具有多种视图类型的ListView回收 [英] ListView recycling with multiple types of views
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问题描述
我目前正在使用一个非常简单的ListView进行工作,该视图最多具有2种不同的视图类型.为了也使一切顺利,我尝试回收视图.到目前为止,我的代码是:
I'm currently working on a quite simply ListView with up to 2 different view types. In order too make everything smooth i try to recycle views. My code is by now:
@Override
public int getItemViewType (int position){
if(mHasBefore&&position==0){
return TYPE_PAGER;
}else if(mHasNext&&position==getCount()-1){
return TYPE_PAGER;
}else return TYPE_SCORE;
}
@Override
public int getViewTypeCount (){
return 1+((mHasBefore==true||mHasNext==true)?1:0);
}@Override
public View getView(int position, View convertView, ViewGroup parent) {
Log.d("outa","View: pos: "+position+ " . "+getItemViewType(position)+" - "+getViewTypeCount());
if(getItemViewType(position)==TYPE_SCORE)return getScoreView(position,convertView,parent);
else return getPagerView(position,convertView,parent);
}
protected View getPagerView(int position,View convertView,ViewGroup parent){
if (convertView == null){
convertView = LayoutInflater.from(parent.getContext()).inflate(
R.layout.listitem_highscore_pager, null);}}
protected View getScoreView(int position,View convertView,ViewGroup parent){
if (convertView == null){
convertView = LayoutInflater.from(parent.getContext()).inflate(
R.layout.listitem_highscore, null);}}
基本上,它应该在最后一个项目上显示不同的视图,但是即使LogCat指出它在getView()中不是TYPE_SCORE,它也仍然显示默认项目.因此,convertView确实提供了回收的视图.我做错了还是正常的行为?
Basicly it should show a different view on the last item but it still shows the default item even if the LogCat states it is not TYPE_SCORE in getView(). Hence convertView does provide a recycled view. Do I do something wrong or is this a normal behaviour?
推荐答案
在这里:
private static final int TYPE_PAGER = 0;
private static final int TYPE_PAGER = 1;
private static final int VIEW_COUNT = 2;
private LayoutInflater mInflater = LayoutInflater.from(context);
@Override
public int getViewTypeCount (){
return VIEW_COUNT;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder;
ViewHolder2 holder2;
int type = getItemViewType(position);
if (convertView == null) {
holder = new ViewHolder();
holder2 = new ViewHolder2();
switch(type){
case TYPE_SCORE:
Log.i(TAG, "ConvertView type1");
convertView = mInflater.inflate(R.layout.listitem_highscore, null);
convertView.setTag(R.layout.listitem_highscore, holder);
break;
case TYPE_PAGER:
Log.i(TAG, "ConvertView type0");
convertView = mInflater.inflate(R.layout.listitem_highscore_pager, null);
convertView.setTag(R.layout.listitem_highscore_pager, holder2);
break;
}
}
} else{
// Get the ViewHolder back to get fast access to the TextViews
holder = (ViewHolder) convertView.getTag(R.layout.baseadapter);
holder2 = (ViewHolder2)convertView.getTag(R.layout.baseadapter1);
}
switch(type){
case TYPE_SCORE:
holder.holderText.setText("type1");
break;
case TYPE_PAGER:
holder2.holder2Text.setText("type2");
break;
}
}
查看持有人:
static class ViewHolder {
//Place your views here for example:
TextView holderText;
}
static class ViewHolder2{
TextView holder2Text;
}
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