NetworkUtil.java

package com.suan.weclient.util;

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

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

public class NetworkUtil {

	public static final int NOCONNECTION = 0;
	public static final int WIFI = 1;
	public static final int MOBILE = 2;

	public static int getNetworkType(Context context) {
		ConnectivityManager connMgr = (ConnectivityManager) context
				.getSystemService(Context.CONNECTIVITY_SERVICE);
		NetworkInfo networkInfo = connMgr.getActiveNetworkInfo();
		int networkType = NOCONNECTION;
		if (networkInfo != null) {
			int type = networkInfo.getType();
			networkType = type == ConnectivityManager.TYPE_WIFI ? WIFI : MOBILE;
		}
		return networkType;
	}

	public static String Md5(String plainText) {
		try {
			MessageDigest md = MessageDigest.getInstance("MD5");
			md.update(plainText.getBytes());
			byte b[] = md.digest();
			int i;
			StringBuffer buf = new StringBuffer("");
			for (int offset = 0; offset < b.length; offset++) {
				i = b[offset];
				if (i < 0)
					i += 256;
				if (i < 16)
					buf.append("0");
				buf.append(Integer.toHexString(i));
			}
			return buf.toString().substring(8, 24);
//			System.out.println("result: " + buf.toString());// 32位的加密
//			System.out.println("result: " + buf.toString().substring(8, 24));// 16位的加密
		} catch (NoSuchAlgorithmException e) {
			e.printStackTrace();
		}
		
		return null;
	}
}