Mpandroidchart: Bug: PieChartRenderer - NullPointerException: Attempt to invoke virtual method 'java.lang.Object java.lang.ref.WeakReference.get()' on a null object reference

Created on 30 Sep 2017 · 18Comments · Source: PhilJay/MPAndroidChart

mDrawBitmap seems to be null and thereby causing a NullPointerException. Here is the full stacktrace:

Fatal Exception: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.Object java.lang.ref.WeakReference.get()' on a null object reference at com.github.mikephil.charting.renderer.PieChartRenderer.drawExtras(PieChartRenderer.java:638) at com.github.mikephil.charting.charts.PieChart.onDraw(PieChart.java:131) at android.view.View.draw(View.java:16238) at android.view.View.updateDisplayListIfDirty(View.java:15235) at android.view.ViewGroup.recreateChildDisplayList(ViewGroup.java:3637) at android.view.ViewGroup.dispatchGetDisplayList(ViewGroup.java:3617) at android.view.View.updateDisplayListIfDirty(View.java:15195) at android.view.View.draw(View.java:16008) at android.view.ViewGroup.drawChild(ViewGroup.java:3653) at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3443) at android.view.View.updateDisplayListIfDirty(View.java:15230) at android.view.View.draw(View.java:16008) at android.view.ViewGroup.drawChild(ViewGroup.java:3653) at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3443) at android.view.View.updateDisplayListIfDirty(View.java:15230) at android.view.View.draw(View.java:16008) at android.view.ViewGroup.drawChild(ViewGroup.java:3653) at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3443) at android.view.View.updateDisplayListIfDirty(View.java:15230) at android.view.View.draw(View.java:16008) at android.view.ViewGroup.drawChild(ViewGroup.java:3653) at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3443) at android.view.View.updateDisplayListIfDirty(View.java:15230) at android.view.View.draw(View.java:16008) at android.view.ViewGroup.drawChild(ViewGroup.java:3653) at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3443) at android.view.View.updateDisplayListIfDirty(View.java:15230) at android.view.View.draw(View.java:16008) at android.view.ViewGroup.drawChild(ViewGroup.java:3653) at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3443) at android.view.View.draw(View.java:16241) at com.android.internal.policy.PhoneWindow$DecorView.draw(PhoneWindow.java:2709) at android.view.View.updateDisplayListIfDirty(View.java:15235) at android.view.ThreadedRenderer.updateViewTreeDisplayList(ThreadedRenderer.java:281) at android.view.ThreadedRenderer.updateRootDisplayList(ThreadedRenderer.java:287) at android.view.ThreadedRenderer.draw(ThreadedRenderer.java:322) at android.view.ViewRootImpl.draw(ViewRootImpl.java:2681) at android.view.ViewRootImpl.performDraw(ViewRootImpl.java:2495) at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2124) at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1140) at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6232) at android.view.Choreographer$CallbackRecord.run(Choreographer.java:858) at android.view.Choreographer.doCallbacks(Choreographer.java:670) at android.view.Choreographer.doFrame(Choreographer.java:606) at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:844) at android.os.Handler.handleCallback(Handler.java:739) at android.os.Handler.dispatchMessage(Handler.java:95) at android.os.Looper.loop(Looper.java:148) at android.app.ActivityThread.main(ActivityThread.java:5551) at java.lang.reflect.Method.invoke(Method.java) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:730) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:620)

Unfortunately, I do not have further information about the potential cause of this error. However, I already received multiple occurences of this bug in Crashlytics.

Any help is appreciated very much!

Source

Johnson145

👍4

Most helpful comment

I'm in the same case. I tried using the latest commit on the v3.1.0 but nothing changed.

Attempt to invoke virtual method 'java.lang.Object java.lang.ref.WeakReference.get()' on a null object reference at mikephil.charting.renderer.PieChartRenderer.drawExtras(PieChartRenderer.java:669)

bnoirant on 28 Jun 2019

👍6

All 18 comments

me too， What is your solution? @Johnson145

FlyInTheSkyToMe on 23 Oct 2017

Unfortunately, I don't have any solution yet. I was hoping to get some support here..

