Can't render SpectrumPalette in Android Studio because of NPE on computeHeight

[ripern]

Android Studio cannot render SpectrumPalette in its Preview
I've had this problem with v0.6 for several months, today I switched to 0.7 in hope it had been fixed but same thing, stacktrace:

java.lang.NullPointerException   at com.thebluealliance.spectrum.SpectrumPalette.computeHeight(SpectrumPalette.java:186)   at com.thebluealliance.spectrum.SpectrumPalette.onMeasure_Original(SpectrumPalette.java:153)   at com.thebluealliance.spectrum.SpectrumPalette.onMeasure(SpectrumPalette.java:-1)   at android.view.View.measure(View.java:19731)   at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6120)   at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1464)   at android.widget.LinearLayout.measureVertical(LinearLayout.java:758)   at android.widget.LinearLayout.onMeasure(LinearLayout.java:640)   at android.view.View.measure(View.java:19731)   at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6120)   at android.support.design.widget.CoordinatorLayout.onMeasureChild(CoordinatorLayout.java:714)   at android.support.design.widget.CoordinatorLayout.onMeasure_Original(CoordinatorLayout.java:786)   at android.support.design.widget.CoordinatorLayout.onMeasure(CoordinatorLayout.java:-1)   at android.view.View.measure(View.java:19731)   at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6120)   at android.widget.FrameLayout.onMeasure(FrameLayout.java:185)   at android.view.View.measure(View.java:19731)   at android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java:715)   at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:461)   at android.view.View.measure(View.java:19731)

Does it not support being a child of a CoordinatorLayout?
I have: (I tried formatting but never came out better than this, sorry)

`
<android.support.design.widget.CoordinatorLayout
android:id="@+id/prefsCoordinator"
android:layout_width="match_parent"
android:layout_height="match_parent">

   <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="?attr/actionBarSize"
        android:fitsSystemWindows="true"
        android:orientation="vertical">

        <com.thebluealliance.spectrum.SpectrumPalette
            android:id="@+id/color_palette"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            app:spectrum_autoPadding="true"/>

    </LinearLayout>

</android.support.design.widget.CoordinatorLayout>
`

[nwalters512]

That shouldn't be throwing exceptions; I'll release a fix for that. Regardless, the layout previewer won't be of much use if you set the colors programmatically. If you want to see anything other than an empty box in the previewer, you'll have to provide the colors array with the spectrum_colors attribute.

Coincidentally, I think I found a bug in the Layout Editor: a colors array set via an XML attribute isn't properly being provided in preview mode. Relevant bug is here: https://code.google.com/p/android/issues/detail?id=230875

[ripern]

Thanks for the super quick response and fix!