1、首先要判斷當(dāng)前wifi是否是已經(jīng)保存過的，包括當(dāng)前正在連接的wifi

/**
     * 判斷是否連接過指定的SSID wifi信號
     */
    public WifiConfiguration isExsitsInRecord(String SSID) {

        if (mWifiManager == null)
            return null;

        List<WifiConfiguration> existingConfigs = mWifiManager.getConfiguredNetworks();
        for (WifiConfiguration existingConfig : existingConfigs) {
            if (existingConfig.SSID.equals("\"" + SSID + "\"")) {
                return existingConfig;
            }
        }
        return null;
    }

2、在通過獲取到的networkId，通過removeNetwork忘記密碼

 /**
     * 從已保存過的wifi密碼列表中刪除
     *
     * @param ssid
     * @return
     */
    public boolean forgetSaved(String ssid) {
        WifiConfiguration exsitsInRecord = isExsitsInRecord(ssid);
        int networkId = exsitsInRecord.networkId;
boolean removeNetwork = mWifiManager.removeNetwork(networkId);
        boolean saveConfiguration = false;
        if (removeNetwork) {
            saveConfiguration = mWifiManager.saveConfiguration();
        }
        return saveConfiguration;
    }

此方法好像只在高版本中能正常使用，親測7.1版本可用