如何反射SubscriptionManager和TelephonyManager获取其方法

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        mTelephonyManager = (TelephonyManager) context.getSystemService(Context.TELEPHONY_SERVICE);        if (mTelephonyManager == null) {            throw new Error("telephony manager is null");        }               mSubscriptionManager = SubscriptionManager.from(mContext);

举个栗子，获取SubscriptionManagergetSubId(slotId) 和TelephonyManager 的getSimSerialNumber（int subId）

    private static int[] getSubId(int slotId) {        Method declaredMethod;        int[] subArr = null;        try {            declaredMethod = Class.forName("android.telephony.SubscriptionManager").getDeclaredMethod("getSubId", new Class[]{Integer.TYPE});            declaredMethod.setAccessible(true);            subArr = (int[]) declaredMethod.invoke(mSubscriptionManager, slotId);        } catch (ClassNotFoundException e) {            e.printStackTrace();            declaredMethod = null;        } catch (IllegalArgumentException e2) {            e2.printStackTrace();            declaredMethod = null;        } catch (NoSuchMethodException e3) {            e3.printStackTrace();            declaredMethod = null;        } catch (ClassCastException e4) {            e4.printStackTrace();            declaredMethod = null;        } catch (IllegalAccessException e5) {            e5.printStackTrace();            declaredMethod = null;        } catch (InvocationTargetException e6) {            e6.printStackTrace();            declaredMethod = null;        }        if (declaredMethod == null) {            subArr = null;        }        MLog.d("getSubId = " + subArr[0]);        return subArr;    }    private String getSimSerialNumber(int subId) {        Method method;        String status = null;        try {            method = mTelephonyManager.getClass().getMethod("getSimSerialNumber", int.class);            method.setAccessible(true);            status = String.valueOf(method.invoke(mTelephonyManager, subId));        } catch (NoSuchMethodException e) {            e.printStackTrace();        } catch (IllegalAccessException e) {            e.printStackTrace();        } catch (IllegalArgumentException e) {            e.printStackTrace();        } catch (InvocationTargetException e) {            e.printStackTrace();        }        MLog.d("getSimSerialNumber = " + status);        return status;    }

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