Android之获取wifi信号强度

1.Android获取wifi信号质量：

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();
   }

2.注册 receiver监听wifi 信号变化：

public BroadcastReceiver rssiReceiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {

        }
    };
    @Override
    public void onResume() {
        super.onResume();
        registerReceiver(rssiReceiver, new IntentFilter(WifiManager.RSSI_CHANGED_ACTION));
        
        Log.d("way", "Registered");
    }
    @Override
    public void onPause() {
        super.onPause();
        
        unregisterReceiver(rssiReceiver);
        Log.d("way", "Unregistered");
    }