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Charting library for Android compatible with API 8+(Android 2.2).

There is a newer version: 1.5.8

package lecho.lib.hellocharts.animation;

import android.os.Handler;
import android.os.SystemClock;
import android.view.animation.AccelerateDecelerateInterpolator;
import android.view.animation.Interpolator;

import lecho.lib.hellocharts.view.Chart;

public class ChartDataAnimatorV8 implements ChartDataAnimator {

    long start;
    boolean isAnimationStarted = false;
    long duration;
    final Chart chart;
    final Handler handler;
    final Interpolator interpolator = new AccelerateDecelerateInterpolator();
    private ChartAnimationListener animationListener = new DummyChartAnimationListener();
    private final Runnable runnable = new Runnable() {

        @Override
        public void run() {
            long elapsed = SystemClock.uptimeMillis() - start;
            if (elapsed > duration) {
                isAnimationStarted = false;
                handler.removeCallbacks(runnable);
                chart.animationDataFinished();
                return;
            }
            float scale = Math.min(interpolator.getInterpolation((float) elapsed / duration), 1);
            chart.animationDataUpdate(scale);
            handler.postDelayed(this, 16);

        }
    };

    public ChartDataAnimatorV8(Chart chart) {
        this.chart = chart;
        this.handler = new Handler();
    }

    @Override
    public void startAnimation(long duration) {
        if (duration >= 0) {
            this.duration = duration;
        } else {
            this.duration = DEFAULT_ANIMATION_DURATION;
        }

        isAnimationStarted = true;
        animationListener.onAnimationStarted();
        start = SystemClock.uptimeMillis();
        handler.post(runnable);
    }

    @Override
    public void cancelAnimation() {
        isAnimationStarted = false;
        handler.removeCallbacks(runnable);
        chart.animationDataFinished();
        animationListener.onAnimationFinished();
    }

    @Override
    public boolean isAnimationStarted() {
        return isAnimationStarted;
    }

    @Override
    public void setChartAnimationListener(ChartAnimationListener animationListener) {
        if (null == animationListener) {
            this.animationListener = new DummyChartAnimationListener();
        } else {
            this.animationListener = animationListener;
        }
    }
}