Develop Reference

Having a issue on applying custom font in android app

I want to set a custom font in my app and done that by
Is it possible to set a custom font for entire of application?
and i have done it but the problem is when i apply AppTheme_1 it changes font for android version greater than or equal to lollipop and when i apply AppTheme_2
then it changes fonts for only android version less than lollipop. But I want to change the font for all android versions.
<style name="AppBaseTheme" parent="android:Theme.Holo.Light.DarkActionBar">
</style>
<style name="AppTheme_1" parent="AppBaseTheme">
<!-- Customize your theme here. -->
<item name="android:textAppearance">#style/CustomTextAppearance</item>
<item name="colorPrimary">#color/colorPrimary</item>
<item name="colorPrimaryDark">#color/colorPrimaryDark</item>
<item name="colorAccent">#color/colorAccent</item>
<item name="android:windowNoTitle">true</item>
<item name="android:windowFullscreen">true</item>
<item name="windowNoTitle">true</item>
<item name="windowActionBar">false</item>
<item name="android:windowContentOverlay">#null</item>
</style>
<style name="CustomTextAppearance">
<item name="android:typeface">serif</item>
</style>
</style>
<style name="AppTheme_2" parent="AppBaseTheme">
<!-- Customize your theme here. -->
<item name="android:typeface">serif</item>
<item name="colorPrimary">#color/colorPrimary</item>
<item name="colorPrimaryDark">#color/colorPrimaryDark</item>
<item name="colorAccent">#color/colorAccent</item>
<item name="android:windowNoTitle">true</item>
<item name="android:windowFullscreen">true</item>
<item name="windowNoTitle">true</item>
<item name="windowActionBar">false</item>
<item name="android:windowContentOverlay">#null</item>
</style>

We can achieve to set a single font to entire application using Calligraphy lib
Here is the library link: Calligraphy
Now add compile 'uk.co.chrisjenx:calligraphy:2.3.0' in your build.gradle
Now create an application class like follows:
public class MyApplication extends Application {
private static MyApplication sInstance;
public static MyApplication getInstance() {
return sInstance;
}
#Override
public void onCreate() {
super.onCreate();
sInstance = this;
CalligraphyConfig.initDefault(new CalligraphyConfig.Builder()
.setDefaultFontPath("fonts/Roboto-Regular.ttf")
.setFontAttrId(R.attr.fontPath)
.build());
}}
Now you need to call this application class in manifest file like follows in application tag
android:name=".MyApplication"
By doing this entire app have set one font. You can go through the library for better understanding.

