Filter list android

How to display a List by inflating a Custom Layout in a ListView and filter the results from an EditText

Well if you familiar with using the ListView to display a simple list from an Array and looking to enhance the display with a custom layout then here is an example which will covers most of your needs. In this example we cover the follwing topics

• Display data in a List using the ListView
• Define a custom Layout based on your display needs
• Ability to filter the results as you type in an EditText by extending the Filter class
• Attach an OnItemClickListener to check when the user taps on an Item

Source for Activity - AndroidListViewCustomLayoutActivity.java

package com.as400samplecode; import java.util.ArrayList; import android.app.Activity; import android.content.Context; import android.os.Bundle; import android.text.Editable; import android.text.TextWatcher; import android.util.Log; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.AdapterView; import android.widget.ArrayAdapter; import android.widget.EditText; import android.widget.Filter; import android.widget.ListView; import android.widget.TextView; import android.widget.Toast; import android.widget.AdapterView.OnItemClickListener; public class AndroidListViewCustomLayoutActivity extends Activity { MyCustomAdapter dataAdapter = null; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); //Generate list View from ArrayList displayListView(); } private void displayListView() { //Array list of countries ArrayList countryList = new ArrayList(); Country country = new Country("AFG","Afghanistan","Asia", "Southern and Central Asia"); countryList.add(country); country = new Country("ALB","Albania","Europe","Southern Europe"); countryList.add(country); country = new Country("DZA","Algeria","Africa","Northern Africa"); countryList.add(country); country = new Country("ASM","American Samoa","Oceania","Polynesia"); countryList.add(country); country = new Country("AND","Andorra","Europe","Southern Europe"); countryList.add(country); country = new Country("AGO","Angola","Africa","Central Africa"); countryList.add(country); country = new Country("AIA","Anguilla","North America","Caribbean"); countryList.add(country); //create an ArrayAdaptar from the String Array dataAdapter = new MyCustomAdapter(this, R.layout.country_info, countryList); ListView listView = (ListView) findViewById(R.id.listView1); // Assign adapter to ListView listView.setAdapter(dataAdapter); //enables filtering for the contents of the given ListView listView.setTextFilterEnabled(true); listView.setOnItemClickListener(new OnItemClickListener() { public void onItemClick(AdapterView parent, View view, int position, long id) { // When clicked, show a toast with the TextView text Country country = (Country) parent.getItemAtPosition(position); Toast.makeText(getApplicationContext(), country.getCode(), Toast.LENGTH_SHORT).show(); } }); EditText myFilter = (EditText) findViewById(R.id.myFilter); myFilter.addTextChangedListener(new TextWatcher() { public void afterTextChanged(Editable s) { } public void beforeTextChanged(CharSequence s, int start, int count, int after) { } public void onTextChanged(CharSequence s, int start, int before, int count) { dataAdapter.getFilter().filter(s.toString()); } }); } private class MyCustomAdapter extends ArrayAdapter { private ArrayList originalList; private ArrayList countryList; private CountryFilter filter; public MyCustomAdapter(Context context, int textViewResourceId, ArrayList countryList) { super(context, textViewResourceId, countryList); this.countryList = new ArrayList(); this.countryList.addAll(countryList); this.originalList = new ArrayList(); this.originalList.addAll(countryList); } @Override public Filter getFilter() { if (filter == null){ filter = new CountryFilter(); } return filter; } private class ViewHolder { TextView code; TextView name; TextView continent; TextView region; } @Override public View getView(int position, View convertView, ViewGroup parent) { ViewHolder holder = null; Log.v("ConvertView", String.valueOf(position)); if (convertView == null) { LayoutInflater vi = (LayoutInflater)getSystemService( Context.LAYOUT_INFLATER_SERVICE); convertView = vi.inflate(R.layout.country_info, null); holder = new ViewHolder(); holder.code = (TextView) convertView.findViewById(R.id.code); holder.name = (TextView) convertView.findViewById(R.id.name); holder.continent = (TextView) convertView.findViewById(R.id.continent); holder.region = (TextView) convertView.findViewById(R.id.region); convertView.setTag(holder); } else { holder = (ViewHolder) convertView.getTag(); } Country country = countryList.get(position); holder.code.setText(country.getCode()); holder.name.setText(country.getName()); holder.continent.setText(country.getContinent()); holder.region.setText(country.getRegion()); return convertView; } private class CountryFilter extends Filter { @Override protected FilterResults performFiltering(CharSequence constraint) { constraint = constraint.toString().toLowerCase(); FilterResults result = new FilterResults(); if(constraint != null && constraint.toString().length() > 0) { ArrayList filteredItems = new ArrayList(); for(int i = 0, l = originalList.size(); i < l; i++) { Country country = originalList.get(i); if(country.toString().toLowerCase().contains(constraint)) filteredItems.add(country); } result.count = filteredItems.size(); result.values = filteredItems; } else { synchronized(this) { result.values = originalList; result.count = originalList.size(); } } return result; } @SuppressWarnings("unchecked") @Override protected void publishResults(CharSequence constraint, FilterResults results) { countryList = (ArrayList)results.values; notifyDataSetChanged(); clear(); for(int i = 0, l = countryList.size(); i < l; i++) add(countryList.get(i)); notifyDataSetInvalidated(); } } } }

Source for POJO - Country.java

package com.as400samplecode; public class Country { String code = null; String name = null; String continent = null; String region = null; public Country(String code, String name, String continent, String region) { super(); this.code = code; this.name = name; this.continent = continent; this.region = region; } public String getCode() { return code; } public void setCode(String code) { this.code = code; } public String getName() { return name; } public void setName(String name) { this.name = name; } public String getContinent() { return continent; } public void setContinent(String continent) { this.continent = continent; } public String getRegion() { return region; } public void setRegion(String region) { this.region = region; } @Override public String toString() { return code + " " + name + " " + continent + " " + region; } }

Source for Main Screen Layout - main.xml

Source for Custom List Layout - country_info.xml

Source for application variables - strings.xml

Android ListView Display and Filter some North American Countries! Type here to filter…

Source for application manifest - AndroidManifest.xml

References

• Android ListView API Doc
• Android LayoutInflator API Doc
• Android TextWatcher API Doc