Question

What algorithm or technique should I use to make an object follow the path that the user’s drawing on the screen?

Answer 1

The below example creates a PATH for displying TEXT on Circle Path:

// create a path
Path circle = new Path();
circle.addCircle(centerX, centerY, radius, Direction.CW);

// set the color and font size
Paint paint = new Paint();
paint.setColor(Color.BLUE);
paint.setTextSize(30);
paint.setAntiAlias(true);

// draw the text along the circle
canvas.drawTextOnPath(QUOTE, circle, 0, 30, paint);

You can refer full Example Here

And For Animation, There are mainly 4 Types of Animations comes up with Android SDK:

1. AlphaAnimation – transparency changes
2. RotateAnimation – rotations
3. ScaleAnimation – growing or shrinking
4. TranslateAnimation – position changes

For CREATING ANIMATION SEQUENCES, refer Example Here.

For Different Types of Animations Example such as Frame Animation (As in Flash), List Animation,etc. You can refer Animations Types EXample here .

Enjoy!!