NetUtil.java

package cn.coderss.util;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.net.HttpURLConnection;
import java.net.URL;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.util.EntityUtils;

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

public class NetUtil {
	public static final int NETWORN_NONE = 0;
	public static final int NETWORN_WIFI = 1;
	public static final int NETWORN_MOBILE = 2;

	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;
	}
	
	
	// 检测网络连接
	public static boolean checkConnection(Context context) {
		ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService(context.CONNECTIVITY_SERVICE);
		NetworkInfo networkInfo = connectivityManager.getActiveNetworkInfo();
		if (networkInfo != null) {
			return networkInfo.isAvailable();
		}
		return false;
	}

	public static boolean isWifi(Context mContext) {
		ConnectivityManager connectivityManager = (ConnectivityManager) mContext.getSystemService(Context.CONNECTIVITY_SERVICE);
		NetworkInfo activeNetInfo = connectivityManager.getActiveNetworkInfo();
		if (activeNetInfo != null && activeNetInfo.getTypeName().equals("WIFI")) {
			return true;
		}
		return false;
	}

	/**
	 * 从网上获取内容get方式
	 * 
	 * @param url
	 * @return
	 * @throws IOException
	 * @throws ClientProtocolException
	 */
	public static String getStringFromUrl(String url) throws ClientProtocolException, IOException {
		HttpGet get = new HttpGet(url);
		HttpClient client = new DefaultHttpClient();
		HttpResponse response = client.execute(get);
		HttpEntity entity = response.getEntity();
		return EntityUtils.toString(entity, "UTF-8");
	}
	
	
}