Android 工具类 判定有无网络 NetworkUtils

public class NetworkUtils {
/**
* 判断当前网络是否可用
*
* @param context 当前Acitivity对象
* @return 可用返回true 否则返回false
*/
public static boolean isNetworkAvailable(Context context) {
ConnectivityManager manager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo info = manager.getActiveNetworkInfo();
return (info != null && info.isConnected());
}

/**
* 判断当前是否是wifi
* @param context
* @return
*/

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;
}

public static String int2ip(long paramLong) {
StringBuilder localStringBuilder = new StringBuilder();
localStringBuilder.append(paramLong & 0xFF).append(".");
localStringBuilder.append(0xFF & paramLong >> 8).append(".");
localStringBuilder.append(0xFF & paramLong >> 16).append(".");
localStringBuilder.append(0xFF & paramLong >> 24);
return localStringBuilder.toString();
}

/**
* 得到wifi的ip地址
* @param context
* @return
*/
public static String getIpAddress(Context context) {
if (isWifiConnected(context)) {
WifiManager wifiManager = (WifiManager) context.getSystemService(Context.WIFI_SERVICE);
if (!wifiManager.isWifiEnabled()) {
wifiManager.setWifiEnabled(true);
WifiInfo wifiInfo = wifiManager.getConnectionInfo();
int ip = wifiInfo.getIpAddress();
return int2ip(ip);
}
}
try {
for (Enumeration<NetworkInterface> en = NetworkInterface.getNetworkInterfaces();
en.hasMoreElements(); ) {
NetworkInterface inf = en.nextElement();
for (Enumeration<InetAddress> enumeration = inf.getInetAddresses(); enumeration.hasMoreElements(); ) {
InetAddress address = enumeration.nextElement();
if (!address.isLoopbackAddress()) {
return address.getHostAddress().toString();
}
}
}
} catch (Exception e) {
e.printStackTrace();
}
return null;
}

/**
* 得到网络类型
* @param context
* @return one of {@link ConnectivityManager#TYPE_MOBILE}, {@link
* ConnectivityManager#TYPE_WIFI}, {@link ConnectivityManager#TYPE_WIMAX}, {@link
* ConnectivityManager#TYPE_ETHERNET},  {@link ConnectivityManager#TYPE_BLUETOOTH}, or other
* types defined by {@link ConnectivityManager}
*/
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;
}

}