[英]How do I get this ListActivity to update the info?
如何使用我创建的自定义ListAdapter刷新ListActivity的内容? 我在arrayadapter中有一个调用“ notifyDataSetChanged();”的方法。 那行不通。 该站点上都没有任何相关的解决方案。 到目前为止的代码如下:
private final Activity context;
private Message[] messages;
public RamRSSAdapter(Activity context, Message[] messages) {
super(context, R.layout.ram_rss_row);
this.context = context;
this.messages = messages;
}
// static to save the reference to the outer class and to avoid access to
// any members of the containing class
static class ViewHolder {
public ImageView imageView;
public TextView textView;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
// ViewHolder will buffer the assess to the individual fields of the row
// layout
ViewHolder holder;
// Recycle existing view if passed as parameter
// This will save memory and time on Android
// This only works if the base layout for all classes are the same
View rowView = convertView;
//string code goes here
if (rowView == null) {
LayoutInflater inflater = context.getLayoutInflater();
rowView = inflater.inflate(R.layout.ram_rss_row, null, true);
holder = new ViewHolder();
holder.textView = (TextView) rowView.findViewById(R.id.label);
holder.imageView = (ImageView) rowView.findViewById(R.id.icon);
rowView.setTag(holder);
} else {
holder = (ViewHolder) rowView.getTag();
}
holder.textView.setText(messages[position].getTitle());
//code for image here
holder.imageView.setImageResource(getImageResID(getType(messages[position].getTitle())));
return rowView;
}
private String getType(String title){
int i1 = title.indexOf("[");
int i2 = title.indexOf("]");
if((i1==-1)||(i2==-1)){
return "";
}else{
return title.substring(i1+1, i2);
}
}
public void changeData(Message[] newData){
messages = newData;
notifyDataSetChanged();
}
/*
private int getImageResID(String type){
}
}
我还没有看到notifyDataSetChanged()做任何事情的情况。 我刚刚根据最新信息获得了一个新的适配器,并更改了ListView上的滚动位置以使其看起来像是刚刚更新的。
您不应该直接覆盖数据数组-而是使用ArrayAdapter
提供的clear / insert / add / addAll / remove方法。
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