnected(Context context) {
        if (context != null) {
            ConnectivityManager mConnectivityManager = (ConnectivityManager) context
                    .getSystemService(Context.CONNECTIVITY_SERVICE);
            NetworkInfo mNetworkInfo = mConnectivityManager.getActiveNetworkInfo();
            if (mNetworkInfo != null) {
                return mNetworkInfo.isAvailable();
            }
        }
        return false;
    }

Returns true when there is a net, and false when there is no net

Judge whether WIFI network is available

public static boolean isWifiConnected(Context context) {
        if (context != null) {
            ConnectivityManager mConnectivityManager = (ConnectivityManager) context
                    .getSystemService(Context.CONNECTIVITY_SERVICE);
            NetworkInfo mWiFiNetworkInfo = mConnectivityManager
                    .getNetworkInfo(ConnectivityManager.TYPE_WIFI);
            if (mWiFiNetworkInfo != null) {
                return mWiFiNetworkInfo.isAvailable();
            }
        }
        return false;
    }

WIFI network returns true, not WIFI returns false

Determine whether data flow is available

public static boolean isMobileConnected(Context context) {
        if (context != null) {
            ConnectivityManager mConnectivityManager = (ConnectivityManager) context
                    .getSystemService(Context.CONNECTIVITY_SERVICE);
            NetworkInfo mMobileNetworkInfo = mConnectivityManager
                    .getNetworkInfo(ConnectivityManager.TYPE_MOBILE);
            if (mMobileNetworkInfo != null) {
                return mMobileNetworkInfo.isAvailable();
            }
        }
        return false;
    }

Return true, not false when it is data flow

Get the type information of the current network connection

public static int getConnectedType(Context context) {
        if (context != null) {
            ConnectivityManager mConnectivityManager = (ConnectivityManager) context
                    .getSystemService(Context.CONNECTIVITY_SERVICE);
            NetworkInfo mNetworkInfo = mConnectivityManager.getActiveNetworkInfo();
            if (mNetworkInfo != null && mNetworkInfo.isAvailable()) {
                return mNetworkInfo.getType();
            }
        }
        return -1;
    }

Get current network status

No network 0: WIFI network 1: 3G network 2: 2G network 3

public static int getAPNType(Context context) {
        int netType = 0;
        ConnectivityManager connMgr = (ConnectivityManager) context
                .getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfo networkInfo = connMgr.getActiveNetworkInfo();
        if (networkInfo == null) {
            return netType;
        }
        int nType = networkInfo.getType();
        if (nType == ConnectivityManager.TYPE_WIFI) {
            netType = 1;// wifi
        } else if (nType == ConnectivityManager.TYPE_MOBILE) {
            int nSubType = networkInfo.getSubtype();
            TelephonyManager mTelephony = (TelephonyManager) context
                    .getSystemService(Context.TELEPHONY_SERVICE);
            if (nSubType == TelephonyManager.NETWORK_TYPE_UMTS
                    && !mTelephony.isNetworkRoaming()) {
                netType = 2;// 3G
            } else {
                netType = 3;// 2G
            }
        }
        return netType;
    }