Filtering ListView using Filterable interface

#android_filterable_example.md

Android Filterable Example:

This is an example of using Filterable with a SearchView to filter the data of a ListView adapter.

activity_main.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity">

    <SearchView
        android:id="@+id/search_view"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:iconifiedByDefault="false"
        android:padding="2dp"
        android:queryHint="Search...." />

    <ListView
        android:id="@+id/lv"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_below="@+id/search_view"></ListView>

</RelativeLayout>

Bean.java

package com.almabay.filterlistdemo;

/**
 * Created by deepakr on 3/29/2016.
 */
public class Bean {
    String name, age;

    public Bean(String name, String age) {
        this.name = name;
        this.age = age;
    }


    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getAge() {
        return age;
    }

    public void setAge(String age) {
        this.age = age;
    }
}

MainActivity.java

package com.almabay.filterlistdemo;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.ListView;
import android.widget.SearchView;

import java.util.ArrayList;
import java.util.List;

public class MainActivity extends AppCompatActivity implements SearchView.OnQueryTextListener {
    private ListView lv;
    private SearchView sv;
    private List<Bean> beanList;
    MyAdapter adapter;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        sv = (SearchView) findViewById(R.id.search_view);
        lv = (ListView) findViewById(R.id.lv);

        String[] name = {"Deepak", "Ravi", "Raj", "Rakesh", "Mandeep", "Sishu"};
        String[] age = {"20", "30", "25", "45", "50", "35"};

        beanList = new ArrayList<Bean>();

        for (int i = 0; i < name.length; i++) {
            Bean bean = new Bean(name[i], age[i]);
            beanList.add(bean);
        }

        for (int i = 0; i < beanList.size(); i++) {
            Bean bean = beanList.get(i);
            String n = bean.getName();
            Log.e("Name", n);
        }


        adapter = new MyAdapter(getApplicationContext(), beanList);
        lv.setAdapter(adapter);
        sv.setOnQueryTextListener(this);
    }

    @Override
    public boolean onQueryTextSubmit(String s) {
        adapter.getFilter().filter(s);
        return false;
    }

    @Override
    public boolean onQueryTextChange(String s) {
        return false;
    }
}

MyAdapter.java

package com.almabay.filterlistdemo;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Adapter;
import android.widget.BaseAdapter;
import android.widget.Filter;
import android.widget.Filterable;
import android.widget.TextView;

import java.util.ArrayList;
import java.util.List;

/**
 * Created by deepakr on 3/29/2016.
 */
public class MyAdapter extends BaseAdapter implements Filterable {
    private Context context;
    private List<Bean> beanList;
    private LayoutInflater inflater;
    List<Bean> mStringFilterList;
    ValueFilter valueFilter;


    public MyAdapter(Context context, List<Bean> beanList) {
        this.context = context;
        this.beanList = beanList;
        mStringFilterList = beanList;
    }


    @Override
    public int getCount() {
        return beanList.size();
    }

    @Override
    public Object getItem(int i) {
        return beanList.get(i);
    }

    @Override
    public long getItemId(int i) {
        return i;
    }

    @Override
    public View getView(int i, View view, ViewGroup viewGroup) {
        if (inflater == null) {
            inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        }
        if (view == null) {
            view = inflater.inflate(R.layout.single_row, null);
        }

        TextView txtName = (TextView) view.findViewById(R.id.name);
        TextView txtAge = (TextView) view.findViewById(R.id.age);

        Bean bean = beanList.get(i);
        String name = bean.getName();
        String age = bean.getAge();

        txtName.setText(name);
        txtAge.setText(age);
        return view;
    }

    @Override
    public Filter getFilter() {
        if (valueFilter == null) {
            valueFilter = new ValueFilter();
        }
        return valueFilter;
    }

    private class ValueFilter extends Filter {
        @Override
        protected FilterResults performFiltering(CharSequence constraint) {
            FilterResults results = new FilterResults();

            if (constraint != null && constraint.length() > 0) {
                ArrayList<Bean> filterList = new ArrayList<Bean>();
                for (int i = 0; i < mStringFilterList.size(); i++) {
                    if ((mStringFilterList.get(i).getName().toUpperCase())
                            .contains(constraint.toString().toUpperCase())) {

                        Bean bean = new Bean(mStringFilterList.get(i)
                                .getName(), mStringFilterList.get(i)
                                .getAge());
                        filterList.add(bean);
                    }
                }
                results.count = filterList.size();
                results.values = filterList;
            } else {
                results.count = mStringFilterList.size();
                results.values = mStringFilterList;
            }
            return results;

        }

        @Override
        protected void publishResults(CharSequence constraint,
                                      FilterResults results) {
            beanList = (ArrayList<Bean>) results.values;
            notifyDataSetChanged();
        }

    }
}

single_row.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="horizontal">

    <TextView
        android:id="@+id/name"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

    <TextView
        android:id="@+id/age"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginLeft="20dp" />
</LinearLayout>