仅使用时间戳创建进度条？

Question

是否可以创建一个进度条，根据歌曲开始播放的时间以及歌曲的播放时长为歌曲的剩余时间设置动画？

例如，收集播放开始时间的 int，并再次比较以 ms 为单位的长度？

我理解这个概念，但无法在脑海中完全概括如何去做！

编辑：澄清一下，我可以获得剩余时间和开始时间的整数，但我不知道如何将它们组合成一个动画条，然后在 XML 中显示。

Answer 1

创建自定义动画进度条

public class AnimateProgressBar extends ProgressBar {

    private static final Interpolator DEFAULT_INTERPOLATER = new AccelerateDecelerateInterpolator();

    private ValueAnimator animator;
    private ValueAnimator animatorSecondary;
    private boolean animate = true;

    public AnimateProgressBar(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
    }

    public AnimateProgressBar(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public AnimateProgressBar(Context context) {
        super(context);
    }

    public boolean isAnimate() {
        return animate;
    }

    public void setAnimate(boolean animate) {
        this.animate = animate;
    }

    @Override
    public synchronized void setProgress(int progress) {
        if (!animate) {
            super.setProgress(progress);
            return;
        }
        if (animator != null)
            animator.cancel();
        if (animator == null) {
            animator = ValueAnimator.ofInt(getProgress(), progress);
            animator.setInterpolator(DEFAULT_INTERPOLATER);
            animator.addUpdateListener(new AnimatorUpdateListener() {
                @Override
                public void onAnimationUpdate(ValueAnimator animation) {
                    AnimateProgressBar.super.setProgress((Integer) animation.getAnimatedValue());
                }
            });
        } else
            animator.setIntValues(getProgress(), progress);
        animator.start();

    }

    @Override
    public synchronized void setSecondaryProgress(int secondaryProgress) {
        if (!animate) {
            super.setSecondaryProgress(secondaryProgress);
            return;
        }
        if (animatorSecondary != null)
            animatorSecondary.cancel();
        if (animatorSecondary == null) {
            animatorSecondary = ValueAnimator.ofInt(getProgress(), secondaryProgress);
            animatorSecondary.setInterpolator(DEFAULT_INTERPOLATER);
            animatorSecondary.addUpdateListener(new AnimatorUpdateListener() {
                @Override
                public void onAnimationUpdate(ValueAnimator animation) {
                    AnimateProgressBar.super.setSecondaryProgress((Integer) animation
                            .getAnimatedValue());
                }
            });
        } else
            animatorSecondary.setIntValues(getProgress(), secondaryProgress);
        animatorSecondary.start();
    }

    @Override
    protected void onDetachedFromWindow() {
        super.onDetachedFromWindow();
        if (animator != null)
            animator.cancel();
        if (animatorSecondary != null)
            animatorSecondary.cancel();
    }

}

在布局中

<FrameLayout
        android:id="@+id/progress_bar_frame"
        android:layout_below="@+id/appbar"
        android:layout_width="match_parent"
        android:layout_height="3dp">

        <my.gov.islam.smarthalal.ui.custom.AnimateProgressBar
            android:id="@+id/progress_bar"
            android:layout_width="match_parent"
            android:layout_height="8dp"
            style="?android:attr/progressBarStyleHorizontal"
            android:layout_marginTop="-3dp"
            android:layout_gravity="top"
            android:max="100"
            android:progressDrawable="@drawable/progress_bar_webview"
            android:background="@android:color/transparent"/>

    </FrameLayout>

在代码中，只设置歌曲时长的最大值，例如 currentTime/totaltime * 100

example : currentTime = 30 seconds
          totalTime = 280 seconds

progressBar.setMax(100); // set the maximum in persentage

then, in song callback method,

progressBar.setProgress(currentTime/280 * 100);