Try this
MyApplication.java (This is Application class)
//Typeface
public static Typeface poppinsSemiBold;
public static Typeface helveticaNeueMedium;
public static Typeface poppinsRegular;
/**
* Preload typefaces.
*/
private void preloadTypefaces() {
poppinsSemiBold = Typefaces.get(getApplicationContext(), Typefaces.FONT_POPPINS_SEMI_BOLD);
helveticaNeueMedium = Typefaces.get(getApplicationContext(), Typefaces.FONT_HELVETICANEUE_MEDIUM);
poppinsRegular = Typefaces.get(getApplicationContext(), Typefaces.FONT_POPPINS_REGULAR);
}
call this preloadTypefaces() in onCreate() of same class MyApplication.java
Typefaces.java
import android.content.Context;
import android.graphics.Typeface;
import android.util.Log;
import java.util.Hashtable;
public class Typefaces {
private static final String TAG = Typefaces.class.getSimpleName();
public static final String FONT_POPPINS_SEMI_BOLD = "fonts/Poppins_SemiBold.ttf";
public static final String FONT_HELVETICANEUE_MEDIUM = "fonts/HelveticaNeue_Medium.otf";
public static final String FONT_POPPINS_REGULAR = "fonts/Poppins_Regular.ttf";
private static final Hashtable<String, Typeface> cache = new Hashtable<String, Typeface>();
public static Typeface get(Context c, String assetPath) {
synchronized (cache) {
if (!cache.containsKey(assetPath)) {
try {
Typeface t = Typeface.createFromAsset(c.getAssets(), assetPath);
cache.put(assetPath, t);
} catch (Exception e) {
Log.e(TAG, "Could not get typeface '" + assetPath
+ "' because " + e.getMessage());
return null;
}
}
return cache.get(assetPath);
}
}
}
Make sure your .ttf or .otf file is in assets/fonts/HelveticaNeue_Medium.otf added like that
res/values/attrs.xml
<?xml version="1.0" encoding="utf-8"?>
<resources>
<declare-styleable name="CustomFontTextView">
<attr name="fontStyle" format="enum">
<enum name="poppinsSemiBold" value="1" />
<enum name="helveticaNeueMedium" value="2" />
<enum name="poppinsRegular" value="3" />
</attr>
</declare-styleable>
<declare-styleable name="TextViewPlus">
<attr name="customFont" format="string" />
</declare-styleable>
</resources>
Custom Font class
TextViewPlus.java
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Typeface;
import android.util.AttributeSet;
import android.util.Log;
import android.widget.TextView;
import com.offerbuk.R;
import com.offerbuk.app.MyApplication;
public class TextViewPlus extends TextView {
private static final String TAG = "TextViewPlus";
private int fontStyle;
private TypedArray a = null;
public TextViewPlus(Context context) {
super(context);
init(null, 0);
}
public TextViewPlus(Context context, AttributeSet attrs) {
super(context, attrs);
init(attrs, 0);
}
public TextViewPlus(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
init(attrs, defStyle);
}
private void init(AttributeSet attrs, int defStyle) {
try {
this.a = getContext().obtainStyledAttributes(attrs, R.styleable.CustomFontTextView, defStyle, 0);
this.fontStyle = a.getInteger(R.styleable.CustomFontTextView_fontStyle, 0);
} finally {
if (this.a != null)
this.a.recycle();
}
if (!isInEditMode()) {
switch (fontStyle) {
case 1:
setTypeface(MyApplication.poppinsSemiBold);
break;
case 2:
setTypeface(MyApplication.helveticaNeueMedium);
break;
case 3:
setTypeface(MyApplication.poppinsRegular);
break;
default:
setTypeface(MyApplication.poppinsRegular);
break;
}
}
}
}
Use this in Your layout file
<TextViewPlus
android:layout_width="wrap_content"
android:layout_height="wrap_content"
card_view:fontStyle="poppinsRegular" />

Styling android.support.v7.preference.SeekBarPreference

First of all I am pretty new in programming Xamarin and Android. I have created a SeekbarPreference but some how they layout does not display all correctly. The value is dropping of from the box (see picture).
My styles.xml:
<?xml version="1.0" encoding="utf-8" ?>
<resources>
<style name="MyTheme" parent="MyTheme.Base">
</style>
<style name="MyTheme.Base" parent="Theme.AppCompat.Light.NoActionBar">
<item name="colorPrimary">#EC6A1E</item>
<item name="colorAccent">#EC6A1E</item>
<item name="toolbarStyle">#style/custom_toolbar</item>
<item name="preferenceTheme">#style/PreferenceThemeOverlay.v14.Material.Fix</item>
</style>
<style name="custom_toolbar" parent="#style/Widget.AppCompat.Toolbar">
<item name="titleTextColor">#FFFFFF</item>
</style>
<style name="PreferenceThemeOverlay.v14.Material.Fix" parent="PreferenceThemeOverlay.v14.Material">
<item name="seekBarPreferenceStyle">#style/Preference.SeekBarPreference.Fix</item>
</style>
<style name="Preference.SeekBarPreference.Fix">
</style>
</resources>
Here is my settings.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.preference.PreferenceScreen
xmlns:android="http://schemas.android.com/apk/res/android">
<android.support.v7.preference.SeekBarPreference
android:id="#+id/preference_range_seek_bar"
android:layout_height="wrap_content"
android:key="range"
android:title="Range"
android:summary="Here you can set the range of your location"
android:max="10000"
android:defaultValue="500" />
<android.support.v7.preference.SeekBarPreference
android:key="favRange"
android:title="Favorite Range"
android:summary="Here you can set the range of your Favorite location"
android:max="10000"
android:defaultValue="500" />
<android.support.v7.preference.Preference android:title="Title" android:summary="This is the summary">
</android.support.v7.preference.Preference>
</android.support.v7.preference.PreferenceScreen>
What I do not understand is how can I find which xml attributes I can use on the SeekBarPreference to fix this. When I look in Googles Documents I cannot find a description of xml attributes on this SeekBarPreference.
I know my theme is fuzzy as I played a lot with it. But when I have it working I will adjust this.
Hopefully someone could help me, or have an example..

