I need to override a getFilter()
method from the class ArrayAdapter
and i found the source code from here in the github
//package name
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import android.content.Context;
import android.util.Log;
import android.widget.ArrayAdapter;
import android.widget.Filter;
import android.widget.Filterable;
public class CustomAdapter<T> extends ArrayAdapter<T> implements Filterable{
private ArrayList<T> mOriginalValues;
private List<T> mObjects;
private CustomFilter mFilter;
private final Object mLock = new Object();
public CustomAdapter(Context context, int textViewResourceId, T[] objects) {
super(context, textViewResourceId, objects);
mObjects = Arrays.asList(objects);
// TODO Auto-generated constructor stub
}
@Override
public Filter getFilter() {
// TODO Auto-generated method stub
if (mFilter == null) {
mFilter = new CustomFilter();
}
return mFilter;
}
private class CustomFilter extends Filter {
@Override
protected FilterResults performFiltering(CharSequence prefix) {
FilterResults results = new FilterResults();
Log.d("bajji", "its ---> " + prefix);
if (mOriginalValues == null) {
synchronized (mLock) {
mOriginalValues = new ArrayList<T>(mObjects);
}
}
if (prefix == null || prefix.length() == 0) {
ArrayList<T> list;
synchronized (mLock) {
list = new ArrayList<T>(mOriginalValues);
}
results.values = list;
results.count = list.size();
} else {
String prefixString = prefix.toString().toLowerCase();
ArrayList<T> values;
synchronized (mLock) {
values = new ArrayList<T>(mOriginalValues);
}
final int count = values.size();
final ArrayList<T> newValues = new ArrayList<T>();
final ArrayList<T> approxValues = new ArrayList<T>();
final ArrayList<T> secondApproxValues = new ArrayList<T>();
for (int i = 0; i < count; i++) {
final T value = values.get(i);
final String valueText = value.toString().toLowerCase();
boolean flag = true;
// First match against the whole, non-splitted value
if (valueText.startsWith(prefixString)) {
newValues.add(value);
flag = false;
} else {
final String[] words = valueText.split(" ");
final int wordCount = words.length;
// Start at index 0, in case valueText starts with space(s)
for (int k = 0; k < wordCount; k++) {
if (words[k].startsWith(prefixString)) {
newValues.add(value);
flag = false;
break;
}
}
}
if(flag) {
if(approxMatch(valueText, prefixString) <= 3) { //change the stuff and do a levi work
approxValues.add(value);
}
else {
final String[] words = valueText.split(" ");
final int wordCount = words.length;
// Start at index 0, in case valueText starts with space(s)
for (int k = 0; k < wordCount; k++) {
if(approxMatch(words[k], prefixString) <= 3) {
//leve work
secondApproxValues.add(value);
break;
}
}
}
}
}
newValues.addAll(approxValues);
newValues.addAll(secondApproxValues);
results.values = newValues;
results.count = newValues.size();
}
return results;
}
@Override
protected void publishResults(CharSequence constraint, FilterResults results) {
//noinspection unchecked
mObjects = (List<T>) results.values;
if (results.count > 0) {
notifyDataSetChanged();
} else {
notifyDataSetInvalidated();
}
}
}
private int approxMatch (String s, String t) {
// an approxmimate string matching algo
return p;
}
}
The problem is the getFilter method has a object of a private inner class ArrayFilter
which has a method peformFiltering
and i need to put a different code there so i have to overide the class. And i get an exception in the method.
In the derived class which extends ArrayAdapter i created a private inner class which is similar to ArrayFilter
and called it MyFilter
and i get the same exception again in the method performFiltering
.
I found a solution to solve my problem. I copied all the code in ArrayAdapter
class and created a new class called MyAdapter
and i altered some code inside the inner class ArrayFilter
and the app works the way i wanted it to. But i feel its not the best solution.
Android has various api levels so if the array adapter is changed in different api level then i have to add those changes in my codes to. So i feel the best way is to extend the class ArrayAdapter
to create MyAdapter
rather than just copying and pasting the code from the ArrayAdapter
How can i override the inner private class of a parent class..?
Edit: The exception i get..
Edit2: Now i added the full code in the question. and it works perfectly if i copy and edit the array adapter.. the problem is only when i extend..!! now the code and search is working perfectly. I checked it with Log.i
.. but the drop down list for auto complete suggestion in UI is not working.. i only get for the first character i type the next character filtering takes place but UI update is not taking place.
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