android获取wifi信号强度

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转载：http://www.cxybl.com/html/android/20120428/23302.html

android获取wifi信号强度

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();
}
//////////////////////////// wifi 信号变化：
注册 receiver,
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("Rssi", "Registered");
    }
    @Override
    public void onPause() {
        super.onPause();

        unregisterReceiver(rssiReceiver);
        Log.d("Rssi", "Unregistered");
    }