android 通知栏

发送通知栏

  @RequiresApi(api = Build.VERSION_CODES.JELLY_BEAN)
    private void sendNotification() {
        //1、NotificationManager
        NotificationManager manager = (NotificationManager)getSystemService(Context.NOTIFICATION_SERVICE);
        /** 2、Builder->Notification
         *  必要属性有三项
         *  小图标，通过 setSmallIcon() 方法设置
         *  标题，通过 setContentTitle() 方法设置
         *  内容，通过 setContentText() 方法设置*/
        Notification.Builder builder = new Notification.Builder(this);
        builder.setContentInfo("Content info")
                .setContentText("Content text")//设置通知内容
                .setContentTitle("Content title ")//设置通知标题
                .setLargeIcon(BitmapFactory.decodeResource(getResources(),R.mipmap.ic_launcher))
                .setSmallIcon(R.drawable.icon_notify)//不能缺少的一个属性
                .setWhen(System.currentTimeMillis());//设置通知时间，默认为系统发出通知的时间，通常不用设置

        if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.O) {
            NotificationChannel channel = new NotificationChannel("001","my_channel",NotificationManager.IMPORTANCE_DEFAULT);
            channel.enableLights(true); //是否在桌面icon右上角展示小红点
            channel.setLightColor(Color.GREEN); //小红点颜色
            channel.setShowBadge(true); //是否在久按桌面图标时显示此渠道的通知
            manager.createNotificationChannel(channel);
            builder.setChannelId("001");
        }

        Notification n = builder.build();
        //3、manager.notify()
        manager.notify(1001,n);
    }

关闭通知栏

  private void cancelNotification(){
        NotificationManager manager = (NotificationManager)getSystemService(Context.NOTIFICATION_SERVICE);
        manager.cancel(1001);
    }