android工具类（2）NetWorkHelper 网络工具类

import android.content.Context;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.net.Uri;
import android.net.NetworkInfo.State;
import android.telephony.TelephonyManager;
import android.util.Log;

public class NetWorkHelper {
    public static final int NETWORN_NONE = 0;
    public static final int NETWORN_WIFI = 1;
    public static final int NETWORN_MOBILE = 2;
	private static String LOG_TAG = "NetWorkHelper";

	public static Uri uri = Uri.parse("content://telephony/carriers");

	/**
	 * 推断是否有网络
	 */
	public static boolean isNetworkAvailable(Context context) {
		ConnectivityManager connectivity = (ConnectivityManager) context
				.getSystemService(Context.CONNECTIVITY_SERVICE);

		if (connectivity == null) {
			Log.w(LOG_TAG, "couldn't get connectivity manager");
		} else {
			NetworkInfo[] info = connectivity.getAllNetworkInfo();
			if (info != null) {
				for (int i = 0; i < info.length; i++) {
					if (info[i].isAvailable()) {
						Log.d(LOG_TAG, "network is available");
						return true;
					}
				}
			}
		}
		Log.d(LOG_TAG, "network is not available");
		return false;
	}
	/**
	 * 检查网络状态
	 * @param context
	 * @return
	 */
	public static boolean checkNetState(Context context){
    	boolean netstate = false;
		ConnectivityManager connectivity = (ConnectivityManager)context.getSystemService(Context.CONNECTIVITY_SERVICE);
		if(connectivity != null)
		{
			NetworkInfo[] info = connectivity.getAllNetworkInfo();
			if (info != null) {
				for (int i = 0; i < info.length; i++)
				{
					if (info[i].getState() == NetworkInfo.State.CONNECTED) 
					{
						netstate = true;
						break;
					}
				}
			}
		}
		return netstate;
    }

	/**
	 * 推断网络是否为漫游
	 */
	public static boolean isNetworkRoaming(Context context) {
		ConnectivityManager connectivity = (ConnectivityManager) context
				.getSystemService(Context.CONNECTIVITY_SERVICE);
		if (connectivity == null) {
			Log.w(LOG_TAG, "couldn't get connectivity manager");
		} else {
			NetworkInfo info = connectivity.getActiveNetworkInfo();
			if (info != null
					&& info.getType() == ConnectivityManager.TYPE_MOBILE) {
				TelephonyManager tm = (TelephonyManager) context
						.getSystemService(Context.TELEPHONY_SERVICE);
				if (tm != null && tm.isNetworkRoaming()) {
					Log.d(LOG_TAG, "network is roaming");
					return true;
				} else {
					Log.d(LOG_TAG, "network is not roaming");
				}
			} else {
				Log.d(LOG_TAG, "not using mobile network");
			}
		}
		return false;
	}

	/**
	 * 推断MOBILE网络是否可用
	 * 
	 * @param context
	 * @return
	 * @throws Exception
	 */
	public static boolean isMobileDataEnable(Context context) {
		ConnectivityManager connectivityManager = (ConnectivityManager) context
				.getSystemService(Context.CONNECTIVITY_SERVICE);
		boolean isMobileDataEnable = false;

		isMobileDataEnable = connectivityManager.getNetworkInfo(
				ConnectivityManager.TYPE_MOBILE).isConnectedOrConnecting();

		return isMobileDataEnable;
	}

	
	/**
	 * 推断wifi 是否可用
	 * @param context
	 * @return
	 * @throws Exception
	 */
	public static boolean isWifiDataEnable(Context context) {
		ConnectivityManager connectivityManager = (ConnectivityManager) context
				.getSystemService(Context.CONNECTIVITY_SERVICE);
		boolean isWifiDataEnable = false;
		isWifiDataEnable = connectivityManager.getNetworkInfo(
				ConnectivityManager.TYPE_WIFI).isConnectedOrConnecting();
		return isWifiDataEnable;
	}

	
    public static int getNetworkState(Context context){
        ConnectivityManager connManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);

        //Wifi
        State state = connManager.getNetworkInfo(ConnectivityManager.TYPE_WIFI).getState();
        if(state == State.CONNECTED||state == State.CONNECTING){
            return NETWORN_WIFI;
        }

        //3G
        state = connManager.getNetworkInfo(ConnectivityManager.TYPE_MOBILE).getState();
        if(state == State.CONNECTED||state == State.CONNECTING){
            return NETWORN_MOBILE;
        }
        return NETWORN_NONE;
    }
	
}