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In android studio with java How to load web text as string from an activity for Android 6+ devices

From an Activity, How can I retrieve code or text from a website and display to the user ? I'm having difficulties programming back to Android, now developing as for Android 6.0 and newer. Getting deprecated about http client etc.. so I need a little of help.
Can you paste me some code example including "imports" in order to when the app load, from an Activity class, and also when a user click a "button1", to retrieve the text displayed from a web say "yahoo.es", and show a message to the user with the text from the web (loaded and parsed to a string) using Toast.
Help much appreciated in advance

Firstly you are way too ambiguous about your question. Correct me if i am wrong, what you basically want is to get data from internet and display them to user. Right.
If Yes, then the best way to do this is to get JSON response and parse it to display the relevant information onto the screen.
Take for example, you want an App displaying current Weather status of a city.Then to get the Weather data from Internet you need to connect to those websites which provide you that data.
Now one such website is OpenWeatherMap.org. You can use its APIs to retrieve data in JSON format and then display. You need to go through its API documentation.
This is link which will explain you the full process of connecting to an website's API, its retrieval of Data in Json format and ways to render and display them on screen effectively.
https://www.udacity.com/course/android-basics-networking--ud843
Hope it helps.

Facebook new feed API access

I'm currently building an Android app that makes use of the Facebook API. I've gotten to the stage where I want to be able to retrieve a user's Newfeed i.e. the one you see at https://www.facebook.com/home.php. It seems that was possible using the /{user-id}/home endpoint but of course, that's now depreciated and they suggest using /{user-id}/feed but it seems entirely different since the home endpoint states
returns posts a person sees in their News Feed
however the feed endpoint states
links published by this person, or by others on this person's profile
which suggests the user's timeline instead.
Was that the only was of retrieving the newfeed? And is there any new endpoint I can use? I've tried looking already but it seems getting the user's newsfeed is no longer possible, is that correct?

Use feed. It's basically a replacement for home, but yes, it only gets the posts they are tagged in and such that would appear on their timeline.
They removed the functionality you're looking for when they removed home.
Documentation.

Android facebook SDK 4.x getting user email without JSON

I want to ask how could I get user's which is logged into app email as string value? I have only seen tutorials how to get it using json and then send it to web service which I don't need. Maybe someone could show me the simple way of getting user email?

The Graph API always returns JSON. So, no, I don't think that this is possible. The Android SDK provides convenience classes, so I don't really see a big effort using those. You can use JSONObject.get("email") to retrieve to value of the email property I guess.
See
https://developers.facebook.com/docs/android/graph#userdata
http://developer.android.com/reference/org/json/JSONObject.html#get(java.lang.String)

Android changeable database content via internet? (like news apps)

Hello I am beginner to Android development so I want to ask how to create dynamically changeable database (content) in Android?
I'm aware of sqlite shared preferences but how can I interact with them via internet and add new information like news apps? Could Parse help?

This is not a answer, but a comment rather, I don't have the 50 rep required to comment.
It all depends on the sort of functionality you want to achieve. I.e. do you want to be able to push new content to the device using the internet such as push notifications.
OR
Do you want the app to make a http connection to a api or your own news service on startup or on button press for example?
UPDATE
Ok you have decided you want something similar to option 2. I am not going to write code for you but I will point you in the right direction and if you get stuck, post a question.
Please take a look at:-
https://play.google.com/store/apps/details?id=com.rsoftware.news
If you have decided this is what you want or similar, this application uses an API calling infrastructure.
The API they use is called FAROO.
http://www.faroo.com/hp/api/api.html
I suggest reading the documentation, deciding if this is indeed what you want, then sign up and get a API key. Afterall it is free! enjoy coding, enjoy the errors that you will receive and persevere =).
How to make a API call
I suggest when using a API, test the queries through the browser first of all or use something like Runscope for testing their services. So first get their URL which is:-
http://www.faroo.com/api
If we were to go to this url we will get a 401 response code, which means unauthorised. This is because we haven't added our unique API key to the html query. So this url can take parameters. We simply append a ? to the end of the url and supply the parameters that FAROO offers such as:-
q which stands for query (what do you want FAROO to search for?)
start which is the number it should start from
length which is the number of results you want FAROO to return
key which is your unique to make the requests
etc etc...
So an example of a complete url would be:-
http://www.faroo.com/api?q=iphone&start=1&length=10&l=en&src=news&f=json
This url is for demonstration purposes... your own url will have a key=YourAPIKey
Also notice how the parameters are separated by & symbols i.e. q=iphone&start=1 so this part q we know stands for query which is iphone & start=1 & so on.
Hope this helps.

How to get entire news content from a news website

I am planning to make a desktop application which will have 5 regional newspapers and the user can select either of them to read it.
I need seperate colums such as Opinion,Editorial,Breaking News,Sports,etc. which means I need data of their every column.
But when I visited few papers' websites,they are just giving the headline, one line description and a link to read more as xml feed.On clicking the link the user is directed to their website.
I have seen many android applications like news Hunt ,World news,etc , which show the entire content.How do they do it?Are they using any backdoor or hack or something?

Use Jaunt Api .
The Api has easy-to-learn structure and also the code is efficient as well as fast.
You should give it a try.

Try to use a third service like
http://import.io/ or http://www.mozenda.com
As you said apps like Flipboard, Breaking news sport etc are based on services like import.io
With this you can transform information from the web into usable data easily !

Some of this app used JSON in retrieving the content from the web and pass into android app. check this link

They use an API that allows them to retrieve news (load from a server).
For example yahoo, google, etc
Not tested yet but it works (I'm sure) see yahoo API
In your case, You should write another view to display news details according to the news ID: Read their documentation carefully

Some Websites will write their own public API, which everyone can access with some HTTP header values sent. After sending HTTP request, they return the response in XML / JSON formats which you have to parse them inside your Android app and produce them on UI.
If in case they do not provide any API as such, then you need write a server side Crawler which crawls and parses the information(HTML Tagged information) from their websites and store them. Again then you need to write your own Web services(RESTful / SOAP) that send the parsed information to Android app via URL's or something.

This can be achieved using RSS feed.
visit here and see page source, here you can get all news in item tags like this
<item>
<title>..</title>
<description>...</description>
</item>
where each item tag is for each news, you can fetch both title and description from there.
and you can get data from any link using HTTPPOST or HTTPGET mehods