我正在视图持有者/适配器模式之后创建“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的时间更新每个网格单元.
我这样做的方法是通过从对象元素(文档)到相应的视图持有者的映射映射.我需要这样做,因为适配器正在循环使用单元格,所以有时我可以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.
我可以看到适配器的getView方法被多次调用为位置0.我一直在读这是正常的.
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一个UI元素是一个进度条,我通过将viewHolder添加到与文档关联的Map来跟踪.
除了第一个方法之外,这整个方法适用于所有位置.我可以识别的唯一区别是这些多次调用getView所以我从那里开始调试.我正在更新的progressBar是“progressBar 2”,这是geView膨胀的最新版本,但实际上它并没有响应setVisible(View.VISIBLE).然后我对代码进行了一些更改以更新“progressBar 1”并且它可以工作.
这意味着getView在同一位置膨胀两次,但第二次没有被使用或显示.
我能做错什么？为什么progressbar1工作而progressbar2没有？我希望getView会给我一个与位置相对应的最新视图.
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" />
解决方法
我在GridView中遇到了完全相同的问题.在单击列表的第一项时,它不会刷新.我只是改变了代码
public View getView(int position,ViewGroup parent)
{
View v = convertView;
if (convertView == null)
{
LayoutInflater vi = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
v = vi.inflate(R.layout.calendar_item,null);
}
.......
}
to
public View getView(int position,ViewGroup parent)
{
View v = convertView;
// if (convertView == null)
// {
LayoutInflater vi = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
v = vi.inflate(R.layout.calendar_item,null);
// }
.......
}
It is working fine to me.. But I don't have idea how it happens...
Any Clarification on this will be more helpful!!
