android中 获取WiFi信息并计算wifi的信号强度

一、首先获得WifiManager

WifiManager wifiManager=(WifiManager) getSystemService(WIFI_SERVICE);

添加权限：<uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>

二、 WifiInfo wifiInfo=wifiManager.getConnectionInfo();//当前wifi连接信息

List<ScanResult> scanResults=wifiManager.getScanResults();//搜索到的设备列表

for (ScanResult scanResult : scanResults) {

tv.append("\n设备名："+scanResult.SSID

+" 信号强度："+scanResult.level+"/n :"+wifiManager.calculateSignalLevel(scanResult.level,4));

}

附WifiManager中计算级别的代码：

/**

* Calculates the level of the signal. This should be used any time a signal

* is being shown.

*

* @param rssi The power of the signal measured in RSSI.

* @param numLevels The number of levels to consider in the calculated

* level.

* @return A level of the signal, given in the range of 0 to numLevels-1

* (both inclusive).

*/

public static int calculateSignalLevel(int rssi, int numLevels) {

if (rssi <= MIN_RSSI) {

return 0;

} else if (rssi >= MAX_RSSI) {

return numLevels - 1;

} else {

int partitionSize = (MAX_RSSI - MIN_RSSI) / (numLevels - 1);

return (rssi - MIN_RSSI) / partitionSize;

}

}