ThinkAndroid架構 網路狀態監聽原理

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ThinkAndroid架構 網路狀態監聽原理，有需要的朋友可以參考下。

現在用到網路監聽的地方越來越廣泛，這裡提供下ThinkAndroid裡的實現方法，還是根據功能原理倒著給出代碼：

1、網路狀態會發出廣播，監聽網路狀態肯定通過廣播接收者實現，廣播接受者：

/** * @Title NetworkStateReceiver * @Package com.ta.util.netstate * @Description 是一個檢測網路狀態改變的，需要配置 <receiver *              android:name="com.ta.util.netstate.TANetworkStateReceiver" > *              <intent-filter> <action *              android:name="android.net.conn.CONNECTIVITY_CHANGE" /> <action *              android:name="android.gzcpc.conn.CONNECTIVITY_CHANGE" /> *              </intent-filter> </receiver> *  *              需要開啟許可權 <uses-permission *              android:name="android.permission.CHANGE_NETWORK_STATE" /> *              <uses-permission *              android:name="android.permission.CHANGE_WIFI_STATE" /> *              <uses-permission *              android:name="android.permission.ACCESS_NETWORK_STATE" /> *              <uses-permission *              android:name="android.permission.ACCESS_WIFI_STATE" /> * @author 白貓 * @date 2013-5-5 下午 22:47 * @version V1.2 */public class TANetworkStateReceiver extends BroadcastReceiver{private static Boolean networkAvailable = false;private static netType netType;private static ArrayList<TANetChangeObserver> netChangeObserverArrayList = new ArrayList<TANetChangeObserver>();private final static String ANDROID_NET_CHANGE_ACTION = "android.net.conn.CONNECTIVITY_CHANGE";public final static String TA_ANDROID_NET_CHANGE_ACTION = "ta.android.net.conn.CONNECTIVITY_CHANGE";private static BroadcastReceiver receiver;private static BroadcastReceiver getReceiver(){if (receiver == null){receiver = new TANetworkStateReceiver();}return receiver;}@Overridepublic void onReceive(Context context, Intent intent){receiver = TANetworkStateReceiver.this;if (intent.getAction().equalsIgnoreCase(ANDROID_NET_CHANGE_ACTION)|| intent.getAction().equalsIgnoreCase(TA_ANDROID_NET_CHANGE_ACTION)){TALogger.i(TANetworkStateReceiver.this, "網路狀態改變.");if (!TANetWorkUtil.isNetworkAvailable(context)){TALogger.i(TANetworkStateReceiver.this, "沒有網路連接.");networkAvailable = false;} else{TALogger.i(TANetworkStateReceiver.this, "網路連接成功.");netType = TANetWorkUtil.getAPNType(context);networkAvailable = true;}notifyObserver();}}/** * 註冊網路狀態廣播 *  * @param mContext */public static void registerNetworkStateReceiver(Context mContext){IntentFilter filter = new IntentFilter();filter.addAction(TA_ANDROID_NET_CHANGE_ACTION);filter.addAction(ANDROID_NET_CHANGE_ACTION);mContext.getApplicationContext().registerReceiver(getReceiver(), filter);}/** * 檢查網路狀態 *  * @param mContext */public static void checkNetworkState(Context mContext){Intent intent = new Intent();intent.setAction(TA_ANDROID_NET_CHANGE_ACTION);mContext.sendBroadcast(intent);}/** * 登出網路狀態廣播 *  * @param mContext */public static void unRegisterNetworkStateReceiver(Context mContext){if (receiver != null){try{mContext.getApplicationContext().unregisterReceiver(receiver);} catch (Exception e){// TODO: handle exceptionTALogger.d("TANetworkStateReceiver", e.getMessage());}}}/** * 擷取當前網路狀態，true為網路連接成功，否則網路連接失敗 *  * @return */public static Boolean isNetworkAvailable(){return networkAvailable;}public static netType getAPNType(){return netType;}private void notifyObserver(){for (int i = 0; i < netChangeObserverArrayList.size(); i++){TANetChangeObserver observer = netChangeObserverArrayList.get(i);if (observer != null){if (isNetworkAvailable()){observer.onConnect(netType);} else{observer.onDisConnect();}}}}/** * 註冊網路連接觀察者 *  * @param observerKey *            observerKey */public static void registerObserver(TANetChangeObserver observer){if (netChangeObserverArrayList == null){netChangeObserverArrayList = new ArrayList<TANetChangeObserver>();}netChangeObserverArrayList.add(observer);}/** * 登出網路連接觀察者 *  * @param resID *            observerKey */public static void removeRegisterObserver(TANetChangeObserver observer){if (netChangeObserverArrayList != null){netChangeObserverArrayList.remove(observer);}}}

