在Android双卡手机上，如何检测哪张SIM卡开启了数据？

Question

我在写一个网络监控应用。我想要检测双卡手机中哪一张SIM卡开启了数据？

我已经为两张SIM卡尝试了TelephonyManager.isDataEnabled()方法。但是该方法返回两个SIMs的enabled。相反，我应该对一张SIM卡启用，而对另一张禁用。

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP_MR1) {

    SubscriptionManager subManager = (SubscriptionManager) context.getSystemService(Context.TELEPHONY_SUBSCRIPTION_SERVICE);
    List<SubscriptionInfo> subscriptionInfoList = subManager.getActiveSubscriptionInfoList();

    TelephonyManager telephonyManager = (TelephonyManager) context.getSystemService(Context.TELEPHONY_SERVICE);
    if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.O) {
        TelephonyManager mgr = telephonyManager.createForSubscriptionId(subscriptionInfoList.get(0).getSubscriptionId());
            int isDataEnabledSIM1 = mgr.isDataEnabled()?1:0;

            mgr = telephonyManager.createForSubscriptionId(subscriptionInfoList.get(1).getSubscriptionId());
            int isDataEnabledSIM2 = mgr.isDataEnabled()?1:0;

            Log.d(TAG, "isDataEnabledSIM1: "+isDataEnabledSIM1 + ", isDataEnabledSIM2="+isDataEnabledSIM2);
    }
}

isDataEnabledSIM1和isDataEnabledSIM2的返回值均为1，表示在两个SIMs上都启用了数据。这显然是不正确的，我只希望一张SIM卡为1，另一张SIM卡为0。

Answer 1

可以在SubscriptionManager中使用getDefaultDataSubscriptionId() (对于N和更高版本)，在N下可以使用反射。示例：

public static int getDefaultDataSubscriptionId(Context context) {
    SubscriptionManager subscriptionManager = null;
    if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.LOLLIPOP_MR1) {
        subscriptionManager = (SubscriptionManager) context.getSystemService(Context.TELEPHONY_SUBSCRIPTION_SERVICE);
    }
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
        int nDataSubscriptionId = SubscriptionManager.getDefaultDataSubscriptionId();

        if (nDataSubscriptionId != SubscriptionManager.INVALID_SUBSCRIPTION_ID) {
            return (nDataSubscriptionId);
        }
    }

    try {
        Class<?> subscriptionClass = Class.forName(subscriptionManager.getClass().getName());
        try {
            Method getDefaultDataSubscriptionId = subscriptionClass.getMethod("getDefaultDataSubId");

            try {
                return ((int) getDefaultDataSubscriptionId.invoke(subscriptionManager));
            } catch (IllegalAccessException e) {
                return ERROR_CODE_EXCEPTION_HANDLED;
            } catch (InvocationTargetException e) {
                return ERROR_CODE_EXCEPTION_HANDLED;
            }
        } catch (NoSuchMethodException e) {
            return ERROR_CODE_NO_SUCH_METHOD;
        }
    } catch (ClassNotFoundException e) {
        return ERROR_CODE_EXCEPTION_HANDLED;
    }
}