Realization of radar effect based on Android custom control

How to make an effect similar to radar scanning, the specific methods are as follows

1、 Renderings

2、 Realization idea

1. The custom control radarview is used to draw radar renderings. You can customize the properties, including

BackgroundColor: background color circlenum: number of circles startcolor: start color endcolor: end color linecolor: line color

2. Send a message to the messagequeue through the handler loop, add mrotate by 3, make the matrix rotate mrotate, and redraw the circle scanned by the radar.

3. With the gradient sweep renderer sweepgradient, the color changes from startcolor to endcolor as you draw the circle.

3、 Example code

Layout file:

The above is the whole content of this article. I hope it will be helpful to your study, and I hope you can support programming tips.