Develop Reference

How to specify the progressBarStyleHorizontal attribute in a style sheet

I want put the progressBarStyleHorizontal attribute in a style sheet.
I have tried something this, but it didn't work.
<style name="BarraProgreso">
<item name="android:progressDrawable">#android:style/Widget.ProgressBar.Horizontal</item>
<item name="android:layout_width">match_parent</item>
<item name="android:layout_height">wrap_content</item>
<item name="android:padding">7dp</item>
<item name="android:indeterminate">true</item>
</style>
Do you know how could use this attribute within a style sheet?
Thanks in advance.

Well, nitzanj was right the problem is the style. Maybe this is what you want:
<style name="BarraProgreso" parent="#android:style/Widget.Holo.Light.ProgressBar.Horizontal">
<item name="android:layout_width">match_parent</item>
<item name="android:layout_height">wrap_content</item>
<item name="android:padding">7dp</item>
<item name="android:indeterminate">true</item>
</style>
Where using the Holo.Light theme gives the following result:
And this is how you can use your new created style :
<ProgressBar
android:id="#+id/yourIDProgressBar"
style="#style/BarraProgreso" />
Hope this helps :)

The easiest solution would be to make your custom progress bar style extend the required style like so:
<style name="BarraProgreso" parent="#android:style/Widget.ProgressBar.Horizontal">
<item name="android:layout_width">match_parent</item>
<item name="android:layout_height">wrap_content</item>
<item name="android:padding">7dp</item>
<item name="android:indeterminate">true</item>
</style>
Note that reason what you tried doesn't work is because you're trying to assign a style value into a drawable, which is impossible. By extending the original style you get all it's attributes while still being able to override any attribute, in case the parent style isn't 100% what you need.

Overwrite only changed style properties for Android fragmentation

I define the followiung style in values/styles.xml of my application:
<style name="light_textview_style">
<item name="android:layout_width">fill_parent</item>
<item name="android:layout_height">wrap_content</item>
<item name="android:layout_marginTop">#dimen/_1_BU</item>
<item name="android:textColor">#color/login_text</item>
<item name="android:textSize">#dimen/text_1_and_quarter_BU</item>
</style>
And in my values-xlarge/styles.xml I modify it the following way:
<style name="light_textview_style">
<item name="android:layout_width">wrap_content</item>
<item name="android:layout_height">wrap_content</item>
<item name="android:layout_marginTop">#dimen/_1_BU</item>
<item name="android:textColor">#color/login_text</item>
<item name="android:textSize">#dimen/text_1_and_quarter_BU</item>
</style>
Basically changing only one property - layout_width becomes wrap content for large displays.
I have many such cases of styles. This means that I duplicate a huge number of properties between styles because of fragmenting just few properties.
Is there any cleverer way to reuse the declaration from values/styles.xml and specify explicitly only the changed properties?

You can have the parent style and derive two different styles from it.
Look at this link about: themes

Want to overload Button style

I want to overload how an android Button looks, except I want to overload only one attribute i.e. the android:background. I know I could write something like:
<style name="App_TextButtonStyle" parent="???">
<item name="android:background">#drawable/filled_roundededges_nostroke</item>
</style>
Where parent="???" specifies which style I inherit from. My question is which style should I inherit from do that I get everything from the android default style for buttons and just define a new background.

I have used style for buttons without specifying "parent" attribute
<style name="BigButtonStyle">
<item name="android:layout_width">wrap_content</item>
<item name="android:layout_height">wrap_content</item>
<item name="android:layout_gravity">center_horizontal</item>
<item name="android:background">#drawable/backbutton</item>
<item name="android:textColor">#FFFFFF</item>
<item name="android:textSize">8pt</item>
<item name="android:textStyle">bold</item>
<item name="android:layout_margin">10pt</item>
</style>
I think it could be enough for you to define your style without "parent".

This is mostly for future visitors, I found a solution to the problem:
<style name="App_TextButtonStyle" parent="#android:style/Widget.Button">
<item name="android:background">#drawable/filled_roundededges_nostroke</item>
</style>
#android:style/Widget.Button references the default style of the button in the currently selected theme. You could also use the holo widget button style #android:style/Widget.Holo.Button (available since api 11).
You might want to look in <android-sdk-install-folder>/platforms/android-XX/data/res/values for the files styles.xml and themes.xml to check out all styles android uses for a given platform version.

How can I style every font in every TextView using 1 line of code?

I want to style all the hundreds of textviews that I've created over dozens of file using a global style. how can i do this?

You need to create separate style resources in /res/values/style.xml
here is a sample style
<style name="style_title">
<item name="android:textColor">#ffffffff</item>
<item name="android:textSize">18dip</item>
<item name="android:shadowColor">#000000</item>
<item name="android:shadowDx">1</item>
<item name="android:shadowDy">1</item>
<item name="android:shadowRadius">2</item>
</style>
You can find more info here : http://developer.android.com/guide/topics/ui/themes.html

The answer can be found here. Maybe even a few additional chunks of info.
Setting global styles for Views in Android

styles multiple inheritance

Is there any way to make a style inherit from multiple other styles, instead of just being limited to:
<style name="WidgetTextBase">
<item name="android:typeface">serif</item>
<item name="android:textSize">12dip</item>
<item name="android:gravity">center</item>
</style>
<style name="BOSText" parent="WidgetTextBase">
<item name="android:textColor">#051C43</item>
</style>
I would like BOSText to also inherit from:
<style name="WidgetTextHeader">
<item name="android:textStyle">bold</item>
<style>

Styles do not support multiple inheritance (at least not as of Android 3.2).
The official docs say:
If you use the dot notation to extend a style, and you also include
the parent attribute, then the parent styles override any styles
inheritted through the dot notation.

You can only inherit one style. However, you can also make the inherited style inherit from another style, and so on:
<style name="WidgetTextBase">
<item name="android:typeface">serif</item>
<item name="android:textSize">12dip</item>
<item name="android:gravity">center</item>
</style>
<style name="WidgetTextHeader" parent="WidgetTextBase">
<item name="android:textStyle">bold</item>
</style>
<style name="BOSText" parent="WidgetTextHeader">
<item name="android:textColor">#051C43</item>
</style>
You can't inherit more than one style, but you can set up an inheritance chain.

For those who was looking for solution to just merge multiple different styles into one, you can use
public void applyStyle (int resId, boolean force)
https://developer.android.com/reference/android/content/res/Resources.Theme#applyStyle(int,%20boolean).
And apply it that way
context.theme.applyStyle(R.style.MyAdditionalStyle, false)
Whenever you specify true as second argument, it overrides existing values in your theme, and when false it adds only non-overlapping values from R.style.MyAdditionalStyle
I haven't tested scenario with multiple styles yet, but according to docs you can achieve it. So that's how this approach can be used as an alternative to multiple inheritance.

There is a parent attribute on the style tag that should let you inherit from other styles...
i.e.
<style name="CodeFont" parent="#style/WidgetTextBase">
<item name="android:textStyle">bold</item>
</style>
http://developer.android.com/guide/topics/ui/themes.html