I received an answer. For this and below: -
The problem is with slicespace --> pieDataSet.setSliceSpace(...)
If the "size" of the slice exceeds the size of the slice of the cake, this problem occurs. I suggest you remove the slice space if you have very small fragments.
You can delete this line
or
Set---> dataSet.setSliceSpace(0.05f);
Instead
Set
EDIT: This issue was subsequently fixed in commit 95dd249 . This should no longer be a problem if you are using the latest version of MPAndroidChart
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