Android navigation system/bar square button - android

I do not find on Internet, what is the name of this button ?
And I want to know what is the exact action when an application is deleted like this :
With this action, the application is not really stopped

The Third Image means Square is called Overview button(Recent Button). When Click on That Button the list of application is display which you are work on it. and you can simply remove app from the list by slide app Right to Left.
For more detail visit this : https://android.stackexchange.com/questions/32697/what-is-the-offical-name-of-the-third-on-screen-button

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Xamarin.Android create back button in toolbar with text of previous view

So I want to create a back button on every View I open in my Xamarin Android app. To explain better here is the screenshots, that will help me explain my problem:
Lets assume this is my first view when I open app:
When I click three dots popup menu opens. And for example I select Profile item.
Then this view opens:
Now as you can see at the top I have back button, but the text near the button is hardcoded... How can I make it show me previous view name? In this case it should be "List".
Moreover, I don't know how to implement back button to get back, and I was looking for any kind of tutorial or example, but couldn't find any... could someone please help me?
UPDATE 1
I am using MvvmCross in my application there are some places where I navigate between activities and some places where I navigate between fragments, I thinking about unifying everything and make navigation only between fragments...
For now I didn't made any implementation of back button, I need some help with that

Interactive home screen icons

I searched this topic and couldn't find anything on it.
Is there a way to make interactive icons on the home screen?
for example there is "clean master" that after you click an icon of it, it make an animation. Also there is this facebook thing where you get a message and an icon with the profile picture of the one that messaged you pops up.
I can't figure out or find a way to implement this kind of stuff..
I would be happy if any one could give me some kind of direction..
Thanks in advance.
for example there is "clean master" that after you click an icon of it,
it make an animation.
The icon doesn't animate. When you click on it, a new transparent Activity opens which the icon at the same position where the original icon is. The animations happens entirely on the activity.
The activity is transparent so you get a feel that the icon itself is animating. If you notice carefully, you can find the navigation bar coming up if you tap somewhere while its animating.
Also there is this facebook thing where you get a message and an icon
with the profile picture of the one that messaged you pops up.
It is know as Chat Heads. You ca create your own, but it an take some time and is a bit involving. If you are a beginner and/or you are in a hurry, you can use this library. I have used it and it works perfectly.
The general answer if you want activity on the home screen is to implement a widget.
http://developer.android.com/design/patterns/widgets.html

launching app by swiping on screen(like Switchr app)

I have a news app.It is supposed to launch by swiping on the screen(homescreen or while in any other activity like switchr app).I learned to code swiping patterns but in my case I have to do exactly in the following way(swiping bottom right to top left)..Kindly have a look over following pictorial representation
1.Firstly app should launch by swiping bottom right to top left on the screen
2.next,show the user with list of scrollable arc menu buttons embedded in it like second image
3.when a user clicks on particular button it has to show a brief description about the content like third image
my problems:
creating arc like scrollable menu on bottom right side of the screen(I googled sia ahmed's solution over here ,it helped me a bit)
creating that parachute like structure(image 3) when user clicks particular bubble like button in arc menu..
please guide me
For the menu check out arcmenu by daCapricorn on github. Also see this question.
The balloon bit is trickier. I know of a balloon hint code for android but i haven't seen it in action.
Hope this helps!

Android: Costum laucher to display application in a portion of the screen

I want to create a custom launcher so that, I'll have list of app icons on the right side of the screen, and when the user clicks on an app icon, it'll open the application on the left side of the home screen (this is the part that I still miss).
Is that doable? if so, where should I start? any links or resources of suggestions?
Thanks in advance.

Android:UI design problem

in my app i am trying to get the following designs.
Above is the first image
Above is the second image
When the activity is opened the first image is shown, currently i have shown it as an tab bar but i am not able to place an red colored rounded imageview near the Why? button. According to my app the number in the rounded image view must get changed often.
When the next Why? button is clicked i want to show the UI as in second image with another three buttons over it.
In ios apps, this design can be made by the help of UISegmentControl. In android apps how to implement this.....
This is the nice tutorial about Tab activity and also put badge inside it
see below link
Click Here

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