使用WifiManager和ScanResult进行Wifi操作
Wifi上分为几部分：
1 获取周围的热点；
2 标识出取到的热点的加密方法；
3 连接不加密Wifi，手动输入有密码的Wifi；
4 保存连接好的Wifi到系统中；
一共四部分；
用到Wifi部分的接口有：
android.net.wifi.WifiManager类；
接收Wifi的反馈，并没有找到系统提供的接口，这里使用的是通过接收不同的广播来进行判断wifi的连接结果；
private WifiManager mWifiManager;
mWifiManager = (WifiManager) context.getSystemService(Context.WIFI_SERVICE);
然后接着使用的是：
打开Wifi：
mWifiManager.setWifiEnabled(true);
同理关闭Wifi也是这个接口；
打开Wifi的同时，系统会默认去遍历已经连接过的Wifi热点，进行连接，这部分连接工作都是交给系统完成即可；启动Wifi热点列表扫描。
mWifiManager.startScan();
那么它的结果呢，就是在广播接收器中调用：
List
进行获取扫描结果；
接着分为对有密码的wifi连接和对无密码的wifi进行连接：
private void connectWifi(){
WifiConfiguration wifiConfig;
wifiConfig = wifiHelper.setWifiParams("TP-LINK_2.4GHz_F983");
// 连接没有密码的Wifi热点如下
// wifiConfig = wifiHelper.setWifiParamsNoPassword("TP-LINK_2.4GHz_F982");
int wcgID = mWifiManager.addNetwork(wifiConfig);
boolean flag = mWifiManager.enableNetwork(wcgID, true);
textView.setText("启动连接：" + flag + "\n");
}
//其中调用函数如下进行有密码Wifi连接：
public WifiConfiguration setWifiParams(String ssid) {
String gol_password = "123456789";
WifiConfiguration apConfig = new WifiConfiguration();
apConfig.SSID = "\"" + ssid + "\"";
apConfig.preSharedKey = "\"" + gol_password + "\"";
apConfig.hiddenSSID = true;
apConfig.status = WifiConfiguration.Status.ENABLED;
apConfig.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.TKIP);
apConfig.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.CCMP);
apConfig.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.WPA_PSK);
apConfig.allowedPairwiseCiphers
.set(WifiConfiguration.PairwiseCipher.TKIP);
apConfig.allowedPairwiseCiphers
.set(WifiConfiguration.PairwiseCipher.CCMP);
apConfig.allowedProtocols.set(WifiConfiguration.Protocol.RSN);
return apConfig;
}
//其中调用函数如下进行无密码Wifi连接：
public WifiConfiguration setWifiParamsNoPassword(String ssid) {
String SSID = ssid;
WifiConfiguration config = new WifiConfiguration();
config.allowedAuthAlgorithms.clear();
config.allowedGroupCiphers.clear();
config.allowedKeyManagement.clear();
config.allowedPairwiseCiphers.clear();
config.allowedProtocols.clear();
config.SSID = "\"" + SSID + "\"";
// 没有密码，一定要注释这两个值
// config.wepKeys[0] = "";
// config.wepTxKeyIndex = 0;
config.allowedAuthAlgorithms
.set(WifiConfiguration.AuthAlgorithm.SHARED);
config.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.CCMP);
config.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.TKIP);
config.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.WEP40);
config.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.WEP104);
config.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.NONE);
// WifiManager wifiManager = (WifiManager)
// mContext.getSystemService(Context.WIFI_SERVICE);
// wifiManager.enableNetwork(wifiManager.addNetwork(config), true);
return config;
}
// 保存到系统中，重启后有效
mWifiManager.saveConfiguration();
这样是保存所有的连接情况，也可以说是当前的情况，因为当前就是连接了一个热点；
删除某个已经保存好的Wifi热点：
List existingConfigs；
existingConfigs= wifiManager.getConfiguredNetworks();