2、廣播接受者接收到廣播後，是通過設定好的觀察者，傳遞迴資訊的，觀察者：

/** * @Title TANetChangeObserver * @Package com.ta.util.netstate * @Description 是檢測網路改變的觀察者 * @author 白貓 * @date 2013-1-22 下午 9:35 * @version V1.0 */public class TANetChangeObserver{/** * 網路連接串連時調用 */public void onConnect(netType type){}/** * 當前沒有網路連接 */public void onDisConnect(){}}

3、觀察者，就是一個監聽介面。廣播接收者裡用到的工具類：

/** * @Title NetWorkUtil * @Package com.ta.util.netstate * @Description 是檢測網路的一個工具包 * @author 白貓 * @date 2013-1-22 下午 9:35 * @version V1.0 */public class TANetWorkUtil{public static enum netType{wifi, CMNET, CMWAP, noneNet}/** * 網路是否可用 *  * @param context * @return */public static boolean isNetworkAvailable(Context context){ConnectivityManager mgr = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);NetworkInfo[] info = mgr.getAllNetworkInfo();if (info != null){for (int i = 0; i < info.length; i++){if (info[i].getState() == NetworkInfo.State.CONNECTED){return true;}}}return false;}/** * 判斷是否有網路串連 *  * @param context * @return */public static boolean isNetworkConnected(Context context){if (context != null){ConnectivityManager mConnectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);NetworkInfo mNetworkInfo = mConnectivityManager.getActiveNetworkInfo();if (mNetworkInfo != null){return mNetworkInfo.isAvailable();}}return false;}/** * 判斷WIFI網路是否可用 *  * @param context * @return */public static boolean isWifiConnected(Context context){if (context != null){ConnectivityManager mConnectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);NetworkInfo mWiFiNetworkInfo = mConnectivityManager.getNetworkInfo(ConnectivityManager.TYPE_WIFI);if (mWiFiNetworkInfo != null){return mWiFiNetworkInfo.isAvailable();}}return false;}/** * 判斷MOBILE網路是否可用 *  * @param context * @return */public static boolean isMobileConnected(Context context){if (context != null){ConnectivityManager mConnectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);NetworkInfo mMobileNetworkInfo = mConnectivityManager.getNetworkInfo(ConnectivityManager.TYPE_MOBILE);if (mMobileNetworkInfo != null){return mMobileNetworkInfo.isAvailable();}}return false;}/** * 擷取當前網路串連的類型資訊 *  * @param context * @return */public static int getConnectedType(Context context){if (context != null){ConnectivityManager mConnectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);NetworkInfo mNetworkInfo = mConnectivityManager.getActiveNetworkInfo();if (mNetworkInfo != null && mNetworkInfo.isAvailable()){return mNetworkInfo.getType();}}return -1;}/** *  * @author 白貓 *  *         擷取當前的網路狀態 -1：沒有網路 1：WIFI網路2：wap 網路3：net網路 *  * @param context *  * @return */public static netType getAPNType(Context context){ConnectivityManager connMgr = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);NetworkInfo networkInfo = connMgr.getActiveNetworkInfo();if (networkInfo == null){return netType.noneNet;}int nType = networkInfo.getType();if (nType == ConnectivityManager.TYPE_MOBILE){if (networkInfo.getExtraInfo().toLowerCase().equals("cmnet")){return netType.CMNET;}else{return netType.CMWAP;}} else if (nType == ConnectivityManager.TYPE_WIFI){return netType.wifi;}return netType.noneNet;}}

好了，網路監聽就用到這三個類，來看看ThinkAndroid是怎麼用的：

由於網路監聽是是對所有頁面起效，所以在Application建立的時候給廣播接收者設定一個全域的觀察者：

taNetChangeObserver = new TANetChangeObserver(){@Overridepublic void onConnect(netType type){// TODO Auto-generated method stubsuper.onConnect(type);TAApplication.this.onConnect(type);}@Overridepublic void onDisConnect(){// TODO Auto-generated method stubsuper.onDisConnect();TAApplication.this.onDisConnect();}};TANetworkStateReceiver.registerObserver(taNetChangeObserver);

/** * 當前沒有網路連接 */public void onDisConnect(){networkAvailable = false;if (currentActivity != null){currentActivity.onDisConnect();}}/** * 網路串連串連時調用 */protected void onConnect(netType type){// TODO Auto-generated method stubnetworkAvailable = true;if (currentActivity != null){currentActivity.onConnect(type);}}

ThinkAndroid架構 網路狀態監聽原理