它有一条旧帖子，但这可能对某人有帮助...

its an old post but this might help someone...

WifiManager wifiManager = (WifiManager) context.getSystemService(Context.WIFI_SERVICE);
int numberOfLevels = 5;
WifiInfo wifiInfo = wifiManager.getConnectionInfo();
int level = WifiManager.calculateSignalLevel(wifiInfo.getRssi(), numberOfLevels);

文档:公共静态int computeSignalLevel(int rssi， int numLevels)