android– 如何通知wifi网络状态变化？

概述我正在编写一个通过wifi连接到telnet服务器的应用程序.我有一个管理套接字连接的服务.一切正常,但是当手机休眠时,它会断开wifi无线电,导致套接字连接中断(并抛出SocketException).我觉得我应该能够设置一个广播接收器,当wifi网络连接丢失时调用onResume()方法,这将允许我优雅地关

我正在编写一个通过wifi连接到telnet服务器的应用程序.我有一个管理套接字连接的服务.一切正常,但是当手机休眠时,它会断开wifi无线电,导致套接字连接中断(并抛出SocketException).

我觉得我应该能够设置一个广播接收器,当wifi网络连接丢失时调用onResume()方法,这将允许我优雅地关闭套接字,并在网络立即重新打开它重新连接.但我在文档或搜索中找不到类似的东西.

服务代码在这里,如果你需要它,感谢您的帮助,我真的很感激！

package com.wingedvictorydesign.lightfactoryRemote;import java.io.BufferedReader;import java.io.IOException;import java.io.inputStream;import java.io.inputStreamReader;import java.io.OutputStream;import java.net.InetSocketAddress;import java.net.socket;import java.net.socketException;import java.net.socketTimeoutException;import androID.app.Notification;import androID.app.notificationmanager;import androID.app.PendingIntent;import androID.app.Service;import androID.content.Intent;import androID.os.IBinder;import androID.os.RemoteCallbackList;import androID.os.remoteexception;import androID.text.Editable;import androID.util.Log;import androID.Widget.Toast;import androID.os.DeBUG;/** * @author Max */public class TelnetService extends Service {    private final int disCONNECTED = 0;    private final int CONNECTED = 1;    // place notifications in the notification bar    notificationmanager mNM;    protected inputStream in;    protected OutputStream out;    protected Socket socket;    // the socket timeout, to prevent blocking if the server connection is lost.    protected final int SO_TIMEOUT = 250;    // holds the incoming stream from socket until it is ready to be read.    BufferedReader inputBuffer;    final RemoteCallbackList<TelnetServiceCallback> mCallbacks =            new RemoteCallbackList<TelnetServiceCallback>();    @OverrIDe    public voID onCreate() {        super.onCreate();        Log.d("lightfactoryRemote", "TelnetService onCreate()");        mNM = (notificationmanager) getSystemService(NOTIFICATION_SERVICE);    }// end onCreate()    @OverrIDe    public voID onDestroy() {        super.onDestroy();        Log.d("lightfactoryRemote", "TelnetService onDestroy()");        // Cancel the persistent notification, if it hasn't been already.        mNM.cancel(R.string.telnet_service_connected);    }// end onDestroy()    @OverrIDe    public IBinder onBind(Intent intent) {        Log.d("lightfactoryRemote", "TelnetService onBind()");        return mBinder;    }    @OverrIDe    public boolean onUnbind(Intent intent) {        super.onUnbind(intent);        Log.d("lightfactoryRemote", "TelnetService onUnBind()");        return true;    }    @OverrIDe    public voID onStart(Intent intent, int startID) {        super.onStart(intent, startID);        Log.d("TelnetService", "TelnetService onStart()");    }    private final TelnetServiceInterface.Stub mBinder =            new TelnetServiceInterface.Stub() {        public voID registerCallback(TelnetServiceCallback cb) {            if (cb != null) mCallbacks.register(cb);        }        public voID unregisterCallback(TelnetServiceCallback cb) {            if (cb != null) mCallbacks.unregister(cb);        }        public String connectToTelnet(String Host, int Port)                throws remoteexception {            // androID.os.DeBUG.waitForDeBUGger();            String hostInfo = null;            try {                socket = new java.net.socket();                socket.setSoTimeout(SO_TIMEOUT);                socket.connect(new InetSocketAddress(Host, Port), 10000); //setup                // the port with a timeout of 10sec.                out = socket.getoutputStream();                /*                 * in is wrapped in a reader, then in a Buffered reader. This is                 * supposedly better for performance, and allows us to read a                 * line at a time using the readline() method.                 */                inputBuffer = new BufferedReader(new inputStreamReader(                    socket.getinputStream()));            } catch (java.io.IOException e) {                Log.d("TelnetService.java", "Connection Failed! " + e);                /*                 * if the connection fails, return null for serverResponse,                 * which will be handled appropriately on the clIEnt sIDe.                 */                return hostInfo;            }            // Now that the command has been sent, read the response.            hostInfo = readBuffer();            Log.d("TelnetService.java", hostInfo);            // notify the user that we are connected            showNotification(CONNECTED, Host, Port);            return hostInfo;        }// end connectToTelnet        /**         * Tests for a currently active connection. Three cases must be         * distinguished. 1. A connection attempt has not been made. Return         * false. 2. A connection attempt has been made, and socket is         * initialized, but no connection is active. isConnected() returns         * false. 