import android.telephony.SubscriptionManager;
//使用以下方法
SubscriptionManager subscriptionManager = SubscriptionManager.from(mContext);
int defaultDataSubscriptionId = subscriptionManager.getDefaultDataSubscriptionId();
import android.telephony.SubscriptionManager;
//使用以下方法
SubscriptionManager subscriptionManager = SubscriptionManager.from(mContext);
int defaultDataSubscriptionId = subscriptionManager.getDefaultDataSubscriptionId();