Question

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How to read custom attributes in Android

Recently I read about custom attributes. I want to add a custom attribute to TextView.

So far I have:

attr file:

<resources>
    <attr name="binding" format="string" />
    <declare-styleable name="TextView">
        <attr name="binding" />
    </declare-styleable>

layout file:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
     xmlns:custom="http://schemas.android.com/apk/res/de.innosoft.android"
    android:id="@+id/RelativeLayout1"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

        <TextView
            custom:binding="test"/>

Given a TextView

TextView tv = ...

How would I then get the value of that attribute (which ist “test”)? I read about obtainStyledAttributes but do not know exactly how to use it here.

Answer 1

As I know you have 2 options:

• Create your own view that extends TextView and has constructor that takes AttributeSet. Then you can get custom property in this constructor. Check this tutorial: Creating a View Class.
• Implement own LayoutInfalter.Factory where you handle custom attributes.

Better check this question: How to read custom attributes in Android it’s almost the same.