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MPAndroidChart
A powerful 🚀 Android chart view / graph view library, supporting line- bar- pie- radar- bubble- and candlestick charts as well as scaling, panning and animations.
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
I am planning to use a charting/graphing library in my App, however I have noticed that the options are pretty limited. In particular it seem like that there are many mediocre libraries and the rather promising ones (i.e. https://github.com/PhilJay/MPAndroidChart) are no longer maintained. In other words I couldn't find a framework that is both good and actively maintained.
Highcharts is great. It's in JS but it can be somewhat usable on Android (probably if charts are not the centerpiece of your app): https://github.com/highcharts/highcharts-android