Phone.java 文件源码

/**
 * Retrieves network operator names from subscription manager.
 * NOTE: Requires SDK level 22 or above
 *
 * @param context
 * @return
 */
private static String getNetworkOperators(Context context) {
    String operator = "";

    if (!PermissionsUtils.checkPermission(context, Manifest.permission.READ_PHONE_STATE)) {
        return operator;
    }

    if (Build.VERSION.SDK_INT > Build.VERSION_CODES.LOLLIPOP_MR1) {
        SubscriptionManager subscriptionManager = SubscriptionManager.from(context);
        if (subscriptionManager != null) {
            List<SubscriptionInfo> subscriptions = subscriptionManager.getActiveSubscriptionInfoList();
            if (subscriptions != null) {
                for (SubscriptionInfo info : subscriptions) {
                    CharSequence carrierName = info.getCarrierName();
                    if (carrierName != null && carrierName.length() > 0) {
                        operator += carrierName + ";";
                    }
                }
                // Remove last delimiter
                if (operator.length() >= 1) {
                    operator = operator.substring(0, operator.length() - 1);
                }
            }
        }
    }
    return operator;
}