在app開發(fā)過程中需要獲取通知欄開關(guān)的狀態(tài)
1.針對8.0之前設(shè)備恢总，通過AppOpsManager的checkOpNoThrow方法獲取。

 public static boolean isEnableV19(Context context, String pkg, int uid) {
        try {
            String CHECK_OP_NO_THROW = "checkOpNoThrow";
            String OP_POST_NOTIFICATION = "OP_POST_NOTIFICATION";
            Class appOpsClass = null;
            AppOpsManager mAppOps = null;
            mAppOps = (AppOpsManager) context.getSystemService(Context.APP_OPS_SERVICE);
            appOpsClass = Class.forName(AppOpsManager.class.getName());
            Method checkOpNoThrowMethod = appOpsClass.getMethod(CHECK_OP_NO_THROW, Integer.TYPE,
                    Integer.TYPE, String.class);
            Field opPostNotificationValue = appOpsClass.getDeclaredField(OP_POST_NOTIFICATION);

            int value = (Integer) opPostNotificationValue.get(Integer.class);
            return ((Integer) checkOpNoThrowMethod.invoke(mAppOps, value, uid, pkg) ==
                    AppOpsManager.MODE_ALLOWED);
        } catch (Exception e) {
            return true;
        }
    }

2.針對8.0及以上設(shè)備洒嗤，發(fā)現(xiàn)上述方式不生效逗余。查詢系統(tǒng)設(shè)置源碼呼巴，在NotificationBackend類中發(fā)現(xiàn)獲取通知欄狀態(tài)改到INotificationManager中了

    public boolean getNotificationsBanned(String pkg, int uid) {
       try {
            final boolean enabled = sINM.areNotificationsEnabledForPackage(pkg, uid);
            return !enabled;
       } catch (Exception e) {
            Log.w(TAG, "Error calling NoMan", e);
            return false;
        }
    }

提供給APP適用的的NotificationManager 類中有INotificationManager 對象茁肠，最終我們通過反射獲取通知欄開關(guān)

    public static boolean isEnableV26(Context context, String pkg, int uid) {
        try {
            NotificationManager notificationManager = (NotificationManager)
                    context.getSystemService(Context.NOTIFICATION_SERVICE);
            Method sServiceField = notificationManager.getClass().getDeclaredMethod("getService");
            sServiceField.setAccessible(true);
            Object sService = sServiceField.invoke(notificationManager);

            Method method = sService.getClass().getDeclaredMethod("areNotificationsEnabledForPackage"
                    , String.class, Integer.TYPE);
            method.setAccessible(true);
            return (boolean) method.invoke(sService, pkg, uid);
        } catch (Exception e) {
            return true;
        }
    }