– Very good speed and performance.

– Bonus goal is completed. However, data filters reset after zooming in and it's not possible to view the latest date (06.04.2019) on the pie chart.

– The third graph jitters when filtering Apples-Pears.

Good speed overall, but slow when filtering 'Apples' in graph #5 (maximum time range). Blinks when switching day/night mode.

Squire line caps, which is against design but increases performance. Some other apps may have a bit worse performance because they decided to follow designs exactly.

No white-to-transparent gradient at the top and bottom when graph is animating.

No selection circle on the yellow chart.

Pie issue - when opening 6 April, it displays only 3 days (3,4,5 april), So no 6 aprill at all, also the selected range in the center.

Sum is 99%

1. Sometimes horizontal axis lines count is less then 6 (must be always 6 by design).
2. Rectangle with values must overlap selection line when there is enough space to show both selection circles under the rectangle.
3. No texts animation.

Hello. I tested your app on 2 real devices. I found some 
issues:
1. The pie chart has wrong values/color and very strange animations (screenshot 1/ video1) - only on Innos d6000
2. When I rotate my device I can't see all values on the item label (screenshot 2 - all ok, screenshot 3 - problem)
3. Hard animation to change day/night mode. (video 2) - only on Innos d6000

Poor performance on chart #3

Recreate activity when switch color scheme

Date range blinking when scrolling

[+] nice performance. I think that this app should share at least 3rd place with other apps.

1. Small issue. date label at and of the chart does not align the chart end.

2. Date intersect dot is overlapped with line above. See Dreamy Griffin implementation (https://contest.dev/chart-android/entry50) (see screenshots - first yours, second - dreamy griffin)

3. Small Issue. Nice readability, but against design - line count is not constant. Always 6 in the video provided by telegram. As you can see from video there could be 3-6 lines. Also, in design bottom/first line always match chart drawing bottom

4. Small issue. While scrolling Y-scaled charts left y values are stable and changing when lines are changing, but right Y values have different logic - they stay on y lines, but their values are changing along with y height adjust animation. At least it looks weird.

5. Changes of date (day of the month, month, year) and y values/percent values in popup dialog and preview date range above chart does not animated.

[+] Nice animate dialog repositioning.

6. Preview zone control. When drag left a conrol edge to min-width then it begins to move the whole preview zone.
It not an issue and could be perceived as a positive feature or a negative feature.
[+] control of left and right zones could be started by touching anywhere to the left or right of available space, respectively
[-] left or right edge control should not (in my opinion) act like moving zone. For this user should touch the center (or somewhere between left and right control zones).

You should rather add pinch-to-zoom feature on preview widget as Dreamy Griffin (https://contest.dev/chart-android/entry50) did.

7. In zoom mode of pie chart, control area does not snap to days (width of preview area could be an, should be 1 day step). See telegram video again.

8. Pie chart flickering

No discrete range selector implemented

Stacked bar issue: when opening zoomed view, there is and timezone offset (especially noticeable for edge days like 6 April, but also noticeable for any other day - range selector not perfectly centered)