在Android中实现RTL(从右向左)通知正文和标题的方法如下所示。在NotificationCompat.Builder中使用setStyle()方法设置NotificationCompat.BigTextStyle。同时在NotificationCompat.Builder中调用setPriority()方法设置应用程序在 Android 端的通知优先级。

示例代码：

String notificationBody = "这是通知内容";
String notificationTitle = "这是通知标题";

// 创建一个 Intent，用于启动你的应用程序
Intent intent = new Intent(context, YourActivity.class);
PendingIntent pendingIntent = PendingIntent.getActivity(context, id, intent, PendingIntent.FLAG_UPDATE_CURRENT);

// 创建一个 NotificationCompat.Builder 对象.
NotificationCompat.Builder builder = new NotificationCompat.Builder(context, YOUR_CHANNEL_ID)
       .setSmallIcon(R.drawable.YOUR_ICON)
       .setContentTitle(notificationTitle)
       .setContentText(notificationBody)
       .setPriority(NotificationCompat.PRIORITY_HIGH)
       .setStyle(new NotificationCompat.BigTextStyle()
       .bigText(notificationBody));

builder.setContentIntent(pendingIntent);

// 创建 Notification 并显示
Notification notification = builder.build();
NotificationManagerCompat notificationManager = NotificationManagerCompat.from(context);
notificationManager.notify(id, notification);

上述代码将在通知正文和标题的右侧方向上显示文本。