ringa_lee2017-04-17 13:00:48
There are many. If the question owner only needs what is in the question, it is very simple to write it yourself. Just customize a View to draw the values in the array/list on the screen in sequence.
If you have other needs, check out this open source project compiled by Trinea:
MPAndroidChart
Powerful chart drawing tools, supporting line charts, area charts, scatter charts, time charts, column charts, bar charts, pie charts, bubble charts, donut charts, range (high to low) bar charts, network charts, and Combination of various graphs; supports drag and drop of graphs; supports Android 2.2 and above, supports horizontal and vertical axis scaling, multi-finger zooming, animation, highlighting, saving to sdcard, and reading charts from files
Project address: https://github.com/PhilJay/MPAndroidChart
Demo address: https://play.google.com/store/apps/details?id=com.xxmassdeveloper.mpchartexample
Demo project: https://github.com/PhilJay/MPAndroidChart/tree/master/MPChartExample
Rendering: 
Online demonstration: https://www.youtube.com/watch?v=ufaK_Hd6BpI
achartengine
Powerful chart drawing tools, supporting line charts, area charts, scatter charts, time charts, column charts, bar charts, pie charts, bubble charts, donut charts, range (high to low) bar charts, dial charts/tables , cubic line chart and combination of various charts
Project address: https://code.google.com/p/achartengine/
Rendering: 
http://www.achartengine.org/dimages/sales_line_and_area_chart.png
http://www.achartengine.org/dimages/temperature_range_chart.png
http://www.achartengine.org/dimages/combined_chart.png
http://www.achartengine.org/dimages/budget_chart.png
Official website: http://www.achartengine.org/
APP examples: WordPress Android, Google Analytics
GraphView
View for drawing charts and graphs, which can be used to display curved graphs, bar graphs, and wave graphs on Android
Project address: https://github.com/jjoe64/GraphView
Demo project: https://github.com/jjoe64/GraphView-Demos
APP examples: WordPress Android, Google Analytics
HoloGraphLibrary
Draw status diagrams, bar charts, and pie charts
Project address: https://bitbucket.org/danielnadeau/holographlibrary/src
Document introduction: https://bitbucket.org/danielnadeau/holographlibrary/wiki/Home
XCL-Charts
XCL-Charts draws various charts based on the native Canvas. When designing, we try our best to provide users with sufficient customization capabilities while ensuring development efficiency. It is therefore easy to use and has quite flexible customization capabilities. Currently supports 3D/non-3D column chart (Bar Chart), 3D/non-3D pie chart (Pie Chart), stacked bar chart (Stacked Bar Chart), area chart (Area Chart), line chart (Line Chart), Spline Chart, Donut Chart, Nightingale Rose Chart, Dial Chart, Gauge Chart, Radar Chart, Circle Chart ( Circle Chart) and other charts. Other features include support for chart scaling, gesture movement, animation display effects, high-density column display, customized chart demarcation lines, mixed display of multiple charts, and switching between different types of charts from the same data source.
Project address: https://github.com/xcltapestry/XCL-Charts
Demo address: https://github.com/xcltapestry/XCL-Charts/blob/master/XCL-Charts-demo/bin/XCL-Charts-demo.apk?raw=true
EazeGraph
Android chart library, supports bar charts, hierarchical bar charts, pie charts, linear charts
Project address: https://github.com/blackfizz/EazeGraph
Demo address: https://play.google.com/store/apps/details?id=org.eazegraph.app
WilliamChart
A library for drawing charts that supports three chart types: LineChartView, BarChartView and StackBarChartView, and supports Android 2.2 and above systems.
Project address: https://github.com/diogobernardino/WilliamChart
Demo address: https://play.google.com/store/apps/details?id=com.db.williamchartdemo
Demo project: https://github.com/diogobernardino/WilliamChart/tree/master/sample
Rendering: 
HelloCharts for Android
Supports line charts, bar charts, pie charts, bubble charts, and combination charts; supports preview, zoom in, and scroll, and some charts support animation; supports Android 2.2 and above
Project address: https://github.com/lecho/hellocharts-android
Demo address: https://play.google.com/store/apps/details?id=lecho.lib.hellocharts.samples
Online demonstration: https://www.youtube.com/watch?v=xbSBjyjH2SY
怪我咯2017-04-17 13:00:48
Html5 is not required, usually you draw directly on the canvas.
There are also many mature chart libraries..
Just list 2:
XCL-Charts
https://github.com/xcltapestry/XCL-Charts
MPAndroidChart
https://github.com/PhilJay/MPAndroidChart
PHP中文网2017-04-17 13:00:48
There are some open source tools. If you want to implement it yourself, you can use the tools provided by the android.graphics package to draw.
The key is to define several classes like this:
1. Represents the data model of each discount, which can add, delete, modify and check the data. This part is mainly about designing the data structure
2. The polyline drawing class contains a draw(Canvas canvas, Paint paint) method, and the drawing is completed within the method
3. The data model of the chart includes references to the polyline to be drawn, as well as some coordinate system attributes, etc.
4. Customize the View to present the above icon, rewrite the onDraw(Canvas canvas) method, and call the draw method of each polyline one by one in this method
1 and 2, and 3 and 4 can be combined and defined as one class, which not only manages data, but also contains a method responsible for drawing.
The specific implementation is more complicated than the above, but the general idea is this.
