Android 通過WIFI狀態監聽廣播，判斷進入指定wifi范圍

原文地址：http://blog.csdn.net/kongxiuqi/article/details/52524500

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WIFI狀態變化會發送廣播，一些可用的廣播在WifiManger.java中可以看到。

廣播一：WIFI 狀態開關變化的監聽，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";

// 自定義個broadcast 在廣播接收器Broadcast中判斷，

?if?(WifiManager.WIFI_STATE_CHANGED_ACTION.equals(intent.getAction()))?{//這個監聽wifi的打開與關閉，與wifi的連接無關??
????????????int?wifiState?=?intent.getIntExtra(WifiManager.EXTRA_WIFI_STATE,?0);???
????????????LogTag.showTAG_e("WIFI狀態",?"wifiState"+wifiState);??
????????????switch?(wifiState)?{???
????????????case?WifiManager.WIFI_STATE_DISABLED:???
????????????????break;???
????????????case?WifiManager.WIFI_STATE_DISABLING:???
????????????????break;???
???????????//??
????????????}???
????????}

各個狀態的值如下：

/**
 * 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;
廣播二 wifi連接狀態變化的監聽
/**
 * 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";

?//?這個監聽wifi的連接狀態即是否連上了一個有效無線路由，當上邊廣播的狀態是WifiManager.WIFI_STATE_DISABLING，和WIFI_STATE_DISABLED的時候，根本不會接到這個廣播。??
????//?在上邊廣播接到廣播是WifiManager.WIFI_STATE_ENABLED狀態的同時也會接到這個廣播，當然剛打開wifi肯定還沒有連接到有效的無線??
????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;//當然，這邊可以更精確的確定狀態??
????????????????LogTag.showTAG_e(this.getClass().getSimpleName(),?"isConnected"+isConnected);??
????????????????if(isConnected){??
????????????????}else{??
??????????????????????
????????????????}??
????????????}????
????????} ?

廣播三 wifi掃描列表完成

/**
 * 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掃描完成，獲取wili列表 可以通過wifimanager的startScan主動發起掃描，掃描完成后會發送這個廣播
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，獲取所有wifi列表需用如下方法，該方法可以獲取已連接過的但是不在范圍內的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;}
}
廣播四 
/**
 * 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";
另外還有一個監聽網絡狀態變化的廣播
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";

如果我們需要判斷手機進入到某個wifi地區就可以通過該廣播，以及掃描wifi列表進行實現
代碼如下

public class NetworkConnectChangedReceiver extends BroadcastReceiver {private static final String TAG = NetworkConnectChangedReceiver.class.getSimpleName();@Override
    public void onReceive(Context context, Intent intent) {// 處理掃描完成廣播，根據掃描結果比對是否進入了某個特定wifi范圍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();
            // 此處循環遍歷，可以根據SSID 或者MAC，與某個指定wifi進行對比，如果相等可以認為進入了該wifi的范圍。
            for (int i = 0; i < list.size(); i++) {Log.e(TAG, list.get(i).toString());Log.e(TAG, "ScanResult SSID = " + list.get(i).SSID);}}// 這個監聽網絡連接的設置，包括wifi和移動數據的打開和關閉。.
        // 最好用的還是這個監聽。wifi如果打開，關閉，以及連接上可用的連接都會接到監聽。見log
        // 這個廣播的最大弊端是比上邊兩個廣播的反應要慢，如果只是要監聽wifi，我覺得還是用上邊兩個配合比較合適
        if (ConnectivityManager.CONNECTIVITY_ACTION.equals(intent.getAction())) {ConnectivityManager manager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);NetworkInfo gprs = manager.getNetworkInfo(ConnectivityManager.TYPE_MOBILE);NetworkInfo wifi = manager.getNetworkInfo(ConnectivityManager.TYPE_WIFI);Log.i(TAG, "網絡狀態改變:" + wifi.isConnected() + " 3g:" + gprs.isConnected());Log.e(TAG, "ConnectivityManager.CONNECTIVITY_ACTION");NetworkInfo info = intent.getParcelableExtra(ConnectivityManager.EXTRA_NETWORK_INFO);if (info != null) {Log.e(TAG, "info.getTypeName()" + info.getTypeName());Log.e(TAG, "getSubtypeName()" + info.getSubtypeName());Log.e(TAG, "getState()" + info.getState());Log.e(TAG, "getDetailedState()"
                        + info.getDetailedState().name());Log.e(TAG, "getDetailedState()" + info.getExtraInfo());Log.e(TAG, "getType()" + info.getType());if (NetworkInfo.State.CONNECTED == info.getState()) {} else if (info.getType() == 1) {if (NetworkInfo.State.DISCONNECTING == info.getState()) {Log.e(TAG, "disconnect");}}}
            // 開啟wifi掃描，掃描完成后發送廣播
            WifiManager wifiManager = (WifiManager) context.getSystemService(Context.WIFI_SERVICE);wifiManager.startScan();
        }}
}
需要注冊

    mIntentFilter = new IntentFilter();?mIntentFilter.addAction(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION);?mIntentFilter.addAction(WifiManager.NETWORK_STATE_CHANGED_ACTION);?mIntentFilter.addAction(WifiManager.WIFI_STATE_CHANGED_ACTION);?mIntentFilter.addAction(WifiManager.SUPPLICANT_CONNECTION_CHANGE_ACTION);

    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>
另外需要配置權限
<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" />