NetworkReceiver.java

package com.csq.thesceneryalong.receiver;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.telephony.TelephonyManager;

import android.util.Log;
import com.csq.thesceneryalong.app.App;
import com.csq.thesceneryalong.utils.DebugLog;

public class NetworkReceiver extends BroadcastReceiver {
	
	private volatile static boolean isConnected = true;
	private volatile static NetType curNetType = NetType.unknown;

	@Override
	public void onReceive(Context context, Intent intent) {
		// TODO Auto-generated method stub
		checkConnect();
	}
	
	public void regist(Context context){
		IntentFilter f = new IntentFilter("android.net.conn.CONNECTIVITY_CHANGE");
		context.registerReceiver(this, f);
		
		checkConnect();
	}
	
	public void unRegist(Context context){
		context.unregisterReceiver(this);
	}
	
	/**
	 * 网络是否连接
	 */
	public static boolean isConnected() {
		return isConnected;
	}
	
	/**
	 * 获得当前网络类型
	 * @return
	 */
	public static NetType getCurNetType() {
		return curNetType;
	}
	
	
	
	private void checkConnect(){
		boolean curConnected = isNetConnected();
		NetType thisNetType = getNetType();
		
		/*if(!isConnected && curConnected){
			//网络由未连接到重新连接
		}
		
		if(curNetType == NetType.wifi && thisNetType != NetType.wifi){
			//以前是wifi，现在变为其他状态
		}*/
		
		NetworkReceiver.isConnected = curConnected;
		NetworkReceiver.curNetType = thisNetType;

        Log.d("", "NetworkConnectionChangeReceiver isConnected = "+isConnected
                +"   curNetType = "+curNetType);
	}
	
	/**
	 * 检测网络是否连接
	 */
	private static boolean isNetConnected() {
		ConnectivityManager conManager = (ConnectivityManager) App.app
				.getSystemService(Context.CONNECTIVITY_SERVICE);
		NetworkInfo networkInfo = conManager.getActiveNetworkInfo();
		if (networkInfo != null)
			return networkInfo.isAvailable();
		return false;
	}

	/**
	 * 获取网络类型
	 * @return unknown 0, gprs 1, 3g 2, wifi 3
	 */
	private static NetType getNetType() {
		ConnectivityManager connectivityManager = (ConnectivityManager) App.app
				.getSystemService(Context.CONNECTIVITY_SERVICE);
		NetworkInfo activeNetInfo = connectivityManager.getActiveNetworkInfo();
		if (activeNetInfo != null) {
			int type = activeNetInfo.getType();
			if (type == ConnectivityManager.TYPE_WIFI)
				return NetType.wifi;
			else if (type == ConnectivityManager.TYPE_MOBILE) {
				type = activeNetInfo.getSubtype();
				if (type >= TelephonyManager.NETWORK_TYPE_EVDO_0)
                    //>=5(TelephonyManager.NETWORK_TYPE_EVDO_0)表示3G网络
					return NetType.threeG;
				else
					return NetType.gprs;
			}
		}
		return NetType.unknown;
	}
	
	public static enum NetType {
		unknown,
		gprs,
		threeG,
		wifi
	}

}