Ran into the same issue. Here you go with the solution, testion on emulator running API 25:
Step 1, Create a new class that extends SeekBarPreference
public class CustomSeekBarPreference extends SeekBarPreference {
private TextView mSeekBarValueTextView;
public CustomSeekBarPreference(Context context,
AttributeSet attributeSet,
int i, int i1) {
super(context, attributeSet, i, i1);
}
public CustomSeekBarPreference(Context context, AttributeSet attributeSet, int i) {
super(context, attributeSet, i);
}
public CustomSeekBarPreference(Context context, AttributeSet attributeSet) {
super(context, attributeSet);
}
public CustomSeekBarPreference(Context context) {
super(context);
}
#Override
public void onBindViewHolder(PreferenceViewHolder preferenceViewHolder) {
super.onBindViewHolder(preferenceViewHolder);
mSeekBarValueTextView = (TextView) preferenceViewHolder.findViewById(android.support.v7.preference.R.id.seekbar_value);
if (mSeekBarValueTextView != null) {
LayoutParams layoutParams = mSeekBarValueTextView.getLayoutParams();
layoutParams.height = LayoutParams.WRAP_CONTENT;
mSeekBarValueTextView.setLayoutParams(layoutParams);
}
}
}
In your preferences.xml replace the SeekBarPreference class name with the custom class name.
<com.google.xxx.view.CustomSeekBarPreference
android:key="cacheLimit"
android:title="#string/setting_cache_limit_title"
android:dependency="enableCaching"
android:defaultValue="20"
android:max="40"/>

How to set default parameters to custom UI Class?

I have created a Custom Class called RoundedButton that extends Button. I want to assign some default parameters. How to go about it?
There was no change after I implemented the xml codes below. Basically the style was not getting added by default. I don't know what I am missing.
in styles.xml
<resources>
<style name="AppTheme" parent="#android:style/Theme.Light">
<item name="RoundedButtonStyle">#style/CustomView</item>
</style>
<style name="CustomView">
<item name="android:clickable">true</item>
<item name="android:focusable">true</item>
<item name="android:focusableInTouchMode">true</item>
<item name="android:colorBackground">#color/transparent</item>
<item name="android:textColor">#color/blue</item>
<item name="android:windowBackground">#color/transparent</item>
<item name="android:background">#drawable/button_border</item>
<item name="android:gravity">center</item>
</style>
</resources>
in attrs.xml
<resources>
<attr name="RoundedButtonStyle" type="reference" />
</resources>
manifest:
android:theme="#style/AppTheme"
RoundButton.java
public RoundedButton(Context context) {
super(context);
ctx = context;
}
public RoundedButton(Context context, AttributeSet attrs) {
super(context, attrs, R.attr.RoundedButtonStyle);
ctx = context;
TypedArray attrsArray = context.obtainStyledAttributes(attrs, R.styleable.RoundedButtonAttrs, 0, 0);
initAttributesArray(attrsArray);
attrsArray.recycle();
initializeRoundedButton();
}
I have used this and this for trying to solve it.
EDIT: Earlier I had an issue that the background was light grey and did not change, I discovered the issue was because of a line of code that I had later in the UI Class.

Android: How to custom-declare XML namespace in styles.xml?

I'm trying to put the custom XML namespace in the styles.xml and inherit it in the layout. I don't know how to declare the custom XML namespace in the styles.xml as I do in layout xml (e.g. xmlns:app="http://schemas.android.com/tools").
How do I use custom XML namespace in the styles.xml?
What I have:
The font asset, ReallyCoolFont.ttf is saved in the asset/fonts.
my_layout.xml:
<TextView
<!-- more attributes here -->
app:customFont="fonts/ReallyCoolFont.ttf"
<!-- more attributes here -->
</TextView>
styles.xml:
<style name="CoolTextView">
<!-- more items here -->
<!-- more items here -->
</style>
What I'd like to have:
my_layout.xml:
<TextView
<!-- more attributes here -->
style="#style/CoolTextView
<!-- more attributes here -->
</TextView>
styles.xml:
<style name="CoolTextView">
<!-- more items here -->
<item name="app:customFont">ReallyCoolFont.ttf</item>
<!-- more items here -->
</style>
Error I get:
Error:(1403, 21) No resource found that matches the given name: attr 'app:customFont'.

