Animate ProgressBar update in Android

Question

I am using a ProgressBar in my application which I update in onProgressUpdate of an AsyncTask. So far so good.

What I want to do is to animate the prog

Answer 1

My solution with custom ProgressBar. You can specify animation (animationLength) legth and "smoothness" (animationSmoothness) using attributes (when you use it in XML layout)

AnimatedProgressBar.java

public class AnimatedProgressBar extends ProgressBar {
private static final String TAG = "AnimatedProgressBar";

private static final int BASE_ANIMATION_DURATION = 1000;
private static final int BASE_PROGRESS_SMOOTHNESS = 50;

private int animationDuration = BASE_ANIMATION_DURATION;
private int animationSmoothness = BASE_PROGRESS_SMOOTHNESS;

public AnimatedProgressBar(Context context) {
    super(context);
    init();
}

public AnimatedProgressBar(Context context, AttributeSet attrs) {
    super(context, attrs);
    obtainAnimationAttributes(attrs);
    init();
}

public AnimatedProgressBar(Context context, AttributeSet attrs, int theme) {
    super(context, attrs, theme);
    obtainAnimationAttributes(attrs);
    init();
}

private void obtainAnimationAttributes(AttributeSet attrs) {
    for(int i = 0; i < attrs.getAttributeCount(); i++) {
        String name = attrs.getAttributeName(i);

        if (name.equals("animationDuration")) {
            animationDuration = attrs.getAttributeIntValue(i, BASE_ANIMATION_DURATION);
        } else if (name.equals("animationSmoothness")) {
            animationSmoothness = attrs.getAttributeIntValue(i, BASE_PROGRESS_SMOOTHNESS);
        }
    }
}

private void init() {

}

@Override
public synchronized void setMax(int max) {
    super.setMax(max * animationSmoothness);
}

public void makeProgress(int progress) {
    ObjectAnimator objectAnimator = ObjectAnimator.ofInt(this, "progress", progress * animationSmoothness);
    objectAnimator.setDuration(animationDuration);
    objectAnimator.setInterpolator(new DecelerateInterpolator());
    objectAnimator.start();
}}

values/attrs.xml: