SEARCH FILTER

rom Google Material Design documentation.

The app bar can act as a text input field. As the user types, the content underneath is filtered and sorted.

HOW TO ADD?

I. In your build.gradle add latest appcompat library.

dependencies {  
    compile 'com.android.support:appcompat-v7:X.X.X' // where X.X.X version
}

II. Create a searchable configuration in a searchable.xml saved in res/xmldirectory.

<?xml version="1.0" encoding="utf-8"?>  
<searchable xmlns:android="http://schemas.android.com/apk/res/android"  
    android:label="@string/app_label"
    android:hint="@string/search_hint" >
</searchable>

III. Declare your searchable activity in the AndroidManifest.xml file.

<activity android:name=".SearchActivity">  
    <intent-filter>
        <action android:name="android.intent.action.SEARCH" />
    </intent-filter>
    <meta-data android:name="android.app.searchable"
               android:resource="@xml/searchable"/>
</activity>

IV. Declare your SearchView inside any layout.xml.

<android.support.v7.widget.SearchView  
    android:id="@+id/search"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"/>

V. Setup your SearchView on your Activity's onCreate method.

SearchView searchView = (SearchView) findViewById(R.id.search);  
// Sets searchable configuration defined in searchable.xml for this SearchView
SearchManager searchManager =  
        (SearchManager) getSystemService(Context.SEARCH_SERVICE);
searchView.setSearchableInfo(searchManager.getSearchableInfo(getComponentName()));

VI. Receive a search query.

// When a user executes a search the system starts your searchable activity and sends it a ACTION_SEARCH intent

Intent intent = getIntent();  
if (Intent.ACTION_SEARCH.equals(intent.getAction())) {  
  String query = intent.getStringExtra(SearchManager.QUERY);
  doMySearch(query);
}