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Another activity comes up and covers half the screen size

I have a button which on clicking opens another activity which comes up from below and covers half the screen. I searched about it but did not get any useful approach except the overridePendingTransition function which is useful in getting the animation on activity transition, but this didn't solve my problem. I know this is done in google hangout as shown in the images but can't find any useful solution.
When we press the button this activity comes up and covers half the screen size
when we scroll up the activity becomes our main activity
Any idea how this can be done?
Thanks

you can use bottom sheet for this type of UI.
here is first sample.
another sample
here is code

After some searching i got exactly what i wanted with all the codes, but still the profile picture animation is remaining, rest the SlidingPanelLayout code can be seen here . It contains some detailed information with all the classes implemented which you can use directly. I think this will surely help you. :D
Edit: As said by #MrsEd i would like to add some code that helped me. This is the custom built DraggableLayout which you can use directly, the code can be found here. Then the activity must implement the onStopVerticalDragDown() of the DraggableLayoutCallbackListener inteface and set the content view as this xml file.
Hope this clears all the doubt and makes it easier for anyone to implement their own custom built DraggableLayout without using any third party library. :D

Please. Don't redo this.
And instead, use Flipboard's BottomSheet.

Android: how to make an image viewer with ListView at bottom

I have received a requirement make an image viewer with the listview at bottom like this video https://www.youtube.com/watch?v=aC4OFRxk988 but I don't know the name of that controller to research. Please help me. Thanks

I think viewpager and listview.
and dynamic scale image view are setmatrix.
simply reply. i can't add comment at your post....
if want more hint reply me.

https://github.com/ksoichiro/Android-ObservableScrollView
You can find here some custom implementations.
Test the demo app from the play store and check which one has the closest functionality to the one you desire. Then take a deep breath and try to understand how it's done.

How to give animation to layouts in single activity?

I have one single activity, within which I've combined severel layouts.
The thing i want to achieve is that,
when I'll open activity, the layout should come one after another from the botton and take there position below the above one.
(Like in windows 8)
How should i achieve this??
Please guide me.
Thanks you

Did you check the Google animation Guide?
General information about animation
https://developer.android.com/preview/material/animations.html
Sample app with layout animation within an activity
http://developer.android.com/shareables/training/Animations.zip
I hope this helps. Good luck ;)

Custom pop up or spinner for android

i found a design in IOS that i really like but i cant figure out how to do it in android i have tried doing a custom spinner and am having a hard time with it and i thought of using a pop up but i need to be able to put clickable button in the pop up, so i think a spinner is my best change. I am going to post a picture of what i am trying to accomplish, specifically on the little half box on the top of the drop down! Thanks would really Appreciate some help thanks!!!! ![enter image description here][1] Also i have seen this in Android as well so i know it can be done. http://i.imgur.com/L1ftrSU.png

It's action you showed in your image is called QuickAction, there are many tutorials on how to create one:
Try the NewQuickAction lib, it has a number of modes, and one of them will give you exactly the same layout as your sample image. Here's a quick tutorial for using the library. Have used this lib for 2 years and worked quite well.
This tutorial offers another method to accomplish the same thing, worth checking out as well.

You can use OptionMenu. Refer to this link!

Small Popup for Instructions, like foursquare ones

After seeing the last screenshots of new foursquare application and their balloon like cartoon instructions, I'd like to create some of these in my application.
I found a similar question for iPhone
Small popup for instructions... How?
Here is another screenshot of foursquare app:
I'd like to know how I could achieve that with Android.
Thanks in advance for any help.
UPDATE: This is what I could get so far but adding some buttons with a custom drawn background and layering them with a FrameLayout:
But I still couldn't get the triangle effect. Maybe there is something I can do with my custom background shape?
UPDATE2
After checking your suggestions, I decided to go with Aaron C idea and added an image with an arrow on it. This is my current result:
Thank you Snailer, QuickAction API project seems very much promissing. I'll check it out when implementing more features in my app.
Now, I just need to get the right color or maybe I could just let it this way. It seems nice too.
And, so, to summarize what I did:
Got my initial xml layout inside a FrameView.
As I'm using a frameview, everything I put in here will be piled one over the other. That's how I could add things to the layout.
In that framelayout, I put 2 relativelayouts whith an image with the triangle and a button to create the two upper popups. In the bottom I put a button only.
That's it. I hope it helps somebody.
Thank you very much again for all your help!

That sounds like a neat thing to implement. There might be a built-in Android variation on AlertDialog that achieves this, but if not here is how I would go about implementing it:
Create a new Activity whose background is black with a very high (low?) alpha color value. This will allow you to see through it to the previous Activity in the stack. Then, add your alert at whatever coordinates you like using a relative layout with padding values.
You might also want to add a touch listener that exits the Activity if the user touches the balloon (or maybe anywhere in the screen).
If you want to be fancy with coordinate placement of the balloon, you can pass this information into the new Activity using the Activity's launch Intent with the putExtra() methods.

It's probably achieved through skinning a toast.
The developer documentation shows a skinned toast in "Creating a custom toast view" at http://developer.android.com/guide/topics/ui/notifiers/toasts.html

You may want to look at the QuickAction API. It acheives this by using PopupWindow, skinned, positioned, and animated.