你好
您是否知道如何检测连接到wifi网络的设备？ 我使用这个java代码源来检测连接到家庭网络的设备：
import java.io.IOException;
import java.net.ServerSocket;
import android.net.nsd.NsdManager;
import android.net.nsd.NsdManager.DiscoveryListener;
import android.net.nsd.NsdManager.RegistrationListener;
import android.net.nsd.NsdManager.ResolveListener;
import android.net.nsd.NsdServiceInfo;
import android.os.Bundle;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.content.Context;
import android.util.Log;
import android.view.Menu;
@SuppressLint("NewApi")
public class MainActivity extends Activity {
NsdManager.RegistrationListener mRegistrationListener;
NsdManager.DiscoveryListener mDiscoveryListener;
String mServiceName;
NsdServiceInfo mServiceInfo;
ServerSocket mServerSocket;
int mLocalPort;
NsdManager mNsdManager;
final String TAG = "---Networking";
final String SERVICE_TYPE = "_http._tcp.";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// Initialize a server socket on the next available port.
try {
mServerSocket = new ServerSocket(0);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
// Store the chosen port.
mLocalPort = mServerSocket.getLocalPort();
registerService(mLocalPort);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
public void registerService(int port) {
// Create the NsdServiceInfo object, and populate it.
mServiceInfo = new NsdServiceInfo();
// The name is subject to change based on conflicts
// with other services advertised on the same network.
mServiceInfo.setServiceName("NsdChat");
mServiceInfo.setServiceType("_http._tcp.");
mServiceInfo.setPort(port);
mNsdManager = (NsdManager) getApplicationContext().getSystemService(Context.NSD_SERVICE);
initializeRegistrationListener();
initializeDiscoveryListener();
mNsdManager.registerService(
mServiceInfo, NsdManager.PROTOCOL_DNS_SD, mRegistrationListener);
mNsdManager.discoverServices(
SERVICE_TYPE, NsdManager.PROTOCOL_DNS_SD, mDiscoveryListener);
}
public void initializeRegistrationListener() {
mRegistrationListener = new NsdManager.RegistrationListener() {
@Override
public void onServiceRegistered(NsdServiceInfo NsdServiceInfo) {
// Save the service name. Android may have changed it in order to
// resolve a conflict, so update the name you initially requested
// with the name Android actually used.
mServiceName = NsdServiceInfo.getServiceName();
Log.d(TAG, "Service name: " + mServiceName);
Log.d(TAG , "Port number: " + mLocalPort);
}
@Override
public void onRegistrationFailed(NsdServiceInfo serviceInfo, int errorCode) {
// Registration failed! Put debugging code here to determine why.
Log.d(TAG , "Registration Failed! Error code: " + errorCode);
}
@Override
public void onServiceUnregistered(NsdServiceInfo arg0) {
// Service has been unregistered. This only happens when you call
// NsdManager.unregisterService() and pass in this listener.
Log.d(TAG , "Service unregistered.");
}
@Override
public void onUnregistrationFailed(NsdServiceInfo serviceInfo, int errorCode) {
// Unregistration failed. Put debugging code here to determine why.
Log.d(TAG , "Unregistration failed!");
}
};
}
public void initializeDiscoveryListener() {
// Instantiate a new DiscoveryListener
mDiscoveryListener = new NsdManager.DiscoveryListener() {
// Called as soon as service discovery begins.
@Override
public void onDiscoveryStarted(String regType) {
Log.d(TAG , "Service discovery started");
}
@Override
public void onServiceFound(NsdServiceInfo service) {
// A service was found! Do something with it.
Log.d(TAG, "Service discovery success: " + service);
if (!service.getServiceType().equals(SERVICE_TYPE)) {
// Service type is the string containing the protocol and
// transport layer for this service.
Log.d(TAG, "Unknown Service Type: " + service.getServiceType());
} else if (service.getServiceName().equals(mServiceName)) {
// The name of the service tells the user what they'd be
// connecting to. It could be "Bob's Chat App".
Log.d(TAG, "Same machine: " + mServiceName);
} else if (service.getServiceName().contains("NsdChat")){
mNsdManager.resolveService(service, new NsdManager.ResolveListener() {
@Override
public void onServiceResolved(NsdServiceInfo serviceInfo) {
// TODO Auto-generated method stub
Log.d(TAG, "Resolving service...");
}
@Override
public void onResolveFailed(NsdServiceInfo serviceInfo, int errorCode) {
// TODO Auto-generated method stub
Log.d(TAG, "Service resolve failed!");
}
});
}
}
@Override
public void onServiceLost(NsdServiceInfo service) {
// When the network service is no longer available.
// Internal bookkeeping code goes here.
Log.e(TAG, "service lost: " + service);
}
@Override
public void onDiscoveryStopped(String serviceType) {
Log.i(TAG, "Discovery stopped: " + serviceType);
}
@Override
public void onStartDiscoveryFailed(String serviceType, int errorCode) {
Log.e(TAG, "Discovery failed: Error code: " + errorCode);
mNsdManager.stopServiceDiscovery(this);
}
@Override
public void onStopDiscoveryFailed(String serviceType, int errorCode) {
Log.e(TAG, "Discovery failed: Error code: " + errorCode);
mNsdManager.stopServiceDiscovery(this);
}
};
}
}
但我有这个结果。在此结果中，端口号和主机名为空。
02-15 19:10:58.205 21554-21554/com.example.fatma.myapplication W/asset﹕ AssetManager-->addDefaultAssets CIP path not exsit!
