NetUtils.java

package com.ttj.utils;

import android.annotation.SuppressLint;
import android.content.Context;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;

/**
 * Network tools
 * 
 * @author linshao
 *
 */
public class NetUtils {
	/**
	 * 获取 NetWorkInfo
	 * 
	 * @param context
	 * 
	 * @return
	 */
	private static NetworkInfo getNetWorkInfo(Context context) {
		ConnectivityManager mConnectivityManager = (ConnectivityManager) context
				.getSystemService(Context.CONNECTIVITY_SERVICE);
		NetworkInfo mNetworkInfo = mConnectivityManager.getActiveNetworkInfo();
		return mNetworkInfo;
	}

	/**
	 * To determine whether the network is available
	 * 
	 * @param context
	 * @return
	 */
	public boolean isNetworkConnected(Context context) {
		if (context != null) {
			NetworkInfo mNetworkInfo = getNetWorkInfo(context);
			if (mNetworkInfo != null) {
				return mNetworkInfo.isAvailable();
			}
		}
		return false;
	}

	/**
	 * 获取当前网络类型
	 * 
	 * @return 0：没有网络 1：WIFI网络 2：WAP网络 3：NET网络
	 */
	@SuppressLint("DefaultLocale")
	public static int getNetworkType(Context mContext) {
		int netType = 0;
		NetworkInfo networkInfo = getNetWorkInfo(mContext);
		if (networkInfo == null) {
			return netType;
		}
		int nType = networkInfo.getType();
		if (nType == ConnectivityManager.TYPE_MOBILE) {
			String extraInfo = networkInfo.getExtraInfo();
			if (!isEmpty(extraInfo)) {
				if (extraInfo.toLowerCase().equals("cmnet")) {
					netType = 3;
				} else {
					netType = 2;
				}
			}
		} else if (nType == ConnectivityManager.TYPE_WIFI) {
			netType = 1;
		}
		return netType;
	}
	/**
	 * 判断给定字符串是否空白串。 空白串是指由空格、制表符、回车符、换行符组成的字符串 若输入字符串为null或空字符串，返回true
	 * 
	 * @param input
	 * @return boolean
	 */
	public static boolean isEmpty(String input) {
		if (input == null || "".equals(input))
			return true;

		for (int i = 0; i < input.length(); i++) {
			char c = input.charAt(i);
			if (c != ' ' && c != '\t' && c != '\r' && c != '\n') {
				return false;
			}
		}
		return true;
	}
}