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Is there any way to change a style attribute at run time in android

I want to change the textsize inside a style at run time. Can anyone suggest me how to achieve it. Here is the style "TitleView" in which textsize attribute is defined. I want to change it from 20sp to any other value at run time.
<style name="TitleView">
<item name="android:textSize">20sp</item>
</style>
I want to do it because I've 4 types of textview with different textsize. and In my app user can choose the textsize. So I've changed the text size of other view in relative to the user entered textsize.
Thanks in advance.

You cannot change style attribute at run time.
If you are just trying to change the text size just do:
textView.setTextSize(TypedValue.COMPLEX_UNIT_SP, 20);
this will change your text size and you can do this at any time you want. It is not necessary to change your style attribute. For setting text size at runtime see this

Edit: The poster has altered the original question. This answer is no longer directly applicable.
This cannot be done. The styles along with all the other resource values are all compiled into R.java at compile time.
Instead you could you create two styles and switch the style at runtime using setTextAppearance

TextView with custom font isn't centered vertically

I need to use a custom font (VAG Rounded, probably not relevant) but the font changes how my TextViews react.
In the image below, you can see the two textviews with a black background. The left one use the custom font, the right one the default system font (Roboto ?). Both of them have the same xml properties and size, but the padding is not the same and more important, the left one isn't centered vartically !
How can I make the TextView draw its content well centered ?

You can try to remove your customs font padding from your text style (styles.xml):
<item name="android:includeFontPadding">false</item>
If this still doesn't work, i would set a general padding in your styles xml.

I think that you have to set android:layout_height="match_parent" and then also android:gravity="center"
then if you post also your source code we can give you more information

I could not change the font, and I wasn't going to edit each character using an editor (I don't even know what I should have done to fix it).
Si I ended up measure the difference with the default font and I added 0.15f * fontSize in the padding top...

How to add style to a NumberPicker in Android

I am trying to add a custom style to an Android NumberPicker. What I am trying to do is have the text displayed by the picker as white since by default (or according to the default theme on the device) I have it in black. The problem is that my app background is a dark color so I want the text to be white or something clear.
so I have something like this in my style.xml file :
<style name="myPicker">
<item name="android:textColor">#FFFFFF</item>
</style>
the textcolor attribute doesn't even exist on the NumberPicker widget but I just tried to add it so that my text color changes. It does not work of course. The only thing that can be customized on this widget seems to be the background
Now the question : how can we change the text color of the picker ?
if somebody has the same issue or has solved it then please let us know.

I have found an "ugly" way to do it. Just get a reference to the child views of the number picker widget. There are three (3) child views : the upper arrow, the textview (containing the text or value to be displayed) and the lower arrow.
Let's say we have a Number picker called np
np.setValue(10);
np.setMinValue(5);
np.setMaxValue(50);
// retrieve the textview reference
TextView npTextView = (TextView) np.giftAmount.getChildAt(1); // since indexing begins at 0
npTextView.setTextColor(getResources().getColor(
R.color.my_custom_color)
I know that's bad but it works ...

Android: How to set bold / bigger outline on a Edittext

I have a EditText on my View and i would like to set his outline on bold or bigger than she is.
Is it possible with xml?
Thank you.

I don't think you can just modify the thinkness of the borderlines of an EditText. However, you could accomplish something similar with ninepatch.

Apply the Android "Dialog" theme and sizing it properly

I have an activity that I would like to occur in a dialog. Is there anyway to do this from code, instead of in the manifest? I tried to do this, but it seemed to have no effect.
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setTheme(R.style.Theme_Dialog);
}
Also, the activity contains a webview and when it starts out as a dialog it's got a small amount of content and the dialog is only like 100px tall. When content fills in it scrolls inside a tiny 100px tall window in the dialog. How do I make the dialog take up more vertical space?

You can easily accomplish this via XML. Just use an XML named 'themes.xml', and place it in the values folder.
Here's a basic example, which implements a custom background:
<resources>
<style name="my_theme" parent="#android:style/Theme.Dialog">
<item name="android:windowBackground">#drawable/custom_background</item>
</style>
</resources>
You'll also need to add the following line to the desired activity section of the manifest:
android:theme="#style/my_theme"
PS: I realize this is an old thread, but hopefully it helps someone nonetheless :)

I'm not aware of a way to set the dialog theme from code.
The dialog is basically as big as it needs to be to contain the content, so if you want it to be bigger you need to make some component in your view larger. Perhaps you can set the hieght of the webview to something larger. Note, use dpi, not px!

that's the solution, you can apply a theme via code, thanks to this guy :)
wasn't aware of this constructor myself
https://stackoverflow.com/a/1975508/371749