🎵🎵🎵 许多音乐App上常见的音频可视化效果，读取音频数据并利用傅里叶转换成可视化的字节数据，再通过自定义View渲染而成。An audio visualization effect like many music app, read audio data and use Fourier transform to visual byte data, and then through custom view rendering.
Fix：abs for fft data