我面临一些从动态布局渲染ListView的问题。我不知道为什么getView仅在位置0被调用多次！
我搜索过互联网和stackoverflow但找不到合适的答案。
我实际上正在尝试对此进行演示：http://www.framentos.com/en/android-tutorial/2012/07/16/listview-in-android-using-custom-listadapter-and-viewcache/
值得注意的是，我的主要布局文件被滚动条包围。
主要活动布局文件：
<ListView
android:id="@+id/city_list"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_below="@+id/questionsList"
android:paddingTop="20sp" >
</ListView>
我的列表视图布局文件：
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="80dip" >
<ImageView
android:id="@+id/ImageCity"
android:layout_width="90sp"
android:layout_height="90sp" />
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_toRightOf="@id/ImageCity"
android:orientation="vertical"
android:paddingLeft="10sp">
<TextView
android:id="@+id/cityName"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:textSize="25sp" />
<TextView
android:id="@+id/cityLinkWiki"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:autoLink="web"
android:textSize="15sp" />
</LinearLayout>
</RelativeLayout>
适配器类：
import com.incidentreport.app.classes.objects.City;
public class CityListAdapter extends ArrayAdapter{
private int resource;
private LayoutInflater inflater;
private Context context;
public CityListAdapter ( Context ctx, int resourceId, List objects) {
super( ctx, resourceId, objects );
resource = resourceId;
inflater = LayoutInflater.from( ctx );
context=ctx;
}
@Override
public View getView ( int position, View convertView, ViewGroup parent ) {
Log.v("adapter", "pos: " + position + "#" + resource);
/* create a new view of my layout and inflate it in the row */
convertView = ( RelativeLayout ) inflater.inflate( resource, null );
/* Extract the city's object to show */
City city = (City)getItem( position );
/* Take the TextView from layout and set the city's name */
TextView txtName = (TextView) convertView.findViewById(R.id.cityName);
txtName.setText(city.getName());
/* Take the TextView from layout and set the city's wiki link */
TextView txtWiki = (TextView) convertView.findViewById(R.id.cityLinkWiki);
txtWiki.setText(city.getUrlWiki());
/* Take the ImageView from layout and set the city's image */
ImageView imageCity = (ImageView) convertView.findViewById(R.id.ImageCity);
return convertView;
}
}
主要活动代码snipps：
List listCity= new ArrayList();
listCity.add(new City("London","http://en.wikipedia.org/wiki/London","london"));
listCity.add(new City("Rome","http://en.wikipedia.org/wiki/Rome","rome"));
listCity.add(new City("Paris","http://en.wikipedia.org/wiki/Paris","paris"));
ListView listViewCity = ( ListView ) findViewById( R.id.city_list);
listViewCity.setAdapter( new CityListAdapter(this, R.layout.layout_city, listCity ) );
答案 0 :(得分：3)
好的，我通过尽可能扩展ListView来解决这个问题。这意味着，给出一个动态的全高度，以便所有项目都可见。
我按照以下解决方案：
Calculate the size of a list view or how to tell it to fully expand
答案 1 :(得分：2)
使用ViewHolder模式可获得更好的效果。
http://developer.android.com/training/improving-layouts/smooth-scrolling.html
static class ViewHolder
{
TextView txtName,txtWiki;
ImageView imageCity;
}
将getView更改为
@Override
public View getView ( int position, View convertView, ViewGroup parent ) {
ViewHolder holder;
if(convertView == null)
{
convertView = ( RelativeLayout ) inflater.inflate( resource, parent, false );
holder = new ViewHolder();
holder.txtName = (TextView) convertView.findViewById(R.id.cityName);
holder.txtWiki = (TextView) convertView.findViewById(R.id.cityLinkWiki);
holder.imageCity = (ImageView) convertView.findViewById(R.id.ImageCity);
convertView.setTag(holder);
}else{
holder = (ViewHolder) convertView.getTag();
}
City city = (City)getItem( position );
holder.txtName.setText(city.getName());
holder.txtWiki.setText(city.getUrlWiki());
return convertView;
}
ListView回收视图＆＃39>。您可能还想阅读
答案 2 :(得分：1)
请尝试这种方式，希望这有助于您解决问题。
public class CityListAdapter extends BaseAdapter{
private Context context;
private List objects;
public CityListAdapter ( Context context, int resourceId, List objects) {
this.context=context;
this.objects=objects;
}
@Override
public int getCount() {
return objects.size();
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public Object getItem(int position) {
return objects.get(position);
}
@Override
public View getView ( int position, View convertView, ViewGroup parent ) {
ViewHolder holder;
if(convertView==null){
holder = new ViewHolder();
convertView = LayoutInflater.from(context).inflate(R.layout.layout_city,null);
holder.txtName = (TextView) convertView.findViewById(R.id.cityName);
holder.txtWiki = (TextView) convertView.findViewById(R.id.cityLinkWiki);
holder.imageCity = (ImageView) convertView.findViewById(R.id.ImageCity);
convertView.setTag(holder);
}else{
holder = (ViewHolder) convertView.getTag();
}
holder.txtName.setText(((City)getItem(position)).getName());
holder.txtWiki.setText(((City)getItem(position)).getUrlWiki());
return convertView;
}
class ViewHolder{
TextView txtName;
TextView txtWiki;
ImageView imageCity;
}
}
答案 3 :(得分：1)
我遇到了同样的问题。我的列表视图主要是工作，但是有一系列的操作会使某些项目消失。之后单击它们会导致NullPointerException。
以下是重现错误的步骤：
调试后，我发现我的StableArrayAdapter.getView（）方法被调用了两次，仅用于列表顶部的空白项目。
要修复它，根据masum7的回答，我将DynamicListView的layout_height设置为“wrap_content”。
答案 4 :(得分：0)
尝试将布局inflater设为 LayoutInflater inflater =（LayoutInflater）context.getSystemService （Context.LAYOUT_INFLATER_SERVICE）; 这可能有用