Android状态栏通知，兼容到Android8.0以上

package com.feng.app.utils;

import android.annotation.SuppressLint;
import android.app.AppOpsManager;
import android.app.Notification;
import android.app.NotificationChannel;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.content.Context;
import android.content.Intent;
import android.graphics.BitmapFactory;
import android.os.Build;
import android.support.v4.app.NotificationCompat;

import com.feng.app.R;
import com.feng.app.activity.MainActivity;
import com.feng.app.database.GlobalSimpleSP;
import com.feng.app.thirdsdk.entity.NotifyMessage;

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

/**
 * Created by danxiang.feng on 2017/11/29.
 */

public class NotificationUtil {

    /**
     * 默认的notification id
     */
    private static final int DEFAULT_NOTIFICATION_ID = 5000;
    /**
     * notification id
     */
    private static int notificationId = DEFAULT_NOTIFICATION_ID;

    /**
     * 获取新的notificationId
     *
     * @return
     */
    public static int getNewNotificationId() {
        notificationId++;
        return notificationId;
    }

    public static void pushNotify(Context context, NotifyMessage notifyMessage) {
        if (context == null || notifyMessage == null) {
            return;
        }

        Intent notificationIntent = new Intent(context, MainActivity.class);
        notificationIntent.putExtra("pushReciveMessage", notifyMessage);
        PendingIntent pendingIntent = PendingIntent.getActivity(context, 9001, notificationIntent, PendingIntent.FLAG_UPDATE_CURRENT);

        notify(context, getNewNotificationId(), notifyMessage, pendingIntent);
    }

    public static void notify(Context context, int notificationId, NotifyMessage notifyMessage, PendingIntent pendingIntent) {
        if (context == null || notifyMessage == null) {
            return;
        }

        int appLogoResId = R.drawable.app_logo;
        String appName = Util.getAppName(context);
        if (Util.isEmpty(notifyMessage.getTitle())) {
            notifyMessage.setTitle(appName);
        }

        NotificationManager notificationManager = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
        Notification notification = null;
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) { //Android 8.0
            String channelId = context.getPackageName();
            NotificationChannel mChannel = new NotificationChannel(channelId, appName, NotificationManager.IMPORTANCE_LOW);
            notificationManager.createNotificationChannel(mChannel);
            Notification.Builder builder = new Notification.Builder(context, channelId)
                    .setSmallIcon(appLogoResId)
                    .setLargeIcon(BitmapFactory.decodeResource(context.getResources(), appLogoResId))
                    .setTicker(notifyMessage.getContent())
                    .setContentTitle(notifyMessage.getTitle())
                    .setContentText(notifyMessage.getContent())
                    .setAutoCancel(true);
            if (pendingIntent != null) {
                builder.setContentIntent(pendingIntent);
            }
            notification = builder.build();
        } else {
            NotificationCompat.Builder builder = new NotificationCompat.Builder(context)
                    .setSmallIcon(appLogoResId)
                    .setLargeIcon(BitmapFactory.decodeResource(context.getResources(), appLogoResId))
                    .setTicker(notifyMessage.getContent())
                    .setContentTitle(notifyMessage.getTitle())
                    .setContentText(notifyMessage.getContent())
                    .setAutoCancel(true);
            if (pendingIntent != null) {
                builder.setContentIntent(pendingIntent);
            }
            notification = builder.build();
        }
        notificationManager.notify(notificationId, notification);
    }

    /**
     * 取消所有的notification
     *
     * @param context
     */
    public static void cancelAll(Context context) {
        if (notificationId != DEFAULT_NOTIFICATION_ID) {
            notificationId = DEFAULT_NOTIFICATION_ID;
            NotificationManager mNotificationManager = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
            mNotificationManager.cancelAll();
        }
    }

    /**
     * 通知的权限校验
     *
     * @param context
     */
    public static void checkNotification(Context context) {
        if (!isNotificationEnabled(context)) {
            if (GlobalSimpleSP.getIsNeedCheckNotification(context)) {
                PermissionUtils.openSystemSetting(context, "当前应用需要消息通知。");
                GlobalSimpleSP.storeNeedCheckNotification(context, false);
            }
        }
    }

    @SuppressLint("NewApi")
    public static boolean isNotificationEnabled(Context context) {
        try {
            Class appOpsClass = Class.forName(AppOpsManager.class.getName());
            Method checkOpNoThrowMethod = appOpsClass.getMethod("checkOpNoThrow", Integer.TYPE, Integer.TYPE, String.class);
            Field opPostNotificationValue = appOpsClass.getDeclaredField("OP_POST_NOTIFICATION");

            AppOpsManager mAppOps = (AppOpsManager) context.getSystemService(Context.APP_OPS_SERVICE);
            int value = (Integer) opPostNotificationValue.get(Integer.class);
            int uid = context.getApplicationInfo().uid;
            String pkg = context.getApplicationContext().getPackageName();

            return ((Integer) checkOpNoThrowMethod.invoke(mAppOps, value, uid, pkg) == AppOpsManager.MODE_ALLOWED);
        } catch (NoClassDefFoundError e) {
            e.printStackTrace();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return true;
    }
}