02-15 19:10:58.490 21554-21554/com.example.fatma.myapplication V/PhoneWindow﹕ DecorView setVisiblity: visibility = 4
02-15 19:10:58.567 21554-21591/com.example.fatma.myapplication D/---Networking﹕ Service discovery started
02-15 19:10:58.572 21554-21591/com.example.fatma.myapplication D/---Networking﹕ Service discovery success: name: NsdChattype: _http._tcp.host: nullport: 0txtRecord: null
02-15 19:10:58.594 21554-21591/com.example.fatma.myapplication D/---Networking﹕ Service discovery success: name: NsdChattype: _http._tcp.host: nullport: 0txtRecord: null
02-15 19:10:58.597 21554-21591/com.example.fatma.myapplication D/---Networking﹕ Service discovery success: name: NsdChat (2)type: _http._tcp.host: nullport: 0txtRecord: null
02-15 19:10:58.598 21554-21591/com.example.fatma.myapplication D/---Networking﹕ Service discovery success: name: NsdChat (2)type: _http._tcp.host: nullport: 0txtRecord: null
02-15 19:10:58.598 21554-21591/com.example.fatma.myapplication D/---Networking﹕ Service resolve failed!
02-15 19:10:58.599 21554-21591/com.example.fatma.myapplication D/---Networking﹕ Service resolve failed!
02-15 19:10:58.601 21554-21591/com.example.fatma.myapplication D/---Networking﹕ Service resolve failed!
02-15 19:10:58.625 21554-21554/com.example.fatma.myapplication V/PhoneWindow﹕ DecorView setVisiblity: visibility = 0
02-15 19:10:58.835 21554-21554/com.example.fatma.myapplication D/libEGL﹕ loaded /system/lib/egl/libEGL_mali.so
02-15 19:10:58.859 21554-21554/com.example.fatma.myapplication D/libEGL﹕ loaded /system/lib/egl/libGLESv1_CM_mali.so
02-15 19:10:58.879 21554-21554/com.example.fatma.myapplication D/libEGL﹕ loaded /system/lib/egl/libGLESv2_mali.so
02-15 19:10:58.915 21554-21554/com.example.fatma.myapplication I/﹕ appName=com.example.fatma.myapplication, acAppName=eu.chainfire.cfbench
02-15 19:10:58.915 21554-21554/com.example.fatma.myapplication I/﹕ 0
02-15 19:10:58.917 21554-21591/com.example.fatma.myapplication D/---Networking﹕ Resolving service...
02-15 19:10:58.934 21554-21554/com.example.fatma.myapplication I/﹕ appName=com.example.fatma.myapplication, acAppName=com.android.cts.openglperf
02-15 19:10:58.934 21554-21554/com.example.fatma.myapplication I/﹕ 0
02-15 19:10:58.934 21554-21554/com.example.fatma.myapplication I/﹕ appName=com.example.fatma.myapplication, acAppName=com.android.browser
02-15 19:10:58.934 21554-21554/com.example.fatma.myapplication I/﹕ 0
02-15 19:10:58.960 21554-21554/com.example.fatma.myapplication I/﹕ [Mali]surface->num_buffers=4, surface->num_frames=3, win_min_undequeued=1
02-15 19:10:58.960 21554-21554/com.example.fatma.myapplication I/﹕ [Mali]max_allowed_dequeued_buffers=3
02-15 19:10:58.983 21554-21554/com.example.fatma.myapplication D/OpenGLRenderer﹕ Enabling debug mode 0
02-15 19:10:59.318 21554-21554/com.example.fatma.myapplication D/OpenGLRenderer﹕ PatchDescription: bitmapWidth=24.00, bitmapWidth=24.00, pixelWidth=480.00, pixelHeight=24.00, width=2, height=2, quadCnt=6, transQuadCnt=3, colorKey=56
02-15 19:10:59.318 21554-21554/com.example.fatma.myapplication D/OpenGLRenderer﹕ patch: bitmapWidth=24.00, bitmapHeight=24.00, left=0.00, top=0.00, right=480.00, bottom=24.00, verticesCount=18
02-15 19:10:59.726 21554-21591/com.example.fatma.myapplication D/---Networking﹕ Service name: NsdChat (3)
02-15 19:10:59.726 21554-21591/com.example.fatma.myapplication D/---Networking﹕ Port number: 38911
02-15 19:10:59.980 21554-21591/com.example.fatma.myapplication D/---Networking﹕ Service discovery success: name: NsdChat (3)type: _http._tcp.host: nullport: 0txtRecord: null
02-15 19:10:59.980 21554-21591/com.example.fatma.myapplication D/---Networking﹕ Same machine: NsdChat (3)
02-15 19:10:59.980 21554-21591/com.example.fatma.myapplication D/---Networking﹕ Service discovery success: name: NsdChat (3)type: _http._tcp.host: nullport: 0txtRecord: null
02-15 19:10:59.980 21554-21591/com.example.fatma.myapplication D/---Networking﹕ Same machine: NsdChat (3)
请帮助我。
答案 0 :(得分：0)
检查WiFi的方法是：
public boolean isWifiAvailable(Context context){
boolean wifiConnected = false;
ConnectivityManager connMgr =
(ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo activeInfo = connMgr.getActiveNetworkInfo();
if (activeInfo != null && activeInfo.isConnected()) {
wifiConnected = activeInfo.getType() == ConnectivityManager.TYPE_WIFI;
} else {
wifiConnected = false;
}
return wifiConnected;
}
从任何Activity或Service调用此方法，如下所示：
isWifiAvailable(this)
其中this是Context，它将返回true或false。希望这会有所帮助：）