android中的通知Notification

1、Notification的作用
   用于通知用户关于APP的一些信息。（例如：推送的聊天消息，升级消息等等）
  2、Notification的用法
   a、
    //创建NotificationBuilder
           //创建PendingIntent
           //将PendingIntent设置到NotificationBuilder中

           //创建Notification
           //创建RemoteViews
           //将RemoteViews设置到Notification的contentView中
           //通过NotificationManager的notify方法，发送通知。
   b、Flags属性：
    a、FLAG_AUTO_CANCEL:用户点击这个消息，这个消息便消失。
    b、FALG_NO_CLEAR：只有全部清空消息时，这个消息才消失。
    c、FLAG_SHOW_LIGHTS：三色灯提示，在使用三色灯时，必须加上该标记。
    d、FLAG_INSISTENT：让声音，震动，无限循环，直到用户操作。或者代码取消。
    e、FLAG_ONLY_ALERT_ONCE：发起通知后，铃声和震动只执行1次。
    f、FLAG_ONGOING_EVENT：发起通知正在运行的事件。

3、默认通知的创建步骤：
1、Notification创建，通过系统服务创建
2、创建Notification Builder
3、创建 Builder
4、创建PendingIntent
5、通过NotificationManager来唤醒提交通知

代码：

  NotificationManager notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);

public void showNotification01(NotificationManager notificationManager) {
        PendingIntent pendingIntent = PendingIntent.getActivity(this, 1000,
                new Intent(this, FromNotificationActivity.class),
                PendingIntent.FLAG_UPDATE_CURRENT);
        //创建Notification.Builder
        Notification.Builder builder = new Notification.Builder(this);
        //配置Builder属性
        //设置通知栏图案
        builder.setSmallIcon(R.mipmap.ic_launcher);
        //设置通知栏缩略内容
        builder.setTicker("XXX发来一条语音消息，请注意查收！");
        builder.setContentTitle("Notification ID: " + ID_NOTIFICATION);
        builder.setContentText("XXX巴拉巴拉说了一堆详细内容");
        builder.setNumber(1);
        builder.setContentIntent(pendingIntent);

        Notification notification = null;

        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
            notification = builder.build();

        } else if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
            notification = builder.getNotification();
        } else {
            Toast.makeText(this, "您的手机太破了，扔了吧！", Toast.LENGTH_SHORT).show();
        }
        notification.flags = Notification.FLAG_NO_CLEAR;
        notificationManager.notify(ID_NOTIFICATION, notification);

    }

2、创建自定义通知：

   public void showNotification02(NotificationManager notificationManager) {
        PendingIntent pendingIntent = PendingIntent.getActivity(this, 1000, 
                new Intent(this, FromNotificationActivity.class), PendingIntent.FLAG_UPDATE_CURRENT);

        Notification.Builder builder = new Notification.Builder(this);
        builder.setSmallIcon(R.drawable.icon);
        //设置通知栏缩略内容
        builder.setTicker("'这是一条自定义通知消息，请查看！");
        builder.setContentTitle("Notification ID: " + ID_NOTIFICATION);
        builder.setContentText("XXX巴拉巴拉说了一堆详细内容");
        builder.setNumber(1);
        builder.setContentIntent(pendingIntent);


        Notification notification = null;
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
            notification = builder.build();

        } else if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
            notification = builder.getNotification();
        } else {
            Toast.makeText(this, "您的手机太破了，扔了吧！", Toast.LENGTH_SHORT).show();
        }
        RemoteViews remoteViews = new RemoteViews(getPackageName(), R.layout.notification_layout);
        remoteViews.setTextViewText(R.id.textview_title, "'英国成功脱欧");
        remoteViews.setTextViewText(R.id.textview_content, "'英国不仅成功脱欧，欧洲杯 英格兰VS冰岛 1:2 ");
        remoteViews.setImageViewResource(R.id.imageview_icon, R.drawable.icon);

        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
            notification.bigContentView = remoteViews;

        } else {
            notification.contentView = remoteViews;
        }

        notification.contentView = remoteViews;
        notification.flags = Notification.FLAG_NO_CLEAR;
        notificationManager.notify(ID_NOTIFICATION, notification);

    }