我正在按照视图持有者/适配器模式创建“文档”的网格视图。在活动中，我从网络类中获得回调，因此我需要能够在不同时间更新每个网格单元。
我这样做的方式是通过从对象元素（文档）到相应的视图持有者的 Map 映射。我需要这样做，因为适配器正在回收单元格，所以有时我会收到一个回调来更新一个不可见的单元格，在这种情况下，回调信息将被忽略。
我可以看到，getView对于位置 0，适配器的方法以这种方式被调用了很多次。我一直在读到这是正常的。
inflating position 0 *** progressBar 1
recycling position 0
recycling position 0
inflating position 0 *** progressBar 2
recycling position 0
recycling position 0
recycling position 0
recycling position 0
recycling position 0
recycling position 0
我需要从回调中更新的元素之一是进度条，我通过添加到与文档关联的 Map 来UI跟踪它。viewHolder
整个方法适用于除第一个位置之外的所有位置。我能确定的唯一区别是这些多次调用，getView所以我从那里开始调试。progressBar我正在更新的是“ 2 progressBar”，这是最新的geView膨胀但实际上它不响应setVisible（View.VISIBLE）。然后我对代码进行了一些更改以更新“ progressBar1”并且它可以工作。
这意味着getView在同一位置充气两次，但第二次没有被使用或显示。
我可能做错了什么？为什么progressbar1 有效而progressbar2 无效？我希望这getView会给我与职位相对应的最新观点。
谢谢。
适配器：
public class DocumentPickerGridViewAdapter extends ArrayAdapter<Document> implements Filterable {
private final DocumentPickerGridViewController picker;
private ArrayList values;
private ArrayList filtered;
private LayoutInflater inflater;
public DocumentPickerGridViewAdapter(Context context, ArrayList values) {
super(context, R.id.documentPickerGridView, values);
this.picker = (DocumentPickerGridViewController) context;
this.filtered = values;
this.values = (ArrayList)values.clone();
inflater = (LayoutInflater) picker.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View v = convertView;
ViewHolder oldHolder;
ViewHolder holder;
Document doc = (Document) filtered.get(position);
if (v == null) {
v = inflater.inflate(R.layout.documentpickergriditem, parent, false);
holder = new ViewHolder();
holder.actionView = (Button) v.findViewById(R.id.document_action_button);
holder.coverView = (ImageView) v.findViewById(R.id.documentCoverImage);
holder.archiveButton = (Button) v.findViewById(R.id.document_archive_button);
holder.progressView = (ProgressView) v.findViewById(R.id.documentProgress);
holder.progressBar = (ProgressBar) v.findViewById(R.id.documentCoverImageProgressBar);
picker.allProgressViews.add(holder);
Log.d("MARIANO","adding to allProgressViews "+holder.progressView);
Log.d("MARIANO","inflating position "+position);
v.setTag(holder);
}
else{
// here we are recycling, we should clean old stuff.
holder = (ViewHolder)v.getTag();
synchronized (picker){
oldHolder = picker.documentHoldersMap.get(holder.doc);
}
if(oldHolder != null){
oldHolder.progressView.setVisibility(View.GONE);
oldHolder.progressBar.setVisibility(View.GONE);
}
// Document associated with previous holder it's now out of the adapter visible window.
// we have to remove it from the map so if picker receives any call back we won't update anything.
if(! holder.doc.uuid().equals(doc)){
synchronized (picker){
picker.documentHoldersMap.remove(holder.doc);
}
}
}
holder.doc = doc;
holder.position = position;
synchronized (picker){
picker.documentHoldersMap.put(doc,holder);
}
/*
TODO: check why view extendedGrid starts to measure the size of the grid after gridpicker view has disapear. This causes a ArrayOutofIndexes
exception. DocumentGridPicker view does setDocuments(null); which clears all arrays, but the adapter stays setting as many cells as before.
https://kaldorgroup.jira.com/browse/NEWSWEEK-49
*/
if(picker.documents() != null && picker.documents().size() > 0 ){
picker.setCoverView(holder.coverView, doc);
picker.setActionButton(holder.actionView, doc);
picker.setArchiveButton(holder.archiveButton, doc);
picker.refreshButton(doc);
}
TextView textView = (TextView) v.findViewById(R.id.documentName);
textView.setText(doc.name());
if(position == 0)
Log.d("MARIANO", "progressView: "+holder.progressView);
return v;
}
@Override
public Filter getFilter() {
return new Filter() {
@Override
protected FilterResults performFiltering(CharSequence constraint) {
FilterResults result = new FilterResults();
if (constraint.equals(DocumentPickerGridViewController.FILTER_DOWNLOADED)) {
ArrayList items = new ArrayList();
synchronized (this) {
items.addAll(values);
}
for (int i = items.size() - 1; i >= 0; i--) {
if (((Document) items.get(i)).state() != DocumentStates.Downloaded)
items.remove(i);
}
result.count = items.size();
result.values = items;
} else { // ALL ITEMS
synchronized (this) {
result.count = values.size();
result.values = values;
}
}
return result;
}
@SuppressWarnings("unchecked")
@Override
protected void publishResults(CharSequence constraint, FilterResults results) {
filtered = (ArrayList)results.values;
DocumentPickerGridViewAdapter.this.notifyDataSetChanged();
clear();
for(int i = 0, l = filtered.size(); i < l; i++)
add((Document)filtered.get(i));
notifyDataSetInvalidated();
}
};
}
static class ViewHolder{
ImageView coverView;
Button actionView;
Button archiveButton;
ProgressView progressView;
ProgressBar progressBar;
int position;
Document doc;
}
}
网格视图 ：
<com.kaldorgroup.newsweek.ExpandableGridView
android:id="@+id/documentPickerGridView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:columnWidth="150dp"
android:numColumns="auto_fit"
android:horizontalSpacing="25dp"
android:stretchMode="spacingWidth"
android:verticalSpacing="20dp"
android:layout_marginTop="10dp"
android:layout_marginBottom="5dp"
android:layout_marginLeft="15dp"
android:layout_marginRight="15dp"
android:isScrollContainer="false"
android:paddingTop="350dp" />