Johnson145 on 23 Oct 2017

This happens to me too on orientation change.

TonyNikolov on 29 Oct 2017

Anybody checked out #3207 ? I'm not sure whether it will fix this issue, too, but I'll give it a shot.

Johnson145 on 15 Nov 2017

Hi there, my PR will resolve this problem.

justindannguyen on 25 Nov 2017

Thanks for your help. However, I implemented a different solution in #3763 that covers more use cases and tries to fix the broken references.

Johnson145 on 29 Jan 2018

Thanks for your help. However, I implemented a different solution in #3763 that covers more use cases and tries to fix the broken references.

Excuse me, could you please explain how do I apply these changes with PirChartRenderer to my project? I am installing this library via gradle and I can't change source code. What sould I do ?

poyarkov95 on 21 Nov 2018

@poyarkov95 I don't think this hasn't been added yet. You have to manually download the repository from those pull requests into your android project to get the fixes. However I do hope to pull a fix soon into this main repository

almic on 24 Nov 2018

👍1

Hi @almic ,
Will the fix be pulled soon into the repository?
Thanks.

liorOrcam on 4 Feb 2019

👍1

I'm using the library v3.1.0 and I have the same problem! Any solution?

joaocamiloulhoa on 25 Jun 2019

I'm in the same case. I tried using the latest commit on the v3.1.0 but nothing changed.

Attempt to invoke virtual method 'java.lang.Object java.lang.ref.WeakReference.get()' on a null object reference at mikephil.charting.renderer.PieChartRenderer.drawExtras(PieChartRenderer.java:669)

bnoirant on 28 Jun 2019

👍6

I don't have this error anymore, so if it can help someone else:
It may be (I'm not sure) because I was trying to draw (at least change the parameters of) the pie chart before drawing the view.

bnoirant on 5 Jul 2019

👍1

Hi, thanks for the reply. I still have this error! Strange because it is only occurring on 1 smarthphone, all others work well! I'll test your tip !!

joaocamiloulhoa on 5 Jul 2019

Hi Guys,

I'm still facing the same bug on version v3.1.0. Any future version on roadmap to fix this problem?

mauriiciobarbosa on 4 Sep 2019

Hi Guys,

I'm Have This Error With SDK 22 or Less , But work Good on SDK 23 or High.

abdnezar on 3 Jul 2020

👎1

Did anyone find the solution to this problem?

AkshayChavan7 on 24 Aug 2020

@AkshayChavan7
As a workaround you can create custom view that extends PieChart and use this renderer.

class HackPieChartRenderer(
    chart: PieChart,
    animator: ChartAnimator,
    viewPortHandler: ViewPortHandler
) : PieChartRenderer(chart, animator, viewPortHandler) {

    override fun drawExtras(c: Canvas?) {
        if (mDrawBitmap != null) {
            super.drawExtras(c)
        }
    }
}

This works, because in my case bug was caused by view being 0dp tall. It was necessary for animation. And in that case mDrawBitmap doesn't get initialised, which makes sense. But drawExtras(...) still getting called.

GaidamakUA on 17 Sep 2020

👍4

Here the Java Version of @GaidamakUA's workaround.
Create the class WorkaroundPieChartRenderer:

class WorkaroundPieChartRenderer extends PieChartRenderer {

    public WorkaroundPieChartRenderer(PieChart chart, ChartAnimator animator, ViewPortHandler viewPortHandler) {
        super(chart, animator, viewPortHandler);
    }

    @Override
    public void drawExtras(Canvas c) {
        if (mDrawBitmap != null) {
            super.drawExtras(c);
        }
    }
}

Overwrite the Renderer as follows:

public class PieChartWithWorkaround extends PieChart {
    ...
    public PieChartWithWorkaround(Context context) {
        super(context);
        setRenderer(new WorkaroundPieChartRenderer(this,this.mAnimator,this.mViewPortHandler));
        ...
    }
}