Resources$NotFoundException in Graphical Layout ADT preview (but app actually Works)

Question

My problem is that loading an array of strings defined in XML works in the app but will result in an error in the ADT Graphical Layout preview.

Now I can\'t see any

Answer 1

Your code is alright but unfortunately there are still some bugs in ADT plugin and there is one of them. Layout Editor has troubles with rendering custom views. I had the same issue and the only workout I have found is checking View.isInEditMode and initializing int array in some other way but not from resources. So your code will look like this:

int score_vals[];
if (isInEditMode()) {
    score_vals = { 10, 20, 50 };
} else {
    score_vals = getResources().getIntArray(R.array.score_vals);
}

And by the way don't create or load any resources in your onDraw methods. I suppose getResources().getIntArray uses some sort of caching but anyway your perfomance may suffer.

Answer 2

I found a kind of a workaround whereby you have to hijack android's own attributes to get access to resources in the designer.

The following should provide the idea, but you would have to find a native android property of type int[]

This custom view XML should render in the graphical layout preview while using resources

<!-- Could override individual attributes here too rather than using a style -->
<com.github.espiandev.showcaseview.ShowcaseView
     style="@style/ShowcaseView"/>

styles.xml - Style specifying some of the resources to use

<style name="ShowcaseView" parent="match_fill">
    <!--# Cling drawable -->
    <item name="android:src">@drawable/cling</item>
    <!--# Title #-->
    <item name="android:contentDescription">@string/showcase_title</item>
    <!--# Description #-->
    <item name="android:description">@string/showcase_description</item>
    <!--# Button Text #-->
    <item name="android:text">@string/ok</item>
    <item name="sv_titleTextColor">#33B5E5</item>
    <item name="sv_detailTextColor">#FFFFFF</item>
    <item name="sv_backgroundColor">#3333B5E5</item>
    <item name="sv_buttonBackgroundColor">#3333B5E5</item>
    <item name="sv_buttonForegroundColor">#33B5E5</item>
</style>

attrs.xml - Custom attribute definition compatible with design-time preview

<!-- The android attrs assume the corresponding android format / data type --> 
<declare-styleable name="ShowcaseView">
    <!--# Cling drawable -->
    <attr name="android:src"/>
    <!--# Title #-->
    <attr name="android:contentDescription"/>
    <!--# Description #-->
    <attr name="android:description"/>
    <!--# Button Text #-->
    <attr name="android:text"/>
    <attr name="sv_backgroundColor" format="color|reference" />
    <attr name="sv_detailTextColor" format="color|reference" />
    <attr name="sv_titleTextColor" format="color|reference" />
    <attr name="sv_buttonBackgroundColor" format="color|reference" />
    <attr name="sv_buttonForegroundColor" format="color|reference" />
</declare-styleable>

ShowcaseView.java - Using the custom attributes in the custom view

public ShowcaseView(Context context) {
    this(context, null, R.styleable.CustomTheme_showcaseViewStyle);
}

public ShowcaseView(Context context, AttributeSet attrs) {
    this(context, attrs, R.styleable.CustomTheme_showcaseViewStyle);
}

public ShowcaseView(Context context, AttributeSet attrs, int defStyle) {
    super(context, attrs, defStyle);
    // Get the attributes for the ShowcaseView
    final TypedArray styled = context.getTheme().obtainStyledAttributes(attrs, R.styleable.ShowcaseView, 0, 0);
    showcase = styled.getDrawable(R.styleable.ShowcaseView_android_src);
    titleText = styled.getString(R.styleable.ShowcaseView_android_contentDescription);
    subText = styled.getString(R.styleable.ShowcaseView_android_description);
    buttonText = styled.getString(R.styleable.ShowcaseView_android_text);
    backColor = styled.getInt(R.styleable.ShowcaseView_sv_backgroundColor, Color.argb(128, 80, 80, 80));
    detailTextColor = styled.getColor(R.styleable.ShowcaseView_sv_detailTextColor, Color.WHITE);
    titleTextColor = styled.getColor(R.styleable.ShowcaseView_sv_titleTextColor, Color.parseColor("#49C0EC"));
    styled.recycle();
    // Now make use of the fields / do further initialization ..
}