Android 中判断网络状态

首先在AndroidManifest.xml添加权限

<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />

1,判断是否有网络连接

public 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;
}

2.判断WIFI网络是否可用

public 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;
}

3.判断MOBILE网络是否可用

public 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;
}

4.判断网络类型

       //返回值 -1：没有网络  1：WIFI网络2：wap网络3：net网络
public static int GetNetype(Context context)
{
    int netType = -1;
    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_MOBILE)
    {
        if(networkInfo.getExtraInfo().toLowerCase().equals("cmnet"))
        {
            netType = 3;
        }
        else
        {
            netType = 2;
        }
    }
    else if(nType==ConnectivityManager.TYPE_WIFI)
    {
        netType = 1;
    }
    return netType;
}