How to add design tab to palette in Android Studio - android

This is what my palette looks like, I want to know how to add other tabs like design and appCompact.
Thank you


Android custom settings

How to make your own design option?
Something like this:
I just want to make my own design options
Those seem like just custom buttons with custom backgrounds and text on them..
Google android custom themes and android styles.xml

Cannot find ConstraintLayout's properties

I am new in android. I decided to use ConstraintLayout. But i cannot find out how to turn on a view's properties. There isn't any tab in the editor.
I use Android studio 3.0.1.
There isn't any tab in the editor.
there is design tab left to text in xml file
Move to Design tab below and in that drag any textview/widget to the layout
Now, just click on that textview/widget, it will show you all properties than you can change from there no need to change in xml file manually it will reflect there too.

Android Spinner Custom?

I am trying to create a spinner that looks exactly like the one in this android example, but not sure how or if it has to be custom? I cant imaging it would have to be a custom layout since it is shown this way in their example...
I am not concerned with how the list looks, but just the way the spinner looks with the lower corner arrow. that is what I want.
This project is an attempt to backport the holo theme by building it into and Android Library project. You can link that library with your project in order to gain access to the holo theme widgets.
I have never used it but I would think that it contains the spinner widget that you are looking for.

Create grid-style layout for Options Menu in Android 4.0.3

I've just met some troubles in Android 4.0.3 with menu because it displays menu item in a list. But I can't a way to set it displaying in a grid-like layout.
Appreciate help.
My friend, I found the main reason why you couldn't display option menu as grid-style in Android 4.0.3.
Because you used #android:style/Theme.Holo for your application.
Menu of Theme.Holo was set for displaying in list-style.
The solutions are:
1, Try to use another theme such as #android:style/Theme.Wallpaper.NoTitleBar instead of #android:style/Theme.Holo.Wallpaper.NoTitleBar
2, Or if you still want to use Theme.Holo, so try to create a style for menu in values/style.xml. References: see styles in Android Framework. (Sr, I don't have Android framework here, so I can't show you what to do exactly now)
Hope this help!

Android - Change Holo theme default blue color

I would like to customize Holo theme by changing the default blue color to fit my company color.
Is there an easy way to do this?
Or I have to redefine the style of all components with blue parts, such as dialog titles, actionbar bottom line, pushed buttons, pickers, etc.
I cannot add anything more than this link:
Android Holo Colors Generator
The Android Holo Colors Generator allows you to easily create Android
components such as editext or spinner with your own colours for your
Android application. It will generate all necessary nine patch assets
plus associated XML drawables and styles which you can copy straight
into your project. If you have any question, please refer to the FAQ
or report an issue.
As an addition to Waza Be's answer, you might want to use this for styling the Action Bar:
The Android Action Bar Style Generator allows you to easily create a simple, attractive and seamless custom action bar style for your Android application. It will generate all necessary nine patch assets plus associated XML drawables and styles which you can copy straight into your project.
This blog has an excellent tutorial on how to use it properly.