问题
I have implement search for my application. For that I have used an adapter as well. I have loaded 30 items to the search screen. When I pressed letter z to search, then letter z belongs to 4 items out of 30 items in the list.
According to the below shown code it identifies the number 4 and shows the first 4 items out of the 30 items. When I debug inside getFilter(), it shows the filtered items correctly(I have provided a screen shot).
My problem is how can I load the filtered items. Bit confused here.
search.java
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.search_results_activity);
new SearchMenuAsyncTask(getApplicationContext(), this).execute();
listtv = (LinearLayout) findViewById(R.id.product_lv);
lv = (ListView) findViewById(R.id.list_view);
inputSearch = (EditText) findViewById(R.id.inputSearch);
lv.setTextFilterEnabled(true);
inputSearch.addTextChangedListener(new TextWatcher() {
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
System.out.println("Text ["+s+"]");
adapter.getFilter().filter(s.toString());
TextView headerTV = (TextView) findViewById(R.id.search_header);
headerTV.setText("SEARCH RESULTS");
}
@Override
public void beforeTextChanged(CharSequence s, int start, int count,
int after) {
}
@Override
public void afterTextChanged(Editable s) {
}
});
}
@Override
public void onTaskCompleted(JSONArray responseJson) {
try {
final List<String> menudescriptions = new ArrayList<String>();
for (int i = 0; i < responseJson.length(); ++i) {
final JSONObject object = responseJson.getJSONObject(i);
if ((object.getString("MainCategoryID")).equals("1")
&& (object.getString("SubCategoryID")).equals("1")
&& (object.getString("Visible")).equals("true")) {
Log.i("descriptionsTop ", object.getString("Description"));
descriptions.add(object.getString("Description"));
Log.i("MenuDescription ",
object.getString("MenuDescription"));
menudescriptions
.add(object.getString("MenuDescription"));
}
adapter = new CustomListSearch(
getApplicationContext(), descriptions,
menudescriptions);
lv.setAdapter(adapter);
}
} catch (JSONException e) {
e.printStackTrace();
}
}
CustomListSearch.java
public class CustomListSearch extends BaseAdapter implements Filterable {
private Context context;
List<String> descriptions;
private List<String>filteredDescriptions;
private final List<String> menudescriptions;
private ItemFilter mFilter = new ItemFilter();
private LayoutInflater mInflater;
ArrayAdapter<String> adapter;
public CustomListSearch(Context c, List<String> data,
List<String> menudescriptions) {
this.context = c;
this.filteredDescriptions = data ;
this.descriptions = data;
this.menudescriptions = menudescriptions;
mInflater = LayoutInflater.from(context);
}
@Override
public int getCount() {
return filteredDescriptions.size();
}
@Override
public Object getItem(int position) {
return filteredDescriptions.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
private class ViewHolder {
private TextView tvMenudescriptions;
private TextView tvDescriptions;
}
@Override
public View getView(final int position, View convertView, ViewGroup parent) {
ViewHolder holder;
if (convertView == null) {
holder = new ViewHolder();
convertView = LayoutInflater.from(context).inflate(
R.layout.search_list_item, parent, false);
holder.tvDescriptions = (TextView) convertView
.findViewById(R.id.product_name);
holder.tvMenudescriptions = (TextView) convertView
.findViewById(R.id.product_description);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
holder.tvDescriptions.setText(descriptions.get(position));
holder.tvMenudescriptions.setText(menudescriptions.get(position));
LinearLayout itemlist = (LinearLayout) convertView
.findViewById(R.id.product_lv);
itemlist.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Toast.makeText(context, "Still under constructions...",
Toast.LENGTH_LONG).show();
}
});
return convertView;
}
@Override
public Filter getFilter() {
// TODO Auto-generated method stub
return mFilter;
}
private class ItemFilter extends Filter {
@Override
protected FilterResults performFiltering(CharSequence constraint) {
String filterString = constraint.toString().toLowerCase();
FilterResults results = new FilterResults();
final List<String> list = descriptions;
int count = list.size();
final ArrayList<String> nlist = new ArrayList<String>(count);
String filterableString ;
for (int i = 0; i < count; i++) {
filterableString = list.get(i);
if (filterableString.toLowerCase().contains(filterString)) {
nlist.add(filterableString);
}
}
results.values = nlist;
results.count = nlist.size();
return results;
}
@SuppressWarnings("unchecked")
@Override
protected void publishResults(CharSequence constraint, FilterResults results) {
filteredDescriptions = (ArrayList<String>) results.values;
notifyDataSetChanged();
}
}
}
Screen shot
回答1:
To filter adapter that contains list of custom object
Create a Object:
public class TvObject {
String name;
String description;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getDescription() {
return description;
}
public void setDescription(String description) {
this.description = description;
}
}
After:
public class CustomListSearch extends BaseAdapter implements Filterable {
private Context context;
private ItemFilter mFilter = new ItemFilter();
private LayoutInflater mInflater;
private List<TvObject> mListTvObject = new ArrayList<>();
private List<TvObject> mListTvObjectFiltered = new ArrayList<>();
public CustomListSearch(Context c, List<TvObject> mListTvObject) {
this.context = c;
mInflater = LayoutInflater.from(context);
this.mListTvObject = mListTvObject;
this.mListTvObjectFiltered = mListTvObject;
}
@Override
public int getCount() {
return mListTvObjectFiltered.size();
}
@Override
public Object getItem(int position) {
return mListTvObjectFiltered.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
private class ViewHolder {
private TextView tvMenudescriptions;
private TextView tvDescriptions;
}
@Override
public View getView(final int position, View convertView, ViewGroup parent) {
ViewHolder holder;
if (convertView == null) {
holder = new ViewHolder();
convertView = mInflater.inflate(R.layout.search_list_item, parent, false);
holder.tvDescriptions = (TextView) convertView.findViewById(R.id.product_name);
holder.tvMenudescriptions = (TextView) convertView.findViewById(R.id.product_description);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
holder.tvDescriptions.setText(mListTvObjectFiltered.get(position).getName());
holder.tvMenudescriptions.setText(mListTvObjectFiltered.get(position).getDescription());
LinearLayout itemlist = (LinearLayout) convertView.findViewById(R.id.product_lv);
itemlist.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Toast.makeText(context, "Still under constructions...",Toast.LENGTH_LONG).show();
}
});
return convertView;
}
@Override
public Filter getFilter() {
return mFilter;
}
private class ItemFilter extends Filter {
@Override
protected FilterResults performFiltering(CharSequence constraint) {
String filterString = constraint.toString().toLowerCase();
FilterResults results = new FilterResults();
int count = mListTvObject.size();
final ArrayList<TvObject> mListResult = new ArrayList<>();
String name;
for (int i = 0; i < count; i++) {
TvObject mTvObject = mListTvObject.get(i);
name = mTvObject.getName();
if (name.toLowerCase().contains(filterString)) {
mListResult.add(mTvObject);
}
}
results.values = mListResult;
results.count = mListResult.size();
return results;
}
@SuppressWarnings("unchecked")
@Override
protected void publishResults(CharSequence constraint, Filter.FilterResults results) {
mListTvObjectFiltered = (ArrayList<TvObject>) results.values;
notifyDataSetChanged();
}
}
}
Edited:
In your Activity do something like this!
try {
final List<TvObject > mListObjects = new ArrayList<>();
for (int i = 0; i < responseJson.length(); ++i) {
final JSONObject object = responseJson.getJSONObject(i);
if ((object.getString("MainCategoryID")).equals("1")
&& (object.getString("SubCategoryID")).equals("1")
&& (object.getString("Visible")).equals("true")) {
Log.i("descriptionsTop ", object.getString("Description"));
Log.i("MenuDescription ", object.getString("MenuDescription"));
TvObject mTvObject = new TvObject();
mTvObject.setName(object.getString("Description"));
mTvObject.setDescription(object.getString("MenuDescription"));
mListObjects.add(mTvObject);
}
adapter = new CustomListSearch( getApplicationContext(), mListObjects);
lv.setAdapter(adapter);
}
} catch (JSONException e) {
e.printStackTrace();
}
来源：https://stackoverflow.com/questions/29340403/loading-the-filtered-items-to-search-output