for (WifiConfiguration existingConfig : existingConfigs) {
if (existingConfig.SSID.equals("\"" + SSID + "\"")) {
mWifiManager.removeNetwork(existingConfig.networkId);
}
} 获取当前连接好的Wifi热点：
private String getCurrentWifi(){
WifiManager wifiMgr = (WifiManager) getSystemService(Context.WIFI_SERVICE);
int wifiState = wifiMgr.getWifiState();
WifiInfo info = wifiMgr.getConnectionInfo();
String ssid = info != null ? info.getSSID() : "null";
String state = "";
switch (wifiState) {
case 0:
state = "WIFI_STATE_DISABLING";
break;
case 1:
state = "WIFI_STATE_DISABLED";
break;
case 2:
state = "WIFI_STATE_ENABLING";
break;
case 3:
state = "WIFI_STATE_ENABLED";
break;
case 4:
state = "WIFI_STATE_UNKNOWN";
break;
default:
break;
}
btn_currentWifiName.setText("当前wifi：[" + ssid + "](" + state + ")");
return ssid;
}下面着重看一下Wifi列表的获取和连接状态和验证返回结果：
获取结果：
textView.setText("扫描到的wifi列表\n");
if (scanResult == null) {
Toast.makeText(getApplicationContext(), "扫描列表为空",Toast.LENGTH_SHORT).show();
textView.append("\n扫描列表为空");
return;
}
for (int i = 0; i < scanResult.size(); i++) {
textView.append(scanResult.get(i).SSID + "："+ getEncryption(scanResult.get(i)) + "\n");
}
private String getEncryption(ScanResult scanResult) {
if (!TextUtils.isEmpty(scanResult.SSID)) {
String capabilities = scanResult.capabilities;
Log.i("hefeng", "[" + scanResult.SSID + "]" + capabilities);
if (!TextUtils.isEmpty(capabilities)) {
if (capabilities.contains("WPA")
|| capabilities.contains("wpa")) {
Log.i("hefeng", "wpa");
return "wpa";
} else if (capabilities.contains("WEP")
|| capabilities.contains("wep")) {
Log.i("hefeng", "wep");
return "wep";
} else {
Log.i("hefeng", "no");
return "no password";
}
}
}
return scanResult.capabilities.toString();
}接下来是Wifi广播的情况了：
//注册：
private void wifiRegister(){
IntentFilter filter = new IntentFilter();
// filter.addAction(WifiManager.ERROR_AUTHENTICATING);
filter.addAction(WifiManager.ACTION_PICK_WIFI_NETWORK);
filter.addAction(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION);
filter.addAction(WifiManager.RSSI_CHANGED_ACTION);
filter.addAction(ConnectivityManager.CONNECTIVITY_ACTION);
// 测试wifi验证密码错误问题
filter.addAction(WifiManager.SUPPLICANT_STATE_CHANGED_ACTION);
registerReceiver(new WifiReceiver(), filter);
}
//接收：
class WifiReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
scanResult = mWifiManager.getScanResults();
String action = intent.getAction();
textView.append(action);
Log.i("WifiReceiver", action);
// / Wifi 状态变化
if (WifiManager.SUPPLICANT_STATE_CHANGED_ACTION.equals(action)) {
WifiInfo info = mWifiManager.getConnectionInfo();
SupplicantState state = info.getSupplicantState();
if (state == SupplicantState.COMPLETED) {
textView.append("(验证成功)");
Log.i("WifiReceiver", "(验证成功)");
}
int errorCode = intent.getIntExtra(
WifiManager.EXTRA_SUPPLICANT_ERROR, -1);
if (errorCode == WifiManager.ERROR_AUTHENTICATING) {
textView.append("(验证失败)");
