如何在列表视图中显示淡入淡出效果的图像？

Question

如何在列表视图中显示具有淡入淡出效果的图像（我不知道确切的名称），就像应用程序在做的那样。 https://play.google.com/store/apps/details?id=com.yummly.android 对此类库或有用资源的任何引用？

Answer 1

你可以用这个例子

在适配器（扩大BaseAdapter或ArrayAdapter）：

private int lastPosition = -1; 

@Override 
public View getView(int position, View convertView, ViewGroup parent) { 
    //.....inflating and bind view 

    setAnimation(convertView, position); 
    return convertView; 
} 


/** 
* Here is the key method to apply the animation 
*/ 
private void setAnimation(View viewToAnimate, int position) { 
    // If the bound view wasn't previously displayed on screen, it's animated 
    if (position > lastPosition) { 
     Animation animation = AnimationUtils.loadAnimation(mContext, android.R.anim.fade_in); 
     viewToAnimate.startAnimation(animation); 
     lastPosition = position; 
    } 
} 

或为RecyclerView.Adapter：

@Override 
public void onBindViewHolder(final HistoryHolder holder, final int position) { 
.... 
setAnimation(holder.animatedView, position); 
}