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How to update content of the activity without creating new Activity?

I'm trying to make an app and I have made a blueprint for a specific activity, but I don't know how to implement it. The layout contains few buttons at the top of the activity, and each button features some information, which is displayed inside the view. The view which needs to be updated is present under the buttons. I don't want the activity to be changed, instead it should update the contents of the View, which is different for each category/button.
By doing some research I have realised that the "Tab Layout" can be used to achieve my requirements, but I don't want the tabs and I need some stylish buttons as a replacement.
I know I'm not the best at describing, so I have looked upon Dribble and found one design which is 100% similar to blueprint.
I want to achieve this using XML and Java using Android Studio! Every suggestion will be a great support foy my app.
Thanks a lot.

As far as I know, you could achieve that by using fragments (which is the same concept you would have used on TabLayout). I don't really know how much knowleadge you have on Android, but if you know what a Fragment is, it should be easy for you to recreate the idea.
You have 3 buttons for 3 different fragments, so you must design every fragment by separate and change it depending the button you click.

Change fragment content when page changed, ViewPager

I have a ViewPager, that i'm populating with fragments which has a listview inside. The point is that i have to show a really big amount of data, and i need to make pages, so i only request littel amounts of data.
My problem is that i need to call an asynctask to retrieve the data when the page is changed, and fill the listview of this page, how can i do this? How can i change that listview in the onPostExecute of the task?
PS: i have used an eclipse template for tabs + swipe activity, so im not posting my code.

I'm not sure I got your problem right, but the first thing that comes to my mind, is that I would use an AsyncTaskLoader instead of a simple AsyncTask. From my (limited) experience, loaders solve a lot of problems when it comes to Fragment/Activity lifecycle/configuration changes.
Loaders guide (Android Developers)
No matter what method you are using to get the data, changing the content of the list view in page B after loading the data in page A shouldn't be much of a problem: you have plenty of options, from simply saving the data for page B in the Activity (then changing the page with setCurrentItem and intercepting the page change event with setOnPageChangeListener),
to a more elegant approach employing a SQLite database (which btw would allow you to do some caching on the results, if possible).
Oh, and let's not forget that, if you are using an implementation of the abstract class FragmentPagerAdapter you can probably pass the data directly from one page to the other, as this PagerAdapter implementation
represents each page as a Fragment that is persistently kept in the fragment manager as long as the user can return to the page.
(just use getItem(int) to get a reference to the page you need. I never tried this myself, though).
Hope this helps
EDIT I just found out that getting a reference to the current Fragment shown in the ViewPager is tricky if you are not using a FragmentPagerAdapter: if this was the root of your problem, information about how it can be done can be found here:
Update data in ListFragment as part of ViewPager
Retrieve a Fragment from a ViewPager
Communication between ViewPager and current Fragment

Parsing RSS XML feed into a listview

Getting straight to the point, I'm new to this and trying to use this https://github.com/matshofman/Android-RSS-Reader-Library library to parse an rss feed and put all that into a listview. (I don't mind if you give me an alternate solution to this though. I picked this simply because it looked like it would be easier to understand and less work....)
MY problem is that I'm not sure how to do it, and when I read up on it on google it's either darn confusing or Eclipse says there's something wrong with it and gives me an error.
So :: can someone please explain to me, how I should go about doing this. I understand how to put a URL into this feed, and generally how listviews work,
but I'm getting stumped on passing the data that the library extracts from the feed and passing it into my listview. I don't have a clue how to write out java code that tells it to take data that this library passed and say, put it into this string.
I'm also confused about how a listadapter / adapter works. I think I understand how to write it, but all my past attempts have given me errors and I'm not sure what's the problem there.
It would also be nice if someone could explain how the list_layout thing works out. By that, I mean when you create a new xml file and define how one row of the listview looks, but I don't see how it gets linked up with the main xml file with a single listview.
Thanks for helping me out - it's a school project....
(btw, please be simple with the explanations. I think the main problem i'm having is that a lot of the tutorials like using very technical language, and it ends up not getting the point across to me. Even if you give me a chunk of code, and tell me all that parses my url, that's all i need.)

A ListView needs an Adapter to know what the data is and how much of the data there is. The ListView asks the adapter for a view to display a single item using the adapter's method getView(....). In this method you should inflate your view (the item) using the getLayoutInflater().inflate(..). You then get a view for which you can get the specific sub-views by using the findViewById(...) method on that view. Of each sub-view you set the value of a part of your item.
In order to avoid having to inflate a view for each and every item the ListView recycles item views whenever possible, therefore the method getView(...) receives a view, if that view is not null you can use that view instead of inflating a new view.
While reading your data, or when you have read all your data, you need to tell the adapter that the data has changed, which then tells your ListView that it needs to redisplay data. You tell your adapter by calling notifyDataSetChanged().
There is a Google I/O session on the ListView, maybe that might be interesting to watch: http://www.google.com/intl/nl/events/io/2010/sessions/world-of-listview-android.html

In you android-sdk under /samples/android-xx/ there is a sample called "XmlAdapter" which contains a RSS-feed activity. Could be a helpful alternative.

View different images depending on what item in my list view I click

I'm fairly new to Android programming and I've got this project I need to finish and I'm currently stuck.
I've got a standard listview in a Menu class with an array containing around 20 different elements. So what I want to do is load images in an imageview depending on which item in the listview I click, and since I'm a beginner the only idea I had was to make a new activity for each imageview which seems like a pretty bad way to do it since I'd need about 20-30 new activities..
To sum things up what I want is:
Code for making ONE activity that will display a different image depending on which item in the listview I click, probably pretty basic coding I want as simple solution as possible.
If possible I'm also looking for a solution that includes an SQLite database that stores the URL of an image and then display it in a single activity, also depending on which item I press in my current listview.
(I hope you understand my needs, and if you need I can also post my current code for the Menu class if it helps you help me) Or you can just show me a different way to make this work, I appreciate every answer! Thanks in advance!
NOTE
And please keep in mind, I'm a noob at Java and Android so keep it rather simple or at least explain what you do.

When you click on a list item, display the image in another view in the same layout, unless you want the image to take up the entire screen real estate. If you want it in the entire screen, go to a new Activity by sending the activity an Intent.
Activities are the "controller" of your application. They interact with the visible UI and the input from the user. You don't need a separate activity for each image, just an activity that's associated with a "place" in the UI (an ImageView) where you'll display the image.
I'd start by adding the images as resources under res/drawable before going on to databases.
You are going to have to do most of this yourself. There really isn't any substitute for taking the time to learn Java and Android. There are several tutorials and Android University classes under the Resources tab in the Developers Guide; I suggest you do all of them.

Android autocomplete suggests from internet

I have to implement an EditText search field that, when the User is typing, it fetches suggestions from the internet and shows them in a drop-down menu.
I have read some doc stuff, and I've seen that there is AutoCompleteTextView class that realizes just this function, after setting a generic ArrayAdapter.
But in all the examples I've seen, the ArrayAdapter was filled with a static String array.
So I was thinking:
Is it simpler to use an EditText box and handle all the UI stuff on my own, or to use AutoCompleteTextView with an Adapter? In that case, will it correctly handle the changes of the suggestions array?

I would suggest to go ahead and use the autocomplete with Adapter option. You can easily do what you want by first taking the response from the net and then using it in a handler for onTextChanged. Implementing from scratch the GUI with edittext would be cubersome as well as time-consuming !!