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，这样就可以让我优雅地关闭套接字，并重新打开它，如果网络立即重新连接。但我在文档中或通过搜索找不到类似内容。
如果您需要服务代码，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
答案 0 :(得分：18)
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然后执行您想要的操作。 ：）
答案 1 :(得分：11)
*在清单中设置这些权限
<uses-permission android:name="android.permission.CHANGE_WIFI_STATE" />
<uses-permission android:name="android.permission.CHANGE_NETWORK_STATE" />
*为清单中的这些操作过滤器注册BroadcastReceiver
<receiver android:name="com.myBroadcastReceiver" >
<intent-filter>
<action android:name="android.net.wifi.supplicant.CONNECTION_CHANGE" />
<action android:name="android.net.wifi.STATE_CHANGE" />
</intent-filter>
</receiver>
*定义BroadcastReceiver的实现
public class myBroadcastReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
WifiManager wifiManager = (WifiManager) context
.getSystemService(Context.WIFI_SERVICE);
NetworkInfo networkInfo = intent
.getParcelableExtra(WifiManager.EXTRA_NETWORK_INFO);
if (networkInfo != null) {
Log.d(AppConstants.TAG, "Type : " + networkInfo.getType()
+ "State : " + networkInfo.getState());
if (networkInfo.getType() == ConnectivityManager.TYPE_WIFI) {
//get the different network states
if (networkInfo.getState() == NetworkInfo.State.CONNECTING || networkInfo.getState() == NetworkInfo.State.CONNECTED) {
}
}
}
}
}
答案 2 :(得分：5)
我知道这是一个老问题，但请参阅以下开发人员文档：
http://developer.android.com/training/monitoring-device-state/connectivity-monitoring.html
答案 3 :(得分：2)
不确定这样做的确切方法，但我认为ConnectivityManager是一个很好的起点。
http://developer.android.com/reference/android/net/ConnectivityManager.html
您可以通过调用Context.getSystemService(Context.CONNECTIVITY_SERVICE)
你可以使用android.net中的其他一些好类。
希望有所帮助。