Android开发 网络检测（使用广播监听）

 1 /**
 2  * 检查网络是否连接
 3  * @param context
 4  * @return
 5  */
 6 public boolean isNetworkConnected(Context context) {
 7     if (context != null) {
 8         ConnectivityManager mConnectivityManager = (ConnectivityManager) context
 9                 .getSystemService(Context.CONNECTIVITY_SERVICE);
10         // 获取有效的网络信息
11         NetworkInfo mNetworkInfo = mConnectivityManager
12                 .getActiveNetworkInfo();
13         if (mNetworkInfo != null) {
14             // 返回网络是否可用
15             return mNetworkInfo.isAvailable();
16         }
17     }
18     return false;
19 }

 1 /**
 2  * 网络连接广播接收
 3  * @author Administrator
 4  *
 5  */
 6 private class CheckNetStateRecevicer extends BroadcastReceiver {
 7  
 8     @Override
 9     public void onReceive(Context context, Intent intent) {
10         // TODO Auto-generated method stub
11         if (intent.getAction().equals(
12                 ConnectivityManager.CONNECTIVITY_ACTION)) {
13             Log.i("Info", "网络状态已经改变");
14             cm = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);  // 获得网络连接服务
15             networkInfo = cm.getActiveNetworkInfo();    // 获得可用的网络信息
16  
17             if (networkInfo != null
18                     && networkInfo.getType() == ConnectivityManager.TYPE_MOBILE) {
19                 String netId = networkInfo.getExtraInfo();    // 获得手机接入点的网络模式
20                 Toast.makeText(context, "网络已连接至" + netId, Toast.LENGTH_SHORT)
21                 .show();
22             } else if (networkInfo != null
23                     && networkInfo.getType() == ConnectivityManager.TYPE_WIFI) {
24                 WifiManager wm = (WifiManager) getSystemService(Context.WIFI_SERVICE);
25                 String ssid = wm.getConnectionInfo().getSSID().toString();  // 获得WiFi接入点的名称
26                 Toast.makeText(context, "网络已连接至" + ssid, Toast.LENGTH_SHORT)
27                 .show();
28             } else {
29                 Toast.makeText(context, "网络出现异常", Toast.LENGTH_LONG).show();
30             }
31         }
32  
33     }
34 }