SystemService 学习笔记之ConnectivityManager

ConnectivityManager功能：监视网络连接状态

通过context.getSystemService(Context.CONNECTIVITY_SERVICE);方法获取，

需要添加权限 :android.permission.ACCESS_NETWORK_STATE

常用方法：

1.getAllNetworkInfo（） //获取所有网络连接信息

2.getActiveNetworkInfo（）// 获取正连接的网络的信息

3.getNetworkInfo（int networkType）//获取指定的网络连接类型的信息

    networkType的类型有：ConnectivityManage.TYPE_WIFI;ConnectivityManage.TYPE_MOBILE 等

getAllNetworkInfo()实例：

	public static boolean isNetworkAvailable(Activity mActivity){
		Context context = mActivity.getApplicationContext();
		
		ConnectivityManager connectivity = (ConnectivityManager)context.getSystemService(
				Context.CONNECTIVITY_SERVICE);
		
		if(connectivity == null){
			return false;
		}else {
			NetworkInfo[] info = connectivity.getAllNetworkInfo();
			if(info != null ){
				for(int i=0; i

getActiveNetworkInfo（）实例：

	  public static boolean isNetworkAvailable(Activity mActivity){
		  Context context = mActivity.getApplicationContext();

		  ConnectivityManager connectivity = (ConnectivityManager)context.getSystemService(
		  Context.CONNECTIVITY_SERVICE);
		  NetworkInfo networkInfo = connectivity.getActiveNetworkInfo();  
		   // 获取当前的网络连接是否可用  
		    //网络类型的判断networkInfo.getType()==ConnectivityManager.TYPE_MOBILE
		  	if(networkInfo.isAvailable())
		  		return true;
		  	else
		  		return false;

 getNetworkInfo（int networkType）实例：

	public static boolean isNetworkAvailable(Activity mActivity){
	Context context = mActivity.getApplicationContext();
		  			
	ConnectivityManager connectivity = (ConnectivityManager)context.getSystemService(
		  	Context.CONNECTIVITY_SERVICE);
	if(State.CONNECTED==connectivity.getNetworkInfo(ConnectivityManager.TYPE_MOBILE).getState())
		  	return true;
	if(State.CONNECTED==connectivity.getNetworkInfo(ConnectivityManager.TYPE_WIFI).getState())
		  return true;
	else	  			  
	    return false;
		  			
		  		}

  State的六种状态：
 public static final NetworkInfo.State CONNECTED

 public static final NetworkInfo.State CONNECTING

 public static final NetworkInfo.State DISCONNECTED

 public static final NetworkInfo.State DISCONNECTING

 public static final NetworkInfo.State SUSPENDED

 public static final NetworkInfo.State UNKNOWN