转于：
http://yidongkaifa.iteye.com/blog/1780456
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int strength = WifiManager.calculateSignalLevel(info.getRssi(), 5);即信号强度。
获取方法：
private String obtainWifiInfo() {
// Wifi的连接速度及信号强度：
WifiManager wifiManager = (WifiManager) getSystemService(WIFI_SERVICE);
// WifiInfo wifiInfo = wifiManager.getConnectionInfo();
WifiInfo info = wifiManager.getConnectionInfo();
if (info.getBSSID() != null) {
// 链接信号强度
int strength = WifiManager.calculateSignalLevel(info.getRssi(), 5);
// 链接速度
int speed = info.getLinkSpeed();
// 链接速度单位
String units = WifiInfo.LINK_SPEED_UNITS;
// Wifi源名称
String ssid = info.getSSID();
}
return info.toString();
}
//////////////////////////// wifi 信号变化 ：
注册 receiver,
public BroadcastReceiver rssiReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
// TODO Auto-generated method stub
Log.d("Rssi", "RSSI changed");
// wifiInfo.setText(obtainWifiInfo());
}
};
@Override
public void onResume() {
super.onResume();
registerReceiver(rssiReceiver, new IntentFilter(WifiManager.RSSI_CHANGED_ACTION));
Log.d("Rssi", "Registered");
}
@Override
public void onPause() {
super.onPause();
unregisterReceiver(rssiReceiver);
Log.d("Rssi", "Unregistered");
}