Android O(8.0)Notification Chann

NotificationGroup通知渠道组示意图.png

上面这张图，将具有形同形态，相同表现形式的通知渠道A ，通知渠道B归纳到了同一个渠道组中。

1. 通知渠道的引入可以很方便的管理，和归纳同一种类型的通知Notification.
2. 通知渠道组的引入同样可以方便的管理，归纳同一种类型的通知渠道Channel.

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1.首先看一下Android8.0之前的普通Notification的样式以及使用姿势

普通多个notification.png

1. 可以看到是多个通知 ，无论是不是同一个应用的通知，逐个排列下来，占满了屏幕，不太友好
2. 接下来我们来看一下代码

NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(getApplicationContext(), CHANNEL_ID)
                .setSmallIcon(android.R.drawable.stat_notify_chat)
                .setContentTitle("你有一条新的消息")
                .setContentText("this is normal notification style")
                .setTicker("notification ticker")
                .setPriority(1000)
                .setAutoCancel(true)
                .setVibrate(new long[]{100, 200, 300, 400, 500, 400, 300, 200, 400})
                .setNumber(3)
                .setDefaults(Notification.DEFAULT_SOUND | Notification.DEFAULT_VIBRATE)
                .setContentIntent(pendingResult)
                .setOngoing(true);


        Notification notification = mBuilder.build();
        getNotificationManager().notify(notifyId, notification);

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2.再来看一下带下载进度的通知栏Notification

带下载进度Notification.png

1. 起一个线程来模拟 下载进度，间隔1秒更新一下 通知进度。

 final NotificationManager mNotifyManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
        final NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(this, CHANNEL_ID);
        mBuilder.setContentTitle("Picture Download")
                .setContentText("Download in progress")
                .setOngoing(true)
                .setVibrate(new long[]{0})
                .setSound(null)
                .setTicker("notification ticker")
                .setDefaults(NotificationCompat.FLAG_LOCAL_ONLY)
                .setSmallIcon(android.R.drawable.stat_notify_chat);
        new Thread(
                new Runnable() {
                    @Override
                    public void run() {
                        int incr;
                        for (incr = 0; incr <= 100; incr += 5) {
                            mBuilder.setProgress(100, incr, false);
                            mBuilder.setSound(null);
                            mNotifyManager.notify(0, mBuilder.build());
                            try {
                                Thread.sleep(1000);
                            } catch (InterruptedException e) {
                            }
                        }
                        mBuilder.setContentText("Download complete").setProgress(0, 0, false);
                        mBuilder.setAutoCancel(true);
                        mBuilder.setOngoing(false);
                        mNotifyManager.notify(0, mBuilder.build());
                    }
                }
        ).start();

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3.再来看一下自定义布局的Notification

自定义布局Notification.png

1. 创建一个布局资源，通过RemoteViews来 渲染，同时也绑定了点击事件

  RemoteViews remoteViews = new RemoteViews(getPackageName(), R.layout.remote_custom_notification);
        remoteViews.setTextViewText(R.id.title, "Custom Notification---title");
        remoteViews.setTextViewText(R.id.content, "Custom Notification---content");

        Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
        intent.setType("image/*");
        intent.addCategory(Intent.CATEGORY_OPENABLE);

        PendingIntent pendingIntent = PendingIntent.getActivity(this, REQUEST_CODE_NOTIFY, intent, PendingIntent.FLAG_UPDATE_CURRENT);
        Notification notification = new NotificationCompat.Builder(this, CHANNEL_ID)
                .setSmallIcon(android.R.drawable.stat_notify_chat)
                .setContent(remoteViews)
                .setTicker("ticker")
                .setContentIntent(pendingIntent).build();

        getNotificationManager().notify(notifyId, notification);
  

以上【1】【2】【3】就是常用的通知栏Notification的样式和使用姿势

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4.下面来看一下Android 8.0上通知渠道NotificationChannel 的应用

