download：前端支流布局零碎进阶与实战

public class NetworkUtils {

public static boolean isNetworkAvailable(Context c) {Context context = c.getApplicationContext();
    // 获取手机所有连贯治理对象（包含对 wi-fi,net 等连贯的治理）ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);

    if (connectivityManager == null) {return false;} else {
        // 获取 NetworkInfo 对象
        NetworkInfo[] networkInfo = connectivityManager.getAllNetworkInfo();

        if (networkInfo != null && networkInfo.length > 0) {for (NetworkInfo aNetworkInfo : networkInfo) {

// System.out.println(i + “=== 状态 ===” + networkInfo[i].getState());
// System.out.println(i + “=== 类型 ===” + networkInfo[i].getTypeName());

                // 判断以后网络状态是否为连贯状态
                if (aNetworkInfo.getState() == NetworkInfo.State.CONNECTED) {return true;}
            }
        }
    }
    return false;
}

/**
 * 判断 WIFI 是否关上
 * @param context
 * @return
 */
public static boolean isWifiEnabled(Context context) {ConnectivityManager mgrConn = (ConnectivityManager) context
            .getSystemService(Context.CONNECTIVITY_SERVICE);
    TelephonyManager mgrTel = (TelephonyManager) context
            .getSystemService(Context.TELEPHONY_SERVICE);
    return ((mgrConn.getActiveNetworkInfo() != null && mgrConn
            .getActiveNetworkInfo().getState() == NetworkInfo.State.CONNECTED) || mgrTel
            .getNetworkType() == TelephonyManager.NETWORK_TYPE_UMTS);
}

/**
 * 判断是否是 3G 网络
 * @param context
 * @return
 */
public static boolean is3rd(Context context) {ConnectivityManager cm = (ConnectivityManager) context
            .getSystemService(Context.CONNECTIVITY_SERVICE);
    NetworkInfo networkINfo = cm.getActiveNetworkInfo();
    if (networkINfo != null
            && networkINfo.getType() == ConnectivityManager.TYPE_MOBILE) {return true;}
    return false;
}

/**
 * 判断是 wifi 还是 3g 网络
 * @param context
 * @return
 */
public static boolean isWifi(Context context) {ConnectivityManager cm = (ConnectivityManager) context
            .getSystemService(Context.CONNECTIVITY_SERVICE);
    NetworkInfo networkINfo = cm.getActiveNetworkInfo();
    if (networkINfo != null
            && networkINfo.getType() == ConnectivityManager.TYPE_WIFI) {return true;}
    return false;
}

}