How to count the Framerate with which a SurfaceView refreshes?

Question

I have a third party framework that shows video on a SurfaceView. I would like to measure the framerate of the video to check if the phone is capable of showing the video fast e

Answer 1

If the code is not clear just ask.

LinkedList times = new LinkedList(){{
    add(System.nanoTime());
}};

@Override
protected void onDraw(Canvas canvas) {
    double fps = fps();
    // ...
    super.onDraw(canvas);
}

private final int MAX_SIZE = 100;
private final double NANOS = 1000000000.0;

/** Calculates and returns frames per second */
private double fps() {
    long lastTime = System.nanoTime();
    double difference = (lastTime - times.getFirst()) / NANOS;
    times.addLast(lastTime);
    int size = times.size();
    if (size > MAX_SIZE) {
        times.removeFirst();
    }
    return difference > 0 ? times.size() / difference : 0.0;
}