我正在android中创建一个论坛样式活动，其中论坛问题及其详细信息从firebase数据库收集，然后显示在自定义多行列表视图中。现在我想使用适配器过滤器实现搜索选项。我已经从web和stackoverflow中学到了很多教程，但这些都没有实际工作。这是我在stackoverflow中关注的link之一。问题是在搜索之后，过滤器总是显示第一个listview项而不进行过滤。
这是我的活动，我使用String数组填充Listview：
final String key[] = new String[keysList.size()];
keysList.toArray(key);
final String category[] = new String[categoryList.size()];
categoryList.toArray(category);
final String name[] = new String[namesList.size()];
namesList.toArray(name);
final String location[] = new String[locationList.size()];
locationList.toArray(location);
final String description[] = new String[questionsList.size()];
questionsList.toArray(description);
final String title[] = new String[titlesList.size()];
titlesList.toArray(title);
final String date[] = new String[dateList.size()];
dateList.toArray(date);
final int randomclrs[] = new int[dateList.size()]; // random clr string array with the same size as data
for (int i =0; i< randomclrs.length;i++){
Random random = new Random();
randomclrs[i] = Color.rgb(random.nextInt(255), random.nextInt(255), random.nextInt(255));
}
adapter = new custom_forum_list_adapter(forum.this,name,category,date,location,key,title,description,randomclrs);
list.setAdapter(adapter);
custom_forum_list_adapter：
注意：我正在过滤类别字符串数组。
public class custom_forum_list_adapter extends ArrayAdapter<String> implements Filterable {
private final Activity context;
private final String[] name;
private final String[] category;
private final String[] date;
private final String[] location;
private final String[] key;
private final String[] title;
private final String[] question;
private final int[] color;
List<String> arrayListtofilter;
List<String> mOriginalValues;
public custom_forum_list_adapter(Activity context,
String[] name, String[] category, String[] date, String[] location, String[] key, String[] title,
String[] question, int[] color) {
super(context, R.layout.activity_fixers_in_list, name);
this.context = context;
this.name = name;
this.category = category;
this.date = date;
this.location = location;
this.key = key;
this.title = title;
this.question = question;
this.color = color;
this.arrayListtofilter = new ArrayList<String>(Arrays.asList(category));
}
@Override
public int getCount() {
return arrayListtofilter.size();
}
@Override
public View getView(int position, View view, ViewGroup parent) {
LayoutInflater inflater = context.getLayoutInflater();
View rowView= inflater.inflate(R.layout.forum_listview, parent, false);
TextView txtname = (TextView) rowView.findViewById(R.id.forum_name);
txtname.setText(name[position]);
TextView txtcategory = (TextView) rowView.findViewById(R.id.forum_category);
txtcategory.setText(category[position]);
TextView txtdate = (TextView) rowView.findViewById(R.id.forumdate);
txtdate.setText(date[position]);
TextView txtlocation = (TextView) rowView.findViewById(R.id.forumlocation);
txtlocation.setText(location[position]);
TextView txttitle = (TextView) rowView.findViewById(R.id.forum_title);
txttitle.setText(title[position]);
TextView txtdescription = (TextView) rowView.findViewById(R.id.forumdescription);
txtdescription.setText(question[position]);
TextView firstletter = (TextView) rowView.findViewById(R.id.forum_firstletter);
firstletter.setText(name[position].substring(0,1));
ImageView img = (ImageView) rowView.findViewById(R.id.randomcolor);
img.setColorFilter(color[position]);
return rowView;
}
@Override
public Filter getFilter() {
Filter filter = new Filter() {
@SuppressWarnings("unchecked")
@Override
protected void publishResults(CharSequence constraint,FilterResults results) {
arrayListtofilter = (List<String>) results.values; // has the filtered values
notifyDataSetChanged(); // notifies the data with new filtered values
}
@Override
protected FilterResults performFiltering(CharSequence constraint) {
FilterResults results = new FilterResults(); // Holds the results of a filtering operation in values
List<String> FilteredArrList = new ArrayList<String>();
if (mOriginalValues == null) {
mOriginalValues = new ArrayList<String>(arrayListtofilter);
}
if (constraint == null || constraint.length() == 0) {
// set the Original result to return
results.count = mOriginalValues.size();
results.values = mOriginalValues;
} else {
constraint = constraint.toString().toLowerCase();
for (int i = 0; i < mOriginalValues.size(); i++) {
String data = mOriginalValues.get(i);
if (data.toLowerCase().startsWith(constraint.toString())) {
FilteredArrList.add(data);
}
}
// set the Filtered result to return
results.count = FilteredArrList.size();
results.values = FilteredArrList;
}
return results;
}
};
return filter;
}