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Android中判断网络连接是否可用及监控网络状态

程序员文章站 2022-05-25 08:03:08
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Android中判断网络连接是否可用及监控网络状态

获取网络信息需要在AndroidManifest.xml文件中加入相应的权限。
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />

1)判断是否有网络连接
public boolean isNetworkConnected(Context context) { 
if (context != null) { 
ConnectivityManager mConnectivityManager = (ConnectivityManager) context 
.getSystemService(Context.CONNECTIVITY_SERVICE); 
NetworkInfo mNetworkInfo = mConnectivityManager.getActiveNetworkInfo(); 
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; 
}

有时候我们连接上一个没有外网连接的WiFi或者有线就会出现这种极端的情况,目前Android SDK还不能识别这种情况,一般的解决办法就是ping一个外网。
/* @author suncat
 * @category 判断是否有外网连接(普通方法不能判断外网的网络是否连接,比如连接上局域网)
 * @return
 */ 
public static final boolean ping() { 

  String result = null; 
  try { 
      String ip = "www.baidu.com";// ping 的地址,可以换成任何一种可靠的外网 
      Process p = Runtime.getRuntime().exec("ping -c 3 -w 100 " + ip);// ping网址3次 
      // 读取ping的内容,可以不加 
      InputStream input = p.getInputStream(); 
      BufferedReader in = new BufferedReader(new InputStreamReader(input)); 
      StringBuffer stringBuffer = new StringBuffer(); 
      String content = ""; 
      while ((content = in.readLine()) != null) { 
          stringBuffer.append(content); 
      } 
      Log.d("------ping-----", "result content : " + stringBuffer.toString()); 
      // ping的状态 
      int status = p.waitFor(); 
      if (status == 0) { 
          result = "success"; 
          return true; 
      } else { 
          result = "failed"; 
      } 
  } catch (IOException e) { 
      result = "IOException"; 
  } catch (InterruptedException e) { 
      result = "InterruptedException"; 
  } finally { 
      Log.d("----result---", "result = " + result); 
  } 
  return false;
}
相关标签: IT