Develop Reference

Dropdown list of buttons

First I want to mention that I am a beginner in android.
Basically I am trying to implement the Microsoft's calculator in android.For now I am implementing only the UI.
Is it possible to make a dropdown list of buttons?
Like in this picture when you select Bitwise a list of buttons appears.Also is it possible Bitwise also to be a button and if not to act like one?

Yes, it is possible.
you must use a custom spinner.
By custom spinner, you can add any layout you like to your spinner; so you can create a layout that has a button.
You can search for Android custom spinner and learn about that.
I will give you an educational link about that.
How to add Custom Spinner in android?

Android Spinner with "Radio Buttons" and Cancel button

I am looking for some guidance on how to develop the following spinner dialog shown below in the screen shot. It is present in your your android phone's Settings->Display-> Font Size option.
I have been able to implement a spinner with a simple CheckedTextView for each row.
But I am looking to develop something more specific as shown below.
I have searched all over the place for custom spinners.. but most of the show me how to add images etc to each item in the dropdown.. but nothing specific like this... where I have to "pre select" an item based on what is already chosen.
Some questions I am grappling with are....
1) Are those simple radio buttons beside a text view?
2) How would I know which item to "set selected" when I open the spinner dialog? Because my code would reside in my adapter, where my spinner would be in my Activity/Fragment.
3) How would I put a cancal button in a spinner dialog which dismisses it?
Thanks.

I had created a custom DialogFragment and inside onCreateDialog i am creating AlertDialog and showing it.
use these as reference links
http://developer.android.com/reference/android/app/DialogFragment.html
http://www.cs.dartmouth.edu/~campbell/cs65/lecture13/lecture13.html

Custom combo box in android?

How can i create a combo box in android like the picture bellow?
I can see only spinners in android. but i want like the picture.
Any one can help me??

Create a custom button, and on click show a popup with a ListView within it.
Also on click make the popup appear below the button.

NewQuickAction3D is a small android library to create QuickAction dialog with Gallery3D app style.
try this
hope help you..

something like dropdown in a android app?

I'm searching for a widget in a android app where the user can select a item from a specific list. it's only possible to select one and the list is defined by the app.
it's like a dropdown. I can't use a simple listView because I need at least 4 of there controls on one page. so what is a good solution?

I think, you are looking for something like Spinners

Spinners is what you are looking for.

You can use Spinner in android for dropdown.or you can use AlertDialog as like that of drodown.For using spinner read this.For using AlertDialog read this

Make custom listview dialog look like standard dialog listview

I have a dialog with a listview, the first dialog is for selecting an item and the second one is when you edit the dialog. The first one uses a standard dialog box with no custom layout but for the second one I had to use a custom layout to get the picture in place (if anyone knows how I can populate a standard multiple choice dialog with an typed arrayadapter and item template let me know :)). The first dialog looks like standard dialog should look like but how can I get the second one to look the same with white background, lines between the items etc and be sure it always looks like the standard one even when that one is changed.
Standard
(source: filedump.net)
Custom
(source: filedump.net)
/Viktor

For the same, you need to use setMultiChoiceItems while creating dialog. I hope this example helps you: Android Multi selection dialogs
And also check this example: Android: Spinner-Like UI for Selecting Multiple Options