You need to define an attribute for your fonts in attr.xml file in res folder:
<attr name="myfonts" format="string" />
And you need to define custom style for your TextView and here we use our defined attribute(myfonts):
<declare-styleable name="MyCustomStyle">
<attr name="myfonts" />
</declare-styleable>
Then styles can be declared:
<style name="CoolTextView">
<item name="myfonts">ReallyCoolFont.ttf</item>
</style>
summary of what you have so far:
<?xml version="1.0" encoding="utf-8"?>
<resources>
<attr name="myfonts" format="string">
</attr>
<declare-styleable name="MyCustomStyle">
<attr name="myfonts" />
</declare-styleable>
<style name="CoolTextView">
<item name="myfonts">ReallyCoolFont.ttf</item>
</style>
</resources>
4)Now your layout would be:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<com.example.MyCustomTextView
android:id="#+id/result"
style="#style/CoolTextView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:text="HELLO WORLD!"
android:textSize="24dp"
android:gravity="center" >
</com.example.MyCustomTextView>
</RelativeLayout>
5)and your MyCustomTextView is:
public class MyCustomTextView extends TextView {
private static final String TAG = "TextView";
public MyCustomTextView(Context context) {
super(context);
}
public MyCustomTextView(Context context, AttributeSet attrs) {
super(context, attrs);
settingFont(context, attrs);
}
public MyCustomTextView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
settingFont(context, attrs);
}
private void settingFont(Context ctx, AttributeSet attrs) {
TypedArray a = ctx.obtainStyledAttributes(attrs, R.styleable.MyCustomStyle);
String customFont = a.getString(R.styleable.MyCustomStyle_myfonts);
Typeface tf = null;
try {
tf = Typeface.createFromAsset(ctx.getAssets(), customFont);
} catch (Exception e) {
Log.e(TAG,e.getMessage());
a.recycle();
return;
}
setTypeface(tf);
a.recycle();
}
}
I assumed you put the font in asset not in asset/fonts directory.
also I highly recommend read this.

You don't need to add any prefix to reference your custom attributes in the style resource files. Doing it like this will work just fine:
<style name="CoolTextView">
<item name="customFont">ReallyCoolFont.ttf</item>
</style>

The answer is to NOT specify the namespace in the style.
<?xml version="1.0" encoding="utf-8" ?>
<resources xmlns:custom="http://schemas.android.com/apk/res/com.custom.project">
<style name="CustomStyle">
<item name="android:layout_width">wrap_content</item>
<item name="android:layout_height">wrap_content</item>
<item name="customAttr">value</item> <!-- tee hee -->
</style>
</resources>

You don't need any prefixes, it will work without them. This is code from one of my projects, which works just fine
<style name="defaultTriangle">
<item name="triangleColor">#FF33B5E5</item>
<item name="triangleStrokeColor">#android:color/black</item>
<item name="triangleStrokeWidth">3dp</item>
</style>
<si.kseneman.views.Triangle
style="#style/defaultTriangle"
android:layout_width="match_parent"
android:layout_height="0dip"
android:layout_weight="1"
android:padding="10dp"
android:rotation="0"
/>

