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Search Functionality Using SearchView In Android

What Is SearchView?

Example

1. Add a listbox in layout file. The purpose of this listbox is to display the list of items.

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
	xmlns:android="http://schemas.android.com/apk/res/android"
	xmlns:app="http://schemas.android.com/apk/res-auto"
	xmlns:tools="http://schemas.android.com/tools"    
                  android:layout_width="match_parent"    
                  android:layout_height="match_parent"    
                  tools:context=".debug.Demo">
	<ListView android:id="@+id/lView"        
                            android:layout_width="match_parent"   
                            android:layout_height="match_parent" />
</androidx.constraintlayout.widget.ConstraintLayout>




2. Add a menu folder. For that
   1. Right-click on res folder
   2. Go to New → Android Resource Directory
   
   Click to Enlarge
   
   
   3. A popup will appear, where we can select a folder of type menu
   
   Click to Enlarge
   4. Once you click on Ok, a menu folder is created inside the res folder.
   
   Click to Enlarge
3. Add a resource file in the menu folder. For that
   1. Right-click on menu folder.
   2. Click on New → Menu Resource File.
   
   Click to Enlarge
   
   
   3. A pop up window will appear where you can give the file name and click on Ok.
   
   Click to Enlarge
4. Add code in search_option.xml.

<?xml version="1.0" encoding="utf-8"?>
<menu
	xmlns:android="http://schemas.android.com/apk/res/android"
	xmlns:app="http://schemas.android.com/apk/res-auto">
	<item android:id="@+id/search" android:title="Search"    app:showAsAction="always"    
        app:actionViewClass="android.widget.SearchView" />
</menu>




5. Add a code on onCreate method to bind listbox with data source.

String fruitlist[] = {
  "apple",
  "banana",
  "orange",
  "cherry"
};
ListView listView = (ListView) findViewById(R.id.lView);
adapter = new ArrayAdapter < String > (this, R.layout.support_simple_spinner_dropdown_item, fruitlist);
listView.setAdapter(adapter);




6. Override onCreateOptionsMenu and add a code to filter data

@Override
public boolean onCreateOptionsMenu(Menu menu) {
  MenuInflater inflater = getMenuInflater();
  inflater.inflate(R.menu.search_option, menu);
  MenuItem item = menu.findItem(R.id.search);

  SearchView searchView = (SearchView) item.getActionView();
  searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
    @Override
    public boolean onQueryTextSubmit(String s) {
      return false;
    }

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

Output