java 使进度栏更新平滑

kiz8lqtg  于 2023-03-11  发布在  Java
关注(0)|答案(6)|浏览(105)

我正在使用一个进度条(在酒吧的形式)。我希望使酒吧增加和减少顺利使用插值器,但它不工作。这是我目前所拥有的:

pb.setInterpolator(main.this, android.R.anim.bounce_interpolator);             
pb.setProgress(pb.getProgress()+10);

我真的做错什么了吗?

p5fdfcr1

p5fdfcr11#

插值器必须附加到动画,这将仅适用于Hive或更高版本:

if(android.os.Build.VERSION.SDK_INT >= 11){
    // will update the "progress" propriety of seekbar until it reaches progress
    ObjectAnimator animation = ObjectAnimator.ofInt(seekbar, "progress", progress); 
    animation.setDuration(500); // 0.5 second
    animation.setInterpolator(new DecelerateInterpolator());
    animation.start();
}
else 
    seekbar.setProgress(progress); // no animation on Gingerbread or lower

如果您的最低SDK是Gingerbread或更低版本,请添加:

@TargetApi(Build.VERSION_CODES.HONEYCOMB) 
// or 
@SuppressLint("NewApi")

到您的函数/类。
我使用了减速插值器,但这是可选的,还有其他可能性。

yhived7q

yhived7q2#

下面是一个独立的解决方案:

import android.animation.ValueAnimator;
import android.animation.ValueAnimator.AnimatorUpdateListener;
import android.content.Context;
import android.util.AttributeSet;
import android.view.animation.AccelerateDecelerateInterpolator;
import android.view.animation.Interpolator;
import android.widget.ProgressBar;

public class AnimatingProgressBar extends ProgressBar {

    private static final Interpolator DEFAULT_INTERPOLATER = new AccelerateDecelerateInterpolator();

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

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

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

    public AnimatingProgressBar(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) {
                    AnimatingProgressBar.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) {
                    AnimatingProgressBar.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();
    }

}

在布局中将ProgressBar替换为AnimatingProgressBar
您还可以将类型更改为AnimatingProgressBar,以利用setAnimate()禁用动画(在恢复活动状态时可能很有用)

kqhtkvqz

kqhtkvqz3#

如果你每次改变进度值1(例如从45到46),你将看不到动画。最好改变进度100点,为此你只需要把你的最大值乘以100,每个进度值也乘以100。例如:

private void setProgressMax(ProgressBar pb, int max) {
    pb.setMax(max * 100);
}

private void setProgressAnimate(ProgressBar pb, int progressTo) 
{
    ObjectAnimator animation = ObjectAnimator.ofInt(pb, "progress", pb.getProgress(), progressTo * 100);
    animation.setDuration(500);
    animation.setInterpolator(new DecelerateInterpolator());
    animation.start();
}
4ktjp1zp

4ktjp1zp4#

我想出了如何做到这一点,通过使用一个runnable我能够更新进度条几次一秒钟,所以给予滑动效果。代码如下:

private Runnable SmoothIncrement = new Runnable() {
       public void run() {
           final long start = mStartTime;
           long millis = SystemClock.uptimeMillis() - start;

           if(track!=increase) {
               if((pb.getProgress()==100)&&(count<target)) {
                   pb.setProgress(0);
               }
               pb.incrementProgressBy(1);
               track++;
               incrementor.postAtTime(this, start + millis);
           }
           else {
               incrementor.removeCallbacks(this);
           }
       }
    };

在这里,“track”跟踪已经完成了多少增量,increase是应该完成的增量的总数。我可以从UI线程动态增加增量的数量,以给予平滑的效果。该代码只适用于不需要减少的进度条。
要运行它,只需使用以下代码:

mStartTime = System.currentTimeMillis();
                    incrementor.removeCallbacks(SmoothIncrement);
                    if(track!=0) {
                        track -= increase;
                    }
                    incrementor.postDelayed(SmoothIncrement, 0);
juud5qan

juud5qan5#

根据文档,内插器适用于不确定的进度。既然你设置了进度,我想你打算使用有值的常规进度。我想对你来说最好的是增加进度的最大值,并以较小的增量进行。

oxosxuxt

oxosxuxt6#

我不确定,但请检查:

pb.setProgress(pb.getProgress() * 100);

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