NullPointerException on a BlurView previously shown

[ricardomello]

I'm having trouble hiding and showing a BlurView, I have a grid with a few tiles, when a button is pressed the blur appears and then the user can hide it. When I show it for the first time or multiple times on the same tile it works properly but when I show it on another tile and go back to the first one I get an exception. The BlurView is inside a RelativeLayout and I'm using alpha + visibility to show/hide the layout (but it also happens if the Blur is outside this layout).

My code is:

final float radius = 8;
final View rootView = itemView.getRootView();

overlay.setupWith(rootView)
       .blurAlgorithm(new RenderScriptBlur(itemView.getContext(), true))
       .blurRadius(radius);
overlay.stopAutoBlurUpdate();

This is the exception:

java.lang.NullPointerException: Attempt to invoke virtual method 'int android.view.View.getLeft()' on a null object reference
at eightbitlab.com.blurview.DefaultBlurController.setupInternalCanvasMatrix(DefaultBlurController.java:181)
at eightbitlab.com.blurview.DefaultBlurController.drawBlurredContent(DefaultBlurController.java:212)
at eightbitlab.com.blurview.BlurView.draw(BlurView.java:57)
at android.view.View.updateDisplayListIfDirty(View.java:15190)
at android.view.View.draw(View.java:15964)
at android.view.ViewGroup.drawChild(ViewGroup.java:3612)
at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3402)
at android.view.View.updateDisplayListIfDirty(View.java:15185)
at android.view.View.draw(View.java:15964)
at android.view.ViewGroup.drawChild(ViewGroup.java:3612)
at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3402)
at android.view.View.updateDisplayListIfDirty(View.java:15185)
at android.view.View.draw(View.java:15964)
at android.view.ViewGroup.drawChild(ViewGroup.java:3612)
at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3402)
at android.view.View.draw(View.java:16197)
at android.view.View.updateDisplayListIfDirty(View.java:15190)
at android.view.View.draw(View.java:15964)
at android.view.ViewGroup.drawChild(ViewGroup.java:3612)
at android.support.v7.widget.RecyclerView.drawChild(RecyclerView.java:4134)
at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3402)
at android.view.View.draw(View.java:16197)
at android.support.v7.widget.RecyclerView.draw(RecyclerView.java:3543)
at android.view.View.updateDisplayListIfDirty(View.java:15190)
at android.view.View.draw(View.java:15964)
at android.view.ViewGroup.drawChild(ViewGroup.java:3612)
at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3402)
at android.view.View.updateDisplayListIfDirty(View.java:15185)
at android.view.View.draw(View.java:15964)
at android.view.ViewGroup.drawChild(ViewGroup.java:3612)
at android.support.design.widget.CoordinatorLayout.drawChild(CoordinatorLayout.java:1131)
at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3402)
at android.view.View.updateDisplayListIfDirty(View.java:15185)
at android.view.View.draw(View.java:15964)
at android.view.ViewGroup.drawChild(ViewGroup.java:3612)
at android.support.v4.widget.DrawerLayout.drawChild(DrawerLayout.java:1377)
at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3402)
at android.view.View.draw(View.java:16197)
at android.view.View.updateDisplayListIfDirty(View.java:15190)
at android.view.View.draw(View.java:15964)
at android.view.ViewGroup.drawChild(ViewGroup.java:3612)
at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3402)
at android.view.View.updateDisplayListIfDirty(View.java:15185)
at android.view.View.draw(View.java:15964)
at android.view.ViewGroup.drawChild(ViewGroup.java:3612)
at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3402)
at android.view.View.updateDisplayListIfDirty(View.java:15185)
at android.view.View.draw(View.java:15964)
at android.view.ViewGroup.drawChild(ViewGroup.java:3612)
at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3402)
at android.view.View.updateDisplayListIfDirty(View.java:15185)
at android.view.View.draw(View.java:15964)
at android.view.ViewGroup.drawChild(ViewGroup.java:3612)
at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3402)
at android.view.View.updateDisplayListIfDirty(View.java:15185)
at android.view.View.draw(View.java:15964)
at android.view.ViewGroup.drawChild(ViewGroup.java:3612)
at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3402)
at android.view.View.draw(View.java:16197)
at com.android.internal.policy.PhoneWindow$DecorView.draw(PhoneWindow.java:2690)
at android.view.View.updateDisplayListIfDirty(View.java:15190)
at android.view.ThreadedRenderer.updateViewTreeDisplayList(ThreadedRenderer.java:281)
at android.view.ThreadedRenderer.updateRootDisplayList(ThreadedRenderer.java:287)
at android.view.ThreadedRenderer.draw(ThreadedRenderer.java:322)

Thanks in advance.

[Dimezis]

Thank you, I'll fix it soon.

[Dimezis]

Can you please clarify, the grid you mentioned is ListView / GridView / RecyclerView?

If it's not, do you call removeView(View) to remove the BlurView?

[ricardomello]

The grid is a RecyclerView with a GridLayoutManager. I don't exactly remove the view, I merely hide it by animating the alpha of the RelativeLayout (that has the BlurView inside) to 0 and then setting the layout's visibility to gone.

[Dimezis]

Please check 1.1.0 version, I believe it should be fixed now.

[ricardomello]

It was fixed indeed, thanks!