Android之ConnectivityManager

ConnectivityManager：andriod中处理网路连接的类：

Api解释：

Class that answers queries about the state of network connectivity. It also notifies applications when networkconnectivity changes.

Get an instance of this class by calling Context.getSystemService(Context.CONNECTIVITY_SERVICE).

Theprimary responsibilities of this class are to:

Monitor network connections (Wi-Fi, GPRS, UMTS, etc.)

Send broadcast intents when network connectivity changes

Attempt to "fail over" to another network when connectivity to a network is lost

Provide an API that allows applications to query the coarse-grained or fine-grained state of the available networks

说的就是这个类，是关于网络状态连接的类，当手机网络连接改变时,会通知application.

通过Context.getSystemService(Context.CONNECTTIVITY_SERVICE)获取相应实例。

用法：

1.判断是否有网路连接：

public boolean isNetWorkConnected(Context context){if(context!=null){ConnectivityManager mConnectivityManager = (ConnectivityManager)context.getSystemService(Context.CONNECTIVITY_SERVICE);NetworkInfo mNetworkInfo = mConnectivityManager.getActivieNetworkInfo();if(mNetworkInfo != null){return mNetworkInfo.isAvailable();}}return false;}

2.判断WIFI网络是否可用

public boolean isWifiConnected(Context context) {      if (context != null) {          ConnectivityManager mConnectivityManager = (ConnectivityManager) context                  .getSystemService(Context.CONNECTIVITY_SERVICE);          NetworkInfo mWiFiNetworkInfo = mConnectivityManager                  .getNetworkInfo(ConnectivityManager.TYPE_WIFI);          if (mWiFiNetworkInfo != null) {              return mWiFiNetworkInfo.isAvailable();          }      }      return false;  }

3）判断MOBILE网络是否可用

public boolean isMobileConnected(Context context) {      if (context != null) {          ConnectivityManager mConnectivityManager = (ConnectivityManager) context                  .getSystemService(Context.CONNECTIVITY_SERVICE);          NetworkInfo mMobileNetworkInfo = mConnectivityManager                  .getNetworkInfo(ConnectivityManager.TYPE_MOBILE);          if (mMobileNetworkInfo != null) {              return mMobileNetworkInfo.isAvailable();          }      }      return false;  }

4）获取当前网络连接的类型信息

public static int getConnectedType(Context context) {      if (context != null) {          ConnectivityManager mConnectivityManager = (ConnectivityManager) context                  .getSystemService(Context.CONNECTIVITY_SERVICE);          NetworkInfo mNetworkInfo = mConnectivityManager.getActiveNetworkInfo();          if (mNetworkInfo != null && mNetworkInfo.isAvailable()) {              return mNetworkInfo.getType();          }      }      return -1;  }

方法总结：1.通过上下文获取ConnectivtyManager对象

2.通过ConnectivtyManager获取NetworkInfo对象

如果判断是否有网络连接通过ConnectivtyManager中的getActiveNetworkInfo()方法

有哪种连接在getNetworkInfo中传入相应的字段(具体去查API);

3.判断网络是否可用。

4 .AndroidManifest添加权限

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