通知：Notification

    // 创建通知    private void createNotification() {        // 创建通知管理者        manager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);        // 创建builder实例        builder = new Notification.Builder(MainActivity.this);        // 设置小图标        builder.setSmallIcon(R.mipmap.ic_launcher);//        builder.setContentTitle("");//        builder.setContentText("");        // 点击后不会自动消失        builder.setAutoCancel(false);        // 不会滑动删除通知        builder.setOngoing(false);        // 设置优先级        builder.setPriority(Notification.PRIORITY_MAX);        // 通知提示语        builder.setTicker("notification is build!");        // 提示音 震动 闪光 都为系统默认        // builder.setDefaults(Notification.DEFAULT_ALL);        builder.setSound(Uri.parse("android.resource://" + getPackageName() + "/" + R.raw.ring));        builder.setDefaults(Notification.DEFAULT_VIBRATE);        // pendingIntent跳转        Intent intent = new Intent(MainActivity.this, MainActivity.class);        intent.setFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP);        PendingIntent pendingIntent = PendingIntent.getActivity(MainActivity.this, 0, intent, FLAG_UPDATE_CURRENT);        builder.setContentIntent(pendingIntent);        notification = builder.build();        // 发起正在运行事件（活动中）        // notification.flags = Notification.FLAG_ONGOING_EVENT;        // 三色灯提醒        // notification.flags = Notification.FLAG_SHOW_LIGHTS;        // 让声音、振动无限循环，直到用户响应 （取消或者打开）        notification.flags = Notification.FLAG_INSISTENT;        // notification.flags = Notification.FLAG_ONLY_ALERT_ONCE ;        // 只有全部清除时，Notification才会清除        // notification.flags = Notification.FLAG_NO_CLEAR;        // 自定义通知样式        remoteView = new RemoteViews(getPackageName(), R.layout.layout_guard_notification);        remoteView.setTextViewText(R.id.tv_notification_num, sdf.format(System.currentTimeMillis()));        notification.contentView = remoteView;        manager.notify(1990, notification);    }刷新通知：
remoteView.setTextViewText(R.id.tv_notification_num, sdf.format(System.currentTimeMillis()));manager.notify(1990, notification);
取消通知：二选一
manager.cancel(1990);
manager.cancelAll();


DEMO链接