3. A connection is active. isConnected() returns true.         */        public boolean areYouThere() {            if (socket != null) {                boolean connectStatus = socket.isConnected();                return connectStatus;            } else {                return false;            }        }// end areYouThere        public voID disconnect() {            try {                if (inputBuffer != null) {                    inputBuffer.close();                }                if (socket != null) {                    socket.close();                }            } catch (IOException e) {}            // Cancel the persistent notification.            mNM.cancel(R.string.telnet_service_connected);        }// end disconnect()        /**         * send the string to the telnet server, and return the response from         * server If the connection is lost, an IOException results, so return         * null to be handled appropriately on the clIEnt-sIDe.         *          * @throws remoteexception         */        public String sendToTelnet(String toTelnet) throws remoteexception {            if (out == null) {                /*                 * if out is still null, no connection has been made. Throw                 * remoteexception to be handled on the clIEnt sIDe.                 */                throw new remoteexception();            } else {                byte arr[];                arr = (toTelnet + "\r" + "\n").getBytes();                try {                    out.write(arr);                    // Now that the command has been sent, read the response.                    String serverResponse = readBuffer();                    return serverResponse;                } catch (IOException e) {                    /*                     * if a connection was made, but then lost, we end up here.                     * throw a remoteexception for handling by the clIEnt.                     */                    Log.d("TelnetService", "IO exception" + e);                    disconnect();                    throw new remoteexception();                }            }// end else        }// end sendToTelnet    };// end ConnectService.Stub class    public String readBuffer() {        StringBuilder serverResponse = new StringBuilder();        int character;        try {            // keep reading new lines into line until there are none left.            while (inputBuffer.ready()) {                /*                 * as each character is read, append it to serverResponse,                 * throwing away the carriage returns (which read as glyphs),                 * and the ">" prompt symbols.                 */                character = inputBuffer.read();                if ((character != 13) && (character != 62)) {                    serverResponse.append((char) character);                }            }        }// end try        catch (SocketTimeoutException e) {            Log.d("TelnetService read()", "SocketTimeoutException");        } catch (IOException e) {            Log.d("TelnetService read()", "read() IO exception" + e);        }        return serverResponse.toString();    }    /**     * Show a notification while this service is running.     */    private voID showNotification(int event, String Host, int Port) {        // In this sample, we'll use the same text for the ticker and the        // expanded notification        CharSequence notificationText = "Connected to " + Host + " : " + Port;        // Set the icon, scrolling text and timestamp        Notification notification = new Notification(            R.drawable.notbar_connected, notificationText,            System.currentTimeMillis());        // set the notification not to clear when the user hits        // "Clear All Notifications"        notification.flags |= Notification.FLAG_NO_CLEAR;        // The PendingIntent to launch our activity if the user selects this        // notification        PendingIntent contentIntent = PendingIntent.getActivity(this, 0,            new Intent(this, lightfactoryRemote.class), 0);        // Set the info for the vIEws that show in the notification panel.        notification.setLatestEventInfo(this,            getText(R.string.telnet_service_connected), notificationText,            contentIntent);        // Send the notification.        // We use a string ID because it is a unique number. We use it later to        // cancel.        mNM.notify(R.string.telnet_service_connected, notification);    }// end showNotification()} // end TelnetConnection

解决方法:

为ConnectivityManager.CONNECTIVITY_ACTION注册broadcastReceiver.在onReceive处理程序中,您可以调用NetworkInfo info =(NetworkInfo)intent.getParcelableExtra(ConnectivityManager.EXTRA_NETWORK_INFO),然后调用info.getType()并检查ConnectivityManager.TYPE_WIFI并执行您想要的 *** 作. 总结

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