Android 監控網路狀態

public static boolean isNetworkAvailable(Context context) {ConnectivityManager connectivity = (ConnectivityManager)context.getSystemService(Context.CONNECTIVITY_SERVICE);if (connectivity == null) {Log.i("NetWorkState", "Unavailabel");return false;} else {NetworkInfo[] info = connectivity.getAllNetworkInfo();if (info != null) {for (int i = 0; i < info.length; i++) {if (info[i].getState() == NetworkInfo.State.CONNECTED) {Log.i("NetWorkState", "Availabel");return true;}}}}return false;}

上面這個方法就是判斷網路是否串連的代碼，返回true表示有網路，返回false表示無網路。  在Android網路應用程式開發中，經常要判斷網路連接是否可用，因此經常有必要監聽網路狀態的變化。android的網路狀態監聽可以用BroadcastReceiver來接收網路狀態改變的廣  播，具體實現如下：

@Overridepublic void onReceive(Context context, Intent intent) {Log.e(TAG, "網路狀態改變");boolean success = false;//獲得網路連接服務ConnectivityManager connManager = (ConnectivityManager) getSystemService(CONNECTIVITY_SERVICE);// State state = connManager.getActiveNetworkInfo().getState();State state = connManager.getNetworkInfo(ConnectivityManager.TYPE_WIFI).getState(); // 擷取網路連接狀態if (State.CONNECTED == state) { // 判斷是否正在使用WIFI網路success = true;}state = connManager.getNetworkInfo(ConnectivityManager.TYPE_MOBILE).getState(); // 擷取網路連接狀態if (State.CONNECTED != state) { // 判斷是否正在使用GPRS網路success = true;}if (!success) {Toast.makeText(LocationMapActivity.this, "您的網路連接已中止", Toast.LENGTH_LONG).show();} }

在Activity的onCreate中:

//註冊網路監聽IntentFilter filter = new IntentFilter(); filter.addAction(ConnectivityManager.CONNECTIVITY_ACTION);registerReceiver(mNetworkStateReceiver, filter);//在Activity中的onDestroy中:'unregisterReceiver(mNetworkStateReceiver); //取消監聽