(There was a post on the forum about the histogram. After reading it, I didn't understand it, and there was no effect map. I copied the code into Eclipse completely. It was difficult to debug... So I wrote a very simple Demo
BarChart\bin\cn\knight\barchart\Chart.class
BarChart\bin\cn\knight\barchart\ChartView.class
BarChart\bin\cn\knight\barchart\Main.class
BarChart\bin\cn\knight\barchart\R$attr.class
BarChart\bin\cn\knight\barchart\R$drawable.class
BarChart\bin\cn\knight\barchart\R$id.class
BarChart\bin\cn\knight\barchart\R$layout.class
BarChart\bin\cn\knight\barchart\R$string.class
BarChart\bin\cn\knight\barchart\R.class
BarChart\bin\BarChart.apk
BarChart\bin\classes.dex
BarChart\bin\resources.ap_
BarChart\gen\cn\knight\barchart\R.java
BarChart\res\drawable-mdpi\icon.ico
BarChart\res\layout\main.xml
BarChart\res\values\strings.xml
BarChart\src\cn\knight\barchart\Chart.java
BarChart\src\cn\knight\barchart\ChartView.java
BarChart\src\cn\knight\barchart\Main.java
BarChart\.classpath
BarChart\.project
BarChart\AndroidManifest.xml
BarChart\default.properties
BarChart\proguard.cfg)