Android：继承xml中的组件

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?

Answer 1

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>

Answer 2

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".