Add custom string attribute in my custom android View

Question

I have a cusom view derived from TableLayout, and I need to declare String property Title, like this:

<com.mycompany.controls.NavigationControllerView xmlns:app="http://schemas.usetech.com/apk/res/onroad" title="@string/nav_title" ... />

(to be able specify value via resource reference). I've specified this property in values/attrs.xml:

<declare-styleable name="NavigationControllerView"> <attr name="title" format="string"/> ... </declare-styleable>

In my code I'm trying:

public class NavigationControllerView extends TableLayout { public NavigationControllerView(Context context, AttributeSet attrs) { super(context, attrs); View.inflate(getContext(), R.layout.inc_header, this); TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.NavigationControllerView); CharSequence title = a.getString(R.styleable.NavigationControllerView_title); if (title != null) setTitle(title.toString()); } ...

but no luck, title is always null. Do you see where I'm wrong?

woodshy · Accepted Answer · 2011-07-04 10:55:20Z

2

You should use

<com.mycompany.controls.NavigationControllerView xmlns:app="http://schemas.android.com/apk/res/onroad" app:title="@string/nav_title" ... />

do not miss app: prefix. Also correct namespace uri should be used.

edited Jul 4, 2011 at 10:55

answered Jul 4, 2011 at 10:16

woodshy

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3 Comments

ZlobnyiSerg Over a year ago

Ups, you are right, but even using app prefix Title is null, neither specifying resource reference neither providing direct string value

woodshy Over a year ago

maybe you're using whong custom namespace? I use xmlns:app="schemas.android.com/apk/res/'packagepath'" where 'packagepath' - root package path

ZlobnyiSerg Over a year ago

Right! Thank you, schema really should be in form: schemas.android.com/apk/res/com.mycompany.myapp Please fix xmlns:app in your answer and I'll mark it as correct

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