NotificationChannel.png

1. 上图可以看到，相同通知渠道的通知已经被合并，而不是一一全部展开。
2. 如果你的项目TargetSDK在26以上，那么你在使用Notification的时候必须指定一个ChannelId，否则当然会报错
3. 下面是Android 8.0上通知渠道NotificationChannel 的使用代码段，注意点需要传入CHANNEL_ID（随意指定），CHANNEL_NAME（随意指定）

NotificationChannel channel = new NotificationChannel(CHANNEL_ID, CHANNEL_NAME, NotificationManager.IMPORTANCE_HIGH);
        channel.setBypassDnd(true);    //设置绕过免打扰模式
        channel.canBypassDnd();       //检测是否绕过免打扰模式
        channel.setLockscreenVisibility(Notification.VISIBILITY_SECRET);//设置在锁屏界面上显示这条通知
        channel.setDescription("description of this notification");
        channel.setLightColor(Color.GREEN);
        channel.setName("name of this notification");
        channel.setShowBadge(true);
        channel.setVibrationPattern(new long[]{100, 200, 300, 400, 500, 400, 300, 200, 400});
        channel.enableVibration(true);
        getNotificationManager().createNotificationChannel(channel);

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5.如果要使用通知渠道组NotificationChannelGroup，那么它的样式跟上图一样，使用姿势是下面这样

1. 这里在渠道组NotificationChannelGroup上绑定了两个通知渠道NotificationChannel ，每个渠道下各有一个通知Notification.

getNotificationManager().createNotificationChannelGroup(new NotificationChannelGroup(GROUP_ID, "GROUP_CHANNEL"));

        NotificationChannel channel = new NotificationChannel(CHANNEL_ID, CHANNEL_NAME, NotificationManager.IMPORTANCE_HIGH);
        channel.setGroup(GROUP_ID);
        channel.setShowBadge(true);
        channel.setLightColor(Color.RED);
        channel.enableLights(true);
        getNotificationManager().createNotificationChannel(channel);

        NotificationChannel channel2 = new NotificationChannel(CHANNEL_ID_2, CHANNEL_NAME, NotificationManager.IMPORTANCE_HIGH);
        channel2.setGroup(GROUP_ID);
        channel2.setShowBadge(true);
        channel2.setLightColor(Color.RED);
        channel2.enableLights(true);
        getNotificationManager().createNotificationChannel(channel2);


        Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
        intent.setType("image/*");
        intent.addCategory(Intent.CATEGORY_OPENABLE);
        PendingIntent pendingResult = PendingIntent.getActivity(this, REQUEST_CODE_NOTIFY, intent, PendingIntent.FLAG_UPDATE_CURRENT);

        NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(getApplicationContext(), CHANNEL_ID)
                .setSmallIcon(android.R.drawable.stat_notify_chat)
                .setContentTitle("notification title_9")
                .setContentText("notification content_9")
                .setPriority(1000)
                .setAutoCancel(true)
                .setVibrate(new long[]{100, 200, 300, 400, 500, 400, 300, 200, 400})
                .setNumber(3)
                .setDefaults(Notification.DEFAULT_LIGHTS)
                .setContentIntent(pendingResult)
                .setOngoing(true);

        NotificationCompat.Builder mBuilder1 = new NotificationCompat.Builder(getApplicationContext(), CHANNEL_ID_2)
                .setSmallIcon(android.R.drawable.stat_notify_chat)
                .setContentTitle("notification title_10")
                .setContentText("notification content_10")
                .setPriority(1000)
                .setAutoCancel(true)
                .setVibrate(new long[]{100, 200, 300, 400, 500, 400, 300, 200, 400})
                .setNumber(15)
                .setDefaults(Notification.DEFAULT_SOUND | Notification.DEFAULT_VIBRATE)
                .setContentIntent(pendingResult)
                .setOngoing(true);


        getNotificationManager().notify(9, mBuilder.build());
        getNotificationManager().notify(10, mBuilder1.build());

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6.通知渠道的管理

1.删除渠道

 getNotificationManager().deleteNotificationChannel(CHANNEL_ID);

2.删除渠道组

 getNotificationManager().deleteNotificationChannelGroup(GROUP_ID);

以上便是老版本上使用Notification 和 Android 8.0上通知渠道，渠道组的姿势。

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