android 判断是否有sim卡

/**
 * 判断是否包含SIM卡
 *
 * @return 状态
 */
public static boolean ishasSimCard(Context context) {
    TelephonyManager telMgr = (TelephonyManager)
            context.getSystemService(Context.TELEPHONY_SERVICE);
    int simState = telMgr.getSimState();
    boolean result = true;
    switch (simState) {
case TelephonyManager.SIM_STATE_ABSENT:
            result = false; // 没有SIM卡
            break;
        case TelephonyManager.SIM_STATE_UNKNOWN:
            result = false;
            break;
    }
    Log.d(TAG, result ? "有SIM卡" : "无SIM卡");
    return result;
}