通常對於android手機,咱們能夠經過sdk提供的方法判斷網絡狀況android
/** * 獲取當前的網絡狀態 :沒有網絡-0:WIFI網絡1:4G網絡-4:3G網絡-3:2G網絡-2 * 自定義 * * @param context * @return */ public static int getAPNType(Context context) { //結果返回值 int netType = 0; //獲取手機全部鏈接管理對象 ConnectivityManager manager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE); //獲取NetworkInfo對象 NetworkInfo networkInfo = manager.getActiveNetworkInfo(); //NetworkInfo對象爲空 則表明沒有網絡 if (networkInfo == null) { return netType; } //不然 NetworkInfo對象不爲空 則獲取該networkInfo的類型 int nType = networkInfo.getType(); if (nType == ConnectivityManager.TYPE_WIFI) { //WIFI netType = 1; } else if (nType == ConnectivityManager.TYPE_MOBILE) { int nSubType = networkInfo.getSubtype(); TelephonyManager telephonyManager = (TelephonyManager) context.getSystemService(Context.TELEPHONY_SERVICE); //3G 聯通的3G爲UMTS或HSDPA 電信的3G爲EVDO if (nSubType == TelephonyManager.NETWORK_TYPE_LTE && !telephonyManager.isNetworkRoaming()) { netType = 4; } else if (nSubType == TelephonyManager.NETWORK_TYPE_UMTS || nSubType == TelephonyManager.NETWORK_TYPE_HSDPA || nSubType == TelephonyManager.NETWORK_TYPE_EVDO_0 && !telephonyManager.isNetworkRoaming()) { netType = 3; //2G 移動和聯通的2G爲GPRS或EGDE,電信的2G爲CDMA } else if (nSubType == TelephonyManager.NETWORK_TYPE_GPRS || nSubType == TelephonyManager.NETWORK_TYPE_EDGE || nSubType == TelephonyManager.NETWORK_TYPE_CDMA && !telephonyManager.isNetworkRoaming()) { netType = 2; } else { netType = 2; } } return netType; }
注意的是對於Tv項目,android系統的Tv(好比小米電視),有的是支持有線鏈接的(非wifi,2g 3g 4g)的 , 此時上述方法會判斷爲0,無網絡鏈接狀態,因此對於Tv項目,須要對網絡適配進行兼容網絡
解決辦法就是ping一個外網。app
/* * @category 判斷是否有外網鏈接(普通方法不能判斷外網的網絡是否鏈接,好比鏈接上局域網) * @return */ public static final boolean ping() { String result = null; try { String ip = "www.baidu.com";// ping 的地址,能夠換成任何一種可靠的外網 Process p = Runtime.getRuntime().exec("ping -c 3 -w 100 " + ip);// ping網址3次 // 讀取ping的內容,能夠不加 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的狀態 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; }
由此能夠對網絡狀態進行: 有線/wifi/2g/3g/4g的區分spa