Log.i("WifiReceiver", "(验证失败)");
}
}
textView.append("\n");
}
}大体如下：
验证成功的输出Log：
01-01 00:22:38.970: I/WifiReceiver(5515): android.net.wifi.supplicant.STATE_CHANGE
01-01 00:22:41.440: I/WifiReceiver(5515): android.net.wifi.SCAN_RESULTS
01-01 00:22:41.450: I/WifiReceiver(5515): android.net.wifi.supplicant.STATE_CHANGE
01-01 00:22:41.460: I/WifiReceiver(5515): android.net.wifi.supplicant.STATE_CHANGE
01-01 00:22:41.770: I/WifiReceiver(5515): android.net.wifi.supplicant.STATE_CHANGE
01-01 00:22:41.880: I/WifiReceiver(5515): android.net.wifi.supplicant.STATE_CHANGE
01-01 00:22:41.880: I/WifiReceiver(5515): (验证成功)
01-01 00:22:41.930: I/WifiReceiver(5515): android.net.wifi.supplicant.STATE_CHANGE
01-01 00:22:41.940: I/WifiReceiver(5515): (验证成功)
01-01 00:22:44.890: I/WifiReceiver(5515): android.net.wifi.RSSI_CHANGED
01-01 00:22:45.580: I/WifiReceiver(5515): android.net.conn.CONNECTIVITY_CHANGE
01-01 00:22:45.590: I/WifiReceiver(5515): android.net.conn.CONNECTIVITY_CHANGE
验证失败的输出Log：
01-01 00:20:53.800: I/WifiReceiver(5249): android.net.wifi.supplicant.STATE_CHANGE
01-01 00:20:56.060: I/WifiReceiver(5249): android.net.wifi.SCAN_RESULTS
01-01 00:20:56.320: I/WifiReceiver(5249): android.net.wifi.supplicant.STATE_CHANGE
01-01 00:20:56.350: I/WifiReceiver(5249): android.net.wifi.supplicant.STATE_CHANGE
01-01 00:20:56.810: I/WifiReceiver(5249): android.net.wifi.supplicant.STATE_CHANGE
01-01 00:21:03.230: I/WifiReceiver(5249): android.net.wifi.supplicant.STATE_CHANGE
01-01 00:21:03.240: I/WifiReceiver(5249): (验证失败)
01-01 00:21:03.330: I/WifiReceiver(5249): android.net.wifi.supplicant.STATE_CHANGE
01-01 00:21:04.610: I/WifiReceiver(5249): android.net.wifi.SCAN_RESULTS
01-01 00:21:06.710: I/WifiReceiver(5249): android.net.conn.CONNECTIVITY_CHANGE
01-01 00:21:07.230: I/WifiReceiver(5249): android.net.conn.CONNECTIVITY_CHANGE
01-01 00:21:08.120: I/WifiReceiver(5249): android.net.conn.CONNECTIVITY_CHANGE
01-01 00:21:21.820: I/WifiReceiver(5249): android.net.wifi.SCAN_RESULTS
01-01 00:21:21.870: I/WifiReceiver(5249): android.net.wifi.supplicant.STATE_CHANGE
01-01 00:21:22.270: I/WifiReceiver(5249): android.net.wifi.supplicant.STATE_CHANGE
01-01 00:21:22.540: I/WifiReceiver(5249): android.net.wifi.supplicant.STATE_CHANGE
01-01 00:21:28.780: I/WifiReceiver(5249): android.net.wifi.supplicant.STATE_CHANGE
01-01 00:21:28.780: I/WifiReceiver(5249): (验证失败)
01-01 00:21:28.860: I/WifiReceiver(5249): android.net.wifi.supplicant.STATE_CHANGE
01-01 00:21:30.160: I/WifiReceiver(5249): android.net.wifi.SCAN_RESULTS
01-01 00:21:30.200: I/WifiReceiver(5249): android.net.wifi.supplicant.STATE_CHANGE
01-01 00:21:32.240: I/WifiReceiver(5249): android.net.conn.CONNECTIVITY_CHANGE
01-01 00:21:32.760: I/WifiReceiver(5249): android.net.conn.CONNECTIVITY_CHANGE
01-01 00:21:33.680: I/WifiReceiver(5249): android.net.conn.CONNECTIVITY_CHANGE
最后的最后，贴上使用到的权限：
原创博客来自CSDN：http://blog.csdn.net/dreamintheworld/article/details/45064535