I've done next for custom font
CustomTextView
public class KlavikaTextView extends TextView {
private final static int KLAVIKA_BOLD = 0;
private final static int KLAVIKA_BOLD_ITALIC = 1;
private final static int KLAVIKA_LIGHT = 2;
private final static int KLAVIKA_LIGHT_ITALIC = 3;
private final static int KLAVIKA_MEDIUM = 4;
private final static int KLAVIKA_MEDIUM_ITALIC = 5;
private final static int KLAVIKA_REGULAR = 6;
private final static int KLAVIKA_REGULAR_ITALIC = 7;
public KlavikaTextView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
parseAttributes(context, attrs);
}
public KlavikaTextView(Context context, AttributeSet attrs) {
super(context, attrs);
parseAttributes(context, attrs);
}
public KlavikaTextView(Context context) {
super(context);
}
private void parseAttributes(Context context, AttributeSet attrs) {
TypedArray values = context.obtainStyledAttributes(attrs, R.styleable.KlavikaTextView);
// The value 0 is a default, but shouldn't ever be used since the attr is an enum
int typeface = values.getInt(R.styleable.KlavikaTextView_typeface, KLAVIKA_REGULAR);
// You can instantiate your typeface anywhere, I would suggest as a
// singleton somewhere to avoid unnecessary copies
switch (typeface) {
case KLAVIKA_BOLD:
setTypeface(App.klavikaBold);
break;
case KLAVIKA_BOLD_ITALIC:
setTypeface(App.klavikaBoldItalic);
break;
case KLAVIKA_LIGHT:
setTypeface(App.klavikaLight);
break;
case KLAVIKA_LIGHT_ITALIC:
setTypeface(App.klavikaLightItalic);
break;
case KLAVIKA_MEDIUM:
setTypeface(App.klavikaMedium);
break;
case KLAVIKA_MEDIUM_ITALIC:
setTypeface(App.klavikaMediumItalic);
break;
case KLAVIKA_REGULAR_ITALIC:
setTypeface(App.klavikaRegularItalic);
break;
case KLAVIKA_REGULAR:
default:
setTypeface(App.klavikaRegular);
break;
}
}}
Then in values I've created attr.xml
<!-- Define the values for the attribute -->
<attr name="typeface" format="enum">
<enum name="klavika_bold" value="0" />
<enum name="klavika_bold_italic" value="1" />
<enum name="klavika_light" value="2" />
<enum name="klavika_light_italic" value="3" />
<enum name="klavika_medium" value="4" />
<enum name="klavika_medium_italic" value="5" />
<enum name="klavika_regular" value="6" />
<enum name="klavika_regular_italic" value="7" />
</attr>
<!--
Tell Android that the class "KlavikaTextView" can be styled,
and which attributes it supports-->
<declare-styleable name="KlavikaTextView">
<attr name="typeface" />
</declare-styleable>
Next created the style
<style name="TextView.Example">
<item name="typeface">klavika_bold</item>
</style>
This style you can use for your xml Layouts
style="#style/TextView.Example"

<?xml version="1.0" encoding="utf-8"?>
<resources
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:custom="http://schemas.android.com/apk/res/com.my.project">
<style name="my_style"> <item name="custom:tag">some_value</item> </style>
</resources>
you are trying to apply XML namespacing to an attribute value, which won't work. In this case, you should specify the package name directly, like this:
<style name="my_style"> <item name="com.my.project:tag">some_value</item> </style>

Fast solution via code!
String pathFont = "fonts/ReallyCoolFont.ttf";
TextView text = (TextView) findViewById(R.id.TextView1);
Typeface fontFace = Typeface.createFromAsset( getAssets(), pathFont );
text.setTypeface( fontFace );
Third-party libraries , solve the problem, in XML!
1 - https://github.com/leok7v/android-textview-custom-fonts
2 - https://github.com/ragunathjawahar/android-typeface-textview
My suggestion
You will have other needs, and for each component
you will have to customize a class.
Another problem you have other layouts and N TextView components
for maintenance you will have a lot of work .
I use this method in projects in the OnCreate of my activity
if I need to change the font I have to do this
only in the OnCreate method of each activity .
private static final String FONT = "ReallyCoolFont.ttf";
public static void allTextView(final Context context, final View root) {
String fontPath = FONT;
try {
if (root instanceof ViewGroup) {
ViewGroup viewGroup = (ViewGroup) root;
int childCount = viewGroup.getChildCount();
for (int i = 0; i < childCount; i++)
allTextView(context, viewGroup.getChildAt(i) );
} else if (root instanceof TextView)
((TextView) root).setTypeface(Typeface.createFromAsset(context.getAssets(), fontPath));
} catch (Exception e) {
e.printStackTrace();
}
}
// call in OnCreate Activity
allTextView(this, findViewById(R.layout.main) );

The custom attributes are defined using <declare-styleable> tags; usually the file is called attrs.xml. The namespace declaration will have your app's package name in it.
The whole process is described here: Creating a View Class | Android Developers

