判断系统通知是否开启，并跳转到设置界面

package com.gamegou.Kickoff;

import android.annotation.SuppressLint;
import android.app.AppOpsManager;
import android.content.Context;
import android.content.Intent;
import android.content.pm.ApplicationInfo;
import android.net.Uri;
import android.os.Build;
import android.provider.Settings;

import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

public class NotificationsUtils {
    private static final String CHECK_OP_NO_THROW = "checkOpNoThrow";
    private static final String OP_POST_NOTIFICATION = "OP_POST_NOTIFICATION";

    @SuppressLint("NewApi")
    public static boolean isNotificationEnabled(Context context){

        AppOpsManager mAppOps = (AppOpsManager)context.getSystemService(Context.APP_OPS_SERVICE);
        ApplicationInfo appInfo = context.getApplicationInfo();
        String pkg = context.getApplicationContext().getPackageName();
        int uid = appInfo.uid;

        Class appOpsClass = null;
        try {
            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 (ClassNotFoundException e) {
            e.printStackTrace();
        } catch (NoSuchMethodException e) {
            e.printStackTrace();
        } catch (NoSuchFieldException e) {
            e.printStackTrace();
        } catch (InvocationTargetException e) {
            e.printStackTrace();
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        }
        return false;
    }

    public static void goToSet(Context context) {
        Intent intent = new Intent();
        if (Build.VERSION.SDK_INT >= 26) {
            // android 8.0引导
            intent.setAction("android.settings.APP_NOTIFICATION_SETTINGS");
            intent.putExtra("android.provider.extra.APP_PACKAGE", context.getPackageName());
        } else if (Build.VERSION.SDK_INT >= 21) {
            // android 5.0-7.0
            intent.setAction("android.settings.APP_NOTIFICATION_SETTINGS");
            intent.putExtra("app_package", context.getPackageName());
            intent.putExtra("app_uid", context.getApplicationInfo().uid);
        } else {
            // 其他
            intent.setAction("android.settings.APPLICATION_DETAILS_SETTINGS");
            intent.setData(Uri.fromParts("package", context.getPackageName(), null));
        }
        intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        context.startActivity(intent);
    }
}