我有一个自定义的 Adapter
,用于在 ListView
中显示自定义对象。此外,我使用了一个 SearchView
,它允许我在 ListView
中搜索并过滤出结果。但是,当我尝试输入搜索时,我注意到一些奇怪的行为。只要我搜索列表中的项目,筛选器中就会显示一个项目 - 但是,项目始终显示在列表顶部。如果列表中有 10 个项目并且搜索产生 5 个匹配项,则结果将显示列表中的前 5 个项目而不是 5 个实际匹配项。例如,考虑这个包含 6 个摩托车 Helm 的列表:
- 贝尔
- 图标
- 哈雷戴维森
- 乔火箭
- 翔荣
- 雷神
如果我搜索“ho”,结果列表应该如下:
- Shoei
- Thor
但是,我得到的列表是前两项:
- 贝尔
- 图标
我不明白为什么搜索不能正常工作。任何帮助,将不胜感激。我的代码如下所示...
Helm Activity .java
public class HelmetActivity extends ActionBarActivity implements
SearchView.OnQueryTextListener{
private Menu menu;
private ListView listView;
private HelmetAdapter helmetAdapter;
private List<Helmet> arrayList;
private SearchManager searchManager;
private SearchView searchView;
private MenuItem searchMenuItem;
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.helmet_activity);
ActionBar actionBar = getSupportActionBar();
actionBar.setElevation(0);
listView = (ListView) findViewById(R.id.helmet_listview);
listView.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);
arrayList = new ArrayList<Helmet>();
listView.setLongClickable(true);
helmetAdapter = new HelmetAdapter(this, R.layout.helmet, arrayList);
listView.setAdapter(helmetAdapter);
arrayList.add(new Helmet("Bell"));
arrayList.add(new Helmet("Icon"));
arrayList.add(new Helmet("Harley Davidson"));
arrayList.add(new Helmet("Joe Rocket"));
arrayList.add(new Helmet("Shoei"));
arrayList.add(new Helmet("Thor"));
}
@Override
public boolean onCreateOptionsMenu(Menu menu)
{
this.menu = menu;
MenuInflater menuInflater = getMenuInflater();
menuInflater.inflate(R.menu.helmet_activity_menu, menu);
SearchManager searchManager = (SearchManager) getSystemService(
Context.SEARCH_SERVICE);
searchMenuItem = menu.findItem(R.id.action_search);
searchView = (SearchView) searchMenuItem.getActionView();
searchView.setSearchableInfo(searchManager.getSearchableInfo(
getComponentName()));
searchView.setSubmitButtonEnabled(true);
searchView.setOnQueryTextListener(HelmetActivity.this);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item)
{
return super.onOptionsItemSelected(item);
}
@Override
public boolean onQueryTextSubmit(String query) {
return false;
}
@Override
public boolean onQueryTextChange(String newText)
{
helmetAdapter.getFilter().filter(newText);
return true;
}
}
Helm 适配器.java
public class HelmetAdapter extends ArrayAdapter<Helmet> implements Filterable
{
private int resource;
private LayoutInflater inflater;
private Context context;
private List<Helmet> helmetList;
private List<Helmet> filteredHelmetList;
private HelmetFilter helmetFilter;
public HelmetAdapter (Context pContext, int pResource, List<Helmet> helmetList)
{
super (pContext, pResource, helmetList);
resource = pResource;
inflater = LayoutInflater.from (pContext);
context = pContext;
this.helmetList = helmetList;
this.filteredHelmetList = helmetList;
getFilter();
}
@Override
public View getView (final int position, View convertView, ViewGroup parent)
{
if (convertView == null)
{ convertView = inflater.inflate(resource, parent, false); }
String uri;
int imageResource;
Drawable image;
Helmet helmet = getItem (position);
TextView hName = (TextView) convertView.findViewById(R.id.h_name);
hName.setText(helmet.getName());
return convertView;
}
@Override
public int getCount()
{ return filteredHelmetList.size(); }
@Override
public Filter getFilter()
{
if (helmetFilter == null)
{
helmetFilter = new HelmetFilter();
}
return helmetFilter;
}
private class HelmetFilter extends Filter
{
@Override
protected FilterResults performFiltering (CharSequence constraint)
{
FilterResults filterResults = new FilterResults();
if (constraint != null && constraint.length() > 0)
{
ArrayList<Helmet> temporaryHelmetList = new ArrayList<Helmet>();
for (Helmet helmet : helmetList)
{
if (helmet.getName().toLowerCase().contains(constraint.toString()
.toLowerCase()))
{
temporaryHelmetList.add(helmet);
}
}
filterResults.count = temporaryHelmetList.size();
filterResults.values = temporaryHelmetList;
}
else
{
filterResults.count = helmetList.size();
filterResults.values = helmetList;
}
return filterResults;
}
@SuppressWarnings("unchecked")
@Override
protected void publishResults(CharSequence constraint, FilterResults results)
{
filteredHelmetList = (ArrayList<Helmet>) results.values;
notifyDataSetChanged();
}
}
}
Helm .java
public class Helmet
{
public Helmet (String name)
{
super();
this.name = name;
}
private String name;
public String getName ()
{
return name;
}
public void setName (String pName)
{
this.name = pName;
}
}
最佳答案
在我看来,您的问题很可能出在适配器的 getView(..)
方法上。
特别是这一行-
Helmet helmet = getItem (position);
如果您要退回原始 Helm 阵列中的元素,那么这就可以解释为什么您会得到这样的结果。但是,我不能确定,因为我没有在您的代码中看到您的 getItem(..)
方法。如果情况确实如此,那么您当然希望在此处返回过滤后的结果(如果有的话),而不是未过滤列表中的结果。
关于java - ListView Filter 过滤正确但显示错误结果,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/28259304/