Apply style for button group in Android

In my Android application I need to apply style for a group of buttons, instead of styling each button individual. Something like this:
<?xml version="1.0" encoding="utf-8"?>
<!-- put here style="#ststyle/Button_Style" -->
<Button android:id="#+id/button1" android:text="#string/b01" />
<Button android:id="#+id/button2" android:text="#string/b02" />
<Button android:id="#+id/button4" android:text="#string/b03" />
<!-- end style -->

You can write the style for button like this ;
style_btn.xml
<style name="style_btn" parent="Wrap">
<item name="android:background">#drawable/btn_bg</item>
<item name="android:gravity">center</item>
<item name="android:textColor">#android:color/white</item>
<item name="android:textStyle">bold</item>
<item name="android:layout_marginTop">4dp</item>
<item name="android:minWidth">90dp</item>
</style>
apply that style to your button :
<Button
android:id="#+id/attach_file"
style="#style/style_btn"
android:layout_centerVertical="true"
android:background="#drawable/orange_bg"
android:drawablePadding="10dp"
android:drawableRight="#drawable/attach"
android:text="#string/str_email_attach" />

If you need the style to all of the buttons in your application, mention in your App theme style, Then no need to apply for every button.
<style name="YourTheme" parent="android:Theme.Light">
<item name="android:buttonStyle">#style/Button</item>
</style>
If you need the style to particluar button , then apply to every button
<Button
android:id="#+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
style="#style/Button"
android:text="Button" />

I know I'm late joining the party but I stumbled across this when trying to figure out the same problem myself.
What I did was:
Depending on how may button groups you have (say 3 for example) you need to subclass button and create three custom button classes (see below)
//Custom button 1
public class CustomButton1 extends Button {
public CustomButton1(Context context, AttributeSet attrs) {
super(context, attrs, R.attr.attrStyle1);
}
public CustomButton1(Context context, AttributeSet attrs, int defStyle) {
super(context, null, R.attr.attrStyle1);
}
}
//Custom button 2
public class CustomButton2 extends Button {
public CustomButton2(Context context, AttributeSet attrs) {
super(context, attrs, R.attr.attrStyle2);
}
public CustomButton2(Context context, AttributeSet attrs, int defStyle) {
super(context, null, R.attr.attrStyle2);
}
}
//Custom button 3
public class CustomButton3 extends Button {
public CustomButton3(Context context, AttributeSet attrs) {
super(context, attrs, R.attr.attrStyle3);
}
public CustomButton3(Context context, AttributeSet attrs, int defStyle) {
super(context, null, R.attr.attrStyle3);
}
}
You can see from the custom classes I have passed a custom attr. These I define in my styles.xml and use them as reference. See my styles.xml below:
<!-- Base application theme. -->
<style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
<!-- Customize your theme here. -->
</style>
<style name="theme1">
<item name="#attr/attrStyle1">#style/CustomButton1</item>
<item name="#attr/attrStyle2">#style/CustomButton2</item>
<item name="#attr/attrStyle3">#style/CustomButton3</item>
<item name="android:background">#color/warning_yellow_colour</item>
</style>
<style name="CustomButton1" parent = "#android:style/Widget.Button">
<item name="android:textColor">#color/white_colour</item>
<item name="android:padding">20dp</item>
<item name="android:background">#color/banner_background_sensor_colour</item>
</style>
<style name="CustomButton2" parent = "#android:style/Widget.Button">
<item name="android:textColor">#color/white_colour</item>
<item name="android:padding">20dp</item>
<item name="android:background">#color/button_red_colour</item>
</style>
<style name="CustomButton3" parent = "#android:style/Widget.Button">
<item name="android:textColor">#color/white_colour</item>
<item name="android:padding">20dp</item>
<item name="android:background">#color/text_blue_colour</item>
</style>
<attr name="attrStyle1" format="reference"/>
<attr name="attrStyle2" format="reference"/>
<attr name="attrStyle3" format="reference"/>
By linking the style to the attr, you then apply that style to your custom class, which you can then duplicate as many times as needed
CustomButton1 theme1 = (CustomButton1)findViewById(R.id.theme1);
CustomButton2 theme2 = (CustomButton2)findViewById(R.id.theme2);
CustomButton3 theme3 = (CustomButton3)findViewById(R.id.theme3);
Hopefully this is of benefit to someone!