How easy to make such presentation or tutorial applications for Android phone without any code?

You may interesting to have a look to an Android Application maker: App Inventor of Google Labs.

Of course, App Inventor may can do more than just simple application for you, so let’s check it out!

Via the official website, App Inventor is:

App Inventor lets you develop applications for Android phones using a web browser and either a connected phone or emulator. The App Inventor servers store your work and help you keep track of your projects.

 

You can start your simple application as following:

• Install AppInventor into your PC: http://appinventor.googlelabs.com/learn/setup/
  • Better use default location, do not change the install folder
• Create new project when you are ready from the web application: http://appinventor.googlelabs.com, gmail account requires
• You build apps by selecting components (ingredients) and then telling them what to do and when to do it.
• You use the Designer to select components. Some components are visible and some aren’t.
• You can add media (sounds and images) to apps by uploading them from your computer.
• You use the Blocks Editor to assemble blocks that define the components’ behavior
• when … do … blocks define event handlers, that tell components what to dowhen something happens.
• call … blocks tell components to do things.

 

Check my quick sample application: KhmerSmiling, download to install here