原文地址：http://blog.csdn.net/kongxiuqi/article/details/52524500
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WIFI状态变化会发送广播，一些可用的广播在WifiManger.java中可以看到。 广播一：WIFI 状态开关变化的监听，enabled，disabled等 /** * Broadcast intent action indicating that Wi-Fi has been enabled, disabled, * enabling, disabling, or unknown. One extra provides this state as an int. * Another extra provides the previous state, if available. * * @see #EXTRA_WIFI_STATE * @see #EXTRA_PREVIOUS_WIFI_STATE */ @SdkConstant(SdkConstantType.BROADCAST_INTENT_ACTION) public static final String WIFI_STATE_CHANGED_ACTION ="android.net.wifi.WIFI_STATE_CHANGED";
// 自定义个broadcast 在广播接收器Broadcast中判断， if (WifiManager.WIFI_STATE_CHANGED_ACTION.equals(intent.getAction())) {//这个监听wifi的打开与关闭，与wifi的连接无关 int wifiState = intent.getIntExtra(WifiManager.EXTRA_WIFI_STATE, 0); LogTag.showTAG_e("WIFI状态", "wifiState"+wifiState); switch (wifiState) { case WifiManager.WIFI_STATE_DISABLED: break; case WifiManager.WIFI_STATE_DISABLING: break; //} }
各个状态的值如下： /** * Wi-Fi is currently being disabled. The state will change to {@link #WIFI_STATE_DISABLED} if * it finishes successfully. * * @see #WIFI_STATE_CHANGED_ACTION * @see #getWifiState() */ public static final int WIFI_STATE_DISABLING = 0; /** * Wi-Fi is disabled. * * @see #WIFI_STATE_CHANGED_ACTION * @see #getWifiState() */ public static final int WIFI_STATE_DISABLED = 1; /** * Wi-Fi is currently being enabled. The state will change to {@link #WIFI_STATE_ENABLED} if * it finishes successfully. * * @see #WIFI_STATE_CHANGED_ACTION * @see #getWifiState() */ public static final int WIFI_STATE_ENABLING = 2; /** * Wi-Fi is enabled. * * @see #WIFI_STATE_CHANGED_ACTION * @see #getWifiState() */ public static final int WIFI_STATE_ENABLED = 3; /** * Wi-Fi is in an unknown state. This state will occur when an error happens while enabling * or disabling. * * @see #WIFI_STATE_CHANGED_ACTION * @see #getWifiState() */ public static final int WIFI_STATE_UNKNOWN = 4;广播二 wifi连接状态变化的监听// 这个监听wifi的连接状态即是否连上了一个有效无线路由，当上边广播的状态是WifiManager.WIFI_STATE_DISABLING，和WIFI_STATE_DISABLED的时候，根本不会接到这个广播。/** * Broadcast intent action indicating that the state of Wi-Fi connectivity * has changed. One extra provides the new state * in the form of a {@link android.net.NetworkInfo} object. If the new * state is CONNECTED, additional extras may provide the BSSID and WifiInfo of * the access point. * as a {@code String}. * @see #EXTRA_NETWORK_INFO * @see #EXTRA_BSSID * @see #EXTRA_WIFI_INFO */ @SdkConstant(SdkConstantType.BROADCAST_INTENT_ACTION) public static final String NETWORK_STATE_CHANGED_ACTION = "android.net.wifi.STATE_CHANGE";
// 在上边广播接到广播是WifiManager.WIFI_STATE_ENABLED状态的同时也会接到这个广播，当然刚打开wifi肯定还没有连接到有效的无线
if (WifiManager.NETWORK_STATE_CHANGED_ACTION.equals(intent.getAction())) {
Parcelable parcelableExtra = intent.getParcelableExtra(WifiManager.EXTRA_NETWORK_INFO);
if (null != parcelableExtra) {
NetworkInfo networkInfo = (NetworkInfo) parcelableExtra;
State state = networkInfo.getState();
boolean isConnected = state==State.CONNECTED;//当然，这边可以更精确的确定状态
LogTag.showTAG_e(this.getClass().getSimpleName(), "isConnected"+isConnected);
if(isConnected){
}else{
}
}
}
广播三 wifi扫描列表完成 /** * An access point scan has completed, and results are available from the supplicant. * Call {@link #getScanResults()} to obtain the results. {@link #EXTRA_RESULTS_UPDATED} * indicates if the scan was completed successfully. */ @SdkConstant(SdkConstantType.BROADCAST_INTENT_ACTION) public static final String SCAN_RESULTS_AVAILABLE_ACTION = "android.net.wifi.SCAN_RESULTS";wifi扫描完成，获取wili列表 可以通过wifimanager的startScan主动发起扫描，扫描完成后会发送这个广播if (WifiManager.SCAN_RESULTS_AVAILABLE_ACTION.equals(intent.getAction())) {Log.e(TAG, "WifiManager.SCAN_RESULTS_AVAILABLE_ACTION");WifiManager wifiManager = (WifiManager) context.getSystemService(Context.WIFI_SERVICE);List<ScanResult> list = wifiManager.getScanResults();for (int i = 0; i < list.size(); i++) {Log.e(TAG, list.get(i).toString());Log.e(TAG, "ScanResult SSID = " + list.get(i).SSID);} }getScanResults 只能得到可用的列表，获取所有wifi列表需用如下方法，该方法可以获取已连接过的但是不在范围内的wifi信息/** * Return a list of all the networks configured in the supplicant. * Not all fields of WifiConfiguration are returned. Only the following * fields are filled in: * <ul> * <li>networkId</li> * <li>SSID</li> * <li>BSSID</li> * <li>priority</li> * <li>allowedProtocols</li> * <li>allowedKeyManagement</li> * <li>allowedAuthAlgorithms</li> * <li>allowedPairwiseCiphers</li> * <li>allowedGroupCiphers</li> * </ul> * @return a list of network configurations in the form of a list * of {@link WifiConfiguration} objects. Upon failure to fetch or * when when Wi-Fi is turned off, it can be null. */ public List<WifiConfiguration> getConfiguredNetworks() {try {return mService.getConfiguredNetworks();} catch (RemoteException e) {Log.w(TAG, "Caught RemoteException trying to get configured networks: " + e);return null;} }广播四/** * Broadcast intent action indicating that a connection to the supplicant has * been established (and it is now possible * to perform Wi-Fi operations) or the connection to the supplicant has been * lost. One extra provides the connection state as a boolean, where {@code true} * means CONNECTED. * @see #EXTRA_SUPPLICANT_CONNECTED */ @SdkConstant(SdkConstantType.BROADCAST_INTENT_ACTION) public static final String SUPPLICANT_CONNECTION_CHANGE_ACTION ="android.net.wifi.supplicant.CONNECTION_CHANGE";另外还有一个监听网络状态变化的广播ConnectivityManager.CONNECTIVITY_ACTION/** * A change in network connectivity has occurred. A default connection has either * been established or lost. The NetworkInfo for the affected network is * sent as an extra; it should be consulted to see what kind of * connectivity event occurred. * <p/> * If this is a connection that was the result of failing over from a * disconnected network, then the FAILOVER_CONNECTION boolean extra is * set to true. * <p/> * For a loss of connectivity, if the connectivity manager is attempting * to connect (or has already connected) to another network, the * NetworkInfo for the new network is also passed as an extra. This lets * any receivers of the broadcast know that they should not necessarily * tell the user that no data traffic will be possible. Instead, the * receiver should expect another broadcast soon, indicating either that * the failover attempt succeeded (and so there is still overall data * connectivity), or that the failover attempt failed, meaning that all * connectivity has been lost. * <p/> * For a disconnect event, the boolean extra EXTRA_NO_CONNECTIVITY * is set to {@code true} if there are no connected networks at all. */ @SdkConstant(SdkConstantType.BROADCAST_INTENT_ACTION) public static final String CONNECTIVITY_ACTION = "android.net.conn.CONNECTIVITY_CHANGE";如果我们需要判断手机进入到某个wifi地区就可以通过该广播，以及扫描wifi列表进行实现代码如下
mIntentFilter = new IntentFilter(); mIntentFilter.addAction(ConnectivityManager.CONNECTIVITY_ACTION);registerReceiver(mReceiver, mIntentFilter);
或者在AndroidManifest中添加 <receiver android:name=".receiver.NetworkConnectChangedReceiver"><intent-filter><action android:name="android.net.conn.CONNECTIVITY_CHANGE" /><action android:name="android.net.wifi.WIFI_STATE_CHANGED" /><action android:name="android.net.wifi.STATE_CHANGE" /><action android:name="android.net.wifi.SCAN_RESULTS" /></intent-filter> </receiver>另外需要配置权限<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" /> <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" /> <uses-permission android:name="android.permission.CHANGE_WIFI_STATE" />
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