android中 获取WiFi信息并计算wifi的信号强度
转于：http://blog.csdn.net/wang1588143/article/details/6653475
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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;
}
}