Android-驗證網絡是否可用

ConnectivityManager主要管理和網絡連接相關的操作，NetworkInfo類包含了對wifi和mobile兩種網絡模式連接的詳細描述,通過其getState()方法獲取的State對象則代表著連接成功與否等狀態。

CONNECTED Detailed state Coarse-grained state IDLE DISCONNECTED SCANNING CONNECTING CONNECTING CONNECTING AUTHENTICATING CONNECTING CONNECTED DISCONNECTING DISCONNECTING DISCONNECTED DISCONNECTED UNAVAILABLE DISCONNECTED FAILED DISCONNECTED State state = connectivityManager.getNetworkInfo(ConnectivityManager.TYPE_MOBILE).getState();
if(State.CONNECTED==state){
Log.i("TAG", "GPRS網絡已連接");
}

state = connectivityManager.getNetworkInfo(ConnectivityManager.TYPE_WIFI).getState();
if(State.CONNECTED==state){
Log.i("TAG“, "WIFI網絡已連接");
}

1. //判斷網絡是否可用
3. public static boolean isNetworkAvaiable(Context context){
4. ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService(CONNECTIVITY_SERVICE);
5. NetworkInfo info = connectivityManager.getActiveNetworkInfo(); // 獲取代表聯網狀態的NetWorkInfo對象
6. return (info != null && info.isConnected());
7. }
9. //判斷WIFI是否可用
11. public static boolean isWifiActive(Context context){
13. ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService(CONNECTIVITY_SERVICE);
14. NetworkInfo[] info = connectivityManager.getAllNetworkInfo();
15. if(info!=null){
16. for(int i=0;i<info.length;i++){
17. //
18. if(info[i].getTypeName().equals(ConnectivityManager.TYPE_WIFI)&& info[i].isConnected())
19. return true;
20. }
21. }
22. return false;
23. }

ConnectivityManager.TYPE_WIFI 表示wifi連接

ConnectivityManager.TYPE_MOBILE 表示3G連接

網絡設置Intent:

new Intent(Android.provider.Settings.ACTION_WIRELESS_SETTINGS) // 跳轉到無線網絡設置界面

new Intent(android.provider.Settings.ACTION_WIFI_SETTINGS) // 跳轉到無線wifi網絡設置界面

最後別忘了在mainifest文件中加上權限：

"<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>"