Android判断网络状态方法详解

Android 判断网络状态这一应用技巧在实际应中是比较重要的。那么，在Android操作系统中，如何能够正确的判断我们所连接的网络是否断开恩？今天我们就针对这一应用技巧进行一个详细的分析。 

Java代码  

1. //注册一个广播接收者，接收网络连接状态改变广播
2. public class ConnectionChangeReceiver extends
3. @Override
4. public void
5.         ConnectivityManager connectivityManager = (ConnectivityManager) context  
6.                 .getSystemService(Context.CONNECTIVITY_SERVICE);  
7.         NetworkInfo activeNetInfo = connectivityManager  
8.                 .getActiveNetworkInfo();  
9.         NetworkInfo mobNetInfo = connectivityManager  
10.                 .getNetworkInfo(ConnectivityManager.TYPE_MOBILE);  
11. if (activeNetInfo != null) {  
12.             Toast.makeText(context,  
13. "Active Network Type : "
14.                     Toast.LENGTH_SHORT).show();  
15.         }  
16. if (mobNetInfo != null) {  
17.             Toast.makeText(context,  
18. "Mobile Network Type : "
19.                     Toast.LENGTH_SHORT).show();  
20.         }  
21.     }  
22. }

<!-- Needed to check when the network connection changes --> 

Java代码  

1. <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>  
2. <receiver  
3. "com.blackboard.androidtest.receiver.ConnectionChangeReceiver"
4. "NetworkConnection">   
5.     <intent-filter>   
6. "android.net.conn.CONNECTIVITY_CHANGE"/>   
7.     </intent-filter>  
8. </receiver>

另一种方法： 

Java代码  

1. public boolean
2.     Context context = getApplicationContext();  
3.     ConnectivityManager connectivity = (ConnectivityManager) context  
4.             .getSystemService(Context.CONNECTIVITY_SERVICE);  
5. if (connectivity == null) {  
6. this.getString(R.string.alert),  
7. "getSystemService rend null");  
8. else {//获取所有网络连接信息
9.         NetworkInfo[] info = connectivity.getAllNetworkInfo();  
10. if (info != null) {//逐一查找状态为已连接的网络
11. for (int i = 0; i < info.length; i++) {  
12. if
13. return true;  
14.                 }  
15.             }  
16.         }  
17.     }  
18. return false;  
19. }