通知Notification（可展开的大布局）使用，适配android8.0

补充修正：

2018-11-07 问题：Notification PendingIntent失效，每个通知都响应第一个PendingIntent
https://blog.csdn.net/u013370255/article/details/83791750

2018-08-16 问题：app版本更新，通知形式显示安装包下载进度
https://blog.csdn.net/u013370255/article/details/81737122

1、调用

Intent intent = new Intent(context, MainActivity.class);
Bundle bundle = new Bundle();
intent.putExtras(bundle);
PendingIntent pi = PendingIntent.getActivity(context, 0, intent, 0);

showNotification(getApplicationContext(),pi,"标题","标题","主要标题","标题",tuiSongMessage);

/**
	 * 生成通知
	 * @param context
	 * @param pi
	 * @param ticker 			标题
	 * @param contentTitle		标题
	 * @param bigContentTitle	主要标题
	 * @param summaryText		标题
	 * @param tuiSongMessage	显示内容（消息体）
	 */
	private void showNotification(Context context,PendingIntent pi,
								  String ticker,String contentTitle,String bigContentTitle,String summaryText,
								  TuiSongResponse tuiSongMessage){
		//android O后必须传入NotificationChannel
		if(android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.O){
			NotificationManager notificationManager = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);

			NotificationCompat.Builder builder = new NotificationCompat.Builder(context,"1");
			setNotification(builder,context,pi,ticker,contentTitle,bigContentTitle,summaryText,tuiSongMessage);
			notificationManager.notify(Constants.NOTIFICATIONID, builder.build());

			//ChannelId为"1",ChannelName为"Channel1"
			NotificationChannel channel = new NotificationChannel("1",
					"Channel1", NotificationManager.IMPORTANCE_DEFAULT);
			channel.enableLights(true); //是否在桌面icon右上角展示小红点
			channel.setLightColor(Color.YELLOW); //小红点颜色
			channel.setShowBadge(false); //是否在久按桌面图标时显示此渠道的通知
			notificationManager.createNotificationChannel(channel);
		}else {
			NotificationCompat.Builder builder = new NotificationCompat.Builder(context,null);
			setNotification(builder,context,pi,ticker,contentTitle,bigContentTitle,summaryText,tuiSongMessage);
			NotificationManagerCompat managerCompat = NotificationManagerCompat.from(context);
			managerCompat.notify(Constants.NOTIFICATIONID, builder.build());
		}
	}

/**
	 * 设置大布局通知参数
	 * @param builder
	 * @param context
	 * @param pi
	 * @param ticker
	 * @param contentTitle
	 * @param bigContentTitle
	 * @param summaryText
	 * @param tuiSongMessage
	 */
	private void setNotification(NotificationCompat.Builder builder,Context context,PendingIntent pi,
								 String ticker,String contentTitle,String bigContentTitle,String summaryText,
								 TuiSongResponse tuiSongMessage){
		builder.setLargeIcon(BitmapFactory.decodeResource(context.getResources(), R.mipmap.logo))
				.setTicker(ticker)
				.setContentTitle(contentTitle)
				.setWhen(System.currentTimeMillis())
				.setContentIntent(pi)
				.setVibrate(new long[]{500, 500, 500, 500, 500, 500})
				.setAutoCancel(true)
				.setDefaults(Notification.DEFAULT_SOUND);

		//大布局通知在4.1以后才能使用，BigTextStyle
		NotificationCompat.BigTextStyle textStyle = null;
		if(android.os.Build.VERSION.SDK_INT > Build.VERSION_CODES.JELLY_BEAN) {
			textStyle = new NotificationCompat.BigTextStyle();
			textStyle.setBigContentTitle(bigContentTitle)
					// 标题
					.setSummaryText(summaryText)
					.bigText(tuiSongMessage.content.content);// 内容
			builder.setStyle(textStyle);
		}
		builder.setContentText(tuiSongMessage.content.content);

		if(SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
			builder.setSmallIcon(R.drawable.logo_alpha);
		} else {
			builder.setSmallIcon(R.mipmap.logo);
		}
	}