Android实现简单水波纹效果

public class WaveView extends View {
  private Paint mPaint;
  private final Path mPath;
  //波长
  private int wavelength = 500;
  private int originY=800;
  private int dx,dy;
 
  public WaveView(Context context, @Nullable AttributeSet attrs) {
    super(context, attrs);
    mPaint = new Paint();
    mPath = new Path();
    mPaint.setColor(Color.GREEN);
    mPaint.setStrokeWidth(5);
    mPaint.setStyle(Paint.Style.FILL_AND_STROKE);
//    startanimation();
  }
 
 
  @Override
  protected void onDraw(Canvas canvas) {
    super.onDraw(canvas);
    //重置path
    mPath.reset();
//    改变y的起始坐标
    if(dy