Skip to content

Instantly share code, notes, and snippets.

@fjfish
Created June 30, 2012 15:48
Show Gist options
  • Save fjfish/3024308 to your computer and use it in GitHub Desktop.
Save fjfish/3024308 to your computer and use it in GitHub Desktop.
Simple String Adapter for Android ListView that has a filter that gives whatever it finds and ignores word boundaries
<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/list_view"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:padding="10dp"
android:textSize="16sp" >
</TextView>
package com.yourco.yourapp;
import java.util.ArrayList;
import java.util.List;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.Filter;
import android.widget.Filterable;
import android.widget.TextView;
// The standard text view adapter only seems to search from the beginning of whole words
// so we've had to write this whole class to make it possible to search
// for parts of the arbitrary string we want
public class SearchableAdapter extends BaseAdapter implements Filterable {
private List<String>originalData = null;
private List<String>filteredData = null;
private LayoutInflater mInflater;
private ItemFilter mFilter = new ItemFilter();
public SearchableAdapter(Context context, List<String> data) {
this.filteredData = data ;
this.originalData = data ;
mInflater = LayoutInflater.from(context);
}
public int getCount() {
return filteredData.size();
}
public Object getItem(int position) {
return filteredData.get(position);
}
public long getItemId(int position) {
return position;
}
public View getView(int position, View convertView, ViewGroup parent) {
// A ViewHolder keeps references to children views to avoid unnecessary calls
// to findViewById() on each row.
ViewHolder holder;
// When convertView is not null, we can reuse it directly, there is no need
// to reinflate it. We only inflate a new View when the convertView supplied
// by ListView is null.
if (convertView == null) {
convertView = mInflater.inflate(R.layout.list_item, null);
// Creates a ViewHolder and store references to the two children views
// we want to bind data to.
holder = new ViewHolder();
holder.text = (TextView) convertView.findViewById(R.id.list_view);
// Bind the data efficiently with the holder.
convertView.setTag(holder);
} else {
// Get the ViewHolder back to get fast access to the TextView
// and the ImageView.
holder = (ViewHolder) convertView.getTag();
}
// If weren't re-ordering this you could rely on what you set last time
holder.text.setText(filteredData.get(position));
return convertView;
}
static class ViewHolder {
TextView text;
}
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();
final List<String> list = originalData;
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) {
filteredData = (ArrayList<String>) results.values;
notifyDataSetChanged();
}
}
}
@prathibhaprabs
Copy link

prathibhaprabs commented Apr 25, 2017

Amazing!!! A small edit,
public int getCount() {
return filteredData == null ? 0 : filteredData.size();
}

Perfect now :)
But when I do BackSpace, it is sorting until it has at least one character. On deleting the entire data, drop down is not shown. and when I click it again drop down is not coming.

WHYYYYYYYYYYY???????

@prathibhaprabs
Copy link

@ganesh76 How do we show the default list when text is removed. Do you have any solution for this?

@maxmiliano
Copy link

@prathibhaprabs You must update the results.values with the reference to the original data.
I've done this with the code below, before the for:

        if (filterString.isEmpty()) {
            results.values = list;
            results.count = list.size();
            return results;
        }

@trifagabriel
Copy link

Thank you!!

@brunoperezm
Copy link

Thanks a lot!! This helped me so much!

@nithinkolekar
Copy link

Thanks
[simple star or follow button could have omitted this unwanted comment]

Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment