Question

如何正确创建动画（在listview中）？

我有这段代码：

public void blink(final View v)
{
    final Animation animation = new AlphaAnimation(1, 0);
    animation.setDuration(500);
    animation.setInterpolator(new LinearInterpolator());
    animation.setRepeatCount(Animation.INFINITE);
    animation.setRepeatMode(Animation.REVERSE);

    v.startAnimation(animation);

    new Thread(new Runnable()
    {
        @Override
        public void run()
        {
            try { Thread.sleep(2000); }
            catch (InterruptedException e) { e.printStackTrace(); }

            v.clearAnimation();
        }
    }).start();
}

View在“getView”函数（ArrayListAdapter）中动画：

if(!alarm.isAnimated())
{
    blink(view);
    alarm.setAnimated(true);
}

这非常好用，但我需要经常更新视图，每次更新都会取消动画...

notifyDataSetChanged(); // calls getView, isAnimated = true, animation is canceled

而且我也不想重置动画（它可能会在中间结束而且看起来不太好）而且我也想在我将项目添加到列表视图时（而不是在更新时）进行动画处理。

感谢您的帮助。

编辑：

整个适配器：

public class AlertListAdapter extends ArrayAdapter<AlarmEntity>
{
    private ArrayList<AlarmEntity> data;

    public AlertListAdapter(Context context, ArrayList<AlarmEntity> data)
    {
        super(context, android.R.layout.simple_list_item_2, data);
        this.data = (data);
    }

    @NonNull
    @Override
    public View getView(int position, View convertView, @NonNull ViewGroup parent)
    {
        LayoutInflater inflater = LayoutInflater.from(getContext());
        @SuppressLint("ViewHolder") View view = inflater.inflate(R.layout.alert_row, parent, false);

        return getView(getItem(position), view);
    }

    private View getView(AlarmEntity alarm, View view)
    {
        if(!alarm.isAnimated())
        {
            blink(view);
            alarm.setAnimated(true);
        }

        return (view);
    }

    public void update()
    {
        for(AlarmEntity e : data)
            e.setDistance(Coords.getDistance(CarEntity.location, e.getLocation()));

        notifyDataSetChanged();
    }

    public void blink(final View v)
    {
        final Animation animation = new AlphaAnimation(1, 0);
        animation.setDuration(500);
        animation.setInterpolator(new LinearInterpolator());
        animation.setRepeatCount(Animation.INFINITE);
        animation.setRepeatMode(Animation.REVERSE);

        v.startAnimation(animation);

        new Thread(new Runnable()
        {
            @Override
            public void run()
            {
                try { Thread.sleep(2000); }
                catch (InterruptedException e) { e.printStackTrace(); }

                v.clearAnimation();
            }
        }).start();
    }
}

Answer 1

最简单的方法是不使用长时间动画将单元格添加到ListView中。 :-D

public void pushIn(final View v)
{
    Animation animation = AnimationUtils.loadAnimation(MainActivity.getContext(), R.anim.push_left_anim);
    animation.setDuration(500);
    v.startAnimation(animation);
}

它看起来比眨眼更好:-D

    <set xmlns:android="http://schemas.android.com/apk/res/android">
   <translate android:fromXDelta="100%p" android:toXDelta="0"
         android:duration="300"/>
   <alpha android:fromAlpha="0.0" android:toAlpha="1.0"
         android:duration="300" />
</set>

ArrayListAdapter - ListView动画

1 个答案: