Android: inheritance of components in xml

Question

I have 5 buttons on my activity that differ each other only with value height:

    <Button
    android:id="@+id/someName"
    android:layout_width="170dp"
    android:layout_height="70dp"
    android:layout_marginTop="10dp"
    android:text="@string/some_text" />

    ... other buttons...

Is it possible to extends 4 buttons from first one and change only one of their property?
I know it is possible for styles, but what with components?
Or maybe should i do this in java code, but then how to connect to specific class?

rainbow · Accepted Answer · 2013-12-19 13:47:35Z

2

I've found a detailed answer:
http://docs.xamarin.com/recipes/android/resources/general/style_a_button/

My own example based on URL above:

1) res\drawable\category_button.xml

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">

    <item android:state_pressed="true"><shape android:shape="rectangle">
            <solid android:color="#ef4444" />

            <corners android:radius="15dp" />
        </shape></item>
    <item><shape android:shape="rectangle">
            <solid android:color="#D8D8D8" />

            <corners android:radius="15dp" />
        </shape></item>

</selector>

2) res\layout\some_activity.xml

 ... some xml code ...
 <Button
        android:id="@+id/buttonTestCatA"
        style="@style/category_button"
        android:background="@drawable/category_button"
        android:text="@string/test_cat_A" />
... some xml code ...

3) res\values\styles.xml

<resources>

    <style name="AppBaseTheme" parent="Theme.AppCompat.Light"></style>

    <style name="AppTheme" parent="AppBaseTheme"></style>

    <style name="category_button">
        <item name="android:layout_width">170dp</item>
        <item name="android:layout_height">70dp</item>
        <item name="android:layout_margin">5dp</item>
        <item name="android:textSize">25sp</item>
    </style>

</resources>

edited Dec 19, 2013 at 13:47

answered Dec 9, 2013 at 14:21

rainbow

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1 Comment

Simulant Over a year ago

Please extract the key notes from the link and add them to your answer so it is understandable even if the link is dead. You can also accept your own answer.

Manitoba · Accepted Answer · 2013-12-09 11:28:38Z

-1

You must create a new XML file in your drawable folder. For example, let's rename it myCustomButton.xml.

<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item
        android:width="100dp"
        android:height="20dp" />
</selector>

Then, for each button you want to get the same behaviour, add this line: android:background="@drawable/myCustomButton".

answered Dec 9, 2013 at 11:28

Manitoba

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2 Comments

rainbow Over a year ago

As far as i know all names in res folder shoul contains only small lether then my_custom_button.xml is allowed. Anyway this doesn't works. Compiler complains that attributes that should be extended are not visible.

IgorGanapolsky Over a year ago

Is this solution better than using styles.xml?

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