"UI" Android how to draw a pie chart

Code download

Demand

1: Solid pie chart, color fill percent area

2: With area description

3: Pie chart has a shadow

Idea: This is actually the same as the drawing progress bar principle, are 360 degrees according to the percentage of the drawing radians, and then call the canvas arc function.

The shadow is actually a hollow circle, using the native radialgradient circular gradient, the color from black to transparent, to achieve the shadow effect.

The right rounded square is the new Drawroundrect function introduced in Android 5.0. Draw Square below Android 5.0

"UI" Android how to draw a pie chart