Android move object along a path

Question

I ave created a path a circle and displayed both of them on screen as follows:

public void onDraw(Canvas canvas){

        Path sPath = new Path();
        s         


        

Answer 1

Yes, it's possible to move image along path. I will provide simple solution to show the principle. The following code will animate the circle along the path.

int iCurStep = 0;// current animation step

@Override
protected void onDraw(Canvas canvas) {
    PathMeasure pm = new PathMeasure(sPath, false);
    float fSegmentLen = pm.getLength() / 20;//we'll get 20 points from path to animate the circle
    float afP[] = {0f, 0f};

    if (iCurStep <= 20) {
        pm.getPosTan(fSegmentLen * iCurStep, afP, null);
        canvas.drawCircle(afP[0],afP[1],20,pathPaint);
        iCurStep++;
        invalidate();
    } else {
        iCurStep = 0;
    };
};