Android实践 -- Android wifi 设置相关

• 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<ScanResult> 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<WifiConfiguration> configs = mWifiManager.getConfiguredNetworks();
  

WifiConfiguration的信息如图

这里写图片描述

这里写图片描述