在android中的listview滚动上设置动画

Question

当用户滚动ListView 时，我想为ListView 设置动画。我在加载时为ListView 设置动画，但我想为滚动设置动画。

这是我在 eclipse 中的动画文件：

<?xml version="1.0" encoding="utf-8"?>
<translate xmlns:android="schemas.android.com/apk/res/android";   
    android:duration="900" android:fromXDelta="-100%p" 
    android:interpolator="@android:anim/linear_interpolator" 
    android:repeatCount="0" android:repeatMode="reverse" 
    android:fillEnabled="true" android:fillAfter="true" android:toXDelta="0%p" >
</translate>

此代码设置项目到我的列表视图：

@Override public View getView(int position, View convertView, ViewGroup parent) {
    ViewHolder holder;
    StructNote item = getItem(position);
    if (convertView == null) {
        convertView = G.inflater.inflate(R.layout.adapter_notes, parent, false);
        holder = new ViewHolder(convertView);
        convertView.setTag(holder);
    } else {
        holder = (ViewHolder) convertView.getTag();
    }
    holder.fill(this, item, position); return convertView;
}

这是一个将动画设置为列表视图的 ActivityMain

ListView lstContent = (ListView) findViewById(R.id.lstContent);
Animation animation = AnimationUtils.loadAnimation(this, R.anim.translate);    
lstContent.setLayoutAnimation(new LayoutAnimationController(animation));

谁能帮帮我？？

Answer 1

ListView 适配器：

Animation scaleUp;

 public MyAdapter(...) {
           //...
     scaleUp = AnimationUtils.loadAnimation(activity, R.anim.scale_up_fast);
 }

 public View getView(final int position, View convertView, ViewGroup parent) {

    CardView cv;

    if (convertView == null){
      inflater = (LayoutInflater) activity.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
      convertView = inflater.inflate(R.layout.your_layout, parent, false);
    }
    cv = (CardView) convertView.findById(R.id.yourView);//Change this to your view      
    cv.startAnimation(scaleUp);
 }

动画：

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android" >

    <scale
        android:duration="300"
        android:fromXScale="0"
        android:fromYScale="0"
        android:pivotX="50%"
        android:pivotY="50%"
        android:toXScale="1"
        android:toYScale="1" />
</set>

Answer 2

有很多方法可以完成这种任务，我建议您知道示例，您可以创建自己的动画，也可以为此使用预定义库。 example 1,Some listview which have effects extra than the listview widget

Answer 3

首先从动画 xml 中删除 semicolon(;) 然后我看到了像这个应用程序这样的滚动动画https://play.google.com/store/apps/details?id=com.nilstechsys.myquotes

这是一个简单的listview adpter中的滚动动画代码

 Animation animation = null;
        animation = new TranslateAnimation(metrics_.widthPixels / 2, 0, 0, 0);
        //animation = AnimationUtils.loadAnimation(activity, R.anim.your_animation);
        animation.setDuration(400);
        convertView.startAnimation(animation);
        animation = null;

Answer 4

这是我可以根据您的要求为您提供的最佳解决方案！请通过此适配器一次。

 public class MyAdapter extends ArrayAdapter<String>{

            private int mLastPosition;

            public MyAdapter(Context context, ArrayList<String> objects) {
                super(context, 0, objects);
            }

            private class ViewHolder{
                public TextView mTextView;
            }

            @TargetApi(Build.VERSION_CODES.HONEYCOMB_MR1)
            @Override
            public View getView(int position, View convertView, ViewGroup parent) {

                ViewHolder holder;

                if (convertView == null) {
                    holder = new ViewHolder();
                    convertView = LayoutInflater.from(getContext()).inflate(R.layout.grid_item, parent, false);
                    holder.mTextView = (TextView) convertView.findViewById(R.id.checkbox);
                    convertView.setTag(holder);
                } else {
                    holder = (ViewHolder) convertView.getTag();
                }

                holder.mTextView.setText(getItem(position));

                // This tells the view where to start based on the direction of the scroll.
                // If the last position to be loaded is <= the current position, we want
                // the views to start below their ending point (500f further down).
                // Otherwise, we start above the ending point.
                float initialTranslation = (mLastPosition <= position ? 500f : -500f);

                convertView.setTranslationY(initialTranslation);
                convertView.animate()
                        .setInterpolator(new DecelerateInterpolator(1.0f))
                        .translationY(0f)
                        .setDuration(300l)
                        .setListener(null);

                // Keep track of the last position we loaded
                mLastPosition = position;

                return convertView;
            }


        }

Answer 5

列表视图滚动的简单而美妙的动画

 @Override`
public View getView(final int i, View view, ViewGroup viewGroup) {
    View converview = view;`
// other coding related to view

    if (animateOrNot) {    //boolean if want to animate
        doCards(converview, i, prevPos);}
       `prevPos=i; //take prevPos as global variable of int
    return converview;
}`



    public static void doCards(View view, int position, int prevPosition) {
    view.setScaleX(0.5f);
    if (position > prevPosition) {
        view.setRotationX(90);
    } else {
        view.setRotationX(-90);
    }
    view.animate().rotationX(0).scaleX(1.0f).start();
}