我查看了其他问题,但没有找到能解决我的具体问题的问题。如果我错过了,我深表歉意。
我有一个来自远程数据库的 ListView 。如果用户单击某个项目,我希望将项目信息传递到加载更多信息的详细 Activity 。当我运行应用程序并单击一个项目时,logcat 显示“整数无法转换为 RowData”。根据我在网上研究的内容以及我习惯在 Eclipse 中使用的内容,我认为获取该项目的位置是可行的。我正在使用 Android Studio 和 Volley。这是我的 onItemClickListener 和 RowData 类:
list.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
//Get item at position
RowData item = (RowData) parent.getItemAtPosition(position);
//Pass the image title and url to DetailsActivity
Intent intent = new Intent(MainActivity.this, DetailActivity.class);
intent.putExtra("title", item.getTitle());
intent.putExtra("image", item.getImageURL());
//Start details activity
startActivity(intent);
}
});
行数据:
public class RowData {
private String demo_name;
private String demo_size;
private String demo_image;
private String demo_detail;
private String demo_region;
public RowData(String demo_name,String demo_size,String demo_image,String demo_detail,String demo_region){
this.demo_name=demo_name;
this.demo_size=demo_size;
this.demo_image=demo_image;
this.demo_detail=demo_detail;
this.demo_region=demo_region;
}
public String getTitle(){
return demo_name;
}
public String getDescription(){
return demo_size;
}
public String getImageURL(){
return demo_image;
}
public String getDetailURL(){
return demo_detail;
}
public String getRegionURL(){
return demo_region;
}
}
自定义适配器:
public class CustomAdapter extends BaseAdapter implements Filterable{
private ArrayList<RowData> result;
private ArrayList<RowData> orig;
private Context context;
private static LayoutInflater inflater=null;
public CustomAdapter(MainActivity mainActivity, ArrayList<RowData> data) {
// TODO Auto-generated constructor stub
result=data;
context=mainActivity;
inflater = ( LayoutInflater )context.
getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
@Override
public int getCount() {
// TODO Auto-generated method stub
return result.size();
}
@Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return position;
}
@Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return position;
}
public Filter getFilter() {
return new Filter() {
@Override
protected FilterResults performFiltering(CharSequence constraint) {
final FilterResults oReturn = new FilterResults();
final ArrayList<RowData> results = new ArrayList<RowData>();
if (orig == null)
orig = result;
if (constraint != null) {
if (orig != null && orig.size() > 0) {
for (final RowData g : orig) {
if (g.getTitle().toLowerCase()
.contains(constraint.toString()))
results.add(g);
}
}
oReturn.values = results;
}
return oReturn;
}
@SuppressWarnings("unchecked")
@Override
protected void publishResults(CharSequence constraint,
FilterResults results) {
result = (ArrayList<RowData>) results.values;
notifyDataSetChanged();
}
};
}
public class Holder
{
TextView title;
TextView description;
NetworkImageView img;
}
@Override
public View getView(final int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
Holder holder=new Holder();
View rowView;
rowView = inflater.inflate(R.layout.list_item, null);
holder.title=(TextView) rowView.findViewById(R.id.textView1);
holder.description=(TextView) rowView.findViewById(R.id.textView2);
holder.img=(NetworkImageView) rowView.findViewById(R.id.networkImageView);
holder.title.setText(result.get(position).getTitle());
holder.description.setText(result.get(position).getDescription());
// If you are using NetworkImageView
holder.img.setImageUrl(result.get(position).getImageURL(), VolleyController.getInstance().getImageLoader());
return rowView;
}
}
最佳答案
问题出在这里:
@Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return position;
}
您应该重写此方法,以便它返回指定位置的 RowData
对象。像这样的东西:
@Override
public Object getItem(int position) {
if (result == null) {
return null;
}
return result.get(position);
}
您的原始表示形式正在返回 int
,您尝试将其转换为 RowData
,这导致了崩溃。
关于java - 来自远程数据库的 ListView onItemClickListener 未传递位置整数,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/35290565/