AndroidアプリからWi-Fiのパスワード設定を変更する

WifiManager wifiManager = (WifiManager) getSystemService(Context.WIFI_SERVICE);
String newPassword = "hogehoge"
WifiConfiguration wifiConf = ...;  // WifiManager#getConfiguredNetworks などから取得する
int networkId = wifiConf.networkId;
wifiConf.preSharedKey = "\"" + newPassword + "\"";
if (networkId == wifiManager.updateNetwork(wifiConf)) {
    // 成功
} else {
    // 失敗
}