WifiManager

获得WifiManager的实例

private WifiManager mWifiManager = (WifiManager)c.getSystemService(Context.WIFI_SERVICE);

检测Wiif的状态

Wifi的状态值常量

WIFI_STATE_DISABLED = 1; //Wi-Fi is disabled.
WIFI_STATE_DISABLING = 0; //Wi-Fi is currently being disabled
WIFI_STATE_ENABLED = 3; //Wi-Fi is enabled.
WIFI_STATE_ENABLING = 2; //Wi-Fi is currently being enabled.
WIFI_STATE_UNKNOWN = 4; //Wi-Fi is in an unknown state

Wifi状态监测

int state = mWifiManager.isWifiEnabled();

state的值，对应上面的wifi状态常量

连接wifi

打开wifi

mWifiManager.setWifiEnabled(true);

关闭wifi

mWifiManager.setWifiEnabled(false);

Wifi 状态的变化的监听

Wifi状态的变化可以通过广播来监听

private BroadcastReceiver mReceiver = new BroadcastReceiver() {

  @Override
  public void onReceive(Context context, Intent intent) {
      String action = intent.getAction();
      if(action.equals(WifiManager.WIFI_STATE_CHANGED_ACTION)){
          int s = intent.getIntExtra(WifiManager.EXTRA_WIFI_STATE, WifiManager.WIFI_STATE_UNKNOWN);
          //wifi的状态变化会触发这个广播
          //s的值对应上面的wifi状态常量，可以根据不同的状态值来更新界面
      }
  }
};

链接wifi

//netId 可以通过添加一个WifiConfiguration获得
int netId = mWifiManager.addNetwork(config);
boolean b = mWifiManager.enableNetwork(netId, true);

添加WifiConfiguration
//ssid : wifi 的名称，pwd: wifi的密码，type: 加密方式 0:没有加密 1：wep 2： wap

public WifiConfiguration createWifiInfo(String ssid,String pwd,int type){
  log.e("create wifif ssid: "+ssid+" pwd: "+pwd+" type "+type);
  WifiConfiguration cfg = new WifiConfiguration();
  WifiConfiguration tempConfig = this.isExist(ssid);
  if(tempConfig != null) {
      mWifiManger.removeNetwork(tempConfig.networkId);
  }

  cfg.SSID = "\"" + ssid + "\"";
  if( !TextUtils.isEmpty(pwd)) {
      if(type == 0){
          cfg.wepKeys[0] = "";
          cfg.allowedKeyManagement.set(0);
          cfg.wepTxKeyIndex = 0;
      }else if( type == 1 ) {
          cfg.wepKeys[0]   = "\"" + pwd + "\"";
          cfg.wepTxKeyIndex = 0;
      }else {
          cfg.preSharedKey = "\"" + pwd + "\"";
      }
  }

  return cfg;
}

wifi断开连接

mWifiManager.disableNetwork(netId);

删除已经保存的wifi

boolean r = mWifiManager.removeNetwork(netId);

扫描可用的Wifi

Wifi连接之后，可以扫描当前可以使用的wifi

boolean scan = mWifiManager.startScan(); //返回true，说明扫描成功

获取扫描到的wifi列表

List scanResults = mWifiManager.getScanResults();

通过ScanResult可以获得wifi的相关信息

for(ScanResult sr : scanResults){
  String SSID = sr.SSID; //wifi的名称，在设置中显示的名称
  String BSSID = sr.BSSID; //wifi的地址
  String cap = sr.capabilities; //wifi的加密方式
  int freq = sr.frequency ; //wifi的频率
  int level = sr.level; //wifi的强度
}

计算wifi的强度

int level = WifiManager.calculateSignalLevel(sr.level, 5);

获取已经连接的wifi的信息
```
WifiInfo wi = mWifiManger.getConnectionInfo();
```
WifiInfo 的信息如图

这里写图片描述
获取已经配置好的wifi的信息
```
List configs = mWifiManager.getConfiguredNetworks();
```
WifiConfiguration的信息如图

这里写图